IP Network - NGAP

 

 

 

NGAP is the protocol(an Application Layer Protocol) being used in the communication between between gNB and AMF as illustrated below.

 

 

 

What I am going to do in this note is to provide details of NG Interface and NGAP (Protocol for NG Interface). Followings are the list of the topics on this note.

 

 

 

Overall Protocol Stack

 

Structure of the protocol stack for this interface is illustrated as below.  Overall description and requirement of NGAP specified in 38.412 (very short specification). Since NGAP packet is encapsulated by IP and SCTP which are more of generic purpose (i.e, not 3GPP only), further details are specified in various RFC documents (Refer to 38.412 to know which RFC document you have to refer to). For the details of signaling procedure over NGAP, refer to 38.413.

 

 

 

 

General Principles of NG Interface

 

General principles of NG Interface is described in 38.410 - 4.2 as follows :

  • the NG interface is open;
  • the NG interface supports the exchange of signalling information between the NG-RAN and 5GC;
  • from a logical standpoint, the NG is a point-to-point interface between an NG-RAN node and a 5GC node. A point-to-point logical interface is feasible even in the absence of a physical direct connection between the NGRAN and 5GC;
  • the NG interface supports control plane and user plane separation;
  • the NG interface separates Radio Network Layer and Transport Network Layer;
  • the NG interface is future proof to fulfil different new requirements and support of new services and new functions;
  • the NG interface is decoupled with the possible NG-RAN deployment variants;
  • the NG Application Protocol supports modular procedures design and uses a syntax allowing optimized encoding /decoding efficiency.

 

 

 

NGAP Capabilities

 

According to 38.410-4.4, NGAP support following capabilities :

  • procedures to establish, maintain and release NG-RAN part of PDU sessions;
  • procedures to perform intra-RAT handover and inter-RAT handover;
  • the separation of each UE on the protocol level for user specific signalling management;
  • the transfer of NAS signalling messages between UE and AMF;
  • mechanisms for resource reservation for packet data streams.

 

 

 

NGAP Elementary Procedure

 

Followings are the list of signaling messages (Elementary Procedure) of NGAP. There are two types of elementary procedure classified into Class 1 and Class 2. The definition of Class 1 and Class 2 is stated in 38.413 - 3.1 as follows :

  • Class 1: Elementary Procedures with response (success and/or failure).
  • Class 2: Elementary Procedures without response.

 

The list of NGAP Elementary procedure and corresponding signaling message is defined in 38.413-8.1 as follows.

 

< 38.413 v16.7- Table 8.1-1: Class 1 procedures >

Elementary Procedure

Initiating Message

Successful Outcome

Unsuccessful Outcome

Examples

Response Message

Response Message

AMF Configuration Update

AMF CONFIGURATION

UPDATE

AMF CONFIGURATION

UPDATE

ACKNOWLEDGE

AMF CONFIGURATION

UPDATE FAILURE

 

RAN Configuration Update

RAN CONFIGURATION

UPDATE

RAN CONFIGURATION

UPDATE

ACKNOWLEDGE

RAN CONFIGURATION

UPDATE FAILURE

 

Handover Cancellation

HANDOVER CANCEL

HANDOVER CANCEL

ACKNOWLEDGE

 

 

Handover Preparation

HANDOVER REQUIRED

HANDOVER COMMAND

HANDOVER

PREPARATION FAILURE

 

Handover Resource Allocation

HANDOVER REQUEST

HANDOVER REQUEST

ACKNOWLEDGE

HANDOVER FAILURE

 

Initial Context Setup

INITIAL CONTEXT

SETUP REQUEST

INITIAL CONTEXT SETUP RESPONSE

INITIAL CONTEXT SETUP

FAILURE

 

NG Reset

NG RESET

NG RESET

ACKNOWLEDGE

 

 

NG Setup

NG SETUP REQUEST

NG SETUP RESPONSE

NG SETUP FAILURE

 

Path Switch Request

PATH SWITCH

REQUEST

PATH SWITCH REQUEST

ACKNOWLEDGE

PATH SWITCH REQUEST

FAILURE

 

PDU Session Resource Modify

PDU SESSION

RESOURCE MODIFY

REQUEST

PDU SESSION

RESOURCE MODIFY

RESPONSE

 

 

PDU Session Resource Modify Indication

PDU SESSION

RESOURCE MODIFY

INDICATION

PDU SESSION

RESOURCE MODIFY

CONFIRM

 

 

PDU Session Resource Release

PDU SESSION

RESOURCE RELEASE

COMMAND

PDU SESSION

RESOURCE RELEASE

RESPONSE

 

 

PDU Session Resource Setup

PDU SESSION

RESOURCE SETUP

REQUEST

PDU SESSION

RESOURCE SETUP

RESPONSE

 

 

UE Context Modification

UE CONTEXT

MODIFICATION

REQUEST

UE CONTEXT

MODIFICATION

RESPONSE

UE CONTEXT

MODIFICATION FAILURE

 

UE Context Release

UE CONTEXT

RELEASE COMMAND

UE CONTEXT RELEASE

COMPLETE

 

 

Write-Replace Warning

WRITE-REPLACE

WARNING REQUEST

WRITE-REPLACE

WARNING RESPONSE

 

 

PWS Cancel

PWS CANCEL

REQUEST

PWS CANCEL

RESPONSE

 

 

UE Radio Capability

Check

UE RADIO

CAPABILITY CHECK

REQUEST

UE RADIO CAPABILITY

CHECK RESPONSE

 

 

UE Context Suspend

UE CONTEXT

SUSPEND REQUEST

UE CONTEXT SUSPEND

RESPONSE

UE CONTEXT SUSPEND

FAILURE

 

UE Context Resume

UE CONTEXT

RESUME REQUEST

UE CONTEXT RESUME

RESPONSE

UE CONTEXT RESUME

FAILURE

 

UE Radio Capability ID

Mapping

UE RADIO

CAPABILITY ID

MAPPING REQUEST

UE RADIO CAPABILITY

ID MAPPING RESPONSE

 

 

 

 

< 38.413 - v16.7 :Table 8.1-2: Class 2 procedures  >

Elementary Procedure

Message

Examples

Downlink RAN Configuration Transfer

DOWNLINK RAN CONFIGURATION TRANSFER

 

Downlink RAN Status Transfer

DOWNLINK RAN STATUS TRANSFER

 

Downlink NAS Transport

DOWNLINK NAS TRANSPORT

 

Error Indication

ERROR INDICATION

 

Uplink RAN Configuration Transfer

UPLINK RAN CONFIGURATION TRANSFER

 

Uplink RAN Status Transfer

UPLINK RAN STATUS TRANSFER

 

Handover Notification

HANDOVER NOTIFY

 

Initial UE Message

INITIAL UE MESSAGE

 

NAS Non Delivery Indication

NAS NON DELIVERY INDICATION

 

Paging

PAGING

 

PDU Session Resource Notify

PDU SESSION RESOURCE NOTIFY

 

Reroute NAS Request

REROUTE NAS REQUEST

 

UE Context Release Request

UE CONTEXT RELEASE REQUEST

 

Uplink NAS Transport

UPLINK NAS TRANSPORT

 

AMF Status Indication

AMF STATUS INDICATION

 

PWS Restart Indication

PWS RESTART INDICATION

 

PWS Failure Indication

PWS FAILURE INDICATION

 

Downlink UE Associated NRPPa Transport

DOWNLINK UE ASSOCIATED NRPPA TRANSPORT

 

Uplink UE Associated NRPPa Transport

UPLINK UE ASSOCIATED NRPPA TRANSPORT

 

Downlink Non UE Associated NRPPa Transport

DOWNLINK NON UE ASSOCIATED NRPPA TRANSPORT

 

Uplink Non UE Associated NRPPa Transport

UPLINK NON UE ASSOCIATED NRPPA TRANSPORT

 

Trace Start

TRACE START

 

Trace Failure Indication

TRACE FAILURE INDICATION

 

Deactivate Trace

DEACTIVATE TRACE

 

Cell Traffic Trace

CELL TRAFFIC TRACE

 

Location Reporting Control

LOCATION REPORTING CONTROL

 

Location Reporting Failure Indication

LOCATION REPORTING FAILURE INDICATION

 

Location Report

LOCATION REPORT

 

UE TNLA Binding Release

UE TNLA BINDING RELEASE REQUEST

 

UE Radio Capability Info Indication

UE RADIO CAPABILITY INFO INDICATION

 

RRC Inactive Transition Report

RRC INACTIVE TRANSITION REPORT

 

Overload Start

OVERLOAD START

 

Overload Stop

OVERLOAD STOP

 

Secondary RAT Data Usage Report

SECONDARY RAT DATA USAGE REPORT

 

Uplink RIM Information Transfer

UPLINK RIM INFORMATION TRANSFER

 

Downlink RIM Information Transfer

DOWNLINK RIM INFORMATION TRANSFER

 

Retrieve UE Information

RETRIEVE UE INFORMATION

 

UE Information Transfer

UE INFORMATION TRANSFER

 

RAN CP Relocation Indication

RAN CP RELOCATION INDICATION

 

Connection Establishment Indication

CONNECTION ESTABLISHMENT INDICATION

 

AMF CP Relocation Indication

AMF CP RELOCATION INDICATION

 

Handover Success

HANDOVER SUCCESS

 

Uplink RAN Early Status Transfer

UPLINK RAN EARLY STATUS TRANSFER

 

Downlink RAN Early Status Transfer

DOWNLINK RAN EARLY STATUS TRANSFER

 

 

 

 

NGAP Packet Structure

 

If you take packet capture (e.g, Wireshark capture) over the interface, you would get the packet structure as below.

