lteSSSSIndices
SSSS resource element indices
Description
returns
a 124-by-1 complex column vector of resource element (RE) indices
for the secondary sidelink synchronization signal (SSSS) values given
the user equipment settings structure. By default, the indices are
returned in one-based linear indexing form. You can use this form
to directly index elements of a matrix representing the subframe resource
grid for antenna port 1020. For more information, see Secondary Sidelink Synchronization Signal Indexing.ind
= lteSSSSIndices(ue
)
Examples
Generate SSSS Indices
Generate SSSS values and indices. Write the values into the SSSS resource elements in a synchronization subframe (extended cyclic prefix) and display an image of their locations.
Create a user equipment settings structure and a resource grid that has a 10 MHz bandwidth and extended cyclic prefix.
ue.NSLRB = 50;
ue.CyclicPrefixSL = 'Extended';
ue.NSLID = 1;
subframe = lteSLResourceGrid(ue);
Generate SSSS indices and display the first five indices. Load the SSSS symbols into the resource grid. Display an image showing the SSSS symbol locations.
ind = lteSSSSIndices(ue); ind(1:5)
ans = 5x1 uint32 column vector
5670
5671
5672
5673
5674
subframe(ind) = lteSSSS(ue);
imagesc(100*abs(subframe))
axis xy
Generate Zero-Based SSSS Indices
Generate SSSS indices using zero-based indexing style. Compare these indices to one-based indices.
Create a user equipment settings structure that has a 10 MHz bandwidth and extended cyclic prefix.
ue.NSLRB = 50;
ue.CyclicPrefixSL = 'Extended';
ue.NSLID = 1;
Generate SSSS zero-based indices and view the first five indices.
ind = lteSSSSIndices(ue,'0based');
s = size(ind)
s = 1×2
124 1
ind(1:5)
ans = 5x1 uint32 column vector
5669
5670
5671
5672
5673
Generate SSSS one-based indices and view the first five indices.
ind = lteSSSSIndices(ue,'1based');
s = size(ind)
s = 1×2
124 1
ind(1:5)
ans = 5x1 uint32 column vector
5670
5671
5672
5673
5674
For zero-based indexing, the first assigned index is one lower than the one-based indexing style.
Input Arguments
ue
— User equipment settings
structure
User equipment settings, specified as a structure. ue
contains
the following 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
CyclicPrefixSL
— Cyclic prefix length
'Normal'
(default) | 'Extended'
| optional
Cyclic prefix length, specified as 'Normal'
or 'Extended'
.
Data Types: char
| string
opts
— Output format options for resource element indices
character vector | cell array of character vectors | string array
Output format options for resource element indices, specified as a character vector, cell
array of character vectors, or string array. For convenience, you can
specify several options as a single character vector or string scalar by a
space-separated list of values placed inside the quotes. Values for
opts
when specified as a character vector include
(use double quotes for string) :
Category | Options | Description |
---|---|---|
Indexing style |
| The returned indices are in linear index style. |
| The returned indices are in | |
Index base |
| The returned indices are one-based. |
| The returned indices are zero-based. |
Example: 'ind 1based'
, "ind 1based"
,
{'ind','1based'}
, or ["ind","1based"]
specify
the same formatting options.
Data Types: char
| string
| cell
Output Arguments
ind
— SSSS resource element indices
integer column vector | three-column integer matrix
SSSS resource element indices, returned as an integer column
vector or a three-column integer matrix. This output is generated
using the cell-wide settings structure, ue
. For
more information, see Secondary Sidelink Synchronization Signal Indexing.
Data Types: uint32
More About
Secondary Sidelink Synchronization Signal Indexing
Use the indexing function, lteSSSSIndices
, and the corresponding sequence
function, lteSSSS
, to populate
the resource grid for the desired subframe number. The SSSS values
are output by lteSSSS
, ordered
as they should be mapped, applying frequency-first mapping into the
resource elements of the adjacent symbols using lteSSSSIndices
.
When indexing is zero-based, the SC-FDMA symbols used are {11,12}
for normal cyclic prefix and {9, 10} for extended cyclic prefix.
Note
The indicated symbol indices are based on TS 36.211, Section 9.7. However to align with the LTE Toolbox™ subframe orientation, these indices are expanded from symbol index per slot to symbol index per subframe.
For more information on mapping symbols to the resource element grid, see Resource Grid Indexing.
Secondary Sidelink Synchronization Signal
The secondary sidelink synchronization signal (SSSS) is transmitted in the
central 62 resource elements of two adjacent SC-FDMA symbols in a synchronization subframe.
The same sequence of 62 complex values is repeated in each of the symbols, resulting in a
124-by-1 element vector returned by the lteSSSS
function. The values of this sequence are ordered as they should be
mapped into the resource elements of the adjacent symbols using lteSSSSIndices
. If a terminal is transmitting SSSS then it should be sent
every 40 ms for D2D sidelink or every 160 ms for V2X sidelink, with the exact subframe
dependent on the RCC signaled subframe number offset
(syncOffsetIndicator-r12). The SSSS is sent on antenna port 1020,
along with the primary sidelink synchronization signal (PSSS). A synchronization subframe
also contains the PSBCH, which is sent on antenna port 1010. The transmission power of the
SSSS symbols should be the same as the PSBCH therefore they should be scaled by in a subframe. No PSCCH or PSSCH transmission will occur in a sidelink
subframe configured for synchronization purposes.
As specified in TS 36.211, Section 9.7, the SSSS identity assignment
depends on the network coverage. The set of all is
divided into two sets, id_net {0, ..., 167} and id_oon {168, ...,
335}, which are used by terminals that are in-network and out-of-network
coverage, respectively. The sidelink physical layer cell identity
number, ,
corresponds to the lteSSSS
input
UE settings structure field ue
.NSLID
.
Within each set, all identities result in the same SSSS. For an in-network
terminal, the ue
.NSLID
value
corresponds to the RRC sidelink synchronization signal identity (slssid-r12)
associated with the cell.
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.
Version History
Introduced in R2016b
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