COT indication information sending method and apparatus

Patent metadata

Field	Value
Publication number	US-12317320-B2
Application number	US-202117496062-A
Country	US
Kind code	B2
Filing date	Oct 7, 2021
Priority date	Apr 8, 2019
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

When a channel is not occupied within a first COT, a network device sends indication information to a terminal device within the first COT, where the indication information is used to indicate that the channel is not occupied within the first COT. When the channel is occupied within the first COT, the network device obtains a second COT within the first COT, and sends start information of the second COT to the terminal device. Correspondingly, when receiving the indication information, the terminal device may perform blind PDCCH detection in a first manner. If the terminal device does not receive the indication information, it indicates that the channel is occupied within the first COT, and the terminal device performs blind detection on the start information of the second COT.

First claim

What is claimed is:

1. A method, comprising:
in response to determining that a channel is not occupied within a first channel occupancy time (COT), sending, by a network device, indication information to a terminal device within the first COT, wherein the indication information indicates that the channel is not occupied within the first COT, the indication information comprises an identifier identifying the first COT, and the indication information is scrambled using a first scrambling code associated with indication information of one or more COTs; and
in response to determining that the channel is occupied within the first COT, obtaining, by the network device, a second COT within the first COT, and sending start information of the second COT to the terminal device, wherein the start information of the second COT carries an identifier identifying the second COT, and the start information of the second COT is scrambled using a second scrambling code associated with start information of one or more COTs, and wherein the indication information is determined to be indication information based on the first scrambling code being used to scramble the indication information, and the start information of the second COT is determined to be start information based on the second scrambling code being used to scramble the start information of the second COT.

2. The method according to claim 1 , wherein sending, by the network device, the indication information to the terminal device within the first COT comprises:
sending, by the network device, the indication information within first N downlink symbols after uplink symbols and downlink symbols within the first COT are switched, wherein N is a positive integer.

3. The method according to claim 1 , wherein sending, by the network device, the indication information to the terminal device within the first COT comprises:
periodically sending, by the network device, the indication information on downlink symbols within the first COT, wherein a period length of sending the indication information is M symbols, and M is a positive integer.

4. The method according to claim 1 , wherein the indication information comprises:
a demodulation reference signal (DMRS) and control information of a control channel carrying the DMRS.

5. The method according to claim 1 , further comprising:
sending, by the network device, start information of the first COT.

6. A method, comprising:
in response to receiving, by a terminal device, indication information, determining that a channel is not occupied within a first channel occupancy time (COT), wherein the indication information indicates that the channel is not occupied within the first COT, wherein the indication information comprises an identifier identifying the first COT, and the indication information is scrambled using a first scrambling code associated with indication information of one or more COTs; and
in response to the terminal device not receiving the indication information before receiving start information of a second COT that is sent by a network device, determining, by the terminal device, to perform blind detection using the start information of the second COT, and wherein the start information of the second COT carries an identifier identifying the second COT, and the start information of the second COT is scrambled using a second scrambling code associated with start information of one or more COTs, and wherein the indication information is determined to be indication information based on the first scrambling code being used to scramble the indication information, and the start information of the second COT is determined to be start information based on the second scrambling code being used to scramble the start information of the second COT.

7. The method according to claim 6 , wherein receiving, by the terminal device, the indication information comprises:
receiving, by the terminal device, the indication information within first N downlink symbols after uplink symbols and downlink symbols within the first COT are switched, wherein N is a positive integer.

8. The method according to claim 6 , wherein receiving, by the terminal device, the indication information comprises:
periodically receiving, by the terminal device, the indication information on downlink symbols within the first COT, wherein a period length of receiving the indication information is M symbols, and M is a positive integer.

9. The method according to claim 6 , wherein the indication information comprises:
a demodulation reference signal (DMRS) and control information of a control channel carrying the DMRS.

10. The method according to claim 6 , wherein:
when the terminal device receives the indication information, the terminal device performs blind physical downlink control channel (PDCCH) detection in a first manner; and
when the terminal device does not receive the indication information, the terminal device performs blind PDCCH detection in a second manner; and
wherein within a unit time, location points at which the terminal device performs blind PDCCH detection in the second manner are more than location points at which the terminal device performs blind PDCCH detection in the first manner.

11. The method according to claim 6 , further comprising:
receiving, by the terminal device, start information of the first COT.

12. An apparatus, comprising:
one or more processors; and
a non-transitory memory, configured to store instructions; and
wherein the one or more processors are configured to execute the instructions stored in the memory, causing the apparatus to perform the following:
in response to determining that a channel is not occupied within a first channel occupancy time (COT), send indication information to a terminal device within the first COT, wherein the indication information indicates that the channel is not occupied within the first COT, the indication information comprises an identifier identifying the first COT, and the indication information is scrambled using a first scrambling code associated with indication information of one or more COTs; and
in response to determining that the channel is occupied within the first COT, obtain a second COT within the first COT, and send start information of the second COT to the terminal device, wherein the start information of the second COT carries an identifier identifying the second COT, and the start information of the second COT is scrambled using a second scrambling code associated with start information of one or more COTs, and wherein the indication information is determinable to be indication information based on the first scrambling code being used to scramble the indication information, and the start information of the second COT is determinable to be start information based on the second scrambling code being used to scramble the start information of the second COT.

13. The apparatus according to claim 12 , wherein sending the indication information to the terminal device within the first COT comprises:
sending the indication information within first N downlink symbols after uplink symbols and downlink symbols within the first COT are switched, wherein N is a positive integer.

14. The apparatus according to claim 12 , wherein sending the indication information to the terminal device within the first COT comprises:
periodically sending the indication information on downlink symbols within the first COT, wherein a period length of sending the indication information is M symbols, and M is a positive integer.

15. The apparatus according to claim 12 , wherein the indication in

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Junwei
• Yang Fan

Classifications

• H04W74/0866

  using a dedicated channel for access · CPC title

• H04W74/006 Primary

  in the downlink, i.e. towards the terminal · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04L1/0038

  Blind format detection (for detection of modulation format H04L27/0012) · CPC title

• H04L1/0072

  Error control for data other than payload data, e.g. control data · CPC title