lteDCIResourceAllocation
DCI message physical resource blocks allocation
Syntax
Description
[
returns a matrix containing the zero-based physical resource block (PRB) indices
prbset
,nrbg
,rbgsize
]
= lteDCIResourceAllocation(enbue
,dcistr
)prbset
, the number of resource block groups
nrbg
, and the resource block group size
rbgsize
, for the specified DCI message settings structure
enbue
and DCI message structure
dcistr
.
TS 36.213 [1] specifies resource allocation types used for downlink, uplink and sidelink. For more information, see Resource Allocation Types.
If you specify DCI Format 0, Format 4, or Format 5 in dcistr
.
DCIFormat
,
the function sets the system bandwidth based on the number of uplink
resource blocks, enbue
.
NULRB
.
If you do not specify enbue
.
NULRB
,
the function sets the system bandwidth based on the number of downlink
resource blocks, enbue
.
NDLRB
.
For all other formats, the function first checks enbue
.
NDLRB
for
the number of resource blocks. For more information, see Specifying Number of Resource Blocks.
[
returns outputs
prbset
,nrbg
,rbgsize
]
= lteDCIResourceAllocation(dcistr
)prbset
, nrbg
, and
rbgsize
as above, except the fields described in structure
enbue
must be present as part of
dcistr
.
Calling lteDCIResourceAllocation
specifying
the dcistr
structure as the only input argument
is not recommended because this signature will be removed in a future
release.
Examples
Get Allocated PRB Indices for DCI Message
Allocate DCI resource and shows the allocation of the DCI resources.
Create a DCI message structure with a system bandwidth of 50 resource blocks and DCI Format 1A.
enb = struct('NDLRB',50); dciStr = lteDCI(enb,struct('DCIFormat','Format1A','AllocationType',1));
Return allocated physical resource block indices, the number of resource block groups, and the resource block group size.
[prbSet, nrBg, rbgSize] = lteDCIResourceAllocation(enb,dciStr)
prbSet = 1x2 uint64 row vector
0 27
nrBg = int32
17
rbgSize = int32
3
Display Uplink PRB Allocation Type 1
Display the PRB allocations associated with the sequence of subframes in a frame for DCI Format 0 and uplink resource allocation type 1.
Configure a type 1 uplink resource allocation (multi-cluster). TS 36.213, Section 8.1.2 describes the resource indication value (RIV) determination.
enbue = struct('NDLRB',50); dcistr = lteDCI(enbue,struct('DCIFormat','Format0','AllocationType',1)); dcistr.Allocation.RIV = 1;
Display an image of the PRBs used in each slot of each subframe in a frame.
Create a
subframeslots
matrix full of zeros. There are 20 slots per frame, specifically two slots per subframe and ten subframes per frame.
Loop through assigning a PRB set of indices for each subframe. Also assign a value in
subframeslots
for each occupied PRB index.
subframeslots = zeros(enbue.NDLRB,20); for i = 0:9 enbue.NSubframe = i; prbSet = lteDCIResourceAllocation(enbue,dcistr); prbSet = repmat(prbSet,1,2/size(prbSet,2)); for s = 1:2 subframeslots(prbSet(:,s)+1,2*i+s) = 20+s*20; end end imagesc(subframeslots); axis xy; xlabel('Subframe Slots'); ylabel('PRB Indices');
Observe from the image that the same set of PRB indices is used in each slot.
Display Uplink Hopping PRB Allocation
Display the PRB allocations associated with the sequence of subframes in a frame for an uplink resource allocation with hopping.
Configure a type 1 uplink resource allocation that has type 0 hopping and slot and subframe hopping.
enbue = struct('NDLRB',50,'NCellID',0); dcistr = lteDCI(enbue,struct('DCIFormat','Format0','AllocationType',0,... 'FreqHopping',1)); dcistr.Allocation.HoppingBits = 0; dcistr.Allocation.RIV = 110; enbue.PUSCHHopping = 'InterAndIntra'; enbue.MacTxNumber = 0; enbue.NSubbands = 1; enbue.PUSCHHoppingOffset = 10;
Display an image of the PRBs used in each slot of each subframe in a frame.
Create a
subframeslots
matrix full of zeros. There are 20 slots per frame, specifically two slots per subframe and ten subframes per frame.Loop through assigning a PRB set of indices for each subframe. Also assign a value in
subframeslots
for each occupied PRB index.
subframeslots = zeros(enbue.NDLRB,20); for i = 0:9 enbue.NSubframe = i; prbSet = lteDCIResourceAllocation(enbue,dcistr); prbSet = repmat(prbSet,1,2/size(prbSet,2)); for s = 1:2 subframeslots(prbSet(:,s)+1,2*i+s) = 20+s*20; end end imagesc(subframeslots) axis xy xlabel('Subframe Slots') ylabel('PRB Indices')
Observe from the image that the occupied PRB indices hops in odd and even slots.