 

 

 

Following is SCTP initial setup process captured with Wireshark from Amarisoft Callbox. (a),(b),(c),(d) is the initial setup of SCTP which is explained in this note , the procedure (1)~(13) is the procedure that will be described in this note.

 

 

 

 

NGAP Establish

 

This procedure is to establish the signaling connection between gNB and AMF (i.e, the first connection process). This is not UE specific and this will apply to every UE that are connected to the specified AMF. This process is specified in 38.413-8.7.1. The overall procedure is simple two way handshaking as illustrated below.

 

< 38.413-Figure 8.7.1.2-1: NG setup: successful operation >

 

For the description of some important IEs in NG SETUP REQUEST and NG SETUP RESPONSE message, refer to 38.413-8.7.1.2. I think it is relatively clearly described in this specification. The IEs with the description as per 38.413 v16.7 is listed as below. Most of these IEs are optional, so you may not see all of these IEs configured in NGAP log.

  • NGSetupRequest
    • Configured TAC Indication
    • UE Retention Information
  • NGSetupResponse
    • IAB Supported
    • Backup AMF Name
    • GUAMI Type
    • RAN Node Name
    • Extended RAN Node Name
    • NB-IoT Default Paging DRX
    • RAT Information
    • Broadcast PLMN Item->NPN Support->NID
    • PLMN Support Item->NPN Support->NID

In most cases, AMF accept NGSetupRequest from gNB and send NGSetupReponse, but if any of the following IE does not match with what AMF expects, it would refuse the connection.

  • pLMNIdentity
  • tAC

NOTE : It seems that different AMF applies a little bit of different rules for accepting the SETUP REQUEST. For example, Amarisoft AMF is checking only on pLMNIdentity but free5GC AMF seems to check both pLMNIdentity and tAC.

 

Following is the message structure and requirement of NG SETUP REQUEST from 48.413-9.2.6.1

 

 

 

Following is the message structure and requirement of NG SETUP RESPONSE from 48.413-9.2.6.2

 

 

 

Followings are statements from 38.413-8.7.1.2 that are related to processing the information elements in NG SETUP REQUEST message.

  • If the Configured TAC Indication IE set to "true” is included for a Tracking Area contained in the Supported TA List IE in the NG SETUP REQUEST message, the AMF may take it into account to optimise NG-C signalling towards this NG-RAN node.
  • If the UE Retention Information IE set to “ues-retained“ is included in the NG SETUP REQUEST message, the AMF may accept the proposal to retain the existing UE related contexts and signalling connections by including the UE Retention Information IE set to “ues-retained“ in the NG SETUP RESPONSE message.
  • If the RAN Node Name IE is included in the NG SETUP REQUEST message, the AMF may use this IE as a human readable name of the NG-RAN node. If the Extended RAN Node Name IE is included in the NG SETUP REQUEST message, the AMF may use this IE as a human readable name of the NG-RAN node and shall ignore the RAN Node Name IE if also included.
  • If the NB-IoT Default Paging DRX IE is included in the NG SETUP REQUEST message, the AMF shall take it into account for paging.
  • If the RAT Information IE is included in the NG SETUP REQUEST message, the AMF shall handle this information as specified in TS 23.502.
  • If the NID IE within the NPN Support IE is included within a Broadcast PLMN Item IE in the NG SETUP REQUEST message, the AMF shall consider that the NG-RAN node supports the indicated S-NSSAI(s) for the corresponding tracking area code for the SNPN identified by the PLMN Identity IE and the NID IE.

 

Followings are statements from 38.413-8.7.1.2 that are related to processing the information elements in NG SETUP RESPONSE message.

  • If the UE Retention Information IE set to ́ues-retained́ is included in the NG SETUP REQUEST message, the AMF may accept the proposal to retain the existing UE related contexts and signalling connections by including the UE Retention Information IE set to ́ues-retained́ in the NG SETUP RESPONSE message.
  • If the AMF supports IAB, the AMF shall include the IAB Supported IE in the NG SETUP RESPONSE message.
  • The AMF shall include the Backup AMF Name IE, if available, in the Served GUAMI List IE in the NG SETUP RESPONSE message. The NG-RAN node shall, if supported, consider the AMF as indicated by the Backup AMF Name IE when performing AMF reselection, as specified in TS 23.501.
  • If the GUAMI Type IE is included in the NG SETUP RESPONSE message, the NG-RAN node shall store the received value and use it for further AMF selection as defined in TS 23.501.
  • If the AMF Name IE is included in the NG SETUP RESPONSE message, the NG-RAN node may use this IE as a human readable name of the AMF. If the Extended AMF Name IE is included in the NG SETUP RESPONSE message, the NG-RAN node may use this IE as a human readable name of the AMF and shall ignore the AMF Name IE if also included.
  • If the NID IE within the NPN Support IE is included within a PLMN Support Item IE in the NG SETUP RESPONSE message, the NG-RAN node shall consider that the AMF supports the SNPN identified by the PLMN Identity IE and the NID IE.

 

 

(1) NG Setup Request

 

Internet Protocol Version 4, Src: 10.0.0.185, Dst: 10.0.0.162

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 108

    Identification: 0x0001 (1)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x24b1 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.185

    Destination Address: 10.0.0.162

Stream Control Transmission Protocol, Src Port: 48041 (48041), Dst Port: 38412 (38412)

    Source port: 48041

    Destination port: 38412

    Verification tag: 0x790ad620

    [Association index: 65535]

    Checksum: 0x3dba6023 [unverified]

    [Checksum Status: Unverified]

    DATA chunk(ordered, complete segment, TSN: 3757580128, SID: 0, SSN: 0, PPID: 60,

             payload length: 58 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 74

        Transmission sequence number: 3757580128

            [This chunk is acked in frame: 138]

                [The RTT to SACK was: 0.000032008 seconds]

        Stream identifier: 0x0000

        Stream sequence number: 0

        Payload protocol identifier: NGAP (60)

        Chunk padding: 0000

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-NGSetup (21)

            criticality: reject (0)

            value

                NGSetupRequest

                    protocolIEs: 4 items

                        Item 0: id-GlobalRANNodeID

                            ProtocolIE-Field

                                id: id-GlobalRANNodeID (27)

                                criticality: reject (0)

                                value

                                    GlobalRANNodeID: globalGNB-ID (0)

                                        globalGNB-ID

                                            pLMNIdentity: 00f110

                                                Mobile Country Code (MCC): Unknown (1)

                                                Mobile Network Code (MNC): Unknown (01)

                                            gNB-ID: gNB-ID (0)

                                                gNB-ID: 00123450 [bit length 28, 4 LSB pad bits,

                                                        ....]

                        Item 1: id-RANNodeName

                            ProtocolIE-Field

                                id: id-RANNodeName (82)

                                criticality: ignore (1)

                                value

                                    RANNodeName: gnb0012345

                        Item 2: id-SupportedTAList

                            ProtocolIE-Field

                                id: id-SupportedTAList (102)

                                criticality: reject (0)

                                value

                                    SupportedTAList: 1 item

                                        Item 0

                                            SupportedTAItem

                                                tAC: 100 (0x000064)

                                                broadcastPLMNList: 1 item

                                                    Item 0

                                                        BroadcastPLMNItem

                                                            pLMNIdentity: 00f110

                                                                Mobile Country Code (MCC):

                                                                                   Unknown (1)

                                                                Mobile Network Code (MNC):

                                                                                   Unknown (01)

                                                            tAISliceSupportList: 1 item

                                                                Item 0

                                                                    SliceSupportItem

                                                                        s-NSSAI

                                                                            sST: 01

                        Item 3: id-DefaultPagingDRX

                            ProtocolIE-Field

                                id: id-DefaultPagingDRX (21)

                                criticality: ignore (1)

                                value

                                    PagingDRX: v128 (2)

 

 

(2) NG Setup Response

 

Internet Protocol Version 4, Src: 10.0.0.162, Dst: 10.0.0.185

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 140

    Identification: 0xadd1 (44497)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x76c0 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.162

    Destination Address: 10.0.0.185

Stream Control Transmission Protocol, Src Port: 38412 (38412), Dst Port: 48041 (48041)

    Source port: 38412

    Destination port: 48041

    Verification tag: 0x8d10a6cf

    [Association index: 65535]

    Checksum: 0x5a3ac41a [unverified]

    [Checksum Status: Unverified]

    DATA chunk(ordered, complete segment, TSN: 4169966867, SID: 0, SSN: 0, PPID: 60,

                                          payload length: 89 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 105

        Transmission sequence number: 4169966867

            [This chunk is acked in frame: 140]

