8.1.17 ETWS primary notification with security procedure
25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS
Figure 8.1.17-1: ETWS primary notification with security
8.1.17.1 General
The ETWS primary notification with security procedure is used to transfer an ETWS primary notification to the UE. The ETWS PRIMARY NOTIFICATION WITH SECURITY message is received via the dedicated control channel (DCCH).
The UE may receive the ETWS PRIMARY NOTIFICATION WITH SECURITY message via DCCH, when the UE is in a state where it is configured to receive DCCH. The UTRAN may use this option to send an ETWS primary notification to the UE when RRC is configured from upper layers to receive the ETWS primary notification either. The UE behaviour is specified in subclause 8.1.17.4.
8.1.17.2 Initiation
The UTRAN may initiate the ETWS primary notification with security procedure towards UEs in connected mode CELL_DCH state by sending the ETWS PRIMARY NOTIFICATION WITH SECURITY message on DCCH using UM or AM RLC.
8.1.17.3 Void
8.1.17.4 Reception of the ETWS PRIMARY NOTIFICATION WITH SECURITY message
If the UE receives the ETWS PRIMARY NOTIFICATION WITH SECURITY message on DCCH, the ETWS capable UE shall:
1> forward the ETWS primary notification to upper layers as specified in subclause 8.1.17.5.
If the UE receives the ETWS PRIMARY NOTIFICATION WITH SECURITY message, an ETWS incapable UE shall ignore this message.
8.1.17.5 Forward of the ETWS primary notification to the upper layers
If the UE has received the ETWS PRIMARY NOTIFICATION WITH SECURITY message on DCCH, the ETWS capable UE shall:
1> forward the content of the IE "ETWS information" received in the ETWS PRIMARY NOTIFICATION WITH SECURITY message to upper layers.