SYNCHRONIZATION METHOD AND APPARATUS

• US 20200137703A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 06/30/2017
• Status: Abandoned Application

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: LIU, Zhe, TANG, Hao, WANG, Fan, ZHOU, Guohua
• Application Number:
  US16/726,013
• Publication Number:
  US 20200137703A1
• Time in Patent Office: Days
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/0035 detecting errors in frequency or phase
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

This application provides a synchronization method including: sending, by a terminal, a first uplink signal to a network device on a supplementary uplink resource; and receiving indication information returned by the network device, to implement frequency synchronization with the supplementary uplink resource based on a frequency offset value indicated by the indication information. In one embodiment, the terminal in this application implements the frequency synchronization with the supplementary uplink resource based on the indication information sent by the network device, and does not totally rely on a synchronization signal received on a downlink resource.

Claims

1. A synchronization method, comprising:

sending, by a terminal, a first uplink signal to a network device on a supplementary uplink resource;

receiving, by the terminal, indication information from the network device, wherein the indication information indicates a frequency offset value of the supplementary uplink resource; and

determining, by the terminal, the frequency offset value of the supplementary uplink resource based on the indication information, wherein the frequency offset value is used for the terminal to implement a frequency synchronization with the supplementary uplink resource.

2. The method according to claim 1, wherein the first uplink signal is a random access signal;

and the receiving, by the terminal, indication information from the network device comprises;

receiving, by the terminal, a random access response (RAR) from the network device, wherein the RAR comprises the indication information.

3. The method according to claim 1, wherein the first uplink signal is an uplink reference signal;

and the receiving, by the terminal, indication information from the network device comprises;

receiving, by the terminal, downlink control information from the network device, wherein the downlink control information comprises the indication information.

4. The method according to claim 1, wherein the indication information includes a frequency offset indicator value;

and the determining, by the terminal, the frequency offset value of the supplementary uplink resource based on the indication information comprises;

obtaining, by the terminal, a frequency offset precision; and

determining, by the terminal, the frequency offset value of the supplementary uplink resource based on the frequency offset precision and the frequency offset indicator value.

5. The method according to claim 1, wherein the indication information includes a frequency offset index value;

and the determining, by the terminal, the frequency offset value of the supplementary uplink resource based on the indication information comprises;

selecting, by the terminal from a plurality of preset frequency offset values, a frequency offset value corresponding to the frequency offset index value as the frequency offset value of the supplementary uplink resource.

6. The method according to claim 1, wherein after the determining, by the terminal, the frequency offset value of the supplementary uplink resource based on the indication information, the method further comprises:

performing, by the terminal, a frequency adjustment on the supplementary uplink resource by using the frequency offset value, and sending a second uplink signal on the adjusted supplementary uplink resource;

or

performing, by the terminal, a frequency domain precompensation on a second uplink signal by using the frequency offset value, and sending a frequency domain signal on the supplementary uplink resource.

7. The method according to claim 1, wherein the supplementary uplink resource belongs to a licensed spectrum of a long term evolution (LTE) system.

8. An apparatus, comprising:

a memory having instructions and at least one processor;

wherein the instructions are executed by the at least one processor to cause the apparatus to;

send a first uplink signal to a network device on a supplementary uplink resource;

receive indication information from the network device, wherein the indication information indicates a frequency offset value of the supplementary uplink resource; and

determine the frequency offset value of the supplementary uplink resource based on the indication information, wherein the frequency offset value is used for the terminal to implement a frequency synchronization with the supplementary uplink resource.

9. The apparatus according to claim 8, wherein the first uplink signal is a random access signal;

and wherein the instructions further cause the apparatus to receive a random access response (RAR) from the network device, wherein the RAR comprises the indication information.

10. The apparatus according to claim 8, wherein the first uplink signal is an uplink reference signal;

and wherein the instructions further cause the apparatus to receive downlink control information from the network device, wherein the downlink control information comprises the indication information.

11. The apparatus according to claim 8, wherein the indication information is a frequency offset indicator value;

and wherein the instructions further cause the apparatus to obtain a frequency offset precision and determine the frequency offset value of the supplementary uplink resource based on the frequency offset precision and the frequency offset indicator value.

12. The apparatus according to claim 8, wherein the indication information is a frequency offset index value;

and wherein the instructions further cause the apparatus to select, from a plurality of preset frequency offset values, a frequency offset value corresponding to the frequency offset index value as the frequency offset value of the supplementary uplink resource.

13. The apparatus according to claim 8, wherein the instructions further cause the apparatus to:

perform a frequency adjustment on the supplementary uplink resource by using the frequency offset value, and send a second uplink signal on the adjusted supplementary uplink resource;

or

perform a frequency domain precompensation on a second uplink signal by using the frequency offset value, and send a frequency domain signal on the supplementary uplink resource.

14. The apparatus according to claim 8, wherein the supplementary uplink resource belongs to a licensed spectrum of a long term evolution LTE system.

15. An apparatus, comprising a memory having instructions and at least one processor;

wherein the instructions are executed by the at least one processor to cause the apparatus to;

receive a first uplink signal from a terminal on a supplementary uplink resource;

generate indication information based on the first uplink signal; and

send the indication information to the terminal, wherein the indication information is used to indicate a frequency offset value of the supplementary uplink resource.

16. The apparatus according to claim 15, wherein the first uplink signal is a random access signal;

and wherein the instructions cause the apparatus to send a random access response (RAR) to the terminal, wherein the RAR comprises the indication information.

17. The apparatus according to claim 16, wherein the first uplink signal is an uplink reference signal;

and wherein the instructions cause the apparatus to send downlink control information to the terminal, wherein the downlink control information comprises the indication information.

18. The apparatus according to claim 15, wherein the indication information is a frequency offset indicator value or a frequency offset index value.

19. The apparatus according to claim 16, wherein the supplementary uplink resource belongs to a licensed spectrum of a long term evolution (LTE) system.