Synchronization signal transmission method and communications apparatus

Patent metadata

Field	Value
Publication number	US-12256348-B2
Application number	US-202217585159-A
Country	US
Kind code	B2
Filing date	Jan 26, 2022
Priority date	Aug 21, 2019
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

This application provides a synchronization signal transmission method and a communications apparatus. The synchronization signal transmission method and the communications apparatus are applied to the communications field. In the synchronization signal transmission method, a synchronization signal generated and sent by a network device may include a first sequence and a second sequence. The first sequence is a first complex sequence or a sequence obtained based on the first complex sequence. The second sequence is a sequence obtained based on the first complex sequence, and the second sequence is different from the first sequence. Because a correlation processing result between the first sequence and the second sequence is still a complex sequence, there is a good correlation property, so that a terminal device can obtain a relatively sharp correlation peak when synchronizing with the network device based on the synchronization signal, thereby effectively shortening duration required for synchronization.

First claim

What is claimed is:

1. A communication method, applied to a terminal device, wherein the method comprises:
generating a synchronization signal, wherein the synchronization signal comprises a first sequence and a second sequence; and
sending the synchronization signal, wherein:
a first time unit carrying the first sequence is different from a second time unit carrying the second sequence;
the first sequence is a sequence obtained based on a first complex sequence and a first calculation rule, the first calculation rule comprises any one of a point multiplication rule, a conjugate point multiplication rule, and a conjugate point division rule, and the second sequence is a sequence obtained based on the first complex sequence and the first calculation rule; and
the first sequence is different from the second sequence, and a correlation processing result between the first sequence and the second sequence is a complex sequence.

2. The method according to claim 1 , wherein resources occupied by the synchronization signal in time domain comprise a first time unit group and a second time unit group, the first time unit is any time unit in the first time unit group, and the second time unit is any time unit in the second time unit group.

3. The method according to claim 2 , wherein the resources occupied by the synchronization signal in time domain comprise N time units, and N is an integer greater than or equal to 2, the first time unit group consists of time units whose numbers are odd numbers in the N time units, and the second time unit group consists of time units whose numbers are even numbers in the N time units.

4. The method according to claim 2 , wherein the resources occupied by the synchronization signal in time domain comprise N time units;
the first time unit group consists of the first L time units in time domain in the N time units;
the second time unit group consists of the last (N−L) time units in time domain in the N time units; and
N is an integer greater than or equal to 2, and L is └N/2┘ or ┌N/2┐.

5. The method according to claim 1 , wherein:
resources occupied by the synchronization signal in time domain comprise N time units, and the first time unit is located before the second time unit in time domain;
when a number Ml of the first time unit in the N time units is equal to 1, the first sequence is the first complex sequence;
when the number M1 of the first time unit in the N time units is greater than 1, the first sequence is a sequence obtained based on the first calculation rule and M1 first complex sequences; and
the second sequence is a sequence obtained based on the first calculation rule and M2 first complex sequences, M2 is a number of the second time unit in the N time units, and M2 is an integer greater than 1.

6. The method according to claim 1 , wherein the second sequence is obtained by applying the first calculation rule to the first sequence and the first complex sequence, and the second time unit is a time unit adjacent to the first time unit.

7. The method according to claim 1 , wherein:
the first complex sequence is a ZC sequence; or
the first complex sequence is a sequence obtained by performing inverse fast Fourier transformation (IFFT) or fast Fourier transformation (FFT) on the ZC sequence, an m sequence, or a gold sequence.

8. A synchronization signal transmission method, comprising:
receiving a synchronization signal from a network device, wherein the synchronization signal comprises a first sequence and a second sequence; and
synchronizing with the network device based on the synchronization signal, wherein:
a first time unit carrying the first sequence is different from a second time unit carrying the second sequence;
the first sequence is a sequence obtained based on a first complex sequence and a first calculation rule, the first calculation rule comprises any one of a point multiplication rule, a conjugate point multiplication rule, and a conjugate point division rule, and the second sequence is a sequence obtained based on the first complex sequence and the first calculation rule; and
the first sequence is different from the second sequence, and a correlation processing result between the first sequence and the second sequence is a complex sequence.

9. The method according to claim 8 , wherein resources occupied by the synchronization signal in time domain comprise a first time unit group and a second time unit group, the first time unit is any time unit in the first time unit group, and the second time unit is any time unit in the second time unit group.

10. The method according to claim 9 , wherein the resources occupied by the synchronization signal in time domain comprise N time units, and N is an integer greater than or equal to 2;
the first time unit group consists of time units whose numbers are odd numbers in the N time units; and
the second time unit group consists of time units whose numbers are even numbers in the N time units.

11. The method according to claim 9 , wherein the resources occupied by the synchronization signal in time domain comprise N time units;
the first time unit group consists of the first L time units in time domain in the N time units;
the second time unit group consists of the last (N−L) time units in time domain in the N time units; and
N is an integer greater than or equal to 2, and L is └N/2┘ or ┌N/2┐.

12. The method according to claim 8 , wherein resources occupied by the synchronization signal in time domain comprise N time units, and the first time unit is located before the second time unit in time domain;
when a number Ml of the first time unit in the N time units is equal to 1, the first sequence is the first complex sequence; or when the number M1 of the first time unit in the N time units is greater than 1, the first sequence is a sequence obtained based on the first calculation rule and M1 first complex sequences; and
the second sequence is a sequence obtained based on the first calculation rule and M2 first complex sequences, M2 is a number of the second time unit in the N time units, and M2 is an integer greater than 1.

13. The method according to claim 8 , wherein the second sequence is obtained by applying the first calculation rule to the first sequence and the first complex sequence, and the second time unit is a time unit adjacent to the first time unit.

14. The method according to claim 8 , wherein:
the first complex sequence is a ZC sequence; or
the first complex sequence is a sequence obtained by performing inverse fast Fourier transformation (IFFT) or fast Fourier transformation (FFT) on the ZC sequence, an m sequence, or a gold sequence.

15. A communications apparatus, comprising:
at least one processor configured to generate a synchronization signal, wherein the synchronization signal comprises a first sequence and a second sequence; and
a communications unit, configured to send the synchronization signal, wherein:
a first time unit carrying the first sequence is different from a second time unit carrying the second sequence;
the first sequence is a sequence obtained based on a first complex sequence and a first calculation rule, the first calculation rule comprises any one of a point multiplication rule, a conjugate point multiplication rule, and a conjugate point division rule, and the second sequence is a sequence obtained based on the first complex sequence and the first calculation rule; and
the first sequence is different from the second sequence, and a correlation processing result between the first sequence and the second sequence is a complex sequence.

Assignees

• Huawei Tech Co Ltd

Inventors

• Zheng Juan
• Li Chaojun
• Ji Tong

Classifications

• H04J3/0608

  Detectors therefor, e.g. correlators, state machines · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title

• H04L27/2613 Primary

  Structure of the reference signals · CPC title