SCellConfig

RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 6.3.2, in the CellGroupConfig clause

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

First seen v15.0.0 (2018-01) · Last changed v19.1.0 (2026-01)

Definition

SCellConfig ::=                     SEQUENCE {
    sCellIndex                          SCellIndex,
    sCellConfigCommon                   ServingCellConfigCommon                                     OPTIONAL,   -- Cond SCellAdd
    sCellConfigDedicated                ServingCellConfig                                           OPTIONAL,   -- Cond SCellAddMod
    ...,
    [[
        smtc                                SSB-MTC                                                     OPTIONAL    -- Need S
    ]],
    [[
        sCellState-r16                  ENUMERATED {activated}                                          OPTIONAL,   -- Cond SCellAddSync
        secondaryDRX-GroupConfig-r16    ENUMERATED {true}                                               OPTIONAL    -- Need S
    ]],
    [[
        preConfGapStatus-r17             BIT STRING (SIZE (maxNrofGapId-r17))                           OPTIONAL,   -- Cond PreConfigMG
        goodServingCellEvaluationBFD-r17 GoodServingCellEvaluation-r17                                  OPTIONAL,   -- Need R
        sCellSIB20-r17                   SetupRelease { SCellSIB20-r17 }                                OPTIONAL    -- Need M
    ]],
    [[
        plmn-IdentityInfoList-r17       SetupRelease {PLMN-IdentityInfoList}                            OPTIONAL,   -- Cond SCellSIB20-Opt
        npn-IdentityInfoList-r17        SetupRelease {NPN-IdentityInfoList-r16}                         OPTIONAL    -- Cond SCellSIB20-Opt
    ]],
    [[
        od-ssb-r19                      SetupRelease {OD-SSB-r19}                                       OPTIONAL,   -- Need M
        adapt-SSB-Config-r19            SetupRelease {Adapt-SSB-Config-r19}                             OPTIONAL    -- Need M
    ]]
}

Fields (13)

Field	Description
sCellIndex SCellIndex
sCellConfigCommon ServingCellConfigCommon · OPTIONAL Cond SCellAdd
sCellConfigDedicated ServingCellConfig · OPTIONAL Cond SCellAddMod
smtc SSB-MTC · OPTIONAL Need S since v15.3.0	The SSB periodicity/offset/duration configuration of target cell for NR SCell addition. The network sets the periodicityAndOffset to indicate the same periodicity as ssb-periodicityServingCell in sCellConfigCommon . The smtc is based on the timing of the SpCell of associated cell group. In case of inter-RAT handover to NR, the timing reference is the NR PCell. In case of intra-NR PCell change (standalone NR) or NR PSCell change (EN-DC), the timing reference is the target SpCell. If the field is absent and absoluteFrequencySSB is included, the UE uses the SMTC in the measObjectNR having the same SSB frequency and subcarrier spacing, as configured before the reception of the RRC message. If the SCell is an SSB-less SCell, this field is absent.
sCellState-r16 ENUMERATED {activated} · OPTIONAL Cond SCellAddSync since v16.0.0	Indicates whether the SCell shall be considered to be in activated state upon SCell configuration. If the field is included for an SCell configured with TRS for fast activation of the SCell, such TRS is not used for the corresponding SCell.
secondaryDRX-GroupConfig-r16 ENUMERATED {true} · OPTIONAL Need S since v16.1.0	The field is used to indicate whether the SCell belongs to the secondary DRX group. All serving cells in the secondary DRX group shall belong to one Frequency Range and all serving cells in the default DRX group shall belong to another Frequency Range. If drx-ConfigSecondaryGroup is configured, the field is optionally present. The network always includes the field if the field was previously configured for this SCell and the SCell remains in the secondary DRX group. Removal of an individual SCell from the secondary DRX group is supported by using an SCell release and addition. Otherwise, if drx-ConfigSecondaryGroup is not configured, the field is absent and the UE shall release the field. The UE shall also release the field if drx-ConfigSecondaryGroup is released without including sCellToAddModList .
preConfGapStatus-r17 BIT STRING (SIZE (maxNrofGapId-r17)) · OPTIONAL Cond PreConfigMG since v17.1.0	Indicates whether the pre-configured measurement gaps (i.e. the gaps configured with preConfigInd ) are activated or deactivated while this SCell is deactivated. If this field is configured, the UE shall apply network-controlled mechanism for activation and deactivation of the pre-configured measurement gaps, otherwise the UE shall apply the autonomous activation/deactivation mechanism, as specified in TS 38.133 [14]. The first/leftmost bit corresponds to the measurement gap with gap ID 1, the second bit corresponds to measurement gap with gap ID 2, and so on. Value 0 indicates that the corresponding pre-configured measurement gap is deactivated while value 1 indicates that the corresponding pre-configured measurement gap is activated. The UE shall ignore the bit if the corresponding measurement gap is not a pre-configured measurement gap.
goodServingCellEvaluationBFD-r17 GoodServingCellEvaluation-r17 · OPTIONAL Need R since v17.0.0	Indicates the criterion for a UE to detect the good serving cell quality for BFD relaxation in an SCell in RRC_CONNECTED. This field is always configured when the network enables BFD relaxation for the UE in this SCell. This field is absent if failureDetectionSetN is present for the SCell.
sCellSIB20-r17 SetupRelease { SCellSIB20-r17 } · OPTIONAL Need M since v17.0.0
plmn-IdentityInfoList-r17 SetupRelease {PLMN-IdentityInfoList} · OPTIONAL Cond SCellSIB20-Opt since v17.5.0
npn-IdentityInfoList-r17 SetupRelease {NPN-IdentityInfoList-r16} · OPTIONAL Cond SCellSIB20-Opt since v17.5.0
od-ssb-r19 SetupRelease {OD-SSB-r19} · OPTIONAL Need M since v19.0.0	Indicates the OD-SSB configuration in this SCell. The network does not configure adapt-SSB-Config and od-ssb simultaneously to a UE for the same SCell.
adapt-SSB-Config-r19 SetupRelease {Adapt-SSB-Config-r19} · OPTIONAL Need M since v19.1.0	Indicates the adaptive SSB burst periodicity configuration in this SCell. The network does not configure adapt-SSB-Config and od-ssb simultaneously to a UE for the same SCell.

Used by (1)

CellGroupConfig

SCellConfig

Definition

Fields (13)

Used by (1)

Uses (12)

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