PTRS-DownlinkConfig
PTRS-DownlinkConfig is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.
Definition
The IE PTRS-DownlinkConfig is used to configure downlink phase tracking reference signals (PTRS) (see TS 38.214 [19] clause 5.1.6.3)
PTRS-DownlinkConfig ::= SEQUENCE {
frequencyDensity SEQUENCE (SIZE (2)) OF INTEGER (1..276) OPTIONAL, -- Need S
timeDensity SEQUENCE (SIZE (3)) OF INTEGER (0..29) OPTIONAL, -- Need S
epre-Ratio INTEGER (0..3) OPTIONAL, -- Need S
resourceElementOffset ENUMERATED { offset01, offset10, offset11 } OPTIONAL, -- Need S
...,
[[
maxNrofPorts-r16 ENUMERATED {n1, n2} OPTIONAL -- Need R
]]
}Candidate change requests of v16.1.0
The CRs whose title or cover names this change, strong and likely matches only.
- CR 1696 r4 (strong): eMIMO corrections
Fields (5)
| Field | Description |
|---|---|
| frequencyDensity SEQUENCE (SIZE (2)) OF INTEGER (1..276) · OPTIONAL Need S | Presence and frequency density of DL PT-RS as a function of Scheduled BW. If the field is absent, the UE uses K_PT-RS = 2 (see TS 38.214 [19], clause 5.1.6.3, table 5.1.6.3-2). |
| timeDensity SEQUENCE (SIZE (3)) OF INTEGER (0..29) · OPTIONAL Need S | Presence and time density of DL PT-RS as a function of MCS. The value 29 is only applicable for MCS Table 5.1.3.1-1 (TS 38.214 [19]). If the field is absent, the UE uses L_PT-RS = 1 (see TS 38.214 [19], clause 5.1.6.3, table 5.1.6.3-1). |
| epre-Ratio INTEGER (0..3) · OPTIONAL Need S since v15.2.0 | EPRE ratio between PTRS and PDSCH. Value 0 corresponds to the codepoint "00" in tables 4.1-2 and 4.1-2A. Value 1 corresponds to codepoint "01", and so on. If the field is not provided, the UE applies value 0 (see TS 38.214 [19], clause 4.1). |
| resourceElementOffset ENUMERATED { offset01, offset10, offset11 } · OPTIONAL Need S | Indicates the subcarrier offset for DL PTRS. If the field is absent, the UE applies the value offset00 (see TS 38.211 [16], clause 7.4.1.2.2). |
| maxNrofPorts-r16 ENUMERATED {n1, n2} · OPTIONAL Need R since v16.0.0 | The maximum number of DL PTRS ports specified in TS 38.214 [19] (clause 5.1.6.3). 2 PT-RS ports can only be configured for a DL BWP that is configured, as specified in TS 38.214 [19] clause 5.1, with a mode where a single PDSCH has association between the DM-RS ports and the TCI states as defined in TS 38.214 [19] clause 5.1.6.2. |