MeasurementTimingConfiguration

inter-node RRC message · TS 38.331 v19.4.0 (2026-09) · clause 11.2.2

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

First seen v15.1.0 (2018-04) · Last changed v16.1.0 (2020-07), in MeasurementTimingConfiguration-v1550-IEs

Definition

The MeasurementTimingConfiguration message is used to convey assistance information for measurement timing and to indicate which neighbour cell SSB is CD-SSB. The other indicated SSB can be considered as the NCD-SSB in use.

MeasurementTimingConfiguration ::=      SEQUENCE {
    criticalExtensions                      CHOICE {
        c1                                      CHOICE{
            measTimingConf                          MeasurementTimingConfiguration-IEs,
            spare3 NULL, spare2 NULL, spare1 NULL
        },
        criticalExtensionsFuture        SEQUENCE {}
    }
}

Fields (7)

Field	Description
criticalExtensions CHOICE {
c1 CHOICE{
measTimingConf MeasurementTimingConfiguration-IEs
spare3 NULL
spare2 NULL
spare1 NULL
criticalExtensionsFuture SEQUENCE {}

Fields of MeasurementTimingConfiguration-IEs (2)

Field	Description
measTiming MeasTimingList · OPTIONAL	A list of SMTC information, SSB RSSI measurement information and associated NR frequency exchanged via EN-DC X2 Setup, EN-DC Configuration Update, Xn Setup and NG-RAN Node Configuration Update procedures, or F1 messages between gNB DU and gNB CU.
nonCriticalExtension MeasurementTimingConfiguration-v1550-IEs · OPTIONAL

Fields of MeasurementTimingConfiguration-v1550-IEs (3)

Field	Description
campOnFirstSSB BOOLEAN since v15.5.0	Value true indicates that the SSB indicated in the first instance of MeasTiming in the measTiming list can be used for camping and for a PCell configuration (i.e. in spCellConfigCommon of the masterCellGroup ) and to indicate which neighbour cell SSB is CD-SSB and which one is NCD-SSB in use.
psCellOnlyOnFirstSSB BOOLEAN since v15.5.0	Value true indicates that only the SSB indicated in the first instance of MeasTiming in the measTiming list can be used for a PSCell configuration (i.e. in spCellConfigCommon of the secondaryCellGroup ).
nonCriticalExtension MeasurementTimingConfiguration-v1610-IEs · OPTIONAL since v15.5.0

Fields of MeasurementTimingConfiguration-v1610-IEs (5)

Field	Description
csi-RS-Config-r16 SEQUENCE { since v16.1.0
csi-RS-SubcarrierSpacing-r16 SubcarrierSpacing since v16.1.0	Indicates the subcarrier spacing of the CSI-RS resources included in csi-rs-CellMobility .
csi-RS-CellMobility-r16 CSI-RS-CellMobility since v16.1.0	Indicates the CSI-RS configuration of the cell for which this message is included. The timing of the CSI-RS resources is based on the SSB indicated by refSSBFreq .
refSSBFreq-r16 ARFCN-ValueNR since v16.1.0
nonCriticalExtension SEQUENCE {} · OPTIONAL since v16.1.0

Uses (1)

MeasurementTimingConfiguration-IEs