Question: What triggers the UE to release the RLC entity and the corresponding logical channel associated with a specific SL-RLC-ChannelID in PC5 Relay operation?
Option 1: Receiving an RRCReconfigurationSidelink message or an RRCReconfigurationCompleteSidelink message, if the PC5 Relay RLC channel release was triggered due to the configuration received within the sl-ConfigDedicatedNR.
Option 2: Upper layers specifying a specific destination for sidelink communication as specified in 5.8.9.5 or 5.8.9.10.4.
Option 3: The UE detecting sidelink Radio Link Failure (RLF) as specified in 5.8.9.3.
Option 4: The UE receiving a sl-RLC-ChannelToReleaseListPC5 message with the SL-RLC-ChannelID to be released.
Explanation: According to the 3GPP TS 38.331 specification, the UE shall release the RLC entity and the corresponding logical channel associated with a specific SL-RLC-ChannelID if the PC5 Relay RLC channel release was triggered after receiving an RRCReconfigurationSidelink message or an RRCReconfigurationCompleteSidelink message, if the PC5 Relay RLC channel release was triggered due to the configuration received within the sl-ConfigDedicatedNR.