CG-ConfigInfo

inter-node RRC message · TS 38.331 v19.4.0 (2026-09) · clause 11.2.2

CG-ConfigInfo is an inter-node RRC message of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v15.1.0 (2018-04) · Last changed v19.0.0 (2025-10), in CG-ConfigInfo-v1800-IEs

Definition

This message is used by master eNB or gNB to request the SgNB or SeNB to perform certain actions e.g. to establish, modify or release an SCG. The message may include additional information e.g. to assist the SgNB or SeNB to set the SCG configuration. It can also be used by a CU to request a DU to perform certain actions, e.g. to establish, or modify an MCG or SCG.

CG-ConfigInfo ::=               SEQUENCE {
    criticalExtensions              CHOICE {
        c1                              CHOICE{
            cg-ConfigInfo               CG-ConfigInfo-IEs,
            spare3 NULL, spare2 NULL, spare1 NULL
        },
        criticalExtensionsFuture        SEQUENCE {}
    }
}

Fields (7)

Field	Description
criticalExtensions CHOICE {
c1 CHOICE{
cg-ConfigInfo CG-ConfigInfo-IEs
spare3 NULL
spare2 NULL
spare1 NULL
criticalExtensionsFuture SEQUENCE {}

Fields of CG-ConfigInfo-IEs (15)

Field	Description
ue-CapabilityInfo OCTET STRING (CONTAINING UE-CapabilityRAT-ContainerList) · OPTIONAL Cond SN-AddMod	Contains the IE UE-CapabilityRAT-ContainerList supported by the UE (see NOTE 3). A gNB that retrieves MRDC related capability containers ensures that the set of included MRDC containers is consistent w.r.t. the feature set related information.
candidateCellInfoListMN MeasResultList2NR · OPTIONAL	Contains information regarding cells that the master node or the source node suggests the target gNB or DU to consider configuring. In case of MN initiated CPA, CPC or CHO with candidate SCG(s), the field candidateCellInfoListMN contains information regarding cells that the MN suggests the candidate target secondary node to consider configuring for MN initiated CPA, CPC, CHO with candidate SCG(s), or subsequent CPAC. For (NG)EN-DC, including CSI-RS measurement results in candidateCellInfoListMN is not supported in this version of the specification. For NR-DC, including SSB and/or CSI-RS measurement results in candidateCellInfoListMN is supported.
candidateCellInfoListSN OCTET STRING (CONTAINING MeasResultList2NR) · OPTIONAL	Contains information regarding cells that the master node or the source node suggests the target gNB or DU to consider configuring. In case of MN initiated CPA, CPC or CHO with candidate SCG(s), the field candidateCellInfoListMN contains information regarding cells that the MN suggests the candidate target secondary node to consider configuring for MN initiated CPA, CPC, CHO with candidate SCG(s), or subsequent CPAC. For (NG)EN-DC, including CSI-RS measurement results in candidateCellInfoListMN is not supported in this version of the specification. For NR-DC, including SSB and/or CSI-RS measurement results in candidateCellInfoListMN is supported.
measResultCellListSFTD-NR MeasResultCellListSFTD-NR · OPTIONAL since v15.6.0
scgFailureInfo SEQUENCE { · OPTIONAL	Contains SCG failure type and measurement results. In case the sender has no measurement results available, the sender may include one empty entry (i.e. without any optional fields present) in measResultPerMOList . This field is used in (NG)EN-DC and NR-DC.
failureType ENUMERATED { t310-Expiry, randomAccessProblem, rlc-MaxNumRetx, synchReconfigFailure-SCG, scg-reconfigFailure, srb3-IntegrityFailure}
measResultSCG OCTET STRING (CONTAINING MeasResultSCG-Failure)
configRestrictInfo ConfigRestrictInfoSCG · OPTIONAL	Includes fields for which SgNB is explicitly indicated to observe a configuration restriction.
drx-InfoMCG DRX-Info · OPTIONAL	This field contains the DRX long and short cycle configuration of the MCG. This field is used in (NG)EN-DC and NE-DC.
measConfigMN MeasConfigMN · OPTIONAL
sourceConfigSCG OCTET STRING (CONTAINING RRCReconfiguration) · OPTIONAL	Includes all of the current SCG configurations used by the target SN to build delta configuration to be sent to UE, e.g. during SN change. The field contains the RRCReconfiguration message which may include secondaryCellGroup, measConfig , and conditionalReconfiguration . The field is signalled upon change of SN, unless MN uses full configuration option. Otherwise, the field is absent.
scg-RB-Config OCTET STRING (CONTAINING RadioBearerConfig) · OPTIONAL	Contains all of the fields in the IE RadioBearerConfig used in SN, used to allow the target SN to use delta configuration to the UE, e.g. during SN change. The field is signalled upon change of SN unless MN uses full configuration option. Otherwise, the field is absent.
mcg-RB-Config OCTET STRING (CONTAINING RadioBearerConfig) · OPTIONAL	Contains all of the fields in the IE RadioBearerConfig used in MN, used by the SN to support delta configuration to UE (i.e. when MN does not use full configuration option), for bearer type change between MN terminated bearer with NR PDCP to SN terminated bearer. It is also used to indicate the PDCP duplication related information for MN terminated split bearer (whether duplication is configured and if so, whether it is initially activated) in SN Addition/Modification procedure. Otherwise, this field is absent.
mrdc-AssistanceInfo MRDC-AssistanceInfo · OPTIONAL since v15.3.0	Contains the IDC assistance information for MR-DC reported by the UE (see TS 36.331 [10]).
nonCriticalExtension CG-ConfigInfo-v1540-IEs · OPTIONAL

