8.3.20 Radio Link Activation

25.4233GPPRelease 17TSUTRAN Iur interface Radio Network Subsystem Application Part (RNSAP) signalling

8.3.20.1 General

This procedure is used to activate or de-activate the DL transmission on the Uu interface regarding selected RLs.

8.3.20.2 Successful Operation

Figure 26D: Radio Link Activation procedure

This procedure is initiated by sending the RADIO LINK ACTIVATION COMMAND message from the SRNC to the DRNC. This procedure shall use the signalling bearer connection for the relevant UE Context.

Upon receipt, the DRNS shall for each concerned RL:

– if the Delayed Activation Update IE indicates “Activate”:

– if the Activation Type IE equals “Unsynchronised”:

– [FDD – start transmission on the new RL after synchronisation is achieved in the DL user plane as specified in TS 25.427 [4].]

– [TDD – start transmission on the new RL immediately as specified in TS 25.427 [4].]

– if the Activation Type IE equals “Synchronised”:

– [FDD – start transmission on the new RL after synchronisation is achieved in the DL user plane as specified in TS 25.427 [4], however never before the CFN indicated in the Activation CFN IE.]

– [TDD – start transmission on the new RL at the CFN indicated in the Activation CFN IE as specified in TS 25.427 [4].]

– [FDD – the DRNS shall apply the power level indicated in the Initial DL Tx Power IE to the transmission on each DL DPCH or on the F-DPCH of the RL when starting transmission until either UL synchronisation on the Uu interface is achieved for the RLS or power balancing is activated. During this period no inner loop power control shall be performed and, unless activated by the DL POWER CONTROL REQUEST message, no power balancing shall be performed. The DL power shall then vary according to the inner loop power control (see TS 25.214 [10], subclause 5.2.1.2) and downlink power balancing adjustments (see 8.3.7).]

– [TDD – the DRNS shall apply the power level indicated in the Initial DL Tx Power IE to the transmission on each DL DPCH and on each Time Slot of the RL when starting transmission until the UL synchronisation on the Uu interface is achieved for the RL. No inner loop power control shall be performed during this period. The DL power shall then vary according to the inner loop power control (see TS 25.224 [22], subclause 4.2.3.3).]

– [FDD – if the Propagation Delay IE and optionally the Extended Propagation Delay IE are included, the DRNS may use this information to speed up the detection of UL synchronisation on the Uu interface.]

– [FDD – if the First RLS Indicator IE is included, it indicates if the concerned RL shall be considered part of the first RLS established towards this UE. The First RLS Indicator IE shall be used by the DRNS to determine the initial TPC pattern in the DL of the concerned RL and all RLs which are part of the same RLS, as described in TS 25.214 [10], section 5.1.2.2.1.2.]

– if the Delayed Activation Update IE indicates “Deactivate”:

– stop DL transmission immediately if the Deactivation Type IE equals “Unsynchronised”, or at the CFN indicated by the Deactivation CFN IE if the Deactivation Type IE equals “Synchronised”.

8.3.20.3 Abnormal Conditions

[FDD – If the Delayed Activation Update IE is included in the RADIO LINK ACTIVATION COMMAND message, it indicates “Activate” and the First RLS Indicator IE is not included, the DRNC shall initiate the ERROR INDICATION procedure.]