4.1.1 Detailed procedure in the MSC

23.0123GPPLocation management proceduresRelease 17TS Process Update_Location_Area_MSC

Sheet 1: Location Update corresponds to a Location_Registration_Request indicating any of the following:

– Normal location update;

– Periodic location update;

– IMSI attach.

Sheet 1: The procedures Check_IMEI_MSC, Obtain_IMEI_MSC and Obtain_IMSI_MSC are specified in 3GPP TS 23.018 [5a].

Sheet 1: The input signal "Send UESBI-Iu to Access Network" carries the IMEISV.

Sheet 1: The task "Convert IMEISV to UESBI" is defined in 3GPP TS 23.195 [11a].

Sheet 2: The procedure Check_IMEI_MSC is specified in 3GPP TS 23.018 [5a].

Sheet 2: When the MSC receives a Set Ciphering Mode request from the VLR, it sends a Start ciphering request towards the MS. After that, the Forward new TMSI and Update Location Area ack may be received in any order.

Sheet 2: The Forward new TMSI may also be received prior to Update Location Area negative response if the option "TMSI reallocation in case of Location Update reject with cause #13 (roaming not allowed in Location Area) or #15 (no suitable cells in Location Area)" is applicable (see clause4.1.2.3). The new TMSI is forwarded together with the new LAI. They are kept in the UE/SIM on receipt of the Location Update reject with cause #13 or #15 (see 3GPP TS 24.008 [13]).

Sheet 2: IMEISV trace list shall be made available to the MSC. The list may contain IMEISV entries if Management Based Trace Activation is supported in RAN and MSC has received the trace list in the Uplink Information Transfer message (See 3GPP TS 32.422 [15] and 25.413 [17]). The test "Current IMEISV included in IMEISV trace list?" will follow the "no" case when no entries exist.

Sheet 2: For Trace Invocation in RAN concepts and procedures see 3GPP TSs 32.421 [16], 32.422[15] and 25.413[17].

Sheet 2: IMEISV trace list

Figure (sheet 1 of 2): Process Update_Location_Area_MSC

Figure (sheet 2 of 2): Process Update_Location_Area_MSC Procedure Authenticate_MSC

Figure (sheet 1 of 1): Procedure Authenticate_MSC