Fields of CG-ConfigInfo-v1540-IEs (6)

Field	Description
ph-InfoMCG PH-TypeListMCG · OPTIONAL since v15.4.0	Power headroom information in MCG that is needed in the reception of PHR MAC CE in SCG.
measResultReportCGI SEQUENCE { · OPTIONAL since v15.4.0	Used by MN to provide SN with CGI-Info for the cell as per SN′s request. In this version of the specification, the measResultReportCGI is used for (NG)EN-DC and NR-DC and the measResultReportCGI-EUTRA is used only for NE-DC.
ssbFrequency ARFCN-ValueNR since v15.4.0
cellForWhichToReportCGI PhysCellId since v15.4.0
cgi-Info CGI-InfoNR since v15.4.0
nonCriticalExtension CG-ConfigInfo-v1560-IEs · OPTIONAL since v15.4.0

Fields of CG-ConfigInfo-v1560-IEs (14)

Field	Description
candidateCellInfoListMN-EUTRA OCTET STRING · OPTIONAL since v15.6.0	Includes the MeasResultList3EUTRA as specified in TS 36.331 [10]. Contains information regarding cells that the master node or the source node suggests the target secondary eNB to consider configuring. These fields are only used in NE-DC.
candidateCellInfoListSN-EUTRA OCTET STRING · OPTIONAL since v15.6.0	Includes the MeasResultList3EUTRA as specified in TS 36.331 [10]. Contains information regarding cells that the master node or the source node suggests the target secondary eNB to consider configuring. These fields are only used in NE-DC.
sourceConfigSCG-EUTRA OCTET STRING · OPTIONAL since v15.6.0	Includes the E-UTRA RRCConnectionReconfiguration message as specified in TS 36.331 [10]. In this version of the specification, the E-UTRA RRC message can only include the field scg-Configuration. In this version of the specification, this field is absent when master gNB uses full configuration option. This field is only used in NE-DC.
scgFailureInfoEUTRA SEQUENCE { · OPTIONAL since v15.6.0
failureTypeEUTRA ENUMERATED { t313-Expiry, randomAccessProblem, rlc-MaxNumRetx, scg-ChangeFailure} since v15.6.0
measResultSCG-EUTRA OCTET STRING since v15.6.0	This field includes the MeasResultSCG-FailureMRDC IE as specified in TS 36.331 [10]. This field is only used in NE-DC.
drx-ConfigMCG DRX-Config · OPTIONAL since v15.6.0	This field contains the complete DRX configuration of the MCG. This field is only used in NR-DC.
measResultReportCGI-EUTRA SEQUENCE { · OPTIONAL since v15.6.0	Used by MN to provide SN with CGI-Info for the cell as per SN′s request. In this version of the specification, the measResultReportCGI is used for (NG)EN-DC and NR-DC and the measResultReportCGI-EUTRA is used only for NE-DC.
eutraFrequency ARFCN-ValueEUTRA since v15.6.0
cellForWhichToReportCGI-EUTRA EUTRA-PhysCellId since v15.6.0
cgi-InfoEUTRA CGI-InfoEUTRA since v15.6.0
measResultCellListSFTD-EUTRA MeasResultCellListSFTD-EUTRA · OPTIONAL since v15.6.0
fr-InfoListMCG FR-InfoList · OPTIONAL since v15.6.0	Contains information of FR information of serving cells that include PCell and SCell(s) configured in MCG.
nonCriticalExtension CG-ConfigInfo-v1570-IEs · OPTIONAL since v15.6.0

Fields of CG-ConfigInfo-v1570-IEs (3)

