lteSSSS
Secondary sidelink synchronization signal
Syntax
Description
returns
s
= lteSSSS(ue
)s
, a column vector containing the secondary sidelink
synchronization signal (SSSS) values for user equipment settings
ue
. For more information, see Secondary Sidelink Synchronization Signal.
Examples
Generate SSSS
Generate and plot the BPSK sidelink secondary synchronization signal values for NSLID = 10.
ssss = lteSSSS(struct('NSLID',10));
scatterplot(ssss)
grid
Generate All SSSS Sequences
Generate all possible SSSS sequences, contained as columns in a 124-by-336 matrix.
ssssfn = @(x)lteSSSS(struct('NSLID',x)); allssss = cell2mat(arrayfun(ssssfn,[0:335],'UniformOutput',false));
Generate All SSSSs for V2X
Generate all possible SSSSs for V2X sidelink.
sfn = @(x)lteSSSS(struct('NSLID',x,'SidelinkMode','V2X')); s = cell2mat(arrayfun(sfn,0:335,'UniformOutput',false));
Input Arguments
ue
— User equipment settings
structure
User equipment settings, specified as a structure containing the following fields.
SidelinkMode
— Sidelink mode
'D2D'
(default) | 'V2X'
| optional
Sidelink mode, specified as 'D2D'
or
'V2X'
.
Data Types: char
| string
NSLID
— Physical layer sidelink synchronization identity
integer in the interval [0, 335]
Physical layer sidelink synchronization identity, specified as an integer in the interval [0, 335].
For more information, see Secondary Sidelink Synchronization Signal.
Data Types: double
Output Arguments
s
— SSSS values
complex-valued vector
SSSS values, returned as a 124-by-1 complex-valued vector. These values are created for the
user equipment settings in the ue
structure. For more
information, see Secondary Sidelink Synchronization Signal.
More About
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.
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.
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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