                [The RTT to SACK was: 0.004556150 seconds]

        Stream identifier: 0x0000

        Stream sequence number: 0

        Payload protocol identifier: NGAP (60)

        Chunk padding: 000000

NG Application Protocol

    NGAP-PDU: successfulOutcome (1)

        successfulOutcome

            procedureCode: id-NGSetup (21)

            criticality: reject (0)

            value

                NGSetupResponse

                    protocolIEs: 4 items

                        Item 0: id-AMFName

                            ProtocolIE-Field

                                id: id-AMFName (1)

                                criticality: reject (0)

                                value

                                    AMFName: amarisoft.amf.5gc.mnc001.mcc001.3gppnetwork.org

                        Item 1: id-ServedGUAMIList

                            ProtocolIE-Field

                                id: id-ServedGUAMIList (96)

                                criticality: reject (0)

                                value

                                    ServedGUAMIList: 1 item

                                        Item 0

                                            ServedGUAMIItem

                                                gUAMI

                                                    pLMNIdentity: 00f110

                                                        Mobile Country Code (MCC): Unknown (1)

                                                        Mobile Network Code (MNC): Unknown (01)

                                                    aMFRegionID: 80 [bit length 8,

                                                        1000 0000 decimal value 128]

                                                    aMFSetID: 0100 [bit length 10,

                                                        6 LSB pad bits, 0000 0001  00.. ....

                                                        decimal value 4]

                                                    aMFPointer: 04 [bit length 6, 2 LSB pad bits,

                                                        0000 01.. decimal value 1]

                        Item 2: id-RelativeAMFCapacity

                            ProtocolIE-Field

                                id: id-RelativeAMFCapacity (86)

                                criticality: ignore (1)

                                value

                                    RelativeAMFCapacity: 50

                        Item 3: id-PLMNSupportList

                            ProtocolIE-Field

                                id: id-PLMNSupportList (80)

                                criticality: reject (0)

                                value

                                    PLMNSupportList: 1 item

                                        Item 0

                                            PLMNSupportItem

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                sliceSupportList: 1 item

                                                    Item 0

                                                        SliceSupportItem

                                                            s-NSSAI

                                                                sST: 01

 

 

 

NR SA Registration

 

The Initial UE Message procedure is used when the NG-RAN node has received from the radio interface the first uplink NAS message to be forwarded to an AMF.

 

< 38.413-Figure 8.6.1.2-1: Initial UE message >

 

 

Following is from 38.413 - 9.2.5.1 about the message structure and requirement for INITIAL UE MESSAGE.

 

 

 

Followings are statements from 38.413-8.6.1.2 that are related to processing the information elements in this message.

  • The NG-RAN node initiates the procedure by sending an INITIAL UE MESSAGE message to the AMF. The NG-RAN node shall allocate a unique RAN UE NGAP ID to be used for the UE and the NG-RAN node shall include this identity in the INITIAL UE MESSAGE message.
  • The NAS-PDU IE contains a UE – AMF message that is transferred without interpretation in the NG-RAN node.
  • In case of network sharing, the selected PLMN is indicated by the PLMN Identity IE within the TAI IE included in the INITIAL UE MESSAGE message.
  • When the NG-RAN node has received from the radio interface the 5G-S-TMSI IE, it shall include it in the INITIAL UE MESSAGE message.
  • If the AMF Set ID IE is included in the INITIAL UE MESSAGE message this indicates that the message is a rerouted message and the AMF shall, if supported, use the IE as described in TS 23.502.
  • If the UE Context Request IE is included in the INITIAL UE MESSAGE message the AMF shall trigger an Initial Context Setup procedure towards the NG-RAN node.
  • If the Allowed NSSAI IE is included in the INITIAL UE MESSAGE message the AMF shall use the IE as defined in TS 23.502.
  • If the Source to Target AMF Information Reroute IE is included in the INITIAL UE MESSAGE message the AMF shall use the IE as defined in TS 23.502.
  • If the IAB Node Indication IE is included in the INITIAL UE MESSAGE message, the AMF shall consider that the message is related to an IAB node.
  • If the CE-mode-B Support Indicator IE is included in the INITIAL UE MESSAGE message and set to "supported", the AMF shall, if supported, use the extended NAS timer settings for the UE as specified in TS 23.501.
  • If the LTE-M indication IE is included in the INITIAL UE MESSAGE message the AMF shall, if supported, use it according to TS 23.501.
  • If the EDT Session IE set to "true" is included in the INITIAL UE MESSAGE message and the NG-RAN node is an ngeNB,the AMF shall, if supported, consider that the message has been received as a result of an EDT session initiated by the UE.
  • If PNI-NPN related information within the NPN Access Information IE is received in the INITIAL UE MESSAGE message, the AMF shall, if supported, consider that the included information is associated to the cell via which the UE has sent the first NAS message, and to the PLMN Identity which is indicated within the TAI IE, and use the included information as specified in TS 23.501.
  • In case of network sharing for SNPNs, the selected SNPN is indicated within the User Location Information IE included in the INITIAL UE MESSAGE message by the PLMN Identity IE within the TAI IE and the NID IE.

 

 

(3) InitialUEMessage

 

Internet Protocol Version 4, Src: 10.0.0.185, Dst: 10.0.0.162

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 188

    Identification: 0x0009 (9)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x2459 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.185

    Destination Address: 10.0.0.162

Stream Control Transmission Protocol, Src Port: 48041 (48041), Dst Port: 38412 (38412)

    Source port: 48041

    Destination port: 38412

    Verification tag: 0x790ad620

    [Association index: 65535]

    Checksum: 0xdd43ee10 [unverified]

    [Checksum Status: Unverified]

    DATA chunk(ordered, complete segment, TSN: 3757580129, SID: 1, SSN: 0, PPID: 60,

              payload length: 137 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 153

        Transmission sequence number: 3757580129

            [This chunk is acked in frame: 886]

                [The RTT to SACK was: 0.000119970 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 0

        Payload protocol identifier: NGAP (60)

        Chunk padding: 000000

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-InitialUEMessage (15)

            criticality: ignore (1)

            value

                InitialUEMessage

                    protocolIEs: 5 items

                        Item 0: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 1: id-NAS-PDU

                            ProtocolIE-Field

                                id: id-NAS-PDU (38)

                                criticality: reject (0)

                                value

                                    NAS-PDU: 7e017d335df8077e004109000bf200f110...…

                                        Non-Access-Stratum 5GS (NAS)PDU

                                            Security protected NAS 5GS message

                                                Extended protocol discriminator:

                                                         5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0001 = Security header type:

                                                         Integrity protected (1)

                                                Message authentication code: 0x7d335df8

                                                Sequence number: 7

                                            Plain NAS 5GS Message

                                                Extended protocol discriminator:

                                                         5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0000 = Security header type:

                                                    Plain NAS message, not security protected (0)

                                                Message type: Registration request (0x41)

                                                5GS registration type

                                                    .... 1... = Follow-On Request bit (FOR):

                                                                        Follow-on request pending

                                                    .... .001 = 5GS registration type:

                                                                        initial registration (1)

                                                NAS key set identifier

                                                    0... .... = Type of security context flag(TSC):

                                                            Native security context (for KSIAMF)

                                                    .000 .... = NAS key set identifier: 0

                                                5GS mobile identity

                                                    Length: 11

                                                    .... 0... = Odd/even indication:

                                                            Even number of identity digits

                                                    .... .010 = Type of identity: 5G-GUTI (2)

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                    AMF Region ID: 128

                                                    0000 0001 00.. .... = AMF Set ID: 4

                                                    ..00 0001 = AMF Pointer: 1

                                                    5G-TMSI: 3776478432 (0xe1187ce0)

                                                UE security capability

                                                    Element ID: 0x2e

                                                    Length: 4

                                                    1... .... = 5G-EA0: Supported

                                                    .1.. .... = 128-5G-EA1: Supported

                                                    ..1. .... = 128-5G-EA2: Supported

                                                    ...1 .... = 128-5G-EA3: Supported

                                                    .... 0... = 5G-EA4: Not supported

                                                    .... .0.. = 5G-EA5: Not supported

                                                    .... ..0. = 5G-EA6: Not supported

                                                    .... ...0 = 5G-EA7: Not supported

                                                    0... .... = 5G-IA0: Not supported

                                                    .1.. .... = 128-5G-IA1: Supported

                                                    ..1. .... = 128-5G-IA2: Supported

                                                    ...1 .... = 128-5G-IA3: Supported

                                                    .... 0... = 5G-IA4: Not supported

                                                    .... .0.. = 5G-IA5: Not supported

                                                    .... ..0. = 5G-IA6: Not supported

                                                    .... ...0 = 5G-IA7: Not supported

                                                    1... .... = EEA0: Supported

                                                    .1.. .... = 128-EEA1: Supported

                                                    ..1. .... = 128-EEA2: Supported

                                                    ...1 .... = 128-EEA3: Supported

                                                    .... 0... = EEA4: Not supported

                                                    .... .0.. = EEA5: Not supported

                                                    .... ..0. = EEA6: Not supported

                                                    .... ...0 = EEA7: Not supported

                                                    0... .... = EIA0: Not supported

                                                    .1.. .... = 128-EIA1: Supported

                                                    ..1. .... = 128-EIA2: Supported

                                                    ...1 .... = 128-EIA3: Supported

                                                    .... 0... = EIA4: Not supported

                                                    .... .0.. = EIA5: Not supported

                                                    .... ..0. = EIA6: Not supported

                                                    .... ...0 = EIA7: Not supported

                                                NAS message container

                                                    Element ID: 0x71

                                                    Length: 56

                                                    Non-Access-Stratum 5GS (NAS)PDU

                                                        Plain NAS 5GS Message

                                                            Extended protocol discriminator:

