MobilityFromNRCommand

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

MobilityFromNRCommand 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 v18.2.0 (2024-07), in MobilityFromNRCommand-v1610-IEs

Definition

The MobilityFromNRCommand message is used to command handover from NR to E-UTRA/EPC, E-UTRA/5GC or UTRA-FDD.

MobilityFromNRCommand ::=           SEQUENCE {
    rrc-TransactionIdentifier           RRC-TransactionIdentifier,
    criticalExtensions                  CHOICE {
        mobilityFromNRCommand           MobilityFromNRCommand-IEs,
        criticalExtensionsFuture        SEQUENCE {}
    }
}

Fields (4)

Field	Description
rrc-TransactionIdentifier RRC-TransactionIdentifier
criticalExtensions CHOICE {
mobilityFromNRCommand MobilityFromNRCommand-IEs
criticalExtensionsFuture SEQUENCE {}

Fields of MobilityFromNRCommand-IEs (5)

Field	Description
targetRAT-Type ENUMERATED { eutra, utra-fdd-v1610, spare2, spare1, ...}	Indicates the target RAT type.
targetRAT-MessageContainer OCTET STRING	The field contains a message specified in another standard, as indicated by the targetRAT-Type , and carries information about the target cell identifier(s) and radio parameters relevant for the target radio access technology. A complete message is included, as specified in the other standard. See NOTE 1
nas-SecurityParamFromNR OCTET STRING · OPTIONAL Cond HO-ToEPCUTRAN	If targetRAT-Type is eutra , this field is used to deliver the key synchronisation and Key freshness for the NR to LTE/EPC handovers and a part of the downlink NAS COUNT as specified in TS 33.501 [11] and the content of the parameter is defined in TS 24.501 [23]. If targetRAT-Type is utra-fdd , this field is used to deliver the key synchronisation and Key freshness for the NR to FDD UTRAN handover and a part of the downlink NAS COUNT as specified in TS 33.501 [11] and the content of the parameter is defined in TS 24.501 [23].
lateNonCriticalExtension OCTET STRING · OPTIONAL
nonCriticalExtension MobilityFromNRCommand-v1610-IEs · OPTIONAL

Fields of MobilityFromNRCommand-v1610-IEs (2)

Field	Description
voiceFallbackIndication-r16 ENUMERATED {true} · OPTIONAL Need N since v16.1.0	Indicates the handover is triggered by EPS fallback for IMS voice as specified in TS 23.502 [43].
nonCriticalExtension SEQUENCE {} · OPTIONAL since v16.1.0

Used by (1)

DL-DCCH-MessageType