DMRS-DownlinkConfig
DMRS-DownlinkConfig is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.
Definition
The IE DMRS-DownlinkConfig is used to configure downlink demodulation reference signals for PDSCH.
DMRS-DownlinkConfig ::= SEQUENCE {
dmrs-Type ENUMERATED {type2} OPTIONAL, -- Need S
dmrs-AdditionalPosition ENUMERATED {pos0, pos1, pos3} OPTIONAL, -- Need S
maxLength ENUMERATED {len2} OPTIONAL, -- Need S
scramblingID0 INTEGER (0..65535) OPTIONAL, -- Need S
scramblingID1 INTEGER (0..65535) OPTIONAL, -- Need S
phaseTrackingRS SetupRelease { PTRS-DownlinkConfig } OPTIONAL, -- Need M
...,
[[
dmrs-Downlink-r16 ENUMERATED {enabled} OPTIONAL -- Need R
]],
[[
dmrs-TypeEnh-r18 ENUMERATED {enabled} OPTIONAL -- Need R
]]
}Fields (8)
| Field | Description |
|---|---|
| dmrs-Type ENUMERATED {type2} · OPTIONAL Need S | Selection of the DMRS type to be used for DL (see TS 38.211 [16], clause 7.4.1.1.1). If the field is absent, the UE uses DMRS type 1. |
| dmrs-AdditionalPosition ENUMERATED {pos0, pos1, pos3} · OPTIONAL Need S | Position for additional DM-RS in DL, see Tables 7.4.1.1.2-3 and 7.4.1.1.2-4 in TS 38.211 [16]. If the field is absent, the UE applies the value pos2. See also clause 7.4.1.1.2 for additional constraints on how the network may set this field depending on the setting of other fields. |
| maxLength ENUMERATED {len2} · OPTIONAL Need S | The maximum number of OFDM symbols for DL front loaded DMRS. len1 corresponds to value 1. len2 corresponds to value 2. If the field is absent, the UE applies value len1 . If set to len2 , the UE determines the actual number of DM-RS symbols by the associated DCI. (see TS 38.211 [16], clause 7.4.1.1.2). |
| scramblingID0 INTEGER (0..65535) · OPTIONAL Need S | DL DMRS scrambling initialization (see TS 38.211 [16], clause 7.4.1.1.1). When the field is absent the UE applies the value physCellId configured for this serving cell. |
| scramblingID1 INTEGER (0..65535) · OPTIONAL Need S | DL DMRS scrambling initialization (see TS 38.211 [16], clause 7.4.1.1.1). When the field is absent the UE applies the value physCellId configured for this serving cell. |
| phaseTrackingRS SetupRelease { PTRS-DownlinkConfig } · OPTIONAL Need M | Configures downlink PTRS. If the field is not configured, the UE assumes that downlink PTRS are absent. See TS 38.214 [19] clause 5.1.6.3. |
| dmrs-Downlink-r16 ENUMERATED {enabled} · OPTIONAL Need R since v16.0.0 | This field indicates whether low PAPR DMRS is used, as specified in TS38.211 [16], clause 7.4.1.1.1. |
| dmrs-TypeEnh-r18 ENUMERATED {enabled} · OPTIONAL Need R since v18.0.0 | This field is used in TS 38.211 [16], clause 7.4.1.1.2. |