                                                              5G mobility management messages (126)

                                                            0000 .... = Spare Half Octet: 0

                                                            .... 0000 = Security header type:

                                                               Plain NAS message,

                                                               not security protected (0)

                                                            Message type:

                                                               Registration request (0x41)

                                                            5GS registration type

                                                                .... 1... = Follow-On Request bit

                                                                   (FOR): Follow-on request pending

                                                                .... .001 = 5GS registration type:

                                                                   initial registration (1)

                                                            NAS key set identifier

                                                                0... .... =

                                                                 Type of security context flag(TSC)

                                                                 : Native security context

                                                                   (for KSIAMF)

                                                                .000 ....=NAS key set identifier:0

                                                            5GS mobile identity

                                                                Length: 11

                                                                .... 0... = Odd/even indication:

                                                                    Even number of identity digits

                                                                .... .010 = Type of identity:

                                                                    5G-GUTI (2)

                                                                Mobile Country Code (MCC):

                                                                    Unknown (1)

                                                                Mobile Network Code (MNC):

                                                                    Unknown (01)

                                                                AMF Region ID: 128

                                                                0000 0001 00.. .... = AMF Set ID: 4

                                                                ..00 0001 = AMF Pointer: 1

                                                                5G-TMSI: 3776478432 (0xe1187ce0)

                                                            5GMM capability

                                                                Element ID: 0x10

                                                                Length: 1

                                                                0... .... = Spare: 0

                                                                .0.. .... = Spare: 0

                                                                ..0. .... = Spare: 0

                                                                ...0 .... = Spare: 0

                                                                .... 0... = Spare: 0

                                                                .... .0.. = LTE PositioningProtocol

                                                                    (LPP) capability: Not Requested

                                                                .... ..1. = HO attach: Supported

                                                                .... ...1 = S1 mode: Requested

                                                            UE security capability

                                                                Element ID: 0x2e

                                                                Length: 4

                                                                1... .... = 5G-EA0: Supported

                                                                .1.. .... = 128-5G-EA1: Supported

                                                                ..1. .... = 128-5G-EA2: Supported

                                                                ...1 .... = 128-5G-EA3: Supported

                                                                .... 0... = 5G-EA4: Not supported

                                                                .... .0.. = 5G-EA5: Not supported

                                                                .... ..0. = 5G-EA6: Not supported

                                                                .... ...0 = 5G-EA7: Not supported

                                                                0... .... = 5G-IA0: Not supported

                                                                .1.. .... = 128-5G-IA1: Supported

                                                                ..1. .... = 128-5G-IA2: Supported

                                                                ...1 .... = 128-5G-IA3: Supported

                                                                .... 0... = 5G-IA4: Not supported

                                                                .... .0.. = 5G-IA5: Not supported

                                                                .... ..0. = 5G-IA6: Not supported

                                                                .... ...0 = 5G-IA7: Not supported

                                                                1... .... = EEA0: Supported

                                                                .1.. .... = 128-EEA1: Supported

                                                                ..1. .... = 128-EEA2: Supported

                                                                ...1 .... = 128-EEA3: Supported

                                                                .... 0... = EEA4: Not supported

                                                                .... .0.. = EEA5: Not supported

                                                                .... ..0. = EEA6: Not supported

                                                                .... ...0 = EEA7: Not supported

                                                                0... .... = EIA0: Not supported

                                                                .1.. .... = 128-EIA1: Supported

                                                                ..1. .... = 128-EIA2: Supported

                                                                ...1 .... = 128-EIA3: Supported

                                                                .... 0... = EIA4: Not supported

                                                                .... .0.. = EIA5: Not supported

                                                                .... ..0. = EIA6: Not supported

                                                                .... ...0 = EIA7: Not supported

                                                            NSSAI - Requested NSSAI

                                                                Element ID: 0x2f

                                                                Length: 2

                                                                S-NSSAI 1

                                                                    Length: 1

                                                                    Slice/service type (SST): 1

                                                            5GS tracking area identity -

                                                                       Last visited registered TAI

                                                                Element ID: 0x52

                                                                Mobile Country Code (MCC):

                                                                       Unknown (1)

                                                                Mobile Network Code (MNC):

                                                                       Unknown (01)

                                                                TAC: 100

                                                            UE network capability

                                                                Element ID: 0x17

                                                                Length: 7

                                                                1... .... = EEA0: Supported

                                                                .1.. .... = 128-EEA1: Supported

                                                                ..1. .... = 128-EEA2: Supported

                                                                ...1 .... = 128-EEA3: Supported

                                                                .... 0... = EEA4: Not supported

                                                                .... .0.. = EEA5: Not supported

                                                                .... ..0. = EEA6: Not supported

                                                                .... ...0 = EEA7: Not supported

                                                                0... .... = EIA0: Not supported

                                                                .1.. .... = 128-EIA1: Supported

                                                                ..1. .... = 128-EIA2: Supported

                                                                ...1 .... = 128-EIA3: Supported

                                                                .... 0... = EIA4: Not supported

                                                                .... .0.. = EIA5: Not supported

                                                                .... ..0. = EIA6: Not supported

                                                                .... ...0 = EIA7: Not supported

                                                                1... .... = UEA0: Supported

                                                                .1.. .... = UEA1: Supported

                                                                ..0. .... = UEA2: Not supported

                                                                ...0 .... = UEA3: Not supported

                                                                .... 0... = UEA4: Not supported

                                                                .... .0.. = UEA5: Not supported

                                                                .... ..0. = UEA6: Not supported

                                                                .... ...0 = UEA7: Not supported

                                                                0... .... = UCS2 support (UCS2):

                                                                      The UE has a preference

                                                                      for the default alphabet

                                                                .1.. .... = UIA1: Supported

                                                                ..0. .... = UIA2: Not supported

                                                                ...0 .... = UIA3: Not supported

                                                                .... 0... = UIA4: Not supported

                                                                .... .0.. = UIA5: Not supported

                                                                .... ..0. = UIA6: Not supported

                                                                .... ...0 = UIA7: Not supported

                                                                0... .... = ProSe direct discovery:

                                                                            Not supported

                                                                .0.. .... = ProSe: Not supported

                                                                ..0. .... = H.245 After SRVCC

                                                                            Handover: Not supported

                                                                ...1 .... = Access class control

                                                                            for CSFB: Supported

                                                                .... 1... = LTE Positioning

                                                                            Protocol: Supported

                                                                .... .0.. = Location services (LCS)

                                                                         notification mechanisms:

                                                                         Not supported

                                                                .... ..0. = SRVCC from E-UTRAN to

                                                                     cdma2000 1xCS: Not supported

                                                                .... ...1 = Notification procedure:

                                                                     Supported

                                                                1... .... = Extended protocol

                                                                   configuration options: Supported

                                                                .0.. .... = Header compression

                                                                   for control plane CIoT EPS

                                                                   optimization: Not supported

                                                                ..0. .... = EMM-REGISTERED w/o

                                                                   PDN connectivity: Not supported

                                                                ...0 .... = S1-U data transfer:

                                                                   Not supported

                                                                .... 0... = User plane CIoT EPS

                                                                   optimization: Not supported

                                                                .... .0.. = Control plane CIoT EPS

                                                                   optimization: Not supported

                                                                .... ..0. = ProSe UE-to-network

                                                                   relay: Not supported

                                                                .... ...0 = ProSe direct

                                                                   communication: Not supported

                                                                1... .... = Signalling for a max                                                                    number of 15 EPS bearer

                                                                   contexts: Supported

                                                                .0.. .... = Service gap control:

                                                                   Not supported

                                                                ..1. .... = N1 mode: Supported

                                                                ...1 .... = Dual connectivity

                                                                   with NR: Supported

                                                                .... 0... = Control plane data

                                                                   backoff: Not supported

                                                                .... .0.. = Restriction on use of

                                                                   enhanced coverage:Not supported

                                                                .... ..0. = V2X communication over

                                                                   PC5: Not supported

                                                                .... ...0 = Multiple DRB:

                                                                   Not supported

                                                            UE's usage setting

                                                                Element ID: 0x18

                                                                Length: 1

                                                                .... 0... = Spare: 0

                                                                .... .0.. = Spare: 0

                                                                .... ..0. = Spare: 0

                                                                .... ...1 = UE's usage setting:

