Section: 5.8.9.3 Sidelink radio link failure related actions
Content: The UE shall: 1> upon indication from sidelink RLC entity that the maximum number of retransmissions for a specific destination has been reached; or 1> upon T400 expiry for a specific destination; or 1> upon indication from MAC entity that the maximum number of consecutive HARQ DTX for a specific destination has been reached; or 1> upon integrity check failure indication from sidelink PDCP entity concerning SL-SRB2 or SL-SRB3 for a specific destination; or 1> upon indication of consistent sidelink LBT failures for all RB sets for a specific destination from MAC entity; or 1> upon reception of NotificationMessageSidelink indicating PC5 RLF from the L2 U2U Relay UE for a specific destination based on the received sl-DestinationIdentity: 2> consider sidelink radio link failure to be detected for this destination; 2> release the DRBs of this destination, according to clause 5.8.9.1a.1; 2> release the SRBs of this destination, according to clause 5.8.9.1a.3; 2> release the PC5 Relay RLC channels of this destination if configured, in according to clause 5.8.9.7.1; 2> discard the NR sidelink communication related configuration of this destination; 2> reset the sidelink specific MAC of this destination, except for L2 U2U Relay operation; 2> consider the PC5-RRC connection is released for the destination; 2> indicate the release of the PC5-RRC connection to the upper layers for this destination (i.e. PC5 is unavailable); 2> if UE is in RRC_CONNECTED: 3> if the UE is acting as L2 U2N Remote UE for the destination: 4> initiate the RRC connection re-establishment procedure as specified in 5.3.7. 3> else: 4> perform the sidelink UE information for NR sidelink communication procedure, as specified in 5.8.3.3; Editor's Note: FFS whether additional procedure for L2 U2U PC5 RLF initiation. NOTE: It is up to UE implementation on whether and how to indicate to upper layers to maintain the keep-alive procedure [55].