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HUAWEI BSC6000 Base Station Subsystem
Signaling Analysis Guide                                                                         9 TMSI Reallocation




                                                            9          TMSI Reallocation


About This Chapter

                    The TMSI reallocation takes place in ciphering mode. It is generally related to another procedure,
                    such as location update or call establishment.

                    9.1 TMSI Reallocation Procedure
                    The purpose of the TMSI reallocation procedure is to provide identity confidentiality, that is, to
                    protect a user against being identified and located by an intruder. Usually, the TMSI reallocation
                    is performed at least at each change of a location area. It can be initiated at any time by the
                    network if an RR connection exists between the network and an MS.
                    9.2 Internal BSC Signaling Procedure of TMSI Reallocation
                    This topic describes the internal BSC signaling procedure of TMSI reallocation.
                    9.3 Abnormal TMSI Reallocation Cases
                    This topic describes the abnormal TMSI reallocation cases.




Issue 01 (2007-09-05)                              Huawei Technologies Proprietary                                9-1
HUAWEI BSC6000 Base Station Subsystem
9 TMSI Reallocation                                                                     Signaling Analysis Guide




9.1 TMSI Reallocation Procedure
                      The purpose of the TMSI reallocation procedure is to provide identity confidentiality, that is, to
                      protect a user against being identified and located by an intruder. Usually, the TMSI reallocation
                      is performed at least at each change of a location area. It can be initiated at any time by the
                      network if an RR connection exists between the network and an MS.
                      Figure 9-1 shows the TMSI reallocation procedure.

                      Figure 9-1 TMSI reallocation procedure

                           MS                    BTS                         BSC                  MSC

                                                               TMSI
                                                     Reallocation Command(1)
                                         SDCCH

                                                                                               Start T3250
                                                               TMSI
                                                     Reallocation Complete(2)
                                SDCCH

                                                                                               StopT3250




                      The TMSI reallocation procedure is as follows:
                      l    The network initiates the TMSI reallocation procedure by sending a TMSI Reallocation
                           Command message to the MS and starts timer T3250. The TMSI Reallocation Command
                           message carries a new combination of TMSI and LAI allocated by the network or an LAI
                           and the IMSI if the used TMSI is deleted. Usually, the TMSI Reallocation Command
                           message is sent to the MS using an RR connection in ciphering mode.
                      l    Upon receiving the TMSI Reallocation Command message, the MS stores the LAI in the
                           SIM. If the received identity is the IMSI of the relevant MS, the MS deletes any TMSI. If
                           the received identity is a TMSI, the MS stores the TMSI in the SIM. In both cases, the MS
                           sends a TMSI Reallocation Complete message to the network.
                           Upon receiving the TMSI Reallocation Complete message, the network stops timer T3250.
                           If a TMSI is sent to the MS, the network considers the new TMSI as valid. If an IMSI is
                           sent to the MS, the network considers the old TMSI as deleted.


9.2 Internal BSC Signaling Procedure of TMSI Reallocation
                      This topic describes the internal BSC signaling procedure of TMSI reallocation.
                      The network initiates and controls the TMSI reallocation procedure and the BSC does no special
                      processing.




9-2                               Huawei Technologies Proprietary                                 Issue 01 (2007-09-05)
HUAWEI BSC6000 Base Station Subsystem
Signaling Analysis Guide                                                                         9 TMSI Reallocation




9.3 Abnormal TMSI Reallocation Cases
                    This topic describes the abnormal TMSI reallocation cases.

                    9.3.1 TMSI Reallocation Caused by RR Connection Failure on the Network Side
                    This topic describes the fault, probable causes, and handling suggestions.
                    9.3.2 TMSI Reallocation Caused by T3250 Expiry
                    This topic describes the fault, probable causes, and handling suggestions.

9.3.1 TMSI Reallocation Caused by RR Connection Failure on the
Network Side
                    This topic describes the fault, probable causes, and handling suggestions.

Fault
                    The TMSI is reallocated due to RR connection failure on the network side.

Probable Causes
                    If the RR connection fails before the TMSI Reallocation Complete message is received, all MM
                    connections should be released and both the old and the new TMSIs should be considered as
                    occupied for a certain recovery time.

                    During this period the network may:
                    l    Use the IMSI for paging if the MS is the called party. Upon response from the MS, the
                         TMSI reallocation is restarted.
                    l    Consider the new TMSI as valid if the MS is the calling party.
                    Initiate an identification procedure followed by a new TMSI reallocation if the MS uses the old
                    TMSI.

Handling Suggestions
                    No handling is required.

9.3.2 TMSI Reallocation Caused by T3250 Expiry
                    This topic describes the fault, probable causes, and handling suggestions.

Fault
                    The network releases the RR connection.

Probable Causes
                    The TMSI reallocation is supervised by the timer T3250 in the network. At the first expiry of
                    timer T3250, the network releases the RR connection. In this case, the network aborts the
                    reallocation procedure, releases all MM connections, and follows the rules for RR connection
                    failure.

