2G/GSM

  

 

 

 

T3302

 

T3302 is timer that is related to GPRS Attach process. The function of these timers are defined in 24.008 as follows.

 

< Table 11.3a/3GPP TS 24.008: GPRS Mobility management timers – MS side >

 

If I represent into sequence diagram, it can be as follows.

 

Example 1 >

 

Step

Direction

Message

Comment

1

UE <-> NW

< Complete Location Update >

 

2

UE -> NW

Channel Request/Handover Access

  

3

UE <- NW

Immediate Assignment

  

4

UE -> NW

Attach Request

  

5

UE <- NW

Attach Reject (Cause #17)

 1st Reject

6

UE -> NW

Channel Request/Handover Access

  

7

UE <- NW

Immediate Assignment

  

8

UE -> NW

Attach Request

  

9

UE <- NW

Attach Reject (Cause #17)

 2nd Reject

10

UE -> NW

Channel Request/Handover Access

  

11

UE <- NW

Immediate Assignment

  

12

UE -> NW

Attach Request

  

13

UE <- NW

Attach Reject (Cause #17)

 3rd Reject

14

UE -> NW

Channel Request/Handover Access

 

15

UE <- NW

Immediate Assignment

 

16

UE -> NW

Attach Request

 

17

UE <- NW

Attach Reject (Cause #17)

 4th Reject

18

UE -> NW

Channel Request/Handover Access

 

19

UE <- NW

Immediate Assignment

 

20

UE -> NW

Attach Request

 

21

UE <- NW

Attach Reject (Cause #17)

 5th Reject

22

UE

< Start T3302 >

 

23

UE

 

UE Should not Retry Attach until T3320 Expires

 

 

 

 

 

 

(4)(8)(12)(16)(20)Attach Request

 

DLT: 147, Payload: gsm_a_dtap (GSM A-I/F DTAP)

GSM A-I/F DTAP - Attach Request

    Protocol Discriminator: GPRS mobility management messages

        .... 1000 = Protocol discriminator: GPRS mobility management messages (0x08)

        0000 .... = Skip Indicator: No indication of selected PLMN (0)

    DTAP GPRS Mobility Management Message Type: Attach Request (0x01)

    MS Network Capability

        Length: 1

        1... .... = GEA/1: Encryption algorithm available

        .1.. .... = SM capabilities via dedicated channels: Mobile station supports mobile terminated

                     point to point SMS via dedicated signalling channels

        ..1. .... = SM capabilities via GPRS channels: Mobile station supports mobile terminated

                     point to point SMS via GPRS packet data channels

        ...0 .... = UCS2 support: Mobile station does not support mobile terminated

                     point to point SMS via GPRS packet data channels

        .... 01.. = SS Screening Indicator: capability of handling of ellipsis notation

                     and phase 2 error handling (0x01)

        .... ..0. = SoLSA Capability: The ME does not support SoLSA

        .... ...0 = Revision level indicator: Used by a mobile station not supporting R99

                     or later versions of the protocol

    Attach Type

        0000 .... = Ciphering key sequence number: 0

        Attach Type

            .... 0... = Follow-on request pending: False

            .... .001 = Type of attach: GPRS attach (1)

    DRX Parameter

        DRX Parameter

            Split PG Cycle Code: Reserved, interpreted as 1 (10)

            0000 .... = CN Specific DRX cycle length coefficient: CN Specific DRX cycle length coefficient

                        / value not specified by the MS (0)

            .... 0... = SPLIT on CCCH: Split pg cycle on CCCH is not supported by the mobile station

            .... .000 = Non-DRX timer: no non-DRX mode after transfer state (0)

    Mobile Identity - IMSI (001010123456789)

        Length: 8

        0000 .... = Identity Digit 1: 0

        .... 1... = Odd/even indication: Odd number of identity digits

        .... .001 = Mobile Identity Type: IMSI (1)

        BCD Digits: 001010123456789

    Routing Area Identification - Old routing area identification - RAI: 450-5-0-128

        Routing area identification: 450-5-0-128

            Mobile Country Code (MCC): Korea (Republic of) (450)

            Mobile Network Code (MNC): Unknown (05)

            Location Area Code (LAC): 0x0000 (0)

            Routing Area Code (RAC): 0x80 (128)

    MS Radio Access Capability

        Length: 11

        MS RA capability 1

            0001 .... = Access Technology Type: GSM E --note that GSM E covers GSM P (1)

            .... 0100  001. .... = Length in bits: 0x21 (33)

            ...1 00.. RF Power Capability, GMSK Power Class: 2 W (33 dBm) (4)