                                                                    Data centric

                                                            LADN indication

                                                                Element ID: 0x74

                                                                Length: 0

                                                            Network slicing indication

                                                                1001 .... = Element ID: 0x9-

                                                                .... 0... = Spare: 0

                                                                .... .0.. = Spare: 0

                                                                .... ..0. = Default configuredNSSAI

                                                                  indication (DCNI): Requested

                                                                   NSSAI not created from default

                                                                   configured NSSAI

                                                                .... ...0 = Network slicing

                                                                   subscription change indication

                                                                   (NSSCI): Not Changed

                                                            5GS update type

                                                                Element ID: 0x53

                                                                Length: 1

                                                                .... 0... = Spare: 0

                                                                .... .0.. = Spare: 0

                                                                .... ..0. = NG-RAN Radio Capability

                                                                   Update (NG-RAN-RCU): Not Needed

                                                                .... ...1 = SMS requested: SMS over

                                                                   NAS supported

                        Item 2: id-UserLocationInformation

                            ProtocolIE-Field

                                id: id-UserLocationInformation (121)

                                criticality: reject (0)

                                value

                                    UserLocationInformation: userLocationInformationNR (1)

                                        userLocationInformationNR

                                            nR-CGI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                nRCellIdentity: 0x0001234501

                                            tAI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                tAC: 100 (0x000064)

                        Item 3: id-RRCEstablishmentCause

                            ProtocolIE-Field

                                id: id-RRCEstablishmentCause (90)

                                criticality: ignore (1)

                                value

                                    RRCEstablishmentCause: mo-Signalling (3)

                        Item 4: id-UEContextRequest

                            ProtocolIE-Field

                                id: id-UEContextRequest (112)

                                criticality: ignore (1)

                                value

                                    UEContextRequest: requested (0)

 

 

(4) DownlinkNasTransport

 

Internet Protocol Version 4, Src: 10.0.0.162, Dst: 10.0.0.185

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 116

    Identification: 0xadd8 (44504)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x76d1 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.162

    Destination Address: 10.0.0.185

Stream Control Transmission Protocol, Src Port: 38412 (38412), Dst Port: 48041 (48041)

    Source port: 38412

    Destination port: 48041

    Verification tag: 0x8d10a6cf

    [Association index: 65535]

    Checksum: 0xe5d8cd9f [unverified]

    [Checksum Status: Unverified]

    SACK chunk (Cumulative TSN: 3757580129, a_rwnd: 106496, gaps: 0, duplicate TSNs: 0)

        Chunk type: SACK (3)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x00

            .... ...0 = Nounce sum: 0

        Chunk length: 16

        Cumulative TSN ACK: 3757580129

            [Acknowledges TSN: 3757580129]

                [Acknowledges TSN in frame: 885]

                [The RTT since DATA was: 0.000119970 seconds]

        Advertised receiver window credit (a_rwnd): 106496

        Number of gap acknowledgement blocks: 0

        Number of duplicated TSNs: 0

    DATA chunk(ordered, complete segment, TSN: 4169966868, SID: 1, SSN: 0, PPID: 60,

                                                           payload length: 50 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 66

        Transmission sequence number: 4169966868

            [This chunk is acked in frame: 893]

                [The RTT to SACK was: 0.046143403 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 0

        Payload protocol identifier: NGAP (60)

        Chunk padding: 0000

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-DownlinkNASTransport (4)

            criticality: ignore (1)

            value

                DownlinkNASTransport

                    protocolIEs: 3 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: reject (0)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-NAS-PDU

                            ProtocolIE-Field

                                id: id-NAS-PDU (38)

                                criticality: reject (0)

                                value

                                    NAS-PDU: 7e034cd87aa9067e005d020004f070f070e157021904f070c040

                                        Non-Access-Stratum 5GS (NAS)PDU

                                            Security protected NAS 5GS message

                                                Extended protocol discriminator:

                                                     5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0011 = Security header type:

                                                     Integrity protected

                                                     with new 5GS security context (3)

                                                Message authentication code: 0x4cd87aa9

                                                Sequence number: 6

                                            Plain NAS 5GS Message

                                                Extended protocol discriminator:

                                                     5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0000 = Security header type:

                                                     Plain NAS message, not security protected (0)

                                                Message type: Security mode command (0x5d)

                                                NAS security algorithms

                                                    0000 .... = Type of ciphering algorithm:

                                                        5G-EA0 (null ciphering algorithm) (0)

                                                    .... 0010 = Type of integrity protection

                                                                algorithm: 128-5G-IA2 (2)

                                                0000 .... = Spare Half Octet: 0

                                                NAS key set identifier - ngKSI

                                                    .... 0... = Type of security context flag(TSC):

                                                             Native security context (for KSIAMF)

                                                    .... .000 = NAS key set identifier: 0

                                                UE security capability -

                                                          Replayed UE security capabilities

                                                    Length: 4

                                                    1... .... = 5G-EA0: Supported

                                                    .1.. .... = 128-5G-EA1: Supported

                                                    ..1. .... = 128-5G-EA2: Supported

                                                    ...1 .... = 128-5G-EA3: Supported

                                                    .... 0... = 5G-EA4: Not supported

                                                    .... .0.. = 5G-EA5: Not supported

                                                    .... ..0. = 5G-EA6: Not supported

                                                    .... ...0 = 5G-EA7: Not supported

                                                    0... .... = 5G-IA0: Not supported

                                                    .1.. .... = 128-5G-IA1: Supported

                                                    ..1. .... = 128-5G-IA2: Supported

                                                    ...1 .... = 128-5G-IA3: Supported

                                                    .... 0... = 5G-IA4: Not supported

                                                    .... .0.. = 5G-IA5: Not supported

                                                    .... ..0. = 5G-IA6: Not supported

                                                    .... ...0 = 5G-IA7: Not supported

                                                    1... .... = EEA0: Supported

                                                    .1.. .... = 128-EEA1: Supported

                                                    ..1. .... = 128-EEA2: Supported

                                                    ...1 .... = 128-EEA3: Supported

                                                    .... 0... = EEA4: Not supported

                                                    .... .0.. = EEA5: Not supported

                                                    .... ..0. = EEA6: Not supported

                                                    .... ...0 = EEA7: Not supported

                                                    0... .... = EIA0: Not supported

                                                    .1.. .... = 128-EIA1: Supported

                                                    ..1. .... = 128-EIA2: Supported

                                                    ...1 .... = 128-EIA3: Supported

                                                    .... 0... = EIA4: Not supported

                                                    .... .0.. = EIA5: Not supported

                                                    .... ..0. = EIA6: Not supported

                                                    .... ...0 = EIA7: Not supported

                                                IMEISV request

                                                    1110 .... = Element ID: 0xe-

                                                    .... 0... = Spare bit(s): 0x00

                                                    .... .001 = IMEISV request: IMEISV requested(1)

                                                NAS security algorithms - Selected EPS NAS

                                                                 security algorithms

                                                    Element ID: 0x57

                                                    0... .... = Spare bit(s): 0x00

                                                    .000 .... = Type of ciphering algorithm:

                                                                EPS encryption algorithm EEA0

                                                    .... 0... = Spare bit(s): 0x00

                                                    .... .010 = Type of integrity protection

                                                        algorithm: EPS integrity algorithm 128-EIA2

                                                UE security capability -

                                                        Replayed S1 UE security capabilities

                                                    Element ID: 0x19

                                                    Length: 4

                                                    1... .... = EEA0: Supported

                                                    .1.. .... = 128-EEA1: Supported

                                                    ..1. .... = 128-EEA2: Supported

                                                    ...1 .... = 128-EEA3: Supported

                                                    .... 0... = EEA4: Not supported

                                                    .... .0.. = EEA5: Not supported

                                                    .... ..0. = EEA6: Not supported

                                                    .... ...0 = EEA7: Not supported

                                                    0... .... = EIA0: Not supported

                                                    .1.. .... = 128-EIA1: Supported

                                                    ..1. .... = 128-EIA2: Supported

                                                    ...1 .... = 128-EIA3: Supported

                                                    .... 0... = EIA4: Not supported

                                                    .... .0.. = EIA5: Not supported

                                                    .... ..0. = EIA6: Not supported

                                                    .... ...0 = EIA7: Not supported

                                                    1... .... = UEA0: Supported

                                                    .1.. .... = UEA1: Supported

                                                    ..0. .... = UEA2: Not supported

                                                    ...0 .... = UEA3: Not supported

                                                    .... 0... = UEA4: Not supported

                                                    .... .0.. = UEA5: Not supported

                                                    .... ..0. = UEA6: Not supported

                                                    .... ...0 = UEA7: Not supported

                                                    0... .... = Spare bit(s): 0x0

                                                    .1.. .... = UIA1: Supported

                                                    ..0. .... = UIA2: Not supported

                                                    ...0 .... = UIA3: Not supported

                                                    .... 0... = UIA4: Not supported

                                                    .... .0.. = UIA5: Not supported

                                                    .... ..0. = UIA6: Not supported

                                                    .... ...0 = UIA7: Not supported

 

 

(5) UplinkNasTransport

 

