8.9 Relocation Complete

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

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

8.9.1 General

The purpose of the Relocation Complete procedure is to indicate to the CN the completion by the target RNC of the relocation of SRNS. The procedure shall be co-ordinated over all Iu signalling connections existing for the UE. The procedure uses connection-oriented signalling.

8.9.2 Successful Operation

Figure 10: Relocation Complete procedure. Successful operation.

When the new SRNC-ID and serving RNC Radio Network Temporary Identity are successfully exchanged with the UE by the radio protocols, the target RNC shall initiate the Relocation Complete procedure by sending a RELOCATION COMPLETE message to the CN. Upon reception of the RELOCATION COMPLETE message, the CN should stop the T_{RELOCcomplete} timer.

If the Higher bitrates than 16 Mbps flag IE is included in the RELOCATION COMPLETE message then the CN shall, if supported, use the IE as described in TS 23.060 [21].

If the Tunnel Information for BBF IE is received in the RELOCATION COMPLETE message, the CN shall, if supported, use the IE as described in TS 23.139 [65].

If the LHN ID IE is included in the RELOCATION COMPLETE message, the CN shall, if supported, use it as specified in TS 23.060 [21].

8.9.3 Abnormal Conditions

If the timer T_{RELOCcomplete} expires:

– The CN should initiate release of Iu connections towards the source and the target RNC by initiating the Iu Release procedure with an appropriate value for the Cause IE, e.g. "T_{RELOCcomplete} expiry".

Interactions with the Relocation Detect procedure:

If the RELOCATION DETECT message is not received by the CN before reception of the RELOCATION COMPLETE message, the CN shall handle the RELOCATION COMPLETE message normally.

8.9.4 Co-ordination of Two Iu Signalling Connections

When the Relocation Complete procedure is to be initiated by the target RNC, the target RNC shall initiate the Relocation Complete procedure on all Iu signalling connections existing for the UE between the target RNC and the CN.