7.7.45A Additional RAB Setup Information

29.0603GPPGeneral Packet Radio Service (GPRS)GPRS Tunnelling Protocol (GTP) across the Gn and Gp interfaceRelease 17TS

If the target RNC successfully allocated resources associated with the NSAPI, the Additional RAB Setup Information IE contains the RNC Tunnel Endpoint Identifier and RNC IP address for data forwarding from source RNC to target RNC for IPv6. If the target RNC or the new SGSN failed to allocate resources the Additional RAB Setup Information IE contains only Length and NSAPI indicating that the source RNC shall release the resources associated with the NSAPI.

In the 3G Gn/Gp SGSN to MME combined hard handover and SRNS relocation procedure, if the indirect data forwarding is used, the target MME shall construct the Tunnel Endpoint Identifier and RNC IP address using the SGW Tunnel Endpoint Identifier and SGW IP address for data forwarding. If the direct data forwarding is used, the target MME shall construct the Tunnel Endpoint Identifier and RNC IP address using the eNodeB Tunnel Endpoint Identifier and eNodeB IP address for data forwarding. If the target eNodeB, target MME or the target SGW failed to allocate resources the RAB Setup Information IE contains only Length and NSAPI indicating that the source RNC shall release the resources associated with the NSAPI.The spare bits x indicate unused bits, which shall be set to 0 by the sending side and which shall not be evaluated by the receiving side.

The format of the RNC IPv6 address is the same as the GSN address as defined in 3GPP TS 23.003 [2]. The Address Type and Address Length fields from 3GPP TS 23.003 [2] are not included in the RNC IP Address field.

Figure 60a: Additional RAB Setup Information IE for data forwarding

Figure 60b: Additional RAB Setup Information IE for release of resources