LTM-Candidate (LTM-Candidate-r18)

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

LTM-Candidate-r18 is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v18.0.0 (2024-01) · Last changed v19.1.0 (2026-01)

Definition

The IE LTM-Candidate concerns a LTM candidate configuration to add or modify.

LTM-Candidate-r18 ::=     SEQUENCE {
    ltm-CandidateId-r18                            LTM-CandidateId-r18,
    ltm-CandidatePCI-r18                           PhysCellId                                            OPTIONAL,    -- Need M
    ltm-SSB-Config-r18                             LTM-SSB-Config-r18                                    OPTIONAL,    -- Need M
    ltm-CandidateConfig-r18                        OCTET STRING (CONTAINING RRCReconfiguration)          OPTIONAL,    -- Need M
    ltm-ConfigComplete-r18                         ENUMERATED {true}                                     OPTIONAL,    -- Need R
    ltm-EarlyUL-SyncConfig-r18                     OCTET STRING (CONTAINING EarlyUL-SyncConfig-r18)      OPTIONAL,    -- Need R
    ltm-EarlyUL-SyncConfigSUL-r18                  OCTET STRING (CONTAINING EarlyUL-SyncConfig-r18)      OPTIONAL,    -- Need R
    ltm-TCI-Info-r18                               LTM-TCI-Info-r18                                      OPTIONAL,    -- Need M
    ltm-NoResetID-r18                              INTEGER (1..maxNrofLTM-Configs-plus1-r18)             OPTIONAL,    -- Need M
    ltm-UE-MeasuredTA-ID-r18                       INTEGER (1..maxNrofLTM-Configs-plus1-r18)             OPTIONAL,    -- Need M
    ...,
    [[
        ltm-NoSecurityChangeID-r19                     LTM-NoSecurityChangeId-r19                            OPTIONAL,    -- Need M
        ltm-ExecutionCondition-r19                     SetupRelease {LTM-ExecutionConditionList-r19}         OPTIONAL,    -- Need M
        ltm-NZP-CSI-RS-ResourceToAddModList-r19        SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-Resources)) OF NZP-CSI-RS-Resource
        OPTIONAL,    -- Need N
        ltm-NZP-CSI-RS-ResourceToReleaseList-r19       SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-Resources)) OF NZP-CSI-RS-ResourceId
        OPTIONAL,    -- Need N
        ltm-NZP-CSI-RS-ResourceSetToAddModList-r19     SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourceSets)) OF NZP-CSI-RS-ResourceSet
        OPTIONAL,    -- Need N
        ltm-NZP-CSI-RS-ResourceSetToReleaseList-r19    SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourceSets)) OF NZP-CSI-RS-ResourceSetId
        OPTIONAL,    -- Need N
        ltm-CSI-ReportConfig-r19                       SetupRelease {LTM-CSI-ReportConfig-r18}               OPTIONAL,    -- Need M
        ltm-CSI-IM-ResourceToAddModList-r19            SEQUENCE (SIZE (1..maxNrofCSI-IM-Resources)) OF CSI-IM-Resource
        OPTIONAL,    -- Need N
        ltm-CSI-IM-ResourceToReleaseList-r19           SEQUENCE (SIZE (1..maxNrofCSI-IM-Resources)) OF CSI-IM-ResourceId
        OPTIONAL,    -- Need N
        ltm-CSI-IM-ResourceSetToAddModList-r19         SEQUENCE (SIZE (1..maxNrofCSI-IM-ResourceSets)) OF CSI-IM-ResourceSet
        OPTIONAL,    -- Need N
        ltm-CSI-IM-ResourceSetToReleaseList-r19        SEQUENCE (SIZE (1..maxNrofCSI-IM-ResourceSets)) OF CSI-IM-ResourceSetId
        OPTIONAL     -- Need N
    ]]
}

Candidate change requests of v19.1.0

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

CR 5593 r2 (strong): Corrections on RRC for mobility enhancements Phase 4

Fields (21)

