FrequencyInfoDL
FrequencyInfoDL is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.
Definition
The IE FrequencyInfoDL provides basic parameters of a downlink carrier and transmission thereon.
FrequencyInfoDL ::= SEQUENCE {
absoluteFrequencySSB ARFCN-ValueNR OPTIONAL, -- Cond SpCellAdd
frequencyBandList MultiFrequencyBandListNR,
absoluteFrequencyPointA ARFCN-ValueNR,
scs-SpecificCarrierList SEQUENCE (SIZE (1..maxSCSs)) OF SCS-SpecificCarrier,
...,
[[
referenceCell-r18 ServCellIndex OPTIONAL -- Cond SSBlessSCell
]]
}Fields (5)
| Field | Description |
|---|---|
| absoluteFrequencySSB ARFCN-ValueNR · OPTIONAL Cond SpCellAdd | Frequency of the SSB to be used for this serving cell. SSB related parameters (e.g. SSB index) provided for a serving cell refer to this SSB frequency unless mentioned otherwise. The CD-SSB of the PCell is always on the sync raster. The SSB of the SCell supporting 12 PRB, 15 PRB or 20 PRB transmission bandwidth configuration as defined in TS 38.101-1 [15], TS 38.211 [16] and TS 38.213 [13] is always on the sync raster. Frequencies are considered to be on the sync raster if they are also identifiable with a GSCN value (see TS 38.101-1 [15] or TS 38.101-5 [75]). If the field is absent, the SSB related parameters should be absent, e.g. ssb-PositionsInBurst , ssb-periodicityServingCell and subcarrierSpacing in ServingCellConfigCommon IE. If the field is absent and od-ssb is absent in IE SCellConfig , or if the field is absent and od-ssb is present in IE SCellConfig but OD-SSB is not activated, the UE obtains timing reference from the intra-band SpCell or intra-band SCell as described in TS 38.213 [13], clause 4.1, or from the SpCell or an SCell indicated by referenceCell, or from the reference serving cell defined in TS 38.133 [14], if applicable. This is supported in case the SCell for which the UE obtains the timing reference is in the same or different frequency band as the cell (i.e. the SpCell or the SCell, respectively) from which the UE obtains the timing reference. If od-ssb is present in IE SCellConfig , the UE can obtain reference timing from OD-SSB when OD-SSB is transmitted. For PCell, this field corresponds to the CD-SSB. |
| frequencyBandList MultiFrequencyBandListNR | List containing only one frequency band to which this carrier(s) belongs. Multiple values are not supported. |
| absoluteFrequencyPointA ARFCN-ValueNR | Absolute frequency position of the reference resource block (Common RB 0). Its lowest subcarrier is also known as Point A (see TS 38.211 [16], clause 4.4.4.2). Note that the lower edge of the actual carrier is not defined by this field but rather in the scs-SpecificCarrierList . |
| scs-SpecificCarrierList SEQUENCE (SIZE (1..maxSCSs)) OF SCS-SpecificCarrier | A set of carriers for different subcarrier spacings (numerologies). Defined in relation to Point A. The network configures a scs-SpecificCarrier at least for each numerology (SCS) that is used e.g. in a BWP (see TS 38.211 [16], clause 5.3). |
| referenceCell-r18 ServCellIndex · OPTIONAL Cond SSBlessSCell since v18.0.0 | Indicates the reference cell, i.e. the cell which provides the timing reference and AGC source for the inter-band SSB-less SCell. If the reference cell is an SCell or PSCell, it should be an activated SCell or activated PSCell. If this field is absent for an inter-band SSB-less SCell, the reference serving cell is defined in TS 38.133 [14]. |