Input Arguments
enbue
— DCI message settings
structure
DCI message settings, specified as a structure. enbue
can
contain the following fields.
Parameter Field | Required or Optional | Values | Description |
---|---|---|---|
NDLRB | Required | Scalar integer from 6 to 110 | Number of downlink resource blocks () |
CellRefP | Optional | 1, 2, 4 | Number of cell-specific reference signal (CRS) antenna ports |
DuplexMode | Optional |
| Duplexing mode, specified as one of the following:
|
The following parameters
apply when | |||
NULRB | Required | Scalar integer from 6 to 110 | Number of uplink resource blocks. () |
The following parameters
apply when | |||
NCellID | Required | Integer from 0 to 503 | Physical layer cell identity |
NSubframe | Required | 0 (default), nonnegative scalar integer | Subframe number |
NFrame | Required | 0 (default), nonnegative scalar integer | Frame number |
PUSCHHopping | Optional |
| Uplink subframe hopping mode |
MacTxNumber | Optional | Scalar integer from 0 (default) to 27 | Number of the current MAC (re-)transmission, CURRENT_TX_NB |
NSubbands | Optional | 1 (default), 2, 3, or 4 | Number of subbands. |
PUSCHHoppingOffset | Optional | Scalar integer from 0 (default) to 98 | PUSCH hopping offset |
The following parameters
apply for DCI Format 5 ( | |||
NULRB | Required | Scalar integer from 6 to 110 | Number of uplink resource blocks. () |
The following parameters
apply for DCI Format 5 ( | |||
NSubframePSSCH | Required | Integer | Subframe number in PSSCH subframe pool |
PSSCHHoppingParameter | Optional | Integer from 0 (default) to 510. All values ≥ 504 are set to 510. | PSSCH hopping parameter |
NSubbands | Optional | 1, 2, or 4 | Number of subbands |
PSSCHHoppingOffset | Optional | Integer from 0 (default) to 110 | PSSCH hopping offset |
PRBPool | Optional | Integer vector | PSSCH resource block pool (sidelink transmission mode 2). A vector of zero-based indices giving the PRBs in the pool. If absent or empty then the pool is assumed to be the full transmission bandwidth |
The following
parameters apply for DCI Format 5A
( | |||
PSSCHNSubchannels | Optional | Integer from 1 (default) to 110 |
Number of sub-channels in the V2X PSSCH resource pool |
PSSCHSubchannelSize | Optional | Integer from 1 to 110. Default value is 4. | Number of PRB in each sub-channel |
PSSCHSubchannelPRBStart | Optional | Integer from 0 (default) to 109 |
First PRB index associated with first sub-channel of the resource pool |
PSSCHAdjacency | Optional |
|
Whether PSCCH and PSSCH are transmitted in adjacent PRB |
Data Types: struct
dcistr
— DCI message structure
structure
DCI message structure, returned as a structure whose fields match those of the associated DCI format.
The field names associated with dcistr
are
dependent on the DCI format. The format is expected to be one of the
formats generated by lteDCI
. The
LTE standard defines resource allocations types for downlink, uplink,
and sidelink. For more information, see Resource Allocation Types
The following table details the DCI formats and accompanying dcistr
parameter
fields.
