AS-Context

inter-node RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 11.2.2, in the HandoverPreparationInformation clause

AS-Context is an inter-node 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

AS-Context ::=                          SEQUENCE {
    reestablishmentInfo                     ReestablishmentInfo                                 OPTIONAL,
    configRestrictInfo                      ConfigRestrictInfoSCG                               OPTIONAL,
    ...,
    [[  ran-NotificationAreaInfo            RAN-NotificationAreaInfo                            OPTIONAL
    ]],
    [[  ueAssistanceInformation             OCTET STRING (CONTAINING UEAssistanceInformation)   OPTIONAL   -- Cond HO2
    ]],
    [[
        selectedBandCombinationSN               BandCombinationInfoSN                               OPTIONAL
    ]],
    [[
        configRestrictInfoDAPS-r16              ConfigRestrictInfoDAPS-r16                          OPTIONAL,
        sidelinkUEInformationNR-r16             OCTET STRING                                        OPTIONAL,
        sidelinkUEInformationEUTRA-r16          OCTET STRING                                        OPTIONAL,
        ueAssistanceInformationEUTRA-r16        OCTET STRING                                        OPTIONAL,
        ueAssistanceInformationSCG-r16          OCTET STRING (CONTAINING UEAssistanceInformation)   OPTIONAL,   -- Cond HO2
        needForGapsInfoNR-r16                   NeedForGapsInfoNR-r16                               OPTIONAL
    ]],
    [[
        configRestrictInfoDAPS-v1640            ConfigRestrictInfoDAPS-v1640                        OPTIONAL
    ]],
    [[
        needForGapNCSG-InfoNR-r17               NeedForGapNCSG-InfoNR-r17                           OPTIONAL,
        needForGapNCSG-InfoEUTRA-r17            NeedForGapNCSG-InfoEUTRA-r17                        OPTIONAL,
        mbsInterestIndication-r17               OCTET STRING (CONTAINING MBSInterestIndication-r17) OPTIONAL
    ]],
    [[
        needForInterruptionInfoNR-r18           NeedForInterruptionInfoNR-r18                       OPTIONAL,
        flightPathInfoReport-r18                FlightPathInfoReport-r18                            OPTIONAL
    ]],
    [[
        retainLoggedMeasurements-r19            ENUMERATED {true}                                   OPTIONAL,
        ue-ApplicabilityReportList-r19          ApplicabilityReportList-r19                         OPTIONAL
    ]]
}

Fields (19)

Field	Description
reestablishmentInfo ReestablishmentInfo · OPTIONAL
configRestrictInfo ConfigRestrictInfoSCG · OPTIONAL
ran-NotificationAreaInfo RAN-NotificationAreaInfo · OPTIONAL since v15.3.0
ueAssistanceInformation OCTET STRING (CONTAINING UEAssistanceInformation) · OPTIONAL Cond HO2 since v15.5.0	Includes for each UE assistance feature the information last reported by the UE, if any.
selectedBandCombinationSN BandCombinationInfoSN · OPTIONAL since v15.6.0	Indicates the band combination selected by SN in (NG)EN-DC, NE-DC, and NR-DC.
configRestrictInfoDAPS-r16 ConfigRestrictInfoDAPS-r16 · OPTIONAL since v16.0.0	Includes fields for which source cell explicitly indicates the restriction to be observed by target cell during DAPS handover.
sidelinkUEInformationNR-r16 OCTET STRING · OPTIONAL since v16.0.0	This field includes SidelinkUEInformationNR IE.
sidelinkUEInformationEUTRA-r16 OCTET STRING · OPTIONAL since v16.0.0	This field includes SidelinkUEInformation IE as specified in TS 36.331 [10].
ueAssistanceInformationEUTRA-r16 OCTET STRING · OPTIONAL since v16.0.0
ueAssistanceInformationSCG-r16 OCTET STRING (CONTAINING UEAssistanceInformation) · OPTIONAL Cond HO2 since v16.1.0	Includes for each UE assistance feature associated with the SCG, the information last reported by the UE in the NR UEAssistanceInformation message for the SCG, if any.
needForGapsInfoNR-r16 NeedForGapsInfoNR-r16 · OPTIONAL since v16.1.0	Includes measurement gap requirement information of the UE for NR target bands. The field includes needForGapsInfoNR in RRCReconfigurationComplete message, needForGapsInfoNR in RRCResumeComplete message or musim-needForGapsInfoNR in UEAssistanceInformation message that is last reported by the UE, if any.
configRestrictInfoDAPS-v1640 ConfigRestrictInfoDAPS-v1640 · OPTIONAL since v16.4.1	Includes fields for which source cell explicitly indicates the restriction to be observed by target cell during DAPS handover.
needForGapNCSG-InfoNR-r17 NeedForGapNCSG-InfoNR-r17 · OPTIONAL since v17.1.0
needForGapNCSG-InfoEUTRA-r17 NeedForGapNCSG-InfoEUTRA-r17 · OPTIONAL since v17.1.0
mbsInterestIndication-r17 OCTET STRING (CONTAINING MBSInterestIndication-r17) · OPTIONAL since v17.0.0	Includes the information last reported by the UE in the NR MBSInterestIndication message, where the plmn-Index (if included by the UE in tmgi ) is replaced by the PLMN ID, if needed. A TMGI for which the plmn-Index points to a non-serving SNPN is removed from the NR MBSInterestIndication message.
needForInterruptionInfoNR-r18 NeedForInterruptionInfoNR-r18 · OPTIONAL since v18.0.0
flightPathInfoReport-r18 FlightPathInfoReport-r18 · OPTIONAL since v18.0.0
retainLoggedMeasurements-r19 ENUMERATED {true} · OPTIONAL since v19.0.0	Indication to the target gNB that the UE shall retain logged measurements available in VarCSI-LogMeasReport at execution of the handover. If included, the target gNB is allowed to include the corresponding indication to the UE within the HandoverCommand message.
ue-ApplicabilityReportList-r19 ApplicabilityReportList-r19 · OPTIONAL since v19.1.0	Includes information related to the applicability of prediction configurations and/or sets of parameters for prediction configurations that has been reported by the UE.

Used by (1)

HandoverPreparationInformation-IEs

AS-Context

Definition

Fields (19)

Used by (1)

Uses (14)

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