specviewer.org TS 38.331 ASN.1 index SIB21-r17

SIB21 (SIB21-r17)

RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 6.3.1

SIB21-r17 is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v17.0.0 (2022-04) · Not changed since

Definition

SIB21 contains the mapping between the current and/or neighbouring carrier frequencies and MBS Frequency Selection Area Identities (FSAI).

SIB21-r17 ::= SEQUENCE {
    mbs-FSAI-IntraFreq-r17                   MBS-FSAI-List-r17                OPTIONAL,  -- Need R
    mbs-FSAI-InterFreqList-r17               MBS-FSAI-InterFreqList-r17       OPTIONAL,  -- Need R
    lateNonCriticalExtension                 OCTET STRING                     OPTIONAL,
    ...
}

Fields (3)

FieldDescription
mbs-FSAI-IntraFreq-r17
MBS-FSAI-List-r17 · OPTIONAL Need R
Contains the list of MBS FSAIs for the current frequency. For MBS service continuity, the UE shall use all MBS FSAIs listed in mbs-FSAI-IntraFreq to derive the MBS frequencies of interest.
mbs-FSAI-InterFreqList-r17
MBS-FSAI-InterFreqList-r17 · OPTIONAL Need R
Contains a list of neighboring frequencies including additional bands, if any, that provide MBS services and the corresponding MBS FSAIs.
lateNonCriticalExtension
OCTET STRING · OPTIONAL

Used by (1)

Uses (2)

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