DCI Formats | dciout Fields | Size | Description |
---|---|---|---|
'Format0' | DCIFormat | - | 'Format0' |
CIF | 0 or 3 bits | Carrier indicator field | |
FreqHopping | 1 bit | PUSCH frequency hopping flag | |
Allocation | Varies | Resource block assignment/allocation | |
ModCoding | 5 bits | Modulation, coding scheme, and redundancy version | |
NewData | 1 bit | New data indicator | |
TPC | 2 bits | PUSCH TPC command | |
CShiftDMRS | 3 bits | Cyclic shift for DM RS | |
TDDIndex | 2 bits | For TDD config 0, this field is the Uplink Index. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
CSIRequest | 1, 2, or 3 bits | CSI request | |
SRSRequest | 0 or 1 bit | SRS request. This field can only be present in DCI formats scheduling PUSCH which are mapped onto the UE specific search space given by the C-RNTI | |
AllocationType | 1 bit | Resource allocation type, only present if ≤. | |
'Format1' | DCIFormat | - | 'Format1' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | Resource allocation header: type 0, type 1. If downlink bandwidth is ≤10 PRBs there is no resource allocation header and resource allocation type 0 is assumed. | |
Allocation | Varies | Resource block assignment/allocation | |
ModCoding | 5 bits | Modulation and coding scheme | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
NewData | 1 bit | New data indicator | |
RV | 2 bits | Redundancy version | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format1A' | DCIFormat | - | 'Format1A' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | VRB assignment flag: 0 (localized), 1 (distributed) | |
Allocation | Varies | Resource block assignment/allocation | |
ModCoding | 5 bits | Modulation and coding scheme | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
NewData | 1 bit | New data indicator | |
RV | 2 bits | Redundancy version | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
SRSRequest | 0 or 1 bit | SRS request. This field can only be present in DCI formats scheduling PUSCH which are mapped onto the UE specific search space given by the C-RNTI | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format1B' | DCIFormat | - | 'Format1B' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | VRB assignment flag: 0 (localized), 1 (distributed) | |
Allocation | Varies | Resource block assignment/allocation | |
ModCoding | 5 bits | Modulation and coding scheme | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
NewData | 1 bit | New data indicator | |
RV | 2 bits | Redundancy version | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
TPMI | 2 bits for two antennas 4 bits for four antennas | PMI information | |
PMI | 1 bit | PMI confirmation | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format1C' | DCIFormat | - | 'Format1C' |
Allocation | Varies | Resource block assignment/allocation | |
ModCoding | 5 bits | Modulation and coding scheme | |
'Format1D' | DCIFormat | - | 'Format1D' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | VRB assignment flag: 0 (localized), 1 (distributed) | |
Allocation | Varies | Resource block assignment/allocation | |
ModCoding | 5 bits | Modulation and coding scheme | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
NewData | 1 bit | New data indicator | |
RV | 2 bits | Redundancy version | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
TPMI | 2 bits for two antennas 4 bits for four antennas | Precoding TPMI information | |
DlPowerOffset | 1 bit | Downlink power offset | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format2' | DCIFormat | - | 'Format2' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | Resource allocation header: type 0, type 1. If downlink bandwidth is ≤10 PRBs there is no resource allocation header and resource allocation type 0 is assumed. | |
Allocation | Varies | Resource block assignment/allocation | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
SwapFlag | 1 bit | Transport block to codeword swap flag | |
ModCoding1 | 5 bits | Modulation and coding scheme for transport block 1 | |
NewData1 | 1 bit | New data indicator for transport block 1 | |
RV1 | 2 bits | Redundancy version for transport block 1 | |
ModCoding2 | 5 bits | Modulation and coding scheme for transport block 2 | |
NewData2 | 1 bit | New data indicator for transport block 2 | |
RV2 | 2 bits | Redundancy version for transport block 2 | |
PrecodingInfo | 3 bits for two antennas 6 bits for four antennas | Precoding information | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format2A' | DCIFormat | - | 'Format2A' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | Resource allocation header: type 0, type 1. If downlink bandwidth is ≤10 PRBs there is no resource allocation header and resource allocation type 0 is assumed. | |
Allocation | Varies | Resource block assignment/allocation | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
SwapFlag | 1 bit | Transport block to codeword swap flag | |
ModCoding1 | 5 bits | Modulation and coding scheme for transport block 1 | |
NewData1 | 1 bit | New data indicator for transport block 1 | |
RV1 | 2 bits | Redundancy version for transport block 1 | |
ModCoding2 | 5 bits | Modulation and coding scheme for transport block 2 | |
NewData2 | 1 bit | New data indicator for transport block 2 | |
RV2 | 2 bits | Redundancy version for transport block 2 | |
