Section: 5.8.9.1a.1 Sidelink DRB release
Content: 5.8.9.1a.1.1 Sidelink DRB release conditions For NR sidelink communication, a sidelink DRB release is initiated in the following cases: 1> for groupcast, broadcast and unicast, if slrb-Uu-ConfigIndex (if any) of the sidelink DRB is included in sl-RadioBearerToReleaseList in sl-ConfigDedicatedNR; or 1> for groupcast and broadcast, if no sidelink QoS flow with data indicated by upper layers is mapped to the sidelink DRB for transmission, which is (re)configured by receiving SIB12 or SidelinkPreconfigNR; or 1> for groupcast, broadcast and unicast, if SL-RLC-BearerConfigIndex (if any) of the associated RLC entity(ies) (i.e., including the additional sidelink RLC bearer if applicable) for the sidelink DRB is included in sl-RLC-BearerToReleaseList/sl-RLC-BearerToReleaseListSizeExt in sl-ConfigDedicatedNR; or 1> for unicast, if no sidelink QoS flow with data indicated by upper layers is mapped to the sidelink DRB for transmission, which is (re)configured by receiving SIB12 or SidelinkPreconfigNR, and if no sidelink QoS flow mapped to the sidelink DRB, which is (re)configured by receiving RRCReconfigurationSidelink, has data; or 1> for unicast, if SLRB-PC5-ConfigIndex (if any) of the sidelink DRB is included in slrb-ConfigToReleaseList in RRCReconfigurationSidelink or if sl-ResetConfig is included in RRCReconfigurationSidelink; or 1> for unicast, when the corresponding PC5-RRC connection is released due to sidelink RLF being detected, according to clause 5.8.9.3; or 1> for unicast, when the corresponding PC5-RRC connection is released due to upper layer request according to clause 5.8.9.5. 5.8.9.1a.1.2 Sidelink DRB release operations For each sidelink DRB, whose sidelink DRB release conditions are met as in clause 5.8.9.1a.1.1, the UE capable of NR sidelink communication that is configured by upper layers to perform NR sidelink communication shall: 1> for groupcast and broadcast; or 1> for unicast, if the sidelink DRB release was triggered after the reception of the RRCReconfigurationSidelink message; or 1> for unicast, after receiving the RRCReconfigurationCompleteSidelink message, if the sidelink DRB release was triggered due to the configuration received within the sl-ConfigDedicatedNR, SIB12, SidelinkPreconfigNR or indicated by upper layers: 2> release the PDCP entity for NR sidelink communication associated with the sidelink DRB; 2> if SDAP entity for NR sidelink communication associated with this sidelink DRB is configured: 3> indicate the release of the sidelink DRB to the SDAP entity associated with this sidelink DRB (TS 37.324[ Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Service Data Adaptation Protocol (SDAP) specification ]  [24], clause 5.3.3); 2> release SDAP entities for NR sidelink communication, if any, that have no associated sidelink DRB as specified in TS 37.324[ Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Service Data Adaptation Protocol (SDAP) specification ]  [24] clause 5.1.2; 1> for groupcast and broadcast; or 1> for unicast, after receiving the RRCReconfigurationCompleteSidelink message, if the sidelink DRB release was triggered due to the configuration received within the sl-ConfigDedicatedNR: 2> for each sl-RLC-BearerConfigIndex included in the received sl-RLC-BearerToReleaseList/sl-RLC-BearerToReleaseListSizeExt that is part of the current UE sidelink configuration: 3> release the RLC entity and the corresponding logical channel for NR sidelink communication, associated with the sl-RLC-BearerConfigIndex. 1> for unicast, if the sidelink DRB release was triggered due to the reception of the RRCReconfigurationSidelink message; or 1> for unicast, after receiving the RRCReconfigurationCompleteSidelink message, if the sidelink DRB release was triggered due to the configuration received within the SIB12, SidelinkPreconfigNR or indicated by upper layers: 2> release the RLC entity and the corresponding logical channel for NR sidelink communication associated with the sidelink DRB; 2> perform the sidelink UE information procedure in clause 5.8.3 for unicast if needed. 1> if the sidelink radio link failure is detected for a specific destination: 2> release the PDCP entity, RLC entity and the logical channel of the sidelink DRB for the specific destination. Editor's Note: FFS on how to release SL DRB on E2E and hop configuration for U2U relay.