NZP-CSI-RS-ResourceSet

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

NZP-CSI-RS-ResourceSet 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 v19.1.0 (2026-01)

Definition

The IE NZP-CSI-RS-ResourceSet is a set of Non-Zero-Power (NZP) CSI-RS resources (their IDs) and set-specific parameters.

NZP-CSI-RS-ResourceSet ::=          SEQUENCE {
    nzp-CSI-ResourceSetId               NZP-CSI-RS-ResourceSetId,
    nzp-CSI-RS-Resources                SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId,
    repetition                          ENUMERATED { on, off }                                                  OPTIONAL,   -- Need S
    aperiodicTriggeringOffset           INTEGER(0..6)                                                           OPTIONAL,   -- Need S
    trs-Info                            ENUMERATED {true}                                                       OPTIONAL,   -- Need R
    ...,
    [[
        aperiodicTriggeringOffset-r16       INTEGER(0..31)                                                          OPTIONAL   -- Need S
    ]],
    [[
        pdc-Info-r17                        ENUMERATED {true}                                                       OPTIONAL,  -- Need R
        cmrGroupingAndPairing-r17           CMRGroupingAndPairing-r17                                               OPTIONAL,  -- Need R
        aperiodicTriggeringOffset-r17       INTEGER (0..124)                                                        OPTIONAL,  -- Need S
        aperiodicTriggeringOffsetL2-r17     INTEGER(0..31)                                                          OPTIONAL   -- Need R
    ]],
    [[
        resourceType-r18                    ENUMERATED {periodic}                                                   OPTIONAL   -- Cond LTM
    ]],
    [[
        kdopp-r19                           SEQUENCE {
            numberOfResourceGroups-r19          ENUMERATED {n4, n8, n12},
            numberOfResourcesPerGroup-r19       ENUMERATED {n2, n3, n4}
        }                                                                                                           OPTIONAL,  -- Need R
        additionalOneSlotOffsetDoppler-r19  CHOICE {
            twoResourcesPerGroup-r19            BIT STRING(SIZE(2)),
            threeResourcesPerGroup-r19          BIT STRING(SIZE(3)),
            fourResourcesPerGroup-r19           BIT STRING(SIZE(4))
        }                                                                                                           OPTIONAL   -- Need R
    ]]
}

Fields (18)

