lteSCIResourceAllocation

SCI message physical resource blocks allocation

Syntax

prbset = lteSCIResourceAllocation(ue,scistr)

Description

prbset = lteSCIResourceAllocation(ue,scistr) returns a column vector containing the zero-based physical resource block (PRB) indices for the specified UE settings and as defined by the resource allocation substructure of the sidelink control information (SCI) message structure. The PRB indices created are for a single PSSCH transmission in a subframe within the PSSCH subframe pool.

For more information, see SCI Resource Allocation.

Examples

Allocate Nonhopping PSSCH Subframe Pool PRBs

Display the PRB allocations associated with the sequence of subframes in a PSSCH subframe pool.

Configure a nonhopping allocation of 3 PRBs according to the RIV calculation specified in TS 36.213, Section 8.1.1.

ue = struct('NSLRB',50);
sci = struct('FreqHopping',0);
sci.Allocation.RIV = 110;

Display an image of the PRBs used in each slot of each subframe in a pool of 10 PSSCH subframes.

subframeslots = zeros(ue.NSLRB,20);
for i = 0:9
    ue.NSubframePSSCH = i;
    prbSet = lteSCIResourceAllocation(ue,sci);
    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('PSSCH Subframe Pool')
ylabel('PRB Indices')

Allocate Type 2 Hopping PSSCH Subframe Pool PRBs

Configure a type 2 hopping allocation of 3 PRBs. Display the PRB allocations that are associated with the sequence of subframes in a PSSCH subframe pool.

Configure UE and SCI settings structures for a type 2 hopping allocation of 3 PRBs.

ue = struct('NSLRB',50);
ue.PSSCHHoppingParameter = 10;
ue.NSubbands = 2;
ue.PSSCHHoppingOffset = 1;
sci = struct('FreqHopping',1);
sci.Allocation.RIV = 110;
sci.Allocation.HoppingBits = 3;

Display an image of the PRBs used in each slot of each subframe in a pool of 10 PSSCH subframes.

subframeslots = zeros(ue.NSLRB,20);
for i = 0:9
    ue.NSubframePSSCH = i;
    prbSet = lteSCIResourceAllocation(ue,sci);
    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('PSSCH Subframe Pool')
ylabel('PRB Indices')

Allocate Type 1 Hopping PSSCH Subframe Pool PRBs

Configure a type 1 hopping allocation of 3 PRBs. Display the PRB allocations that are associated with the sequence of subframes in a PSSCH subframe pool.

Configure UE and SCI settings structures for a type 1 hopping allocation of 3 PRBs.

ue = struct('NSLRB',50);
sci = struct('FreqHopping',1);
sci.Allocation.RIV = 110;
sci.Allocation.HoppingBits = 1;

Display an image of the PRBs used in each slot of each subframe in a pool of 10 PSSCH subframes.

subframeslots = zeros(ue.NSLRB,20);
for i = 0:9
    ue.NSubframePSSCH = i;
    prbSet = lteSCIResourceAllocation(ue,sci);
    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('PSSCH Subframe Pool')
ylabel('PRB Indices')

Allocate Type 1 Hopping PSSCH Pool Restricting PRBs

Configure PRB pool restriction for transmission mode 2. Display the PRB allocations that are associated with the sequence of subframes in a PSSCH subframe pool.

Configure a UE settings structure with specified PRB indices. Default settings are used for other UE and SCI fields.

ue = struct('NSLRB',50);
ue.PRBPool = (30:49);
sci = struct('FreqHopping',1);

Display an image of the PRBs used in each slot of each subframe in a pool of 10 PSSCH subframes.

subframeslots = zeros(ue.NSLRB,20);
for i = 0:9
    ue.NSubframePSSCH = i;
    prbSet = lteSCIResourceAllocation(ue,sci);
    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('PSSCH Subframe Pool')
ylabel('PRB Indices')

Input Arguments

ue — User equipment settings

structure

User equipment settings, specified as a parameter structure containing these fields:

NSLRB — Number of sidelink resource blocks

integer scalar from 6 to 110

Number of sidelink resource blocks, specified as an integer scalar from 6 to 110.

