Frame transmission method and apparatus, communication end, and storage medium

Patent metadata

Field	Value
Publication number	US-12238773-B2
Application number	US-201917779544-A
Country	US
Kind code	B2
Filing date	Nov 29, 2019
Priority date	Nov 29, 2019
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A frame transmission method, includes: sending, by a first communication end to a second communication end, a first RTS on an unlicensed channel, wherein the first RTS carries a licensed frequency band source indication; receiving, according to the licensed frequency band source indication, an assist-clear to send (A-CTS) that is sent by the second communication end in a retreat state on the licensed channel; and sending, according to the A-CTS, a first clear-request to send (C-RTS) on the unlicensed channel, wherein the first C-RTS is configured for instructing a third communication end to exit the retreat state entered based on the first RTS.

First claim

What is claimed is:

1. A frame transmission method, comprising:
sending, by a first communication end to a second communication end, a first request to send (RTS) on an unlicensed channel, wherein the first RTS carries a licensed frequency band source indication;
receiving, by the first communication end according to the licensed frequency band source indication, an assist-clear to send (A-CTS) that is sent by the second communication end in a retreat state on a licensed channel; and
sending, by the first communication end according to the A-CTS, a first clear-request to send (C-RTS) on the unlicensed channel, wherein the first C-RTS is configured for instructing a third communication end to exit the retreat state entered based on the first RTS.

2. The method according to claim 1 , wherein sending, according to the A-CTS, the first clear-request to send (C-RTS) on the unlicensed channel comprises:
retreating one short interframe space (SIFS) after receiving the A-CTS; and
sending the first C-RTS on the unlicensed channel after one SIFS is retreated.

3. The method according to claim 1 , further comprising:
sending a second RTS to the second communication end on the unlicensed channel after the retreat state of the second communication end ends according to a remaining retreat duration indication carried by the A-CTS.

4. The method according to claim 3 , wherein sending the second RTS to the second communication end on the unlicensed channel comprises:
sending the second RTS to the second communication end on the unlicensed channel in response to detecting that the unlicensed channel is idle and after one distributed inter-frame spacing (DIFS) is retreated.

5. The method according to claim 1 , further comprising:
receiving, on the unlicensed channel, a first clear to send (CTS) sent by the second communication end based on the first RTS; and
sending a data frame to the second communication end on the unlicensed channel in response to receiving the first CTS after one SIFS is retreated.

6. A frame transmission method, comprising:
receiving, by a second communication end on an unlicensed frequency band, a first request to send (RTS) sent by a first communication end; and
sending, by the second communication end on a licensed frequency band, an assist-clear to send (A-CTS) to a first communication end according to a licensed frequency band source indication carried by the first RTS when the second communication end is in a retreat state, wherein the A-CTS is configured to trigger the first communication end to send a first clear-request to send (C-RTS) on the unlicensed frequency band, and the first C-RTS is configured for instructing a third communication end to exit the retreat state triggered based on the RTS on the unlicensed frequency band.

7. The method according to claim 6 , wherein the A-CTS carries a remaining retreat duration indication, the remaining retreat duration indication indicates a remaining retreat duration of the second communication end being in the retreat state, and the remaining retreat duration indication is configured to allow the first communication end to determine time of sending a second RTS.

8. The method according to claim 6 , further comprising:
sending a second clear to send (CTS) on the unlicensed frequency band when the second communication end is not in the retreat state, wherein the second CTS is configured for instructing a fourth communication end to enter into the retreat state.

9. A frame transmission method, comprising:
entering, by a third communication end, into a retreat state after monitoring a first request to send (RTS) sent by a first communication end on an unlicensed channel; and
exiting, by the third communication end, the retreat state in response to monitoring a first clear-request to send (C-RTS) sent by the first communication end on the unlicensed channel after entering into the retreat state,
wherein the first C-RTS is sent by the first communication end after receiving an A-CTS sent by a second communication end on a licensed channel, and the A-CTS is sent by the second communication end after receiving the first RTS when the second communication end is in a retreat state, based on a licensed frequency band source indication in the first RTS.

10. The method according to claim 9 , further comprising:
in response to determining that the first C-RTS is not monitored on the unlicensed channel, exiting the retreat state after a retreat duration determined based on the first RTS after entering into the retreat state.

11. A communication device, comprising:
a transceiver;
a memory; and
a processor, connected with the transceiver and the memory respectively, for controlling the transceiver to receive and send a wireless signal by executing a computer executable instruction stored on the memory, so as to implement the method provided by claim 1 .

12. A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores a computer executable instruction; and the computer executable instruction, after being executed by a processor, can implement the method provided by claim 1 .

13. The method according to claim 2 , further comprising:
receiving, on the unlicensed channel, a first clear to send (CTS) sent by the second communication end based on the first RTS; and
sending a data frame to the second communication end on the unlicensed channel in response to receiving the first CTS after one SIFS is retreated.

14. The method according to claim 3 , further comprising:
receiving, on the unlicensed channel, a first clear to send (CTS) sent by the second communication end based on the first RTS; and
sending a data frame to the second communication end on the unlicensed channel in response to receiving the first CTS after one SIFS is retreated.

15. The method according to claim 4 , further comprising:
receiving, on the unlicensed channel, a first clear to send (CTS) sent by the second communication end based on the first RTS; and
sending a data frame to the second communication end on the unlicensed channel in response to receiving the first CTS after one SIFS is retreated.

16. The method according to claim 7 , further comprising:
sending a second CTS on the unlicensed frequency band when the second communication end is not in the retreat state, wherein the second clear to send (CTS) is configured for instructing a fourth communication end to enter into the retreat state.

17. A communication device, comprising:
a transceiver;
a memory; and
a processor, connected with the transceiver and the memory respectively, for controlling the transceiver to receive and send a wireless signal by executing a computer executable instruction stored on the memory, so as to implement the method provided by claim 6 .

18. A communication device, comprising:
a transceiver;
a memory; and
a processor, connected with the transceiver and the memory respectively, for controlling the transceiver to receive and send a wireless signal by executing a computer executable instruction stored on the memory, so as to implement the method provided by claim 9 .

19. A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores a computer executable instruction; and the computer executable instruction, after being executed by a processor, can implement the method provided by claim 6 .

20. A non-transitory computer-readable storage medium, wherein the non-transitory co

Assignees

• Beijing Xiaomi Mobile Software Co Ltd
• Univ Beijing Posts & Telecomm

Inventors

• Zhu Yajun
• Hong Wei
• Li Junli
• Li Yong

Classifications

• H04W74/002

  Transmission of channel access control information · CPC title

• H04W74/0816 Primary

  with collision avoidance · CPC title

• H04W74/004

  in the uplink, i.e. towards network · CPC title

• H04W74/006 Primary

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