Field	Description
nzp-CSI-ResourceSetId NZP-CSI-RS-ResourceSetId
nzp-CSI-RS-Resources SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId	NZP-CSI-RS-Resources associated with this NZP-CSI-RS resource set (see TS 38.214 [19], clause 5.2). If the NZP-CSI-RS-ResourceSet is indicated in a CSI-ResourceConfig indicated by resourcesForChannelMeasurement in a CSI-ReportConfig , if the codebookType in the codebookConfig in the CSI-ReportConfig is typeII-Doppler-r18 or typeII-DopplerPortSelection-r18 , there are at most 1 periodic or semi-persistent NZP CSI-RS resource and 4, 8 or 12 aperiodic NZP CSI-RS resources and if the codebookType is typeII-CJT-r18 or typeII-CJT-PortSelection-r18 , there are 1, 2, 3, or 4 aperiodic, periodic or semi-persistent NZP-CSI-RS resources, see TS 38.214 [19], clause 5.2.1.4.
repetition ENUMERATED { on, off } · OPTIONAL Need S	Indicates whether repetition is on/off. If the field is set to off or if the field is absent, the UE may not assume that the NZP-CSI-RS resources within the resource set are transmitted with the same downlink spatial domain transmission filter (see TS 38.214 [19], clauses 5.2.2.3.1 and 5.1.6.1.2). It can only be configured for CSI-RS resource sets which are associated with CSI-ReportConfig with report of L1 RSRP, L1 SINR or "no report". If NZP-CSI-RS-ResourceSet if configured in LTM-Candidate , the field can only be configured as off , if present.
aperiodicTriggeringOffset INTEGER(0..6) · OPTIONAL Need S	Offset X between the slot containing the DCI that triggers a set of aperiodic NZP CSI-RS resources and the slot in which the CSI-RS resource set is transmitted. For aperiodicTriggeringOffset , the value 0 corresponds to 0 slots, value 1 corresponds to 1 slot, value 2 corresponds to 2 slots, value 3 corresponds to 3 slots, value 4 corresponds to 4 slots, value 5 corresponds to 16 slots, value 6 corresponds to 24 slots. For aperiodicTriggeringOffset-r16 and aperiodicTriggeringOffset-r17 , the value indicates the number of slots. aperiodicTriggeringOffset-r17 is applicable to SCS 480 kHz and 960 kHz, and only the values of integer multiples of 4 are valid, i.e. 0, 4, 8, and so on. The network configures only one of the fields. When neither field is included, the UE applies the value 0. This field is not present in case NZP-CSI-RS-ResourcesSet is received as part of an LTM-Candidate IE.
trs-Info ENUMERATED {true} · OPTIONAL Need R	Indicates that the antenna port for all NZP-CSI-RS resources in the CSI-RS resource set is same. If the field is absent or released the UE applies the value false (see TS 38.214 [19], clause 5.2.2.3.1).
aperiodicTriggeringOffset-r16 INTEGER(0..31) · OPTIONAL Need S since v16.1.0	Offset X between the slot containing the DCI that triggers a set of aperiodic NZP CSI-RS resources and the slot in which the CSI-RS resource set is transmitted. For aperiodicTriggeringOffset , the value 0 corresponds to 0 slots, value 1 corresponds to 1 slot, value 2 corresponds to 2 slots, value 3 corresponds to 3 slots, value 4 corresponds to 4 slots, value 5 corresponds to 16 slots, value 6 corresponds to 24 slots. For aperiodicTriggeringOffset-r16 and aperiodicTriggeringOffset-r17 , the value indicates the number of slots. aperiodicTriggeringOffset-r17 is applicable to SCS 480 kHz and 960 kHz, and only the values of integer multiples of 4 are valid, i.e. 0, 4, 8, and so on. The network configures only one of the fields. When neither field is included, the UE applies the value 0. This field is not present in case NZP-CSI-RS-ResourcesSet is received as part of an LTM-Candidate IE.
pdc-Info-r17 ENUMERATED {true} · OPTIONAL Need R since v17.0.0	Indicates that this NZP-CSI-RS-ResourceSet, if configured also with trs-Info, is used for propagation delay compensation. The field can be present only if trs-info is present. The field can be present in only one NZP-CSI-RS-ResourceSet . If network configures this field for an NZP-CSI-RS-ResourceSet , the UE measures the UE Rx-Tx time difference based on resources configured in this resource set. This field is not present in case NZP-CSI-RS-ResourcesSet is received as part of an LTM-Candidate IE.
cmrGroupingAndPairing-r17 CMRGroupingAndPairing-r17 · OPTIONAL Need R since v17.0.0	Configures CMR groups and pairs. The first nrofResourcesGroup1 resources in the NZP-CSI-RS resource set belong to Group 1 and the remaining resources in the NZP-CSI-RS resource set belong to Group 2. nrofResourcesGroup1 is $K_{1}$ and the number of remaining resources in the NZP-CSI-RS resource set belonging to Group 2 is $K_{2}$ as specified in TS 38.214 clause 5.2.1.4.1. Maximum total number in Group 1 and Group 2 is 8 (see TS 38.214 [19], clauses 5.2.1.4.1 and 5.2.1.4.2). This field is not present in case NZP-CSI-RS-ResourcesSet is received as part of an LTM-Candidate IE.
aperiodicTriggeringOffset-r17 INTEGER (0..124) · OPTIONAL Need S since v17.1.0	Offset X between the slot containing the DCI that triggers a set of aperiodic NZP CSI-RS resources and the slot in which the CSI-RS resource set is transmitted. For aperiodicTriggeringOffset , the value 0 corresponds to 0 slots, value 1 corresponds to 1 slot, value 2 corresponds to 2 slots, value 3 corresponds to 3 slots, value 4 corresponds to 4 slots, value 5 corresponds to 16 slots, value 6 corresponds to 24 slots. For aperiodicTriggeringOffset-r16 and aperiodicTriggeringOffset-r17 , the value indicates the number of slots. aperiodicTriggeringOffset-r17 is applicable to SCS 480 kHz and 960 kHz, and only the values of integer multiples of 4 are valid, i.e. 0, 4, 8, and so on. The network configures only one of the fields. When neither field is included, the UE applies the value 0. This field is not present in case NZP-CSI-RS-ResourcesSet is received as part of an LTM-Candidate IE.
aperiodicTriggeringOffsetL2-r17 INTEGER(0..31) · OPTIONAL Need R since v17.1.0	Indicates triggering offset of aperiodic NZP CSI-RS resources used for fast activation of the SCell (see clause 5.2.1.5.3 of TS 38.214 [19]), when the NZP CSI-RS resources are activated by the MAC CE (see clause 5.9 of TS 38.321 [3]). The value indicates the number of slots. This field is not present in case NZP-CSI-RS-ResourcesSet is received as part of an LTM-Candidate IE.
resourceType-r18 ENUMERATED {periodic} · OPTIONAL Cond LTM since v18.0.0	Time domain behavior of resource configuration (see TS 38.214 [19], clause 5.2.1.2).
kdopp-r19 SEQUENCE { · OPTIONAL Need R since v19.0.0	The number of configured resource groups and number of NZP CSI-RS resources in each group. For numberOfResourceGroups , value n4 corresponds to 4 resource groups, value n8 corresponds to 8 resource groups and value n12 corresponds to 12 resource groups. For numberOfResourcesPerGroup , value n2 corresponds to 2 NZP CSI-RS resources per group, value n3 corresponds to 3 NZP CSI-RS resources per group and value n4 corresponds to 4 NZP CSI-RS resources per group. This field is only configured for codebook typeII-Doppler-r19 .
numberOfResourceGroups-r19 ENUMERATED {n4, n8, n12} since v19.0.0
numberOfResourcesPerGroup-r19 ENUMERATED {n2, n3, n4} since v19.0.0
additionalOneSlotOffsetDoppler-r19 CHOICE { · OPTIONAL Need R since v19.0.0	See TS 38.214 [19], clause 5.2.2.3.1. This field is only configured for codebook typeII-Doppler-r19 .
twoResourcesPerGroup-r19 BIT STRING(SIZE(2)) since v19.1.0
threeResourcesPerGroup-r19 BIT STRING(SIZE(3)) since v19.1.0
fourResourcesPerGroup-r19 BIT STRING(SIZE(4)) since v19.1.0

NZP-CSI-RS-ResourceSet

Definition

Fields (18)

Used by (3)

Uses (4)

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