            A5 Bits: A5 bits follow (1)

            A5/1: encryption algorithm available (1)

            A5/2: encryption algorithm not available (0)

            A5/3: encryption algorithm available (1)

            A5/4: encryption algorithm not available (0)

            A5/5: encryption algorithm not available (0)

            A5/6: encryption algorithm not available (0)

            A5/7: encryption algorithm not available (0)

            .... ..1. = Controlled early Classmark Sending: Implemented

            .... ...1 = Pseudo Synchronisation: Present

            0... .... = Voice Group Call Service: no VGCS capability or no notifications wanted

            .0.. .... = Voice Broadcast Service: no VBS capability or no notifications wanted

            ..1. .... = Multislot capability struct: Present

                HSCSD multislot class: Bits are not available (0)

                .... 0111 = SMS_VALUE (Switch-Measure-Switch): 8/4 timeslot (~1154 microseconds) (7)

                0001 .... = (SM_VALUE) Switch-Measure: 2/4 timeslot (~288 microseconds) (1)

            .... .011  00.. .... = GPRS multislot class: Max Rx-Slot/TDMA:4 Max Tx-Slot

                                   /TDMA:4 Max-Sum-Slot/TDMA:5 Tta:2 Ttb:1 Tra:2 Trb:1 Type:1 (12)

            ..1. .... = GPRS Extended Dynamic Allocation Capability: Implemented

        MS RA capability 2

            .... .001  1... .... = Access Technology Type: GSM 1800 (3)

            .001 1010 = Length in bits: 0x1a (26)

            001. .... RF Power Capability, GMSK Power Class: 1 W (30 dBm) (1)

            A5 Bits: Same values apply for parameters as in the immediately

                      preceding Access capabilities field within this IE (0)

            .... 1... = Controlled early Classmark Sending: Implemented

            .... .1.. = Pseudo Synchronisation: Present

            .... ..0. = Voice Group Call Service: no VGCS capability or no notifications wanted

            .... ...0 = Voice Broadcast Service: no VBS capability or no notifications wanted

            1... .... = Multislot capability struct: Present

                HSCSD multislot class: Bits are not available (0)

                ..01 11.. = SMS_VALUE (Switch-Measure-Switch): 8/4 timeslot (~1154 microseconds) (7)

                .... ..00  01.. .... = (SM_VALUE) Switch-Measure: 2/4 timeslot (~288 microseconds) (1)

            ...0 1100 = GPRS multislot class: Max Rx-Slot/TDMA:4 Max Tx-Slot/TDMA:4 Max-Sum-Slot

                         /TDMA:5 Tta:2 Ttb:1 Tra:2 Trb:1 Type:1 (12)

            1... .... = GPRS Extended Dynamic Allocation Capability: Implemented

    GPRS Timer - Ready Timer

        Element ID: 0x17

        GPRS Timer: 10 sec

            000. .... = Unit: value is incremented in multiples of 2 seconds (0)

            ...0 0101 = Timer value: 5

    UE network capability

        Element ID: 0x58

        Length: 4

        1... .... = EEA0: Supported

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

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

        ...0 .... = 128-EEA3: Not 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

        ...0 .... = 128-EIA3: Not 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.. .... = UMTS integrity algorithm UIA1: Supported

        ..0. .... = UMTS integrity algorithm UIA2: Not Supported

        ...0 .... = UMTS integrity algorithm UIA3: Not Supported

        .... 0... = UMTS integrity algorithm UIA4: Not Supported

        .... .0.. = UMTS integrity algorithm UIA5: Not Supported

        .... ..0. = UMTS integrity algorithm UIA6: Not Supported

        .... ...0 = UMTS integrity algorithm UIA7: Not Supported

    Voice domain preference and UE's usage setting

        Element ID: 0x5d

        Length: 1

        0000 0... = Spare bit(s): 0

        .... .0.. = UE's usage setting: Voice centric

        .... ..01 = Voice domain preference for E-UTRAN: IMS PS Voice only (1)

 

 

(5)(9)(13)(17)(21)Attach Request

 

DLT: 147, Payload: gsm_a_dtap (GSM A-I/F DTAP)

GSM A-I/F DTAP - Attach Reject

    Protocol Discriminator: GPRS mobility management messages

        .... 1000 = Protocol discriminator: GPRS mobility management messages (0x08)

        0000 .... = Skip Indicator: No indication of selected PLMN (0)

    DTAP GPRS Mobility Management Message Type: Attach Reject (0x04)

    GMM Cause

        GMM Cause: Network failure (17)