Example: 6, which corresponds to a channel bandwidth of 1.4 MHz.

Data Types: double

NSubframePSSCH — PSSCH subframe number

integer scalar | optional

PSSCH subframe number in PSSCH subframe pool, specified as an integer scalar. ($$n_{\text{ssf}}^{\text{PSSCH}}$$)

Note

This parameter is required for SCI format 0 and frequency hopping. (scistr.SCIFormat = 'Format0' and scistr.FreqHopping = 1)

Data Types: double

PSSCHHoppingParameter — PSSCH hopping parameter

0 (default) | integer scalar from 0 to 510 | optional

PSSCH hopping parameter, specified as an integer scalar from 0 to 510. (SL-HoppingConfigComm-r12 {hoppingParameter-r12})

All values ≥ 504 are treated as 510.

Note

This parameter is required for SCI format 0 and frequency hopping. (scistr.SCIFormat = 'Format0' and scistr.FreqHopping = 1)

Data Types: double

NSubbands — Number of subbands

1 (default) | 2 | 4 | optional

Number of subbands, specified as 1, 2, or 4. (SL-HoppingConfigComm-r12 {numSubbands-r12})

Note

This parameter is required for SCI format 0 and frequency hopping. (scistr.SCIFormat = 'Format0' and scistr.FreqHopping = 1)

Data Types: double

PSSCHHoppingOffset — PSSCH hopping offset

0 (default) | integer scalar from 0 to 110 | optional

PSSCH hopping offset, specified as an integer scalar from 0 to 110. (SL-HoppingConfigComm-r12 {rb-Offset-r12})

Note

This parameter is required for SCI format 0 and frequency hopping. (scistr.SCIFormat = 'Format0' and scistr.FreqHopping = 1)

Data Types: double

PRBPool — PSSCH resource block pool

optional | zero-based integer vector | optional

PSSCH resource block pool (sidelink transmission mode 2), specified as a zero-based integer vector of indices giving the PRBs in the pool. If PRBPool is absent or empty, the pool is assumed to be the full transmission bandwidth.

Note

This parameter is required for SCI format 0 and frequency hopping. (scistr.SCIFormat = 'Format0' and scistr.FreqHopping = 1)

Data Types: double

PSSCHNSubchannels — Number of sub-channels in the V2X PSSCH resource pool

1 (default) | integer scalar from 1 to 110 | optional

Number of sub-channels in the V2X PSSCH resource pool, specified as an integer scalar from 1 to 110.

Note

This parameter is required for SCI format 1. (scistr.SCIFormat = 'Format1')

Data Types: double

PSSCHSubchannelsSize — Number of PRB in each sub-channel

4 (default) | integer scalar from 1 to 110 | optional

Number of PRB in each sub-channel, specified as an integer scalar from 1 to 110.

Note

This parameter is required for SCI format 1. (scistr.SCIFormat = 'Format1')

Data Types: double

PSSCHSubchannelsPRBStart — First PRB index associated with first sub-channel of the resource pool

0 (default) | integer scalar from 1 to 109 | optional

First PRB index associated with first sub-channel of the resource pool, specified as an integer scalar from 1 to 109.

Note

This parameter is required for SCI format 1. (scistr.SCIFormat = 'Format1')

Data Types: double

PSSCHAdjacency — Whether PSCCH and PSSCH are transmitted in adjacent PRB

'On' (default) | 'Off' | optional

Whether PSCCH and PSSCH are transmitted in adjacent PRB, specified as 'On' or 'Off'.

Note

This parameter is required for SCI format 1. (scistr.SCIFormat = 'Format1')

Data Types: double

FirstSubchannelIdx — First sub-channel index of PSSCH resource allocation

0 (default) | integer scalar from 1 to 109 | optional

First sub-channel index of PSSCH resource allocation, specified as an integer scalar from 1 to 109.