Field	Description
sftdFrequencyList-NR SFTD-FrequencyList-NR · OPTIONAL since v15.7.0	Includes a list of SSB frequencies. Each entry identifies the SSB frequency of a PSCell, which corresponds to one MeasResultCellSFTD-NR entry in the MeasResultCellListSFTD-NR .
sftdFrequencyList-EUTRA SFTD-FrequencyList-EUTRA · OPTIONAL since v15.7.0	Includes a list of E-UTRA frequencies. Each entry identifies the carrier frequency of a PSCell, which corresponds to one MeasResultSFTD-EUTRA entry in the MeasResultCellListSFTD-EUTRA .
nonCriticalExtension CG-ConfigInfo-v1590-IEs · OPTIONAL since v15.7.0

Fields of CG-ConfigInfo-v1590-IEs (2)

Field	Description
servFrequenciesMN-NR SEQUENCE (SIZE (1.. maxNrofServingCells-1)) OF ARFCN-ValueNR · OPTIONAL since v15.9.0	Indicates the frequency of all serving cells that include PCell and SCell(s) with SSB configured in MCG. This field is only used in NR-DC. servFrequenciesMN-NR indicates absoluteFrequencySSB.
nonCriticalExtension CG-ConfigInfo-v1610-IEs · OPTIONAL since v15.9.0

Fields of CG-ConfigInfo-v1610-IEs (11)

Field	Description
drx-InfoMCG2 DRX-Info2 · OPTIONAL since v16.1.0	This field contains the drx-onDurationTimer configuration of the MCG. This field is only used in (NG)EN-DC.
alignedDRX-Indication ENUMERATED {true} · OPTIONAL since v16.1.0	This field is signalled upon MN triggered CGI reporting by the UE that requires aligned DRX configurations between the MCG and the SCG (i.e. same DRX cycle and on-duration configured by MN completely contains on-duration configured by SN).
scgFailureInfo-r16 SEQUENCE { · OPTIONAL since v16.1.0	Contains SCG failure type and measurement results. In case the sender has no measurement results available, the sender may include one empty entry (i.e. without any optional fields present) in measResultPerMOList . This field is used in (NG)EN-DC and NR-DC.
failureType-r16 ENUMERATED { scg-lbtFailure-r16, beamFailureRecoveryFailure-r16, t312-Expiry-r16, bh-RLF-r16, beamFailure-r17, spare3, spare2, spare1} since v16.1.0
measResultSCG-r16 OCTET STRING (CONTAINING MeasResultSCG-Failure) since v16.1.0
dummy1 SEQUENCE { · OPTIONAL since v16.5.0	These fields are not used in the specification and SN ignores the received value(s).
failureTypeEUTRA-r16 ENUMERATED { scg-lbtFailure-r16, beamFailureRecoveryFailure-r16, t312-Expiry-r16, spare5, spare4, spare3, spare2, spare1} since v16.5.0
measResultSCG-EUTRA-r16 OCTET STRING since v16.5.0	This field includes the MeasResultSCG-FailureMRDC IE as specified in TS 36.331 [10]. This field is only used in NE-DC.
sidelinkUEInformationNR-r16 OCTET STRING (CONTAINING SidelinkUEInformationNR-r16) · OPTIONAL since v16.1.0	This field contains the NR SidelinkUEInformationNR message.
sidelinkUEInformationEUTRA-r16 OCTET STRING · OPTIONAL since v16.1.0	This field contains the E-UTRA SidelinkUEInformation message as specified in TS 36.331 [10].
nonCriticalExtension CG-ConfigInfo-v1620-IEs · OPTIONAL since v16.1.0

Fields of CG-ConfigInfo-v1620-IEs (2)

Field	Description
ueAssistanceInformationSourceSCG-r16 OCTET STRING (CONTAINING UEAssistanceInformation) · OPTIONAL since v16.2.0	Includes for each UE assistance feature associated with the SCG, the information last reported by the UE in the NR UEAssistanceInformation message for the source SCG, if any.
nonCriticalExtension CG-ConfigInfo-v1640-IEs · OPTIONAL since v16.2.0

Fields of CG-ConfigInfo-v1640-IEs (3)

Field	Description
servCellInfoListMCG-NR-r16 ServCellInfoListMCG-NR-r16 · OPTIONAL since v16.4.1	Indicates the frequency band indicator, carrier center frequency, UE specific channel bandwidth and SCS of the serving cell(s) in the MCG in intra-band NE-DC. The field is needed when MN and SN operate serving cells in the same band for either contiguous or non-contiguous intra-band band combination or LTE NR inter-band band combinations where the frequency range of the E-UTRA band is a subset of the frequency range of the NR band (as specified in Table 5.5B.4.1-1 of TS 38.101-3 [34]) in NE-DC.
servCellInfoListMCG-EUTRA-r16 ServCellInfoListMCG-EUTRA-r16 · OPTIONAL since v16.4.1	Indicates the carrier frequency and the transmission bandwidth of the serving cell(s) in the MCG in intra-band (NG)EN-DC. The field is needed when MN and SN operate serving cells in the same band for either contiguous or non-contiguous intra-band band combination or LTE NR inter-band band combinations where the frequency range of the E-UTRA band is a subset of the frequency range of the NR band (as specified in Table 5.5B.4.1-1 of TS 38.101-3 [34]) in (NG)EN-DC.
nonCriticalExtension CG-ConfigInfo-v1700-IEs · OPTIONAL since v16.4.1

