5.10 Handling of Source information transfer to Target

25.4673GPPRelease 17Stage 2TSUTRAN architecture for 3G Home Node B (HNB)

In order to maintain the continuity of UE support during RNSAP Relocation, information must be transferred from the Source HNB to the Target HNB. RAB related information to ensure that continuity of User Plane and RAB establishment and other non-RAB related information is transferred in the RELOCATION COMMIT message.

5.10.1 RAB Related Parameters

5.10.1.1 User Plane

During RNSAP Relocation preparation phase, information is provided to the Target HNB in order to allow forwarding of user data. For each CS RAB operated in support mode (see TS 25.415 [17] for the definition of “support mode”) IuUP protocol data is provided to establish a respective IuUP instance at the Target HNB in a way that the CN is unaware of the RNSAP Relocation.

During the RNSAP Relocation execution phase, for each CS RAB operated in support mode, final counters of IuUP user data and control data frames are provided.

The behaviour of all involved nodes (Source HNB, Target HNB, HNB-GW) is fully specified in subclause 5.7.2.2.

5.10.1.2 Other parameters

During Relocation Commit the following information is transferred from the Source HNB to the Target HNB to maintain valid data volume reports.

RAB Data Volume Information, The unsuccessful data report transferred to the target to be accumulated at the target for the final Data Volume report on RAB release.

5.10.2 Non-RAB Related Parameters

During Relocation Commit the following information is transferred from the Source HNB to the Target HNB to continue non-RAB related functionality triggered at the Source HNB:

– Location Reporting parameters are transferred to the Target HNB to ensure continuity of Location Reporting.

– Trace Information parameters are transferred to the Target HNB to ensure continuity of Trace operations.

– The Service Area ID of the source cell is transferred to the target to enable the Target HNB to detect a change of service area and report this in the Location Reporting procedures.