Note

This parameter is required for SCI format 1. (scistr.SCIFormat = 'Format1')

Data Types: double

Data Types: struct

scistr — Sidelink control information settings

structure

Sidelink control information settings, specified as a parameter structure containing these PRB allocation fields:

SCIFormat — SCI format type

'Format0' (default) | 'Format1'

SCI format type, specified as 'Format0' or 'Format1'.

Data Types: char | string

FreqHopping — Frequency hopping flag

0 (default) | 1

Frequency hopping flag, specified as 0 for nonhopping allocation type or 1 for hopping allocation type. When scistr.FreqHopping = 1, the hopping allocation type is signalled by scistr.Allocation.HoppingBits.

Note

This parameter is required for SCI format 0. (scistr.SCIFormat = 'Format0')

Data Types: double

Allocation — Resource allocation parameter substructure

structure | optional

Resource allocation parameter substructure, specified as a structure.

HoppingBits — Hopping bits

0 (default) | bit vector with 0, 1, or 2 bits

Hopping bits, specified as a bit vector with 0, 1, or 2 bits. The HoppingBits parameter signals the hopping type. For more information, see SCI Resource Allocation.

Note

This parameter is required for SCI format 0. (scistr.SCIFormat = 'Format0')

Data Types: double

RIV — Resource indication value

0 (default) | bit vector with 5 to 13 bits

Resource indication value, specified as a bit vector with 5 to 13 bits. The resource indication value assignment for sidelink follows the specifications for uplink, as modified in TS 36.213 [2], Sections 14.1.1.2 and 14.1.1.4. For more information, see SCI Resource Allocation.

Note

This parameter is required for SCI format 0. (scistr.SCIFormat = 'Format0')

Data Types: double

Data Types: struct

RIV — Resource indication value

bit vector with 0 to 13 bits | optional

Resource indication value, specified as a bit vector with 0 to 13 bits. The resource indication value assignment for sidelink follows the specifications for uplink, as modified in TS 36.213 [2], Sections 14.1.1.2 and 14.1.1.4. For more information, see SCI Resource Allocation.

Note

This parameter is required for SCI format 1. (scistr.SCIFormat = 'Format1')

Data Types: double

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 integer matrix of zero-based indices.

• When the allocation type defines one set of PRB indices to use in the first and second slots of the subframe, prbset is returned as an integer column vector.

• When the allocation type defines a different set of PRB indices in the first and second slots of the subframe, prbset is returned as two-column integer matrix.

The PRB indices created are for a single PSSCH transmission in a subframe within the PSSCH subframe pool.

More About

SCI Resource Allocation

Sidelink control information (SCI) resource allocation mapping is described in TS 36.211 [1], Section 9.3.6. The sciout structure returned by lteSCI can be directly used as the scistr structure input to lteSCIResourceAllocation. Using lteSCI creates a properly formatted SCI format 0 message, ensuring that the field values adhere to the underlying field bit lengths. The scistr field values are read modulo to the SCI message bit lengths. Any fields missing from scistr default to 0. PSSCH allocations are based on uplink resource allocation type 0 (see lteDCI, DCI format 0). In these allocations, the same single contiguous PRB allocation must be used for both slots in the subframe. As with uplink, for sidelink:

• A FreqHopping value of 1 signals a hopping allocation type. There are two types of hopping: type 1 PUSCH hopping and type 2 PUSCH hopping (frequency hopping with a predefined pattern). scistr.Allocation.HoppingBits signals the hopping type, as specified in TS 36.213 [2], Table 8.4-2.

• A FreqHopping value of 0 signals a nonhopping allocation type

Alternatively, you can use lteDCIResourceAllocation with a DCI format 5 message and the same message fields to generate the PSSCH allocations. This PSSCH allocation represents sidelink transmission mode 1, with the eNodeB using a DCI format 5 message to provide the transmitting UE with a PSSCH resource allocation.

References

[1] 3GPP TS 36.211. “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.

[2] 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 R2016b