MBSMulticastConfiguration (MBSMulticastConfiguration-r18)

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

MBSMulticastConfiguration-r18 is an RRC message of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v18.0.0 (2024-01) · Last changed v18.1.0 (2024-04), in MBSMulticastConfiguration-r18-IEs

Definition

The MBSMulticastConfiguration message contains the control information applicable for MBS multicast services transmitted via multicast MRBs for RRC_INACTIVE UEs.

MBSMulticastConfiguration-r18 ::= SEQUENCE {
    criticalExtensions                CHOICE {
        mbsMulticastConfiguration-r18     MBSMulticastConfiguration-r18-IEs,
        criticalExtensionsFuture          SEQUENCE {}
    }
}

Fields (3)

Field	Description
criticalExtensions CHOICE {
mbsMulticastConfiguration-r18 MBSMulticastConfiguration-r18-IEs
criticalExtensionsFuture SEQUENCE {}

Fields of MBSMulticastConfiguration-r18-IEs (8)

Field	Description
mbs-SessionInfoListMulticast-r18 MBS-SessionInfoListMulticast-r18 · OPTIONAL Need R since v18.1.0	Provides the configuration of MBS multicast session(s) in the current cell.
mbs-NeighbourCellList-r18 MBS-NeighbourCellList-r17 · OPTIONAL Need S	List of neighbour cells providing one or more MBS multicast services for RRC_INACTIVE that are provided by the current cell. This field is used by the UE together with mtch-NeighbourCell field signalled for each MBS session in the corresponding MBS-SessionInfo . When an empty mbs-NeighbourCellList list is signalled, the UE shall assume that MBS multicast services signalled in mbs-SessionInfoListMulticast in the MBSMulticastConfiguration message are not provided in any neighbour cell. When a non-empty mbs-NeighbourCellList is signalled, the current serving cell does not provide information about MBS multicast services of a neighbour cell that is not included in mbs-NeighbourCellList , i.e., the UE cannot determine the presence or absence of an MBS multicast service of a neighbour cell that is absent. When the field mbs-NeighbourCellList is absent, the current serving cell does not provide information about MBS multicast services in the neighbouring cells, i.e. the UE cannot determine the presence or absence of an MBS multicast service in neighbouring cells based on the absence of this field.
drx-ConfigPTM-List-r18 SEQUENCE (SIZE (1..maxNrofDRX-ConfigPTM-r17)) OF DRX-ConfigPTM-r17 · OPTIONAL Need R
pdsch-ConfigMTCH-r18 PDSCH-ConfigBroadcast-r17 · OPTIONAL Need S	Provides parameters for acquiring the PDSCH for multicast MTCH. When this field is absent, the UE shall use parameters in pdsch-ConfigMCCH in SIB24 to acquire the PDSCH for multicast MTCH.
mtch-SSB-MappingWindowList-r18 MTCH-SSB-MappingWindowList-r17 · OPTIONAL Need R
thresholdMBS-List-r18 SEQUENCE (SIZE (1..maxNrofThresholdMBS-r18)) OF ThresholdMBS-r18 · OPTIONAL Need R	List of reception quality thresholds for RRC connection resume for a UE receiving multicast in RRC_INACTIVE.
lateNonCriticalExtension OCTET STRING · OPTIONAL
nonCriticalExtension SEQUENCE {} · OPTIONAL

Used by (2)

Uses (1)

MBSMulticastConfiguration-r18-IEs