Issue 01 (2007-09-05)                             Huawei Technologies Proprietary                               9-3
HUAWEI BSC6000 Base Station Subsystem
9 TMSI Reallocation                                                             Signaling Analysis Guide


Handling Suggestions
                      The BSC does no special processing.




9-4                              Huawei Technologies Proprietary                     Issue 01 (2007-09-05)

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01 09 tmsi reallocation

  • 1. HUAWEI BSC6000 Base Station Subsystem Signaling Analysis Guide 9 TMSI Reallocation 9 TMSI Reallocation About This Chapter The TMSI reallocation takes place in ciphering mode. It is generally related to another procedure, such as location update or call establishment. 9.1 TMSI Reallocation Procedure The purpose of the TMSI reallocation procedure is to provide identity confidentiality, that is, to protect a user against being identified and located by an intruder. Usually, the TMSI reallocation is performed at least at each change of a location area. It can be initiated at any time by the network if an RR connection exists between the network and an MS. 9.2 Internal BSC Signaling Procedure of TMSI Reallocation This topic describes the internal BSC signaling procedure of TMSI reallocation. 9.3 Abnormal TMSI Reallocation Cases This topic describes the abnormal TMSI reallocation cases. Issue 01 (2007-09-05) Huawei Technologies Proprietary 9-1
  • 2. HUAWEI BSC6000 Base Station Subsystem 9 TMSI Reallocation Signaling Analysis Guide 9.1 TMSI Reallocation Procedure The purpose of the TMSI reallocation procedure is to provide identity confidentiality, that is, to protect a user against being identified and located by an intruder. Usually, the TMSI reallocation is performed at least at each change of a location area. It can be initiated at any time by the network if an RR connection exists between the network and an MS. Figure 9-1 shows the TMSI reallocation procedure. Figure 9-1 TMSI reallocation procedure MS BTS BSC MSC TMSI Reallocation Command(1) SDCCH Start T3250 TMSI Reallocation Complete(2) SDCCH StopT3250 The TMSI reallocation procedure is as follows: l The network initiates the TMSI reallocation procedure by sending a TMSI Reallocation Command message to the MS and starts timer T3250. The TMSI Reallocation Command message carries a new combination of TMSI and LAI allocated by the network or an LAI and the IMSI if the used TMSI is deleted. Usually, the TMSI Reallocation Command message is sent to the MS using an RR connection in ciphering mode. l Upon receiving the TMSI Reallocation Command message, the MS stores the LAI in the SIM. If the received identity is the IMSI of the relevant MS, the MS deletes any TMSI. If the received identity is a TMSI, the MS stores the TMSI in the SIM. In both cases, the MS sends a TMSI Reallocation Complete message to the network. Upon receiving the TMSI Reallocation Complete message, the network stops timer T3250. If a TMSI is sent to the MS, the network considers the new TMSI as valid. If an IMSI is sent to the MS, the network considers the old TMSI as deleted. 9.2 Internal BSC Signaling Procedure of TMSI Reallocation This topic describes the internal BSC signaling procedure of TMSI reallocation. The network initiates and controls the TMSI reallocation procedure and the BSC does no special processing. 9-2 Huawei Technologies Proprietary Issue 01 (2007-09-05)
  • 3. HUAWEI BSC6000 Base Station Subsystem Signaling Analysis Guide 9 TMSI Reallocation 9.3 Abnormal TMSI Reallocation Cases This topic describes the abnormal TMSI reallocation cases. 9.3.1 TMSI Reallocation Caused by RR Connection Failure on the Network Side This topic describes the fault, probable causes, and handling suggestions. 9.3.2 TMSI Reallocation Caused by T3250 Expiry This topic describes the fault, probable causes, and handling suggestions. 9.3.1 TMSI Reallocation Caused by RR Connection Failure on the Network Side This topic describes the fault, probable causes, and handling suggestions. Fault The TMSI is reallocated due to RR connection failure on the network side. Probable Causes If the RR connection fails before the TMSI Reallocation Complete message is received, all MM connections should be released and both the old and the new TMSIs should be considered as occupied for a certain recovery time. During this period the network may: l Use the IMSI for paging if the MS is the called party. Upon response from the MS, the TMSI reallocation is restarted. l Consider the new TMSI as valid if the MS is the calling party. Initiate an identification procedure followed by a new TMSI reallocation if the MS uses the old TMSI. Handling Suggestions No handling is required. 9.3.2 TMSI Reallocation Caused by T3250 Expiry This topic describes the fault, probable causes, and handling suggestions. Fault The network releases the RR connection. Probable Causes The TMSI reallocation is supervised by the timer T3250 in the network. At the first expiry of timer T3250, the network releases the RR connection. In this case, the network aborts the reallocation procedure, releases all MM connections, and follows the rules for RR connection failure. Issue 01 (2007-09-05) Huawei Technologies Proprietary 9-3
  • 4. HUAWEI BSC6000 Base Station Subsystem 9 TMSI Reallocation Signaling Analysis Guide Handling Suggestions The BSC does no special processing. 9-4 Huawei Technologies Proprietary Issue 01 (2007-09-05)