RRCRelease

RRC message · TS 38.331 v19.4.0 (2026-09) · clause 6.2.2

RRCRelease is an RRC message of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v15.3.0 (2018-09) · Last changed v17.1.0 (2022-07), in RRCRelease-v1650-IEs

Definition

The RRCRelease message is used to command the release of an RRC connection or the suspension of the RRC connection.

RRCRelease ::=                      SEQUENCE {
    rrc-TransactionIdentifier           RRC-TransactionIdentifier,
    criticalExtensions                  CHOICE {
        rrcRelease                          RRCRelease-IEs,
        criticalExtensionsFuture            SEQUENCE {}
    }
}

Fields (4)

Field	Description
rrc-TransactionIdentifier RRC-TransactionIdentifier
criticalExtensions CHOICE {
rrcRelease RRCRelease-IEs
criticalExtensionsFuture SEQUENCE {}

Fields of RRCRelease-IEs (8)

Field	Description
redirectedCarrierInfo RedirectedCarrierInfo · OPTIONAL Need N	Indicates a carrier frequency (downlink for FDD) and is used to redirect the UE to an NR or an inter-RAT carrier frequency, by means of cell selection at transition to RRC_IDLE or RRC_INACTIVE as specified in TS 38.304 [20]. Based on UE capability, the network may include redirectedCarrierInfo in RRCRelease message with suspendConfig if this message is sent in response to an RRCResumeRequest or an RRCResumeRequest1 which is triggered by the NAS layer (see 5.3.1.4 in TS 24.501 [23]). For redirection from TN to NTN, nr-v1900 is used. For redirection from NTN to NTN, nr (without suffix) or nr-v1900 can be used.
cellReselectionPriorities CellReselectionPriorities · OPTIONAL Need R	Dedicated priorities to be used for cell reselection as specified in TS 38.304 [20] . The maximum number of NR carrier frequencies that the network can configure through FreqPriorityListNR and FreqPriorityListDedicatedSlicing together is eight. If the same frequency is configured in both FreqPriorityListNR and FreqPriorityListDedicatedSlicing , the frequency is only counted once.
suspendConfig SuspendConfig · OPTIONAL Need R	Indicates configuration for the RRC_INACTIVE state. The network does not configure suspendConfig when the network redirect the UE to an inter-RAT carrier frequency or if the UE is configured with a DAPS bearer.
deprioritisationReq SEQUENCE { · OPTIONAL Need N	Indicates whether the current frequency or RAT is to be de-prioritised.
deprioritisationType ENUMERATED {frequency, nr}
deprioritisationTimer ENUMERATED {min5, min10, min15, min30}	Indicates the value for timer T325 (see clause 5.3.8.3 and TS 38.304 [20]). Value minN corresponds to N minutes.
lateNonCriticalExtension OCTET STRING · OPTIONAL
nonCriticalExtension RRCRelease-v1540-IEs · OPTIONAL

Fields of RRCRelease-v1540-IEs (2)

Field	Description
waitTime RejectWaitTime · OPTIONAL Need N since v15.4.0
nonCriticalExtension RRCRelease-v1610-IEs · OPTIONAL since v15.4.0

Fields of RRCRelease-v1610-IEs (3)

Field	Description
voiceFallbackIndication-r16 ENUMERATED {true} · OPTIONAL Need N since v16.1.0	Indicates the RRC release is triggered by EPS fallback for IMS voice as specified in TS 23.502 [43].
measIdleConfig-r16 SetupRelease {MeasIdleConfigDedicated-r16} · OPTIONAL Need M since v16.1.0	Indicates measurement configuration to be stored and used by the UE while in RRC_IDLE or RRC_INACTIVE.
nonCriticalExtension RRCRelease-v1650-IEs · OPTIONAL since v16.1.0

Fields of RRCRelease-v1650-IEs (2)

Field	Description
mpsPriorityIndication-r16 ENUMERATED {true} · OPTIONAL Cond Redirection2 since v16.5.0	Indicates the UE can set the establishment cause to mps-PriorityAccess for a new connection following a redirect to NR or set the resume cause to mps-PriorityAccess for a resume following a redirect to NR. If the target RAT is E-UTRA, see TS 36.331 [10]. The gNB sets the indication only for UEs authorized to receive MPS treatment as indicated by ARP and/or QoS characteristics at the gNB, and it is applicable only for this instance of release with redirection to carrier/RAT included in the redirectedCarrierInfo field in the RRCRelease message.
nonCriticalExtension RRCRelease-v1710-IEs · OPTIONAL since v16.5.0

Field

Description

mpsPriorityIndication-r16

ENUMERATED {true} · OPTIONAL Cond Redirection2

since v16.5.0

Indicates the UE can set the establishment cause to mps-PriorityAccess for a new connection following a redirect to NR or set the resume cause to mps-PriorityAccess for a resume following a redirect to NR. If the target RAT is E-UTRA, see TS 36.331 [10]. The gNB sets the indication only for UEs authorized to receive MPS treatment as indicated by ARP and/or QoS characteristics at the gNB, and it is applicable only for this instance of release with redirection to carrier/RAT included in the redirectedCarrierInfo field in the RRCRelease message.

nonCriticalExtension

RRCRelease-v1710-IEs · OPTIONAL