PrecodingInfo | 0 bits for two antennas 2 bits for four antennas | Precoding information | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format2B' | DCIFormat | - | 'Format2B' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | Resource allocation header: type 0, type 1. If downlink bandwidth is ≤10 PRBs there is no resource allocation header and resource allocation type 0 is assumed. | |
Allocation | Varies | Resource block assignment/allocation | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
ScramblingId | 1 bit | Scrambling identity | |
ModCoding1 | 5 bits | Modulation and coding scheme for transport block 1 | |
NewData1 | 1 bit | New data indicator for transport block 1 | |
RV1 | 2 bits | Redundancy version for transport block 1 | |
ModCoding2 | 5 bits | Modulation and coding scheme for transport block 2 | |
NewData2 | 1 bit | New data indicator for transport block 2 | |
RV2 | 2 bits | Redundancy version for transport block 2 | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format2C' | DCIFormat | - | 'Format2C' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | Resource allocation header: type 0, type 1. If downlink bandwidth is ≤10 PRBs there is no resource allocation header and resource allocation type 0 is assumed. | |
Allocation | Varies | Resource block assignment/allocation | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
TxIndication | 3 bits | Antenna ports, scrambling identity, and number of layers indicator | |
SRSRequest | Varies | SRS request. Only present for TDD. | |
ModCoding1 | 5 bits | Modulation and coding scheme for transport block 1 | |
NewData1 | 1 bit | New data indicator for transport block 1 | |
RV1 | 2 bits | Redundancy version for transport block 1 | |
ModCoding2 | 5 bits | Modulation and coding scheme for transport block 2 | |
NewData2 | 1 bit | New data indicator for transport block 2 | |
RV2 | 2 bits | Redundancy version for transport block 2 | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format2D' | DCIFormat | - | 'Format2D' |
CIF | 0 or 3 bits | Carrier indicator field | |
AllocationType | 1 bit | Resource allocation header: type 0, type 1. If downlink bandwidth is ≤10 PRBs there is no resource allocation header and resource allocation type 0 is assumed. | |
Allocation | Varies | Resource block assignment/allocation | |
TPCPUCCH | 2 bits | PUCCH TPC command | |
TDDIndex | 2 bits | For TDD config 0, this field is not used. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
HARQNo | 3 bits (FDD) 4 bits (TDD) | HARQ process number | |
TxIndication | 3 bits | Antenna ports, scrambling identity, and number of layers indicator | |
SRSRequest | Varies | SRS request. Only present for TDD. | |
ModCoding1 | 5 bits | Modulation and coding scheme for transport block 1 | |
NewData1 | 1 bit | New data indicator for transport block 1 | |
RV1 | 2 bits | Redundancy version for transport block 1 | |
ModCoding2 | 5 bits | Modulation and coding scheme for transport block 2 | |
NewData2 | 1 bit | New data indicator for transport block 2 | |
RV2 | 2 bits | Redundancy version for transport block 2 | |
REMappingAndQCL | 2 bits | PDSCH RE Mapping and Quasi-Co-Location Indicator | |
HARQACKResOffset | 2 bits | HARQ-ACK resource offset. Present when this format is carried by EPDCCH. Not present when this format is carried by PDCCH | |
'Format3' | DCIFormat | - | 'Format3' |
TPCCommands | Varies | TPC commands for PUCCH and PUSCH | |
'Format3A' | DCIFormat | - | 'Format3A' |
TPCCommands | Varies | TPC commands for PUCCH and PUSCH | |
'Format4' | DCIFormat | - | 'Format4' |
CIF | 0 or 3 bits | Carrier indicator field | |
Allocation | Varies | Resource block assignment/allocation | |
TPC | 2 bits | PUSCH TPC command | |
CShiftDMRS | 3 bits | Cyclic shift for DM-RS | |
TDDIndex | 2 bits | For TDD config 0, this field is Uplink Index. For TDD config 1–6, this field is the Downlink Assignment Index. Not present for FDD. | |
CSIReq | Varies | CSI request | |
SRSRequest | 2 bits | SRS request | |
AllocationType | 1 bit | Resource allocation header type 0 or type 1. | |
ModCoding | 5 bits | Modulation, coding scheme, and redundancy version | |
NewData | 1 bit | New data indicator | |
ModCoding1 | 5 bits | Modulation and coding scheme for transport block 1 | |
NewData1 | 1 bit | New data indicator for transport block 1 | |
ModCoding2 | 5 bits | Modulation and coding scheme for transport block 2 | |
NewData2 | 1 bit | New data indicator for transport block 2 | |
PrecodingInfo | 3 bits for two antennas 6 bits for four antennas | Precoding information | |
'Format5' | DCIFormat | - | 'Format5' |
PSCCHResource | 6 bits | Resource for PSCCH | |
TPC | 1 bit | TPC command for PSCCH and PSSCH | |
FreqHopping | 1 bit | Frequency hopping flag | |
Allocation | Varies | Resource block assignment and hopping resource allocation | |
TimeResourcePattern | 7 bits | Time resource pattern | |
'Format5A' | DCIFormat | - | 'Format5A' |
CIF | 3 bits | Carrier indicator | |
FirstSubchannelIdx | Lowest index of the subchannel allocation to the initial transmission | ||
RIV | from 0 to 13 bits, | Resource indication value | |
TimeGap | 4 bits |
Time gap between initial transmission and retransmission | |
SLIndex | 2 bits | SL SPS configuration index |
Data Types: struct
Output Arguments
prbset
— Physical resource block indices
nonnegative integer column-vector | nonnegative integer column-matrix
Physical resource block indices, returned as a nonnegative integer
column-vector or N-by-2 matrix of zero-based indices.
