8.1.7 Intra-MSC enhanced SRNS Relocation with Iu on IP

23.2053GPPBearer-independent circuit-switched core networkRelease 17Stage 2TS

If IuCS on IP is supported by the MSC server, the Core Network side procedures described in 8.1.x shall apply. For the access bearer termination, the exchange of IP addresses via call control procedures as described in 8.1.5 applies with the following exception. The Prepare_IP_Transport procedure is used after the MSC Server receives the RANAP Enhanced Relocation Complete Request. If the bearer transport is IP and IuUP mode is Transparent, when the MSC Server receives the RANAP Enhanced Relocation Complete Response, it shall send the RNC IP address and UDP Port to the MGW Access bearer termination using the Modify_IP_Transport_Address procedure.

The sequence is shown in figure 8.7/1.

Figure 8.1.7/1 Enhanced SRNS Relocation with Iu on IP