Internet Protocol Version 4, Src: 10.0.0.185, Dst: 10.0.0.162

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 132

    Identification: 0x000a (10)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x2490 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.185

    Destination Address: 10.0.0.162

Stream Control Transmission Protocol, Src Port: 48041 (48041), Dst Port: 38412 (38412)

    Source port: 48041

    Destination port: 38412

    Verification tag: 0x790ad620

    [Association index: 65535]

    Checksum: 0xb39a1aad [unverified]

    [Checksum Status: Unverified]

    SACK chunk (Cumulative TSN: 4169966868, a_rwnd: 106496, gaps: 0, duplicate TSNs: 0)

        Chunk type: SACK (3)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x00

            .... ...0 = Nounce sum: 0

        Chunk length: 16

        Cumulative TSN ACK: 4169966868

            [Acknowledges TSN: 4169966868]

                [Acknowledges TSN in frame: 886]

                [The RTT since DATA was: 0.046143403 seconds]

        Advertised receiver window credit (a_rwnd): 106496

        Number of gap acknowledgement blocks: 0

        Number of duplicated TSNs: 0

    DATA chunk(ordered, complete segment, TSN: 3757580130, SID: 1, SSN: 1, PPID: 60,

                                          payload length: 65 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 81

        Transmission sequence number: 3757580130

            [This chunk is acked in frame: 894]

                [The RTT to SACK was: 0.000370058 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 1

        Payload protocol identifier: NGAP (60)

        Chunk padding: 000000

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-UplinkNASTransport (46)

            criticality: ignore (1)

            value

                UplinkNASTransport

                    protocolIEs: 4 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: reject (0)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-NAS-PDU

                            ProtocolIE-Field

                                id: id-NAS-PDU (38)

                                criticality: reject (0)

                                value

                                    NAS-PDU: 7e04d3e72791087e005e7700098596500765532619f3

                                        Non-Access-Stratum 5GS (NAS)PDU

                                            Security protected NAS 5GS message

                                                Extended protocol discriminator:

                                                     5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0100 = Security header type:

                                                     Integrity protected and ciphered

                                                     with new 5GS security context (4)

                                                Message authentication code: 0xd3e72791

                                                Sequence number: 8

                                            Encrypted data

                        Item 3: id-UserLocationInformation

                            ProtocolIE-Field

                                id: id-UserLocationInformation (121)

                                criticality: ignore (1)

                                value

                                    UserLocationInformation: userLocationInformationNR (1)

                                        userLocationInformationNR

                                            nR-CGI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                nRCellIdentity: 0x0001234501

                                            tAI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                tAC: 100 (0x000064)

 

 

(6) InitialContextSetupRequest

 

Internet Protocol Version 4, Src: 10.0.0.162, Dst: 10.0.0.185

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 216

    Identification: 0xadd9 (44505)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x766c [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.162

    Destination Address: 10.0.0.185

Stream Control Transmission Protocol, Src Port: 38412 (38412), Dst Port: 48041 (48041)

    Source port: 38412

    Destination port: 48041

    Verification tag: 0x8d10a6cf

    [Association index: 65535]

    Checksum: 0x564117e2 [unverified]

    [Checksum Status: Unverified]

    SACK chunk (Cumulative TSN: 3757580130, a_rwnd: 106496, gaps: 0, duplicate TSNs: 0)

        Chunk type: SACK (3)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x00

            .... ...0 = Nounce sum: 0

        Chunk length: 16

        Cumulative TSN ACK: 3757580130

            [Acknowledges TSN: 3757580130]

                [Acknowledges TSN in frame: 893]

                [The RTT since DATA was: 0.000370058 seconds]

        Advertised receiver window credit (a_rwnd): 106496

        Number of gap acknowledgement blocks: 0

        Number of duplicated TSNs: 0

    DATA chunk(ordered, complete segment, TSN: 4169966869, SID: 1, SSN: 1, PPID: 60,

                                          payload length: 152 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 168

        Transmission sequence number: 4169966869

            [This chunk is acked in frame: 901]

                [The RTT to SACK was: 0.131696577 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 1

        Payload protocol identifier: NGAP (60)

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-InitialContextSetup (14)

            criticality: reject (0)

            value

                InitialContextSetupRequest

                    protocolIEs: 8 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: reject (0)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-GUAMI

                            ProtocolIE-Field

                                id: id-GUAMI (28)

                                criticality: reject (0)

                                value

                                    GUAMI

                                        pLMNIdentity: 00f110

                                            Mobile Country Code (MCC): Unknown (1)

                                            Mobile Network Code (MNC): Unknown (01)

                                        aMFRegionID: 80 [bit length 8, 1000 0000 decimal value 128]

                                        aMFSetID: 0100 [bit length 10, 6 LSB pad bits,

                                            0000 0001  00.. .... decimal value 4]

                                        aMFPointer: 04 [bit length 6, 2 LSB pad bits,

                                            0000 01.. decimal value 1]

                        Item 3: id-AllowedNSSAI

                            ProtocolIE-Field

                                id: id-AllowedNSSAI (0)

                                criticality: reject (0)

                                value

                                    AllowedNSSAI: 1 item

                                        Item 0

                                            AllowedNSSAI-Item

                                                s-NSSAI

                                                    sST: 01

                        Item 4: id-UESecurityCapabilities

                            ProtocolIE-Field

                                id: id-UESecurityCapabilities (119)

                                criticality: reject (0)

                                value

                                    UESecurityCapabilities

                                        nRencryptionAlgorithms: e000 [bit length 16,

                                                     1110 0000  0000 0000 decimal value 57344]

                                            1... .... .... .... = 128-NEA1: Supported

                                            .1.. .... .... .... = 128-NEA2: Supported

                                            ..1. .... .... .... = 128-NEA3: Supported

                                            ...0 0000 0000 0000 = Reserved: 0x0000

                                        nRintegrityProtectionAlgorithms: e000 [bit length 16,

                                                       1110 0000  0000 0000 decimal value 57344]

                                            1... .... .... .... = 128-NIA1: Supported

                                            .1.. .... .... .... = 128-NIA2: Supported

                                            ..1. .... .... .... = 128-NIA3: Supported

                                            ...0 0000 0000 0000 = Reserved: 0x0000

                                        eUTRAencryptionAlgorithms: e000 [bit length 16,

                                                       1110 0000  0000 0000 decimal value 57344]

                                            1... .... .... .... = 128-EEA1: Supported

                                            .1.. .... .... .... = 128-EEA2: Supported

                                            ..1. .... .... .... = 128-EEA3: Supported

                                            ...0 0000 0000 0000 = Reserved: 0x0000

                                        eUTRAintegrityProtectionAlgorithms: e000 [bit length 16,

                                                        1110 0000  0000 0000 decimal value 57344]

                                            1... .... .... .... = 128-EIA1: Supported

                                            .1.. .... .... .... = 128-EIA2: Supported

                                            ..1. .... .... .... = 128-EIA3: Supported

                                            ...0 0000 0000 0000 = Reserved: 0x0000

                        Item 5: id-SecurityKey

                            ProtocolIE-Field

                                id: id-SecurityKey (94)

                                criticality: reject (0)

                                value

                                    SecurityKey: 0cf3d559d8db4b4cb2193a8bbda7... [bit length 256]

                        Item 6: id-NAS-PDU

                            ProtocolIE-Field

                                id: id-NAS-PDU (38)

                                criticality: ignore (1)

                                value

                                    NAS-PDU: 7e02989f23dc077e0042010977000bf200f110800101…

                                        Non-Access-Stratum 5GS (NAS)PDU

                                            Security protected NAS 5GS message

                                                Extended protocol discriminator:

                                                         5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0010 = Security header type:

                                                         Integrity protected and ciphered (2)

                                                Message authentication code: 0x989f23dc

                                                Sequence number: 7

                                            Encrypted data

                        Item 7: id-RedirectionVoiceFallback

                            ProtocolIE-Field

                                id: id-RedirectionVoiceFallback (146)

                                criticality: ignore (1)

                                value

                                    RedirectionVoiceFallback: possible (0)

 

 

(7) UERadioCapabilityInformation

 

This carries Rrc UE capability Information message. This part is not printed in this note since this is more like Rrc Information.

