Synchronization signal block transmission method and apparatus
Embodiments of this application relate to the communication field, and provide a synchronization signal block transmission method and an apparatus. The method includes: A first terminal device generates a sidelink synchronization signal block and sends the sidelink synchronization signal block to a second terminal device, where the sidelink synchronization signal block includes a PSBCH, an SPSS, and an SSSS, where the PSBCH includes M OFDM symbols in time domain, the PSBCH includes a DMRS, the DMRS includes K OFDM symbols of the M OFDM symbols in time domain, and the DMRS is mapped at an interval of n−1 subcarriers in frequency domain; and the SPSS or the SSSS includes 2 OFDM symbols in time domain, and the PSBCH, the SPSS and the SSSS includes N RBs in frequency domain; includes N RBs in frequency domain.
1. A method comprising:
generating, by a first terminal device, a sidelink synchronization signal block; and
sending, by the first terminal device, the sidelink synchronization signal block to a second terminal device, wherein the sidelink synchronization signal block comprises a physical sidelink broadcast channel (PSBCH), a sidelink primary synchronization signal (SPSS), and a sidelink secondary synchronization signal (SSSS), and wherein
the PSBCH comprises M orthogonal frequency division multiplexing (OFDM) symbols in time domain, the PSBCH comprises a demodulation reference signal (DMRS), the DMRS comprises K OFDM symbols of the M OFDM symbols in the time domain, and the DMRS is mapped to frequency domain at an interval of n−1 subcarriers, wherein n is an integer greater than or equal to 1, M is an integer greater than or equal to 6, and K is a positive integer less than or equal to M; and the PSBCH comprises N resource blocks (RBs) in the frequency domain, wherein N is an integer greater than 6; and
the SPSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain; and the SSSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain.
2. The method according to claim 1 , wherein the N is equal to 11.
3. The method according to claim 1 , wherein the M is equal to the K.
4. The method according to claim 1 , wherein the n is equal to 4.
5. The method according to claim 1 , wherein the SSSS is generated by interleaving two M sequences.
6. A method comprising:
receiving, by a second terminal device, a sidelink synchronization signal block from a first terminal device, wherein the sidelink synchronization signal block comprises a physical sidelink broadcast channel (PSBCH), a sidelink primary synchronization signal (SPSS), and a sidelink secondary synchronization signal (SSSS); and
parsing, by the second terminal device, the sidelink synchronization signal block, wherein
the PSBCH comprises M orthogonal frequency division multiplexing (OFDM) symbols in time domain, the PSBCH comprises a demodulation reference signal (DMRS), the DMRS comprises K OFDM symbols of the M OFDM symbols in the time domain, and the DMRS is mapped to frequency domain at an interval of n−1 subcarriers, wherein n is an integer greater than or equal to 1, M is an integer greater than or equal to 6, and K is a positive integer less than or equal to M; and the PSBCH comprises N resource blocks (RBs) in the frequency domain, wherein N is an integer greater than 6; and
the SPSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain; and the SSSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain.
7. The method according to claim 6 , wherein the N is equal to 11.
8. The method according to claim 6 , wherein the M is equal to the K.
9. The method according to claim 6 , wherein the n is equal to 4.
10. The method according to claim 6 , wherein the SSSS is generated by interleaving two M sequences.
11. A wireless apparatus, comprising:
one or more processors; and
a memory storing instructions that, when executed by the one or more processors, cause the apparatus to perform:
generating a sidelink synchronization signal block; and
sending the sidelink synchronization signal block to a second terminal device, wherein the sidelink synchronization signal block comprises a physical sidelink broadcast channel (PSBCH), a sidelink primary synchronization signal (SPSS), and a sidelink secondary synchronization signal (SSSS), and wherein
the PSBCH comprises M orthogonal frequency division multiplexing (OFDM) symbols in time domain, the PSBCH comprises a demodulation reference signal (DMRS), the DMRS comprises K OFDM symbols of the M OFDM symbols in the time domain, and the DMRS is mapped to frequency domain at an interval of n−1 subcarriers, wherein n is an integer greater than or equal to 1, M is an integer greater than or equal to 6, and K is a positive integer less than or equal to M; and the PSBCH comprises N resource blocks (RBs) in the frequency domain, wherein N is an integer greater than 6; and
the SPSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain; and the SSSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain.
12. The apparatus according to claim 11 , wherein the N is equal to 11.
13. The apparatus according to claim 11 , wherein the M is equal to the K.
14. The apparatus according to claim 11 , wherein the n is equal to 4.
15. The apparatus according to claim 11 , wherein the SSSS is generated by interleaving two M sequences.
16. A wireless apparatus, comprising:
one or more processors; and
a memory storing instructions that, when executed by the one or more processors, cause the apparatus to perform:
receiving a sidelink synchronization signal block from a first terminal device, wherein the sidelink synchronization signal block comprises a physical sidelink broadcast channel (PSBCH), a sidelink primary synchronization signal (SPSS), and a sidelink secondary synchronization signal (SSSS); and
parsing the sidelink synchronization signal block, wherein
the PSBCH comprises M orthogonal frequency division multiplexing (OFDM) symbols in time domain, the PSBCH comprises a demodulation reference signal (DMRS), the DMRS comprises K OFDM symbols of the M OFDM symbols in the time domain, and the DMRS is mapped to frequency domain at an interval of n−1 subcarriers, wherein n is an integer greater than or equal to 1, M is an integer greater than or equal to 6, and K is a positive integer less than or equal to M; and the PSBCH comprises N resource blocks (RBs) in the frequency domain, wherein N is an integer greater than 6; and
the SPSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain; and the SSSS comprises 2 OFDM symbols in the time domain and N RBs in the frequency domain.
17. The apparatus according to claim 16 , wherein the N is equal to 11.
18. The apparatus according to claim 16 , wherein the M is equal to the K.
19. The apparatus according to claim 16 , wherein the n is equal to 4.
20. The apparatus according to claim 16 , wherein the SSSS is generated by interleaving two M sequences.