Field	Description
ltm-CandidateId-r18 LTM-CandidateId-r18
ltm-CandidatePCI-r18 PhysCellId · OPTIONAL Need M	This field identifies the PCI of the SpCell of the LTM candidate configuration contained in ltm-CandidateConfig .
ltm-SSB-Config-r18 LTM-SSB-Config-r18 · OPTIONAL Need M
ltm-CandidateConfig-r18 OCTET STRING (CONTAINING RRCReconfiguration) · OPTIONAL Need M	This field includes an RRCReconfiguration message used to configure an LTM candidate configuration.
ltm-ConfigComplete-r18 ENUMERATED {true} · OPTIONAL Need R
ltm-EarlyUL-SyncConfig-r18 OCTET STRING (CONTAINING EarlyUL-SyncConfig-r18) · OPTIONAL Need R	A configuration used to perform the early UL synchronization procedure over an UL or SUL carrier.
ltm-EarlyUL-SyncConfigSUL-r18 OCTET STRING (CONTAINING EarlyUL-SyncConfig-r18) · OPTIONAL Need R	A configuration used to perform the early UL synchronization procedure over an UL or SUL carrier.
ltm-TCI-Info-r18 LTM-TCI-Info-r18 · OPTIONAL Need M since v18.1.0
ltm-NoResetID-r18 INTEGER (1..maxNrofLTM-Configs-plus1-r18) · OPTIONAL Need M	If the network configures this field for one LTM candidate configuration, the network configures also for all LTM candidate configurations within ltm-CandidateToAddModList in LTM-Config and ensures that the UE has stored a value for ltm-ServingCellNoResetID within VarLTM-ServingCellNoResetID .
ltm-UE-MeasuredTA-ID-r18 INTEGER (1..maxNrofLTM-Configs-plus1-r18) · OPTIONAL Need M	If the network configures this field for one LTM candidate configuration, the network configures also for all LTM candidate configurations within ltm-CandidateToAddModList in LTM-Config and ensures that the UE has stored a value for ltm-ServingCellUE-MeasuredTA-ID within VarLTM-ServingCellUE-MeasuredTA-ID . This field is absent if tag2 is present for this LTM candidate configuration.
ltm-NoSecurityChangeID-r19 LTM-NoSecurityChangeId-r19 · OPTIONAL Need M since v19.0.0	If the network configures this field for one LTM candidate configuration, the network configures also for all LTM candidate configurations within ltm-CandidateToAddModList in LTM-Config and ensures that the UE has stored a value for ltm-ServingCellNoSecurityChangeID within VarLTM-ServingCellNoSecurityChange .
ltm-ExecutionCondition-r19 SetupRelease {LTM-ExecutionConditionList-r19} · OPTIONAL Need M since v19.0.0	This field can only be included in an ltm-Config associated with the MCG.
ltm-NZP-CSI-RS-ResourceToAddModList-r19 SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-Resources)) OF NZP-CSI-RS-Resource · OPTIONAL Need N since v19.0.0
ltm-NZP-CSI-RS-ResourceToReleaseList-r19 SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-Resources)) OF NZP-CSI-RS-ResourceId · OPTIONAL Need N since v19.0.0
ltm-NZP-CSI-RS-ResourceSetToAddModList-r19 SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourceSets)) OF NZP-CSI-RS-ResourceSet · OPTIONAL Need N since v19.0.0
ltm-NZP-CSI-RS-ResourceSetToReleaseList-r19 SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourceSets)) OF NZP-CSI-RS-ResourceSetId · OPTIONAL Need N since v19.0.0
ltm-CSI-ReportConfig-r19 SetupRelease {LTM-CSI-ReportConfig-r18} · OPTIONAL Need M since v19.0.0
ltm-CSI-IM-ResourceToAddModList-r19 SEQUENCE (SIZE (1..maxNrofCSI-IM-Resources)) OF CSI-IM-Resource · OPTIONAL Need N since v19.0.0	The network does not configure more than 8 entries in this list.
ltm-CSI-IM-ResourceToReleaseList-r19 SEQUENCE (SIZE (1..maxNrofCSI-IM-Resources)) OF CSI-IM-ResourceId · OPTIONAL Need N since v19.0.0
ltm-CSI-IM-ResourceSetToAddModList-r19 SEQUENCE (SIZE (1..maxNrofCSI-IM-ResourceSets)) OF CSI-IM-ResourceSet · OPTIONAL Need N since v19.0.0	The network does not configure more than 1 entry in this list.
ltm-CSI-IM-ResourceSetToReleaseList-r19 SEQUENCE (SIZE (1..maxNrofCSI-IM-ResourceSets)) OF CSI-IM-ResourceSetId · OPTIONAL Need N since v19.0.0

Used by (1)

LTM-Config-r18

LTM-Candidate (LTM-Candidate-r18)

Definition

Candidate change requests of v19.1.0

Fields (21)

Used by (1)

Uses (23)

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