Method and apparatus for synchronization signal design
A method of a base station (BS) for transmitting synchronization signals in a wireless communication system. The method comprises generating a primary synchronization signal (PSS) including one of multiple PSS sequences that is generated based on a M-sequence of length 127 in a frequency domain, wherein the PSS indicates part of cell identification (ID) information using a cyclic shift performed on the M-sequence generating the PSS; generating a secondary synchronization signal (SSS) including one of multiple SSS sequences that is generated based on multiple BPSK modulated M-sequences of length 127 in the frequency domain, wherein the SSS indicates the cell ID information using cyclic shifts performed on the M-sequences generating the SSS; and transmitting, to a user equipment (UE), the PSS and SSS over downlink channels.
1. A base station (BS) for identifying synchronization signals (SSs) in a communication system, the BS comprising:
a controller configured to:
identify a primary synchronization signal (PSS), wherein a sequence of the PSS corresponds to second information, a length of the sequence of the PSS is 127, and the sequence of the PSS is mapped to subcarriers in a first orthogonal frequency division multiplexing (OFDM) symbol within one SS block,
identify a secondary synchronization signal (SSS), wherein a sequence of the SSS is defined based on a second sequence and a third sequence, the sequence of the SSS corresponds to first information and the second information, a length of the sequence of the SSS is 127, and the sequence of the SSS is mapped to subcarriers in a second OFDM symbol within the one SS block, and
identify a physical broadcast channel (PBCH) including a master information block in at least third OFDM symbol within the one SS block; and
a transceiver coupled to the controller, the transceiver configured to transmit the one SS blocks,
wherein the first OFDM symbol is time division multiplexed (TDMed) with the second OFDM symbol and the at least third OFDM symbol within the one SS block,
wherein the first OFDM symbol is located prior to the second OFDM symbol and the at least third OFDM sysmbol; and
wherein a physical layer cell identifier (ID) is defined based on the first information and the second information.
2. The base station of claim 1 , wherein the sequence of the PSS is a cyclic shifted sequence of a first sequence, corresponding to one of a plurality of second information.
3. The base station of claim 2 , wherein the sequence of the PSS is associated with consecutive 127 values within the cyclic shifted sequence of the first sequence.
4. The base station of claim 1 , wherein the subcarriers in the first OFDM symbol are central 127 subcarriers within resource blocks for the PSS, and
wherein the central 127 subcarriers include a direct current (DC) subcarrier.
5. The base station of claim 1 , wherein the subcarriers in the second OFDM symbol are the same as the subcarriers in the first OFDM symbol.
6. A method of a base station for identifying synchronization signals (SSs) in a communication system, the method comprising:
identifying a primary synchronization signal (PSS), wherein a sequence of the PSS corresponds to second information, a length of the sequence of the PSS is 127, and the sequence of the PSS is mapped to subcarriers in a first orthogonal frequency division multiplexing (OFDM) symbol within one SS block;
identifying a secondary synchronization signal (SSS), wherein a sequence of the SSS is defined based on a second sequence and a third sequence, the sequence of the SSS corresponds to first information and the second information, a length of the sequence of the SSS is 127, and the sequence of the SSS is mapped to subcarriers in a second OFDM symbol within the one SS block;
identifying a physical broadcast channel (PBCH) including a master information block in at least third OFDM symbol within the one SS block; and
transmitting the one SS block,
wherein the first OFDM symbol is time division multiplexed (TDMed) with the second OFDM symbol and the at least third OFDM symbol within the one SS block,
wherein the first OFDM symbol is located prior to the second OFDM symbol ant the at least third OFDM symbol, and
wherein a physical layer cell identifier (ID) is defined based on the first information and the second information.
7. The method of claim 6 , wherein the sequence of the PSS is a cyclic shifted sequence of a first sequence, corresponding to one of a plurality of second information.
8. The method of claim 7 , wherein the sequence of the PSS is associated with consecutive 127 values within the cyclic shifted sequence of the first sequence.
