RRCReconfigurationSidelink

PC5-RRC message · TS 38.331 v19.4.0 (2026-09) · clause 6.6.2

RRCReconfigurationSidelink is a PC5-RRC message of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v16.0.0 (2020-04) · Last changed v18.6.0 (2025-06), in RRCReconfigurationSidelink-v1800-IEs

Definition

The RRCReconfigurationSidelink message is the command to AS configuration of the PC5 RRC connection. It is only applied to unicast of NR sidelink communication.

RRCReconfigurationSidelink ::=          SEQUENCE {
    rrc-TransactionIdentifier-r16           RRC-TransactionIdentifier,
    criticalExtensions                      CHOICE {
        rrcReconfigurationSidelink-r16          RRCReconfigurationSidelink-r16-IEs,
        criticalExtensionsFuture                SEQUENCE {}
    }
}

Candidate change requests of v18.6.0

The CRs whose title or cover names this change, strong and likely matches only.

CR 5375 r1 (strong): Correction on terminology of local ID pair list

Fields (4)

Field	Description
rrc-TransactionIdentifier-r16 RRC-TransactionIdentifier
criticalExtensions CHOICE {
rrcReconfigurationSidelink-r16 RRCReconfigurationSidelink-r16-IEs
criticalExtensionsFuture SEQUENCE {}

Fields of RRCReconfigurationSidelink-r16-IEs (8)

Field	Description
slrb-ConfigToAddModList-r16 SEQUENCE (SIZE (1..maxNrofSLRB-r16)) OF SLRB-Config-r16 · OPTIONAL Need N since v16.9.0
slrb-ConfigToReleaseList-r16 SEQUENCE (SIZE (1..maxNrofSLRB-r16)) OF SLRB-PC5-ConfigIndex-r16 · OPTIONAL Need N since v16.9.0
sl-MeasConfig-r16 SetupRelease {SL-MeasConfig-r16} · OPTIONAL Need M since v16.9.0	Indicates the sidelink measurement configuration for the unicast destination.
sl-CSI-RS-Config-r16 SetupRelease {SL-CSI-RS-Config-r16} · OPTIONAL Need M since v16.9.0
sl-ResetConfig-r16 ENUMERATED {true} · OPTIONAL Need N since v16.9.0
sl-LatencyBoundCSI-Report-r16 INTEGER (3..160) · OPTIONAL Need M since v16.9.0	Indicates the latency bound of SL CSI report from the associated SL CSI triggering in terms of number of slots.
lateNonCriticalExtension OCTET STRING · OPTIONAL since v16.9.0
nonCriticalExtension RRCReconfigurationSidelink-v1700-IEs · OPTIONAL since v16.9.0

Fields of RRCReconfigurationSidelink-v1700-IEs (5)

Field	Description
sl-DRX-ConfigUC-PC5-r17 SetupRelease { SL-DRX-ConfigUC-r17 } · OPTIONAL Need M since v17.0.0	Indicates the NR sidelink DRX configuration for unicast communication, as specified in TS 38.321 [3]
sl-LatencyBoundIUC-Report-r17 SetupRelease { SL-LatencyBoundIUC-Report-r17 } · OPTIONAL Need M since v17.0.0	Indicates the latency bound of SL Inter-UE coordination report from the associated SL Inter-UE coordination explicit request triggering in terms of number of slots.
sl-RLC-ChannelToReleaseListPC5-r17 SEQUENCE (SIZE (1..maxSL-LCID-r16)) OF SL-RLC-ChannelID-r17 · OPTIONAL Need N since v17.1.0
sl-RLC-ChannelToAddModListPC5-r17 SEQUENCE (SIZE (1..maxSL-LCID-r16)) OF SL-RLC-ChannelConfigPC5-r17 · OPTIONAL Need N since v17.1.0
nonCriticalExtension RRCReconfigurationSidelink-v1800-IEs · OPTIONAL since v17.0.0

Fields of RRCReconfigurationSidelink-v1800-IEs (7)

Field	Description
sl-SFN-DFN-Offset-r18 SetupRelease { SL-SFN-DFN-Offset-r18 } · OPTIONAL Need M since v18.0.0	Indicates the SFN-DFN offset to be used for determining the SFN timeline based on the DFN timeline.
sl-CarrierToAddModList-r18 SEQUENCE (SIZE (1..maxNrofFreqSL-1-r18)) OF SL-CarrierConfig-r18 · OPTIONAL Need N since v18.0.0	Indicate the carrier(s) to be added/modified for transmission by UE transmitting RRCReconfigurationSidelink message, corresponding to the frequency in sl-FreqInfoListSizeExt broadcast in SIB12 or corresponding to the frequency in sl-PreconfigFreqInfoListSizeExt in SL-PreconfigurationNR .
sl-CarrierToReleaseList-r18 SEQUENCE (SIZE (1..maxNrofFreqSL-1-r18)) OF SL-CarrierId-r18 · OPTIONAL Need N since v18.0.0	Indicate the carrier(s) to be released for the transmission by UE transmitting RRCReconfigurationSidelink message.
sl-RLC-BearerToAddModList-r18 SEQUENCE (SIZE(1..maxNrofSLRB-r16)) OF SL-RLC-BearerConfig-r18 · OPTIONAL Need N since v18.0.0	Indicate the additional Sidelink RLC bearer to be added / modified for the configured sidelink SRB/DRB.
sl-RLC-BearerToReleaseList-r18 SEQUENCE (SIZE(1..maxNrofSLRB-r16)) OF SL-RLC-BearerConfigIndex-r18 · OPTIONAL Need N since v18.0.0	Indicate the additional Sidelink RLC bearer to be released for the configured sidelink SRB/DRB.
sl-LocalID-PairList-r18 SEQUENCE (SIZE (1..maxNrofSL-Dest-r16)) OF SL-SRAP-ConfigPC5-r18 · OPTIONAL Need N since v18.6.0	Indicate a list of local ID pair which is assigned for one end-to-end PC5 connection by the L2 U2U Relay UE.
nonCriticalExtension SEQUENCE {} · OPTIONAL since v18.0.0

Used by (1)

SCCH-MessageType