SIB19 (SIB19-r17)

RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 6.3.1

SIB19-r17 is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v17.0.0 (2022-04) · Last changed v19.1.0 (2026-01)

Definition

SIB19 contains satellite assistance information for NTN access.

SIB19-r17 ::= SEQUENCE {
    ntn-Config-r17                           NTN-Config-r17                                  OPTIONAL,       -- Need R
    t-Service-r17                            INTEGER (0..549755813887)                       OPTIONAL,       -- Need R
    referenceLocation-r17                    ReferenceLocation-r17                           OPTIONAL,       -- Need R
    distanceThresh-r17                       INTEGER(0..65525)                               OPTIONAL,       -- Need R
    ntn-NeighCellConfigList-r17              NTN-NeighCellConfigList-r17                     OPTIONAL,       -- Need R
    lateNonCriticalExtension                 OCTET STRING                                    OPTIONAL,
    ...,
    [[
        ntn-NeighCellConfigListExt-v1720         NTN-NeighCellConfigList-r17                     OPTIONAL        -- Need R
    ]],
    [[
        movingReferenceLocation-r18              ReferenceLocation-r17                           OPTIONAL,       -- Need R
        ntn-CovEnh-r18                           NTN-CovEnh-r18                                  OPTIONAL,       -- Need R
        satSwitchWithReSync-r18                  SatSwitchWithReSync-r18                         OPTIONAL        -- Need R
    ]],
    [[
        refLocList-r19                           RefLocList-r19                                  OPTIONAL        -- Need R
    ]]
}

Candidate change requests of v19.1.0

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

CR 5627 r2 (strong): Further corrections to NR NTN Phase 3

Fields (11)

Field	Description
ntn-Config-r17 NTN-Config-r17 · OPTIONAL Need R since v17.1.0	Provides parameters needed for the UE to access NR via NTN access such as Ephemeris data, common TA parameters, k_offset, validity duration for UL sync information and epoch time. In a TN cell, this field is only present in ntn-NeighCellConfigList and ntn-NeighCellConfigListExt .
t-Service-r17 INTEGER (0..549755813887) · OPTIONAL Need R	Indicates the time information on when a cell provided via NTN is going to stop serving the area it is currently covering. This field applies for both service link switches in NTN quasi-Earth fixed cell and feeder link switches for both NTN quasi-Earth fixed and Earth-moving cell. The field indicates a time in multiples of 10 ms after 00:00:00 on Gregorian calendar date 1 January, 1900 (midnight between Sunday, December 31, 1899 and Monday, January 1, 1900). The exact stop time is between the time indicated by the value of this field minus 1 and the time indicated by the value of this field. The reference point for t-Service is the uplink time synchronization reference point of the cell. This field is only present in an NTN cell.
referenceLocation-r17 ReferenceLocation-r17 · OPTIONAL Need R	Reference location of the serving cell provided via NTN (quasi-)Earth fixed cell and is used in location-based measurement initiation in RRC_IDLE and RRC_INACTIVE, as defined in TS 38.304 [20]. This field is only present in an NTN cell.
distanceThresh-r17 INTEGER(0..65525) · OPTIONAL Need R since v17.1.0	Distance from the serving cell reference location and is used in location-based measurement initiation in RRC_IDLE and RRC_INACTIVE, as defined in TS 38.304 [20]. Each step represents 50m. This field is only present in an NTN cell.
ntn-NeighCellConfigList-r17 NTN-NeighCellConfigList-r17 · OPTIONAL Need R since v17.1.0	Provides a list of NTN neighbour cells including their ntn-Config , carrier frequency and PhysCellId . This set includes all elements of ntn-NeighCellConfigList and all elements of ntn-NeighCellConfigListExt . If ntn-Config is absent for an entry in ntn-NeighCellConfigListExt , the ntn-Config provided in the entry at the same position in ntn-NeighCellConfigList applies. Network provides ntn-Config for the first entry of ntn-NeighCellConfigList. If the ntn-Config is absent for any other entry in ntn-NeighCellConfigList , the ntn-Config provided in the previous entry in ntn-NeighCellConfigList applies.
lateNonCriticalExtension OCTET STRING · OPTIONAL
ntn-NeighCellConfigListExt-v1720 NTN-NeighCellConfigList-r17 · OPTIONAL Need R since v17.2.0	Provides a list of NTN neighbour cells including their ntn-Config , carrier frequency and PhysCellId . This set includes all elements of ntn-NeighCellConfigList and all elements of ntn-NeighCellConfigListExt . If ntn-Config is absent for an entry in ntn-NeighCellConfigListExt , the ntn-Config provided in the entry at the same position in ntn-NeighCellConfigList applies. Network provides ntn-Config for the first entry of ntn-NeighCellConfigList. If the ntn-Config is absent for any other entry in ntn-NeighCellConfigList , the ntn-Config provided in the previous entry in ntn-NeighCellConfigList applies.
movingReferenceLocation-r18 ReferenceLocation-r17 · OPTIONAL Need R since v18.0.0	Reference location of the serving cell of an NTN Earth-moving cell at a time reference. It is used in the evaluation of eventD2 and condEventD2 criteria for the serving cell in RRC_CONNECTED, and location-based measurement initiation in RRC_IDLE and RRC_INACTIVE when distanceThresh is also configured, as defined in TS 38.304 [20]. The time reference of this field is indicated by epochTime in ntn-Config of the serving cell. This field is excluded when determining changes in system information, i.e., changes to movingReferenceLocation should neither result in system information change notifications nor in a modification of valueTag in SIB1 . This field is only present in an NTN cell.
ntn-CovEnh-r18 NTN-CovEnh-r18 · OPTIONAL Need R since v18.5.0
satSwitchWithReSync-r18 SatSwitchWithReSync-r18 · OPTIONAL Need R since v18.0.0	Provides parameters for the target satellite required to perform satellite switch with resynchronization. This field is only present in an NTN cell and its presence indicates that satellite switch without PCI change is supported in the cell.
refLocList-r19 RefLocList-r19 · OPTIONAL Need R since v19.1.0	Indicates a list of reference locations associated to SMTC configurations in smtc and/or smtc5list (in SIB2 and/or SIB4 ) in an NTN (quasi-)Earth fixed cell used for location-based SMTC selection and assisted SMTC and measurement gap configuration in RRC_CONNECTED state. If refLoc is absent for an entry in refLocList , the provided reference location in referenceLocation - r17 applies, if present. This field is only present in an NTN cell.

Used by (1)

SystemInformation-IEs

SIB19 (SIB19-r17)

Definition

Candidate change requests of v19.1.0

Fields (11)

Used by (1)

Uses (6)

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