10.2.7 Synchronization signals
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
There are 504 unique physical-layer cell identities indicated by the narrowband secondary synchronization signal.
10.2.7.1 Narrowband primary synchronization signal (NPSS)
10.2.7.1.1 Sequence generation
The sequence 
used for the narrowband primary synchronization signal is generated from a frequency-domain Zadoff-Chu sequence according to
where the Zadoff-Chu root sequence index 
and 
for different symbol indices 
is given by Table 10.2.7.1.1-1.
Table 10.2.7.1.1-1: Definition of 
.
|
Cyclic prefix length |
|
||||||||||
|
Normal |
1 |
1 |
1 |
1 |
-1 |
-1 |
1 |
1 |
1 |
-1 |
1 |
10.2.7.1.2 Mapping to resource elements
The same antenna port shall be used for all symbols of the narrowband primary synchronization signal within a subframe.
UE shall not assume that the narrowband primary synchronization signal is transmitted on the same antenna port as any of the downlink reference signals. The UE shall not assume that the transmissions of the narrowband primary synchronization signal in a given subframe use the same antenna port, or ports, as the narrowband primary synchronization signal in any other subframe.
The sequences 
shall be mapped to resource elements 
in increasing order of first the index 
and then the index 
in subframe 5 in every radio frame. For resource elements 
overlapping with resource elements where cell-specific reference signals according to clause 6.10 are transmitted, the corresponding sequence element 
is not used for the NPSS but counted in the mapping process.
10.2.7.2 Narrowband secondary synchronization signal (NSSS)
10.2.7.2.1 Sequence generation
The sequence 
used for the narrowband secondary synchronization signal is generated from a frequency-domain Zadoff-Chu sequence according to
where
The binary sequence 
is given by Table 10.2.7.2.1-1. The cyclic shift 
in frame number 
is given by
.
Table 10.2.7.2.1-1: Definition of 
.
|
|
|
|
0 |
[1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1] |
|
1 |
[1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1] |
|
2 |
[1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1] |
|
3 |
[1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 1 -1 -1 1 -1 1 1 -1] |
10.2.7.2.2 Mapping to resource elements
The same antenna port shall be used for all symbols of the narrowband secondary synchronization signal within a subframe.
The UE shall not assume that the narrowband secondary synchronization signal is transmitted on the same antenna port as any of the downlink reference signals. The UE shall not assume that the transmissions of the narrowband secondary synchronization signal in a given subframe use the same antenna port, or ports, as the narrowband secondary synchronization signal in any other subframe.
If indicated by higher layer, a UE may assume different precoders are applied for NSSS transmission in a number of consecutive NSSS occasions signalled by higher layer.
The sequence 
shall be mapped to resource elements 
in sequence starting with 
in increasing order of first the index 
over the 12 assigned subcarriers and then the index
over the assigned last 
symbols of subframe 9 for frame structure type 1 or subframe 0 for frame structure type 2 in radio frames fulfilling 
, where 
is given by Table 10.2.7.2.2-1.
Table 10.2.7.2.2-1: NSSS number of symbols
|
Cyclic prefix length |
|
|
Normal |
11 |
For resource elements 
overlapping with resource elements where cell-specific reference signals according to clause 6.10 are transmitted, the corresponding sequence element 
is not used for the NSSS but counted in the mapping process.