CSI-RS-ResourceMapping
CSI-RS-ResourceMapping is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.
Definition
The IE CSI-RS-ResourceMapping is used to configure the resource element mapping of a CSI-RS resource in time- and frequency domain.
CSI-RS-ResourceMapping ::= SEQUENCE {
frequencyDomainAllocation CHOICE {
row1 BIT STRING (SIZE (4)),
row2 BIT STRING (SIZE (12)),
row4 BIT STRING (SIZE (3)),
other BIT STRING (SIZE (6))
},
nrofPorts ENUMERATED {p1,p2,p4,p8,p12,p16,p24,p32},
firstOFDMSymbolInTimeDomain INTEGER (0..13),
firstOFDMSymbolInTimeDomain2 INTEGER (2..12) OPTIONAL, -- Need R
cdm-Type ENUMERATED {noCDM, fd-CDM2, cdm4-FD2-TD2, cdm8-FD2-TD4},
density CHOICE {
dot5 ENUMERATED {evenPRBs, oddPRBs},
one NULL,
three NULL,
spare NULL
},
freqBand CSI-FrequencyOccupation,
...
}Fields (15)
| Field | Description |
|---|---|
| frequencyDomainAllocation CHOICE { | Frequency domain allocation within a physical resource block in accordance with TS 38.211 [16], clause 7.4.1.5.3. The applicable row number in table 7.4.1.5.3-1 is determined by the frequencyDomainAllocation for rows 1, 2 and 4, and for other rows by matching the values in the column Ports, Density and CDMtype in table 7.4.1.5.3-1 with the values of nrofPorts , cdm-Type and density below and, when more than one row has the 3 values matching, by selecting the row where the column (k bar, l bar) in table 7.4.1.5.3-1 has indexes for k ranging from 0 to 2n-1 where n is the number of bits set to 1 in frequencyDomainAllocation . |
| row1 BIT STRING (SIZE (4)) | |
| row2 BIT STRING (SIZE (12)) | |
| row4 BIT STRING (SIZE (3)) | |
| other BIT STRING (SIZE (6)) | |
| nrofPorts ENUMERATED {p1,p2,p4,p8,p12,p16,p24,p32} | Number of ports (see TS 38.214 [19], clause 5.2.2.3.1). |
| firstOFDMSymbolInTimeDomain INTEGER (0..13) | Time domain allocation within a physical resource block. The field indicates the first OFDM symbol in the PRB used for CSI-RS. See TS 38.211 [16], clause 7.4.1.5.3. |
| firstOFDMSymbolInTimeDomain2 INTEGER (2..12) · OPTIONAL Need R | Time domain allocation within a physical resource block. See TS 38.211 [16], clause 7.4.1.5.3. |
| cdm-Type ENUMERATED {noCDM, fd-CDM2, cdm4-FD2-TD2, cdm8-FD2-TD4} | CDM type (see TS 38.214 [19], clause 5.2.2.3.1). |
| density CHOICE { | Density of CSI-RS resource measured in RE/port/PRB (see TS 38.211 [16], clause 7.4.1.5.3). Values 0.5 ( dot5 ), 1 ( one ) and 3 ( three ) are allowed for X=1, values 0.5 ( dot5 ) and 1 ( one ) are allowed for X=2, 16, 24 and 32, value 1 ( one ) is allowed for X=4, 8, 12. For density = 1/2, includes 1-bit indication for RB level comb offset indicating whether odd or even RBs are occupied by CSI-RS. |
| dot5 ENUMERATED {evenPRBs, oddPRBs} | |
| one NULL | |
| three NULL | |
| spare NULL | |
| freqBand CSI-FrequencyOccupation | Wideband or partial band CSI-RS, (see TS 38.214 [19], clause 5.2.2.3.1). |