 

 

(8) InitialContextSetupRequest

 

Internet Protocol Version 4, Src: 10.0.0.185, Dst: 10.0.0.162

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 68

    Identification: 0x000d (13)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x24cd [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.185

    Destination Address: 10.0.0.162

Stream Control Transmission Protocol, Src Port: 48041 (48041), Dst Port: 38412 (38412)

    Source port: 48041

    Destination port: 38412

    Verification tag: 0x790ad620

    [Association index: 65535]

    Checksum: 0x2c975cf3 [unverified]

    [Checksum Status: Unverified]

    DATA chunk(ordered, complete segment, TSN: 3757580133, SID: 1, SSN: 3, PPID: 60,

                        payload length: 19 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 35

        Transmission sequence number: 3757580133

            [This chunk is acked in frame: 907]

                [The RTT to SACK was: 0.000376547 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 3

        Payload protocol identifier: NGAP (60)

        Chunk padding: 00

NG Application Protocol

    NGAP-PDU: successfulOutcome (1)

        successfulOutcome

            procedureCode: id-InitialContextSetup (14)

            criticality: reject (0)

            value

                InitialContextSetupResponse

                    protocolIEs: 2 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: ignore (1)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: ignore (1)

                                value

                                    RAN-UE-NGAP-ID: 1

 

 

(9) UplinkNASTransport

 

Internet Protocol Version 4, Src: 10.0.0.185, Dst: 10.0.0.162

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 104

    Identification: 0x000e (14)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x24a8 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.185

    Destination Address: 10.0.0.162

Stream Control Transmission Protocol, Src Port: 48041 (48041), Dst Port: 38412 (38412)

    Source port: 48041

    Destination port: 38412

    Verification tag: 0x790ad620

    [Association index: 65535]

    Checksum: 0x4643a66d [unverified]

    [Checksum Status: Unverified]

    DATA chunk(ordered, complete segment, TSN: 3757580134, SID: 1, SSN: 4, PPID: 60,

                                           payload length: 53 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 69

        Transmission sequence number: 3757580134

            [This chunk is acked in frame: 907]

                [The RTT to SACK was: 0.000018275 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 4

        Payload protocol identifier: NGAP (60)

        Chunk padding: 000000

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-UplinkNASTransport (46)

            criticality: ignore (1)

            value

                UplinkNASTransport

                    protocolIEs: 4 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: reject (0)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-NAS-PDU

                            ProtocolIE-Field

                                id: id-NAS-PDU (38)

                                criticality: reject (0)

                                value

                                    NAS-PDU: 7e021bc4e845097e0043

                                        Non-Access-Stratum 5GS (NAS)PDU

                                            Security protected NAS 5GS message

                                                Extended protocol discriminator:

                                                       5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0010 = Security header type:

                                                       Integrity protected and ciphered (2)

                                                Message authentication code: 0x1bc4e845

                                                Sequence number: 9

                                            Encrypted data

                        Item 3: id-UserLocationInformation

                            ProtocolIE-Field

                                id: id-UserLocationInformation (121)

                                criticality: ignore (1)

                                value

                                    UserLocationInformation: userLocationInformationNR (1)

                                        userLocationInformationNR

                                            nR-CGI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                nRCellIdentity: 0x0001234501

                                            tAI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                tAC: 100 (0x000064)

 

 

(10) DownlinkNASTransport

 

Internet Protocol Version 4, Src: 10.0.0.162, Dst: 10.0.0.185

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 124

    Identification: 0xaddc (44508)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x76c5 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.162

    Destination Address: 10.0.0.185

Stream Control Transmission Protocol, Src Port: 38412 (38412), Dst Port: 48041 (48041)

    Source port: 38412

    Destination port: 48041

    Verification tag: 0x8d10a6cf

    [Association index: 65535]

    Checksum: 0xd913f52a [unverified]

    [Checksum Status: Unverified]

    DATA chunk(ordered, complete segment, TSN: 4169966870, SID: 1, SSN: 2, PPID: 60,

                                          payload length: 76 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 92

        Transmission sequence number: 4169966870

            [This chunk is acked in frame: 909]

                [The RTT to SACK was: 0.299073623 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 2

        Payload protocol identifier: NGAP (60)

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-DownlinkNASTransport (4)

            criticality: ignore (1)

            value

                DownlinkNASTransport

                    protocolIEs: 3 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: reject (0)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-NAS-PDU

                            ProtocolIE-Field

                                id: id-NAS-PDU (38)

                                criticality: reject (0)

                                value

                                    NAS-PDU: 7e02708c9be0087e0054431081c176589e9ebfcd…

                                        Non-Access-Stratum 5GS (NAS)PDU

                                            Security protected NAS 5GS message

                                                Extended protocol discriminator:

                                                     5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0010 = Security header type:

                                                     Integrity protected and ciphered (2)

                                                Message authentication code: 0x708c9be0

                                                Sequence number: 8

                                            Encrypted data

 

 

(11) UplinkNASTransport

 

Internet Protocol Version 4, Src: 10.0.0.185, Dst: 10.0.0.162

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 228

    Identification: 0x0010 (16)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x242a [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.185

    Destination Address: 10.0.0.162

Stream Control Transmission Protocol, Src Port: 48041 (48041), Dst Port: 38412 (38412)

    Source port: 48041

    Destination port: 38412

    Verification tag: 0x790ad620

    [Association index: 65535]

    Checksum: 0x39273ca9 [unverified]

    [Checksum Status: Unverified]

    DATA chunk(ordered, complete segment, TSN: 3757580135, SID: 1, SSN: 5, PPID: 60,

                  payload length: 180 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 196

        Transmission sequence number: 3757580135

            [This chunk is acked in frame: 911]

                [The RTT to SACK was: 0.000140996 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 5

        Payload protocol identifier: NGAP (60)

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-UplinkNASTransport (46)

            criticality: ignore (1)

            value

                UplinkNASTransport

                    protocolIEs: 4 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: reject (0)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-NAS-PDU

                            ProtocolIE-Field

                                id: id-NAS-PDU (38)

                                criticality: reject (0)

                                value

                                    NAS-PDU: 7e02c3faa3fa0a7e006701006b2e0114c1000093280100…

                                        Non-Access-Stratum 5GS (NAS)PDU

                                            Security protected NAS 5GS message

                                                Extended protocol discriminator:

                                                    5G mobility management messages (126)

                                                0000 .... = Spare Half Octet: 0

                                                .... 0010 = Security header type:

                                                    Integrity protected and ciphered (2)

                                                Message authentication code: 0xc3faa3fa

                                                Sequence number: 10

                                            Encrypted data

                        Item 3: id-UserLocationInformation

                            ProtocolIE-Field

                                id: id-UserLocationInformation (121)

                                criticality: ignore (1)

                                value

                                    UserLocationInformation: userLocationInformationNR (1)

                                        userLocationInformationNR

                                            nR-CGI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                nRCellIdentity: 0x0001234501

                                            tAI

                                                pLMNIdentity: 00f110

                                                    Mobile Country Code (MCC): Unknown (1)

                                                    Mobile Network Code (MNC): Unknown (01)

                                                tAC: 100 (0x000064)

 

 

 

PDU Session Resource Setup

 

The purpose of the PDU Session Resource Setup is as follows :

  • assign resources on Uu and NG-U for one or several PDU sessions and the corresponding QoS flows
  • setup corresponding DRBs for a given UE

 

Overall signaling procecedure is as follows and the details are described in 38.413 - 8.2.1.

 

< 38.413 - Figure 8.2.1.2-1: PDU session resource setup: successful operation >

 

This process is the one that get a huge list of parameters involved. The details are described in 38.413-8.2.1, but it doesn't make clear sense to me yet. I would need more study and log analysis for deeper understanding. The list of parameters explained in this specification is as follows to give you some generic idea.

  • PDU SESSION RESOURCE SETUP REQUEST
    • PDU Session Resource Setup Request List
      • DUSessionNAS-PDU
      • PDU Session ID
    • RAN Paging Priority
    • PDU Session Resource Setup Request Transfer IE
      • UL NG-U UP TNL Information
      • Additional UL NG-U UP TNL Information
      • Common Network Instance
      • Network Instance
      • UP Transport Layer Information List
      • Redundant UL NG-U UP TNL Information
      • Redundant QoS Flow per TNL Information
      • Additional Redundant DL QoS Flow per TNL Information
      • TSC Traffic Characteristics
      • PDU Session Type
      • Security Indication
        • Integrity Protection Indication
        • Confidentiality Protection Indication
        • Maximum Integrity Protected Data Rate Downlink
        • Maximum Integrity Protected Data Rate Uplink
      • PDU Session Aggregate Maximum Bit Rate
      • QoS Flow Level QoS Parameters
        • Additional QoS Flow Information
        • QoS Monitoring Request
        • Flow Level QoS Parameters
      • GBR QoS Flow Information
        • Alternative QoS Parameters Set List
      • Redundant QoS Flow Indicator
      • Redundant PDU Session Information
      • PDU Session Expected UE Activity Behaviour

 

  • PDU SESSION RESOURCE SETUP RESPONSE
    • PDU Session Resource Setup Response Transfer
      • Integrity Protection Result
      • Confidentiality Protection Result IE
      • Current QoS Parameters Set Index
      • Global RAN Node ID of Secondary NG-RAN Node
      • QoS Flow per TNL Information
      • QoS Flow Failed to Setup List
      • PDU Session Resource Setup Unsuccessful Transfer

 

 

 

(12) PDUSessionResourceSetupRequest

 

Internet Protocol Version 4, Src: 10.0.0.162, Dst: 10.0.0.185

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 292

    Identification: 0xaddd (44509)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x761c [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.162

    Destination Address: 10.0.0.185

Stream Control Transmission Protocol, Src Port: 38412 (38412), Dst Port: 48041 (48041)

    Source port: 38412

    Destination port: 48041

    Verification tag: 0x8d10a6cf

    [Association index: 65535]

    Checksum: 0xf21498ba [unverified]