9. The method of claim 6 , wherein the subcarriers in the first OFDM symbol are central 127 subcarriers within resource blocks for the PSS, and
wherein the central 127 subcarriers include a direct current (DC) subcarrier.
10. The method of claim 6 , wherein the subcarriers in the second OFDM symbol are the same as the subcarriers in the first OFDM symbol.
11. A terminal for identifying synchronization signals (SSs) in a communication system, the terminal comprising:
a transceiver configured to receive one SS block; and
a controller coupled with the transceiver and configured to:
identify a primary synchronization signal (PSS), wherein a sequence of the PSS corresponds to second information, a length of the sequence of the PSS is 127, and the sequence of the PSS is mapped to subcarriers in a first orthogonal frequency division multiplexing (OFDM) symbol within the one SS block,
identify a secondary synchronization signal (SSS), wherein a sequence of the SSS is defined based on a second sequence and a third sequence, the sequence of the SSS corresponds to first information and the second information, a length of the sequence of the SSS is 127, and the sequence of the SSS is mapped to subcarriers in a second OFDM symbol within the one SS block, and
identify a physical broadcast channel (PBCH) including a master information block in at least third OFDM symbol within the one SS block,
wherein the first OFDM symbol is time division multiplexed (TDMed) with the second OFDM symbol and the at least third OFDM symbol within the one SS block,
wherein the first OFDM symbol is located prior to the second OFDM symbol and the at least third OFDM symbol, and
wherein a physical layer cell identifier (ID) is defined based on the first information and the second information.
12. The terminal of claim 11 , wherein the sequence of the PSS is a cyclic shifted sequence of a first sequence, corresponding to one of a plurality of second information.
13. The terminal of claim 12 , wherein the sequence of the PSS is associated with consecutive 127 values within the cyclic shifted sequence of the first sequence.
14. The terminal of claim 11 , wherein the subcarriers in the first OFDM symbol are central 127 subcarriers within resource blocks for the PSS, and
wherein the central 127 subcarriers include a direct current (DC) subcarrier.
15. The terminal of claim 11 , wherein the subcarriers in the second OFDM symbol are the same as the subcarriers in the first OFDM symbol.
16. A method of a user equipment for identifying synchronization signals (SSs) in a communication system, the method comprising:
receiving one SS block;
identifying a primary synchronization signal (PSS), wherein a sequence of the PSS corresponds to second information, a length of the sequence of the PSS is 127, and the sequence of the PSS is mapped to subcarriers in a first orthogonal frequency division multiplexing (OFDM) symbol within the one SS block;
identifying a secondary synchronization signal (SSS), wherein a sequence of the SSS is defined based on a second sequence and a third sequence, the sequence of the SSS corresponds to first information and the second information, a length of the sequence of the SSS is 127, and the sequence of the SSS is mapped to subcarriers in a second OFDM symbol within the one SS block; and
identifying a physical broadcast channel (PBCH) including a master information block in at least third OFDM symbol within the one SS block,
wherein the first OFDM symbol is time division multiplexed (TDMed) with the second OFDM symbol and the at least third OFDM symbol within the one SS block,
wherein the first OFDM symbol is located prior to the second OFDM symbol and the at least third OFDM symbol, and
wherein a physical layer cell identifier (ID) is defined based on the first information and the second information.
17. The method of claim 16 , wherein the sequence of the PSS is a cyclic shifted sequence of a first sequence, corresponding to one of a plurality of second information.
18. The method of claim 17 , wherein the sequence of the PSS is associated with consecutive 127 values within the cyclic shifted sequence of the first sequence.
19. The method of claim 16 , wherein the subcarriers in the first OFDM symbol are central 127 subcarriers within resource blocks for the PSS, and
wherein the central 127 subcarriers include a direct current (DC) subcarrier.
20. The method of claim 16 , wherein the subcarriers in the second OFDM symbol are same as the subcarriers in the first OFDM symbol.