8.49 Reroute NAS Request

25.4133GPPRelease 17TSUTRAN Iu interface Radio Access Network Application Part (RANAP) signalling

8.49.1 General

The purpose of the Reroute NAS Request procedure is to enable the SGSN (that can serve the UE in case of MOCN configuration) to request for a rerouting of the INITIAL UE message to the indicated DCN. The procedure uses connection oriented signalling.

8.49.2 Successful Operation

Figure 64: Reroute NAS Request procedure: Successful operation.

The SGSN initiates the procedure by sending a REROUTE NAS REQUEST message to the RNC. The RNC shall, if supported, reroute the INITIAL UE MESSAGE message to the DCN indicated by the SGSN Group Identity IE.

If the P-TMSI IE is included in the REROUTE NAS REQUEST message, then the RNC shall if supported, use it when selecting the SGSN node in the DCN as defined in TS 23.401 [48].

If the UE Usage Type IE is included in the REROUTE NAS REQUEST message, then the RNC shall if supported, include it towards the selected SGSN node in the DCN as defined in TS 23.401 [48].

8.49.3 Unsuccessful Operation

Not applicable.

8.49.4 Abnormal Conditions

Not applicable.