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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.
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 :
According to 38.410-4.4, NGAP support following capabilities :
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 :
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 >
< 38.413 - v16.7 :Table 8.1-2: Class 2 procedures >
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.
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.
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.
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.
Followings are statements from 38.413-8.7.1.2 that are related to processing the information elements in NG SETUP RESPONSE message.
(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
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.
(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)
The purpose of the PDU Session Resource Setup is as follows :
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.
(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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