specviewer.org TS 38.331 ASN.1 index RadioLinkMonitoringConfig

RadioLinkMonitoringConfig

RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 6.3.2

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

First seen v15.1.0 (2018-04) · Last changed v17.4.0 (2023-03)

Definition

The IE RadioLinkMonitoringConfig is used to configure radio link monitoring for detection of beam- and/or cell radio link failure. See also TS 38.321 [3], clause 5.1.1.

RadioLinkMonitoringConfig ::=       SEQUENCE {
    failureDetectionResourcesToAddModList   SEQUENCE (SIZE(1..maxNrofFailureDetectionResources)) OF RadioLinkMonitoringRS
    OPTIONAL, -- Need N
    failureDetectionResourcesToReleaseList  SEQUENCE (SIZE(1..maxNrofFailureDetectionResources)) OF RadioLinkMonitoringRS-Id
    OPTIONAL, -- Need N
    beamFailureInstanceMaxCount             ENUMERATED {n1, n2, n3, n4, n5, n6, n8, n10}                          OPTIONAL, -- Need R
    beamFailureDetectionTimer               ENUMERATED {pbfd1, pbfd2, pbfd3, pbfd4, pbfd5, pbfd6, pbfd8, pbfd10}  OPTIONAL, -- Need R
    ...,
    [[
        beamFailure-r17                         BeamFailureDetection-r17                                              OPTIONAL  -- Need R
    ]]
}

Candidate change requests of v17.4.0

The CRs whose title or cover names this change, strong and likely matches only.

Fields (5)

FieldDescription
failureDetectionResourcesToAddModList
SEQUENCE (SIZE(1..maxNrofFailureDetectionResources)) OF RadioLinkMonitoringRS · OPTIONAL Need N
since v15.2.0
A list of reference signals for detecting beam failure and/or cell level radio link failure (RLF). The limits of the reference signals that the network can configure are specified in TS 38.213 [13], table 5-1. The network configures at most two detectionResources per BWP for the purpose beamFailure or both . If no RSs are provided for the purpose of beam failure detection, the UE performs beam monitoring based on the activated TCI-State for PDCCH as described in TS 38.213 [13], clause 6. If no RSs are provided in this list for the purpose of RLF detection, the UE performs Cell-RLM based on the activated TCI-State of PDCCH as described in TS 38.213 [13], clause 5. The network ensures that the UE has a suitable set of reference signals for performing cell-RLM. If failureDetectionSet1-r17 and failureDetectionSet2-r17 are present, the purpose of RadioLinkMonitoringRS in failureDetectionResourcesToAddModList only can be set to rlf .
failureDetectionResourcesToReleaseList
SEQUENCE (SIZE(1..maxNrofFailureDetectionResources)) OF RadioLinkMonitoringRS-Id · OPTIONAL Need N
since v15.2.0
beamFailureInstanceMaxCount
ENUMERATED {n1, n2, n3, n4, n5, n6, n8, n10} · OPTIONAL Need R
This field determines after how many beam failure events the UE triggers beam failure recovery (see TS 38.321 [3], clause 5.17). Value n1 corresponds to 1 beam failure instance, value n2 corresponds to 2 beam failure instances and so on.
beamFailureDetectionTimer
ENUMERATED {pbfd1, pbfd2, pbfd3, pbfd4, pbfd5, pbfd6, pbfd8, pbfd10} · OPTIONAL Need R
Timer for beam failure detection (see TS 38.321 [3], clause 5.17). See also the BeamFailureRecoveryConfig IE. Value in number of "Q out,LR reporting periods of Beam Failure Detection" Reference Signal (see TS 38.213 [13], clause 6). Value pbfd1 corresponds to 1 Q out,LR reporting period of Beam Failure Detection Reference Signal, value pbfd2 corresponds to 2 Q out,LR reporting periods of Beam Failure Detection Reference Signal and so on.
beamFailure-r17
BeamFailureDetection-r17 · OPTIONAL Need R
since v17.4.0

Used by (1)

Uses (4)

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