Fields of CG-ConfigInfo-v1700-IEs (4)

Field	Description
candidateCellListCPC-r17 CandidateCellListCPC-r17 · OPTIONAL since v17.0.0	Contains information regarding cells that the source secondary node suggests the candidate target secondary node to consider configuring for SN initiated Conditional PSCell Change (CPC) or SN initiated inter-SN subsequent CPAC.
twoPHRModeMCG-r17 ENUMERATED {enabled} · OPTIONAL since v17.2.0	Indicates if the power headroom for MCG shall be reported as two PHRs (each PHR associated with a SRS resource set) is enabled or not.
lowMobilityEvaluationConnectedInPCell-r17 ENUMERATED {enabled} · OPTIONAL since v17.1.0	Indicates if low mobility criterion has been configured in NR PCell.
nonCriticalExtension CG-ConfigInfo-v1730-IEs · OPTIONAL since v17.0.0

Fields of CG-ConfigInfo-v1730-IEs (3)

Field	Description
fr1-Carriers-MCG-r17 INTEGER (1..32) · OPTIONAL since v17.3.0	Indicates the number of FR1 or FR2 serving cells configured in MCG.
fr2-Carriers-MCG-r17 INTEGER (1..32) · OPTIONAL since v17.3.0	Indicates the number of FR1 or FR2 serving cells configured in MCG.
nonCriticalExtension CG-ConfigInfo-v1800-IEs · OPTIONAL since v17.3.0

Fields of CG-ConfigInfo-v1800-IEs (7)

Field	Description
musim-GapConfigInfo-r18 MUSIM-GapConfig-r17 · OPTIONAL since v18.0.0	Indicates the MUSIM gap configuration configured by MN.
musim-CapRestrictionInfo-r18 SEQUENCE { · OPTIONAL since v18.0.0	Indicates the UE's preference on SCell(s) or PSCell to be released, serving cell(s) with restricted capability, band(s) or combination(s) of bands with restricted capability, or band(s) or band combination(s) to be avoided for UE temporary capabilities restriction purpose with the musim-candidateBandList-r18 only for musim-AffectedBandsList-r18 and musim-AvoidedBandsList-r18 . All fields in musim-CapRestriction-r18 can be sent from MN to SN, i.e., it is up to MN implementation to decide which field(s) need to be sent.
musim-CapRestriction-r18 MUSIM-CapRestriction-r18 · OPTIONAL since v18.0.0
musim-CandidateBandList-r18 MUSIM-CandidateBandList-r18 · OPTIONAL since v18.0.0
scpac-ReferenceConfiguration-r18 ReferenceConfiguration-r18 · OPTIONAL since v18.0.0	Includes the reference configuration associated with the SCG for the candidate supporting subsequent CPAC.
subsequentCPAC-Candidates-r18 CandidateCellListCPC-r17 · OPTIONAL since v18.1.0	Includes the subsequent CPAC candidate PSCells that the UE has stored in MCG VarConditionalReconfig .
nonCriticalExtension CG-ConfigInfo-v1900-IEs · OPTIONAL since v18.0.0

Fields of CG-ConfigInfo-v1900-IEs (4)

Field	Description
measResultReportCGI-EUTRA-v1900 SEQUENCE { · OPTIONAL since v19.0.0	Used by MN to provide SN with CGI-Info for the cell as per SN′s request. In this version of the specification, the measResultReportCGI is used for (NG)EN-DC and NR-DC and the measResultReportCGI-EUTRA is used only for NE-DC.
hsdn-Cell-r19 ENUMERATED {true} since v19.0.0	Used by MN to provide SN with hsdn-Cell for the cell reported in measResultReportCGI-EUTRA as per SN′s request. In this version of the specification, this field is used only for NE-DC.
ltm-ReferenceConfigurationMCG-r19 ReferenceConfiguration-r18 · OPTIONAL since v19.0.0	The field contains the LTM reference configuration to be used at the SCG. This field is only used in NR-DC.
nonCriticalExtension SEQUENCE {} · OPTIONAL since v19.0.0

Uses (1)

CG-ConfigInfo-IEs