specviewer.org TS 38.331 ASN.1 index SlotFormatIndicator

SlotFormatIndicator

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

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

First seen v15.1.0 (2018-04) · Last changed v17.1.0 (2022-07)

Definition

The IE SlotFormatIndicator is used to configure monitoring a Group-Common-PDCCH for Slot-Format-Indicators (SFI).

SlotFormatIndicator ::=     SEQUENCE {
    sfi-RNTI                    RNTI-Value,
    dci-PayloadSize             INTEGER (1..maxSFI-DCI-PayloadSize),
    slotFormatCombToAddModList  SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF SlotFormatCombinationsPerCell
    OPTIONAL, -- Need N
    slotFormatCombToReleaseList SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF ServCellIndex                       OPTIONAL, -- Need N
    ...,
    [[
        availableRB-SetsToAddModList-r16  SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF AvailableRB-SetsPerCell-r16   OPTIONAL, -- Need N
        availableRB-SetsToReleaseList-r16 SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF ServCellIndex                 OPTIONAL, -- Need N
        switchTriggerToAddModList-r16     SEQUENCE (SIZE(1..4)) OF SearchSpaceSwitchTrigger-r16                                   OPTIONAL, -- Need N
        switchTriggerToReleaseList-r16    SEQUENCE (SIZE(1..4)) OF ServCellIndex                                                  OPTIONAL, -- Need N
        co-DurationsPerCellToAddModList-r16 SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF CO-DurationsPerCell-r16     OPTIONAL, -- Need N
        co-DurationsPerCellToReleaseList-r16 SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF ServCellIndex              OPTIONAL  -- Need N
    ]],
    [[
        switchTriggerToAddModListSizeExt-r16   SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroupMinus4-r16)) OF
        SearchSpaceSwitchTrigger-r16  OPTIONAL, -- Need N
        switchTriggerToReleaseListSizeExt-r16  SEQUENCE (SIZE(1.. maxNrofAggregatedCellsPerCellGroupMinus4-r16)) OF
        ServCellIndex                 OPTIONAL  -- Need N
    ]],
    [[
        co-DurationsPerCellToAddModList-r17 SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF CO-DurationsPerCell-r17 OPTIONAL  -- Need N
    ]]
}

Candidate change requests of v17.1.0

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

Fields (13)

FieldDescription
sfi-RNTI
RNTI-Value
RNTI used for SFI on the given cell (see TS 38.213 [13], clause 11.1.1).
dci-PayloadSize
INTEGER (1..maxSFI-DCI-PayloadSize)
Total length of the DCI payload scrambled with SFI-RNTI (see TS 38.213 [13], clause 11.1.1).
slotFormatCombToAddModList
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF SlotFormatCombinationsPerCell · OPTIONAL Need N
A list of SlotFormatCombinations for the UE's serving cells (see TS 38.213 [13], clause 11.1.1).
slotFormatCombToReleaseList
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF ServCellIndex · OPTIONAL Need N
availableRB-SetsToAddModList-r16
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF AvailableRB-SetsPerCell-r16 · OPTIONAL Need N
since v16.1.0
A list of AvailableRB-SetsPerCell objects (see TS 38.213 [13], clause 11.1.1).
availableRB-SetsToReleaseList-r16
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF ServCellIndex · OPTIONAL Need N
since v16.4.0
switchTriggerToAddModList-r16
SEQUENCE (SIZE(1..4)) OF SearchSpaceSwitchTrigger-r16 · OPTIONAL Need N
since v16.2.0
A list of SearchSpaceSwitchTrigger objects. Each SearchSpaceSwitchTrigger object provides position in DCI of the bit field indicating search space switching flag for a serving cell or, if cellGroupsForSwitchList is configured, group of serving cells (see TS 38.213 [13], clause 10.4). If cellGroupsForSwitchList is configured, only one of the cells belonging to the same cell group is added/modified, and the configuration applies to all cells belonging to the cellGroupsForSwitchList (see TS 38.213 [13], clause 10.4). The network configures more than 4 SearchSpaceSwitchTrigger objects only if cellGroupsForSwitchList is not configured. The UE shall consider entries in switchTriggerToAddModList and in switchTriggerToAddModListSizeExt as a single list, i.e. an entry created using switchTriggerToAddModList can be modifed using switchTriggerToAddModListSizeExt and vice-versa.
switchTriggerToReleaseList-r16
SEQUENCE (SIZE(1..4)) OF ServCellIndex · OPTIONAL Need N
since v16.2.0
co-DurationsPerCellToAddModList-r16
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF CO-DurationsPerCell-r16 · OPTIONAL Need N
since v16.1.0
A list of CO-DurationsPerCell objects. If not configured, the UE uses the slot format indicator (SFI), if available, to determine the channel occupancy duration (see TS 38.213 [13], clause 11.1.1).
co-DurationsPerCellToReleaseList-r16
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF ServCellIndex · OPTIONAL Need N
since v16.1.0
A list of CO-DurationsPerCell objects to be released. An entry created using co-DurationsPerCellToAddModList-r16 or co-DurationsPerCellToAddModList-r17 can be deleted using co-DurationsPerCellToReleaseList .
switchTriggerToAddModListSizeExt-r16
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroupMinus4-r16)) OF SearchSpaceSwitchTrigger-r16 · OPTIONAL Need N
since v16.5.0
A list of SearchSpaceSwitchTrigger objects. Each SearchSpaceSwitchTrigger object provides position in DCI of the bit field indicating search space switching flag for a serving cell or, if cellGroupsForSwitchList is configured, group of serving cells (see TS 38.213 [13], clause 10.4). If cellGroupsForSwitchList is configured, only one of the cells belonging to the same cell group is added/modified, and the configuration applies to all cells belonging to the cellGroupsForSwitchList (see TS 38.213 [13], clause 10.4). The network configures more than 4 SearchSpaceSwitchTrigger objects only if cellGroupsForSwitchList is not configured. The UE shall consider entries in switchTriggerToAddModList and in switchTriggerToAddModListSizeExt as a single list, i.e. an entry created using switchTriggerToAddModList can be modifed using switchTriggerToAddModListSizeExt and vice-versa.
switchTriggerToReleaseListSizeExt-r16
SEQUENCE (SIZE(1.. maxNrofAggregatedCellsPerCellGroupMinus4-r16)) OF ServCellIndex · OPTIONAL Need N
since v16.5.0
A list of SearchSpaceSwitchTriggers to be released. If cellGroupsForSwitchList is configured, the SearchSpaceSwitchTrigger is released for all serving cells belonging to the same CellGroupForSwitch . The UE shall consider entries in switchTriggerToReleaseList and in switchTriggerToReleaseListSizeExt as a single list, i.e. an entry created using switchTriggerToAddModList or switchTriggerToAddModListSizeExt can be deleted using switchTriggerToReleaseList or switchTriggerToReleaseListSizeExt .
co-DurationsPerCellToAddModList-r17
SEQUENCE (SIZE(1..maxNrofAggregatedCellsPerCellGroup)) OF CO-DurationsPerCell-r17 · OPTIONAL Need N
since v17.1.0
A list of CO-DurationsPerCell objects. If not configured, the UE uses the slot format indicator (SFI), if available, to determine the channel occupancy duration (see TS 38.213 [13], clause 11.1.1).

Used by (1)

Uses (10)

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