    [Checksum Status: Unverified]

    SACK chunk (Cumulative TSN: 3757580135, a_rwnd: 106496, gaps: 0, duplicate TSNs: 0)

        Chunk type: SACK (3)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x00

            .... ...0 = Nounce sum: 0

        Chunk length: 16

        Cumulative TSN ACK: 3757580135

            [Acknowledges TSN: 3757580135]

                [Acknowledges TSN in frame: 910]

                [The RTT since DATA was: 0.000140996 seconds]

        Advertised receiver window credit (a_rwnd): 106496

        Number of gap acknowledgement blocks: 0

        Number of duplicated TSNs: 0

    DATA chunk(ordered, complete segment, TSN: 4169966871, SID: 1, SSN: 3, PPID: 60,

                                                                    payload length: 228 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 244

        Transmission sequence number: 4169966871

            [This chunk is acked in frame: 914]

                [The RTT to SACK was: 0.035658957 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 3

        Payload protocol identifier: NGAP (60)

NG Application Protocol

    NGAP-PDU: initiatingMessage (0)

        initiatingMessage

            procedureCode: id-PDUSessionResourceSetup (29)

            criticality: reject (0)

            value

                PDUSessionResourceSetupRequest

                    protocolIEs: 4 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: reject (0)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: reject (0)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-PDUSessionResourceSetupListSUReq

                            ProtocolIE-Field

                                id: id-PDUSessionResourceSetupListSUReq (74)

                                criticality: reject (0)

                                value

                                    PDUSessionResourceSetupListSUReq: 1 item

                                        Item 0

                                            PDUSessionResourceSetupItemSUReq

                                                pDUSessionID: 1

                                                pDUSessionNAS-PDU: 7e02ba31020b097e006801…

                                                    Non-Access-Stratum 5GS (NAS)PDU

                                                        Security protected NAS 5GS message

                                                            Extended protocol discriminator:

                                                               5G mobility management messages (126)

                                                            0000 .... = Spare Half Octet: 0

                                                            .... 0010 = Security header type:

                                                                Integrity protected and ciphered (2)

                                                            Message authentication code: 0xba31020b

                                                            Sequence number: 9

                                                        Encrypted data

                                                s-NSSAI

                                                    sST: 01

                                                pDUSessionResourceSetupRequestTransfer: 0000040082…

                                                    PDUSessionResourceSetupRequestTransfer

                                                        protocolIEs: 4 items

                                            Item 0: id-PDUSessionAggregateMaximumBitRate

                                                ProtocolIE-Field

                                                    id: id-PDUSessionAggregateMaximumBitRate

                                                    criticality: reject (0)

                                                    value

                                                        PDUSessionAggregateMaximumBitRate

                                                            pDUSessionAggregateMaximumBitRateDL:

                                                                 3000000000bits/s

                                                            pDUSessionAggregateMaximumBitRateUL:

                                                                 1000000000bits/s

                                            Item 1: id-UL-NGU-UP-TNLInformation

                                                ProtocolIE-Field

                                                    id: id-UL-NGU-UP-TNLInformation (139)

                                                    criticality: reject (0)

                                                    value

                                                        UPTransportLayerInformation: gTPTunnel(0)

                                                            gTPTunnel

                                                                transportLayerAddress:

                                                                       0a0000a2]

                                                                    TransportLayerAddress

                                                                       (IPv4): 10.0.0.162

                                                                gTP-TEID: 4f485cc3

                                            Item 2: id-PDUSessionType

                                                ProtocolIE-Field

                                                    id: id-PDUSessionType (134)

                                                    criticality: reject (0)

                                                    value

                                                        PDUSessionType: ipv4 (0)

                                            Item 3: id-QosFlowSetupRequestList

                                                ProtocolIE-Field

                                                    id: id-QosFlowSetupRequestList (136)

                                                    criticality: reject (0)

                                                    value

                                                        QosFlowSetupRequestList: 1 item

                                                            Item 0

                                                                QosFlowSetupRequestItem

                                                                  qosFlowIdentifier: 1

                                                                  qosFlowLevelQosParameters

                                                                     qosCharacteristics:

                                                                                nonDynamic5QI (0)

                                                                            nonDynamic5QI

                                                                                fiveQI: 9

                                                                     allocationAndRetentionPriority

                                                                        priorityLevelARP: 15

                                                                        pre-emptionCapability:

                                                                           shall-not-trigger-

                                                                                pre-emption

                                                                           preemptionVulnerability:

                                                                              not-pre-emptable (0)

                                                                    e-RAB-ID: 5

        Item 3: id-UEAggregateMaximumBitRate

            ProtocolIE-Field

                id: id-UEAggregateMaximumBitRate (110)

                criticality: ignore (1)

                value

                    UEAggregateMaximumBitRate

                        uEAggregateMaximumBitRateDL: 3000000000bits/s

                        uEAggregateMaximumBitRateUL: 1000000000bits/s

 

 

(13) PDUSessionResourceSetupResponse

 

Internet Protocol Version 4, Src: 10.0.0.185, Dst: 10.0.0.162

    0100 .... = Version: 4

    .... 0101 = Header Length: 20 bytes (5)

    Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))

        0000 00.. = Differentiated Services Codepoint: Default (0)

        .... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)

    Total Length: 104

    Identification: 0x0011 (17)

    Flags: 0x40, Don't fragment

        0... .... = Reserved bit: Not set

        .1.. .... = Don't fragment: Set

        ..0. .... = More fragments: Not set

    Fragment Offset: 0

    Time to Live: 64

    Protocol: SCTP (132)

    Header Checksum: 0x24a5 [validation disabled]

    [Header checksum status: Unverified]

    Source Address: 10.0.0.185

    Destination Address: 10.0.0.162

Stream Control Transmission Protocol, Src Port: 48041 (48041), Dst Port: 38412 (38412)

    Source port: 48041

    Destination port: 38412

    Verification tag: 0x790ad620

    [Association index: 65535]

    Checksum: 0x1ef6563e [unverified]

    [Checksum Status: Unverified]

    SACK chunk (Cumulative TSN: 4169966871, a_rwnd: 106496, gaps: 0, duplicate TSNs: 0)

        Chunk type: SACK (3)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x00

            .... ...0 = Nounce sum: 0

        Chunk length: 16

        Cumulative TSN ACK: 4169966871

            [Acknowledges TSN: 4169966871]

                [Acknowledges TSN in frame: 911]

                [The RTT since DATA was: 0.035658957 seconds]

        Advertised receiver window credit (a_rwnd): 106496

        Number of gap acknowledgement blocks: 0

        Number of duplicated TSNs: 0

    DATA chunk(ordered, complete segment, TSN: 3757580136, SID: 1, SSN: 6, PPID: 60,

                                                             payload length: 40 bytes)

        Chunk type: DATA (0)

            0... .... = Bit: Stop processing of the packet

            .0.. .... = Bit: Do not report

        Chunk flags: 0x03

            .... 0... = I-Bit: Possibly delay SACK

            .... .0.. = U-Bit: Ordered delivery

            .... ..1. = B-Bit: First segment

            .... ...1 = E-Bit: Last segment

        Chunk length: 56

        Transmission sequence number: 3757580136

            [This chunk is acked in frame: 931]

                [The RTT to SACK was: 0.201436229 seconds]

        Stream identifier: 0x0001

        Stream sequence number: 6

        Payload protocol identifier: NGAP (60)

NG Application Protocol

    NGAP-PDU: successfulOutcome (1)

        successfulOutcome

            procedureCode: id-PDUSessionResourceSetup (29)

            criticality: reject (0)

            value

                PDUSessionResourceSetupResponse

                    protocolIEs: 3 items

                        Item 0: id-AMF-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-AMF-UE-NGAP-ID (10)

                                criticality: ignore (1)

                                value

                                    AMF-UE-NGAP-ID: 102

                        Item 1: id-RAN-UE-NGAP-ID

                            ProtocolIE-Field

                                id: id-RAN-UE-NGAP-ID (85)

                                criticality: ignore (1)

                                value

                                    RAN-UE-NGAP-ID: 1

                        Item 2: id-PDUSessionResourceSetupListSURes

                            ProtocolIE-Field

                                id: id-PDUSessionResourceSetupListSURes (75)

                                criticality: ignore (1)

                                value

                                    PDUSessionResourceSetupListSURes: 1 item

                                        Item 0

                                          PDUSessionResourceSetupItemSURes

                                             pDUSessionID: 1

                                             pDUSessionResourceSetupResponseTransfer:

                                                          0003e00a0000b9a968d0db0001

                                                PDUSessionResourceSetupResponseTransfer

                                                   dLQosFlowPerTNLInformation

                                                        uPTransportLayerInformation: gTPTunnel (0)

                                                            gTPTunnel

                                                                transportLayerAddress: 0a0000b9

                                                                    TransportLayerAddress (IPv4):

                                                                                        10.0.0.185

                                                                    gTP-TEID: a968d0db

                                                            associatedQosFlowList: 1 item

                                                                Item 0

                                                                    AssociatedQosFlowItem

                                                                        qosFlowIdentifier: 1

 

 

 

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