The returned prbset
will be a single column vector
or a two-column matrix depending on whether the allocation type defines
a different set of PRB indices in the first and second slots of the
subframe.
Data Types: uint64
nrbg
— Number of resource block groups in the allocation
integer
Number of resource block groups in the allocation, returned as an integer.
Data Types: int32
rbgsize
— Resource block group size
integer
Number of resource blocks in a group, returned as an integer.
Data Types: int32
More About
Resource Allocation Types
The LTE standard specifies resource allocation
types used for downlink, uplink and sidelink. For a detailed description
of the resource allocation types, see lteDCI
.
For downlink, the LTE standard specifies three resource allocation types: type 0, 1, and 2. In terms of the DCI formats, formats 1, 2, 2A, 2B, 2C , and 2D can use either resource allocation type 0 or type 1, with the choice signalled by
dcistr.AllocationType
=0 anddcistr.AllocationType
=1 respectively. DCI formats 1A, 1B, 1C, and 1D use resource allocation type 2, which can be configured to be localized or distributed across resource blocks, signalled bydcistr.AllocationType
=0 anddcistr.AllocationType
=1 respectively.For uplink allocations (signaled in DCI format 0 messages), the allocation type is either hopping or non-hopping, signalled by
dcistr.FreqHopping
=1 anddcistr.FreqHopping
=0, respectively.For hopping allocations, there are two types of hopping: type 1 PUSCH hopping and type 2 PUSCH hopping (frequency hopping with a predefined pattern). The hopping type is signalled by
dcistr.Allocation.HoppingBits
as described in TS 36.213 [1], Table 8.4-2.For non-hopping uplink allocations, there are two types of resource allocation: type 0 and type 1. These are signalled by
dcistr.AllocationType
=0 anddcistr.AllocationType
=1 respectively. In case of DCI format 0 and uplink resource allocation type 1, the concatenation of the frequency hopping flag field (dcistr.FreqHopping
) and the resource block assignment and hopping resource allocation field provides the resource allocation field (dcistr.Allocation
). Type 0 allocations create a single contiguous set of PRB, whereas type 1 can create two contiguous PRB sets. The DCI format 4 messages can only signal non-hopping resource allocations type 0 and type 1.
For D2D sidelink PSSCH (signaled by DCI format 5 messages), allocations are the same as uplink PUSCH allocation type 0, both non-hopping and hopping, but with a different set of additional parameters required in the hopping case. Details for sidelink transmission mode 1 and mode 2 are specified in TS 36.213 [1], Sections 14.1.1.2 and 14.1.1.4 respectively.
Sidelink V2X PSSCH allocations (signalled by DCI format 5A messages when in sidelink transmission mode 3) create a single contiguous set of PRB using one or more sub-channels. See TS 36.213 [1], sections 14.1.1.4A and 14.1.1.4B for sidelink transmission mode 3 and mode 4 respectively. TM2 and TM4 use autonomous scheduling and therefore do not employ DCI messages from the eNodeB to deliver the transmission grants.
All allocations define a single set of PRB for both slots in
a subframe (prbset
is a column vector) except
for the distributed resource allocation type 2 and uplink hopping
allocations, where different PRB sets are used across the slot pair.
The allocation type may also define a minimum unit of resource
block allocation, which is defined by the resource block group size, rbgsize
.
This specifies the number of resource blocks in a group. There are nrbg
resource
block groups in the allocation.
Specifying Number of Resource Blocks
The number of resource blocks specifies the
uplink and downlink bandwidth. The LTE Toolbox™ implementation
assumes symmetric link bandwidth unless you specifically assign different
values to NULRB
and NDLRB
. If
the number of resource blocks is initialized in only one link direction,
then the initialized number of resource blocks (NULRB
or NDLRB
)
is used for both uplink and downlink. When this mapping is used, no
warning is displayed. An error occurs if NULRB
and NDLRB
are
both undefined.
References
[1] 3GPP TS 36.213. “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.
Version History
Introduced in R2014a
See Also
lteDCI
| ltePDCCH
| lteDLSCH
| lteEPDCCH
| lteSCIResourceAllocation
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