METHOD, ACCESS POINT, AND STATION FOR TRANSMITTING CHANNEL STATE INFORMATION

• US 20190326975A1
• Filed: 07/03/2019
• Published: 10/24/2019
• Est. Priority Date: 07/02/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: YU, Jian, YANG, Xun, Gan, Ming, LIN, Meilu, LOC, Peter
• Granted Patent: US 10,790,891 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0073 Special arrangements for feedback channel
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for transmitting channel state information includes: sending a feedback indication message, a high-efficiency long training sequence, and a resource scheduling message, wherein the feedback indication message is used to indicate more than one target STAs that need to feed back channel state information, the high-efficiency long training sequence is used for determining the channel state information by the target STAs, and the first resource scheduling message is used to indicate a communication resource used by the target STAs when the target STAs feed back the channel state information; and receiving the channel state information sent by the target STAs by using the communication resource.

Claims

1. A method for facilitating transmission of channel state information, comprising:

sending, by an apparatus, a null data packet announcement (NDPA) frame, wherein the NDPA frame carries a feedback indication message which indicates two or more target stations (STAs) that need to feed back channel state information;

sending, by the apparatus, a null data packet (NDP), wherein the NDP carries a high-efficiency long training sequence which is to be used by the two or more target STAs for determining channel state information;

sending, by the apparatus, a first trigger frame after sending the NDP, wherein the first trigger frame carries a first resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame feed back channel state information; and

sending, by the apparatus, a second trigger frame after sending the first trigger frame, wherein the second trigger frame carries a second resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the second trigger frame feed back channel state information.

2. The method according to claim 1, the method further comprises:

receiving, by the apparatus, after sending the first trigger frame, channel state information from the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame; and

/or

receiving, by the apparatus, after sending the second trigger frame, channel state information from the one or more target STAs corresponding to the one or more communication resources indicated in the second trigger frame.

3. The method according to claim 1, wherein the second trigger frame is sent in response to channel state information not being received by the apparatus from the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame.

4. The method according to claim 1, wherein there is an inter frame space between the NDP and the first trigger frame;

and/or wherein there is an inter frame space between the NDP and the NDPA.

5. The method according to claim 1, wherein the first trigger frame comprises a type field which indicates that a type of the first trigger frame is a beamforming report poll.

6. The method according to claim 1, wherein the first trigger frame comprises a feedback segment retransmission bitmap field which indicates requested feedback segments.

7. A method for facilitating transmission of channel state information, comprising:

receiving, by a station (STA), a null data packet announcement (NDPA) frame, wherein the NDPA frame carries a feedback indication message which indicates two or more target STAs that need to feed back channel state information;

receiving, by the STA, a null data packet (NDP), wherein the NDP carries a high-efficiency long training sequence which is to be used by the two or more target STAs for determining channel state information;

determining, by the STA, channel state information corresponding to the STA based on the high-efficiency long training sequence;

receiving, by the STA, a first trigger frame after receiving the NDP, wherein the first trigger frame carries a first resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame feed back channel state information; and

receiving, by the STA, a second trigger frame after receiving the first trigger frame, wherein the second trigger frame carries a second resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the second trigger frame feed back channel state information.

8. The method according to claim 7, the method further comprises:

sending, by the STA after receiving the first trigger frame, the channel state information corresponding to the STA on a communication resource indicated by the first resource scheduling message; and

/or

sending, by the STA after receiving the second trigger frame, the channel state information corresponding to the STA on a communication resource indicated by the second resource scheduling message.

9. The method according to claim 7, wherein there is an inter frame space between the NDP and the first trigger frame;

and/or

wherein there is an inter frame space between the NDP and the NDPA.

10. The method according to claim 7, wherein the first trigger frame comprises a type field which indicates that a type of the first trigger frame is a beamforming report poll.

11. The method according to claim 7, wherein first trigger frame comprises a feedback segment retransmission bitmap field which indicates requested feedback segments.

12. An apparatus for communicating channel state information, comprising a processor and a non-transitory memory having instructions stored thereon, wherein the instructions, when executed by the processor, facilitate:

sending a null data packet announcement (NDPA) frame, wherein the NDPA frame carries a feedback indication message which indicates two or more target stations (STAs) that need to feed back channel state information;

sending a null data packet (NDP), wherein the NDP carries a high-efficiency long training sequence which is to be used by the two or more target STAs for determining channel state information;

sending a first trigger frame after sending the NDP, wherein the first trigger frame carries a first resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame feed back channel state information; and

send a second trigger frame after sending the first trigger frame, wherein the second trigger frame carries a second resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the second trigger frame feed back channel state information.

13. The apparatus according to claim 12, wherein the instructions, when executed by the processor, further facilitate:

receiving, after sending the first trigger frame, channel state information from the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame; and

/or

receiving, after sending the second trigger frame, channel state information from the one or more target STAs corresponding to the one or more communication resources indicated in the second trigger frame.

14. The apparatus according to claim 12, wherein sending the second trigger frame is in response to channel state information not being received by the apparatus from the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame.

15. The apparatus according to claim 12, wherein there is an inter frame space between the NDP and the first trigger frame;

and/or

wherein there is an inter frame space between the NDP and the NDPA.

16. The apparatus according to claim 12, wherein the first trigger frame comprises a type field which indicates that a type of the first trigger frame is a beamforming report poll.

17. The apparatus according to claim 12, wherein the first trigger frame comprises a feedback segment retransmission bitmap field which indicates requested feedback segments.

18. A station (STA) for facilitating transmission of channel state information, comprising a processor and a non-transitory memory having instructions stored thereon, wherein the instructions, when executed, facilitate:

receiving a null data packet announcement (NDPA) frame, wherein the NDPA frame carries a feedback indication message which indicates two or more target STAs that need to feed back channel state information;

receiving a null data packet (NDP), wherein the NDP carries a high-efficiency long training sequence which is to be used by the two or more target STAs for determining channel state information;

determining channel state information corresponding to the STA based on the high-efficiency long training sequence;

receiving a first trigger frame after receiving the NDP, wherein the first trigger frame carries a first resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the first trigger frame feed back channel state information; and

receiving a second trigger frame after receiving the first trigger frame, wherein the second trigger frame carries a second resource scheduling message which indicates one or more communication resources to be used by one or more corresponding target STAs of the two or more target STAs when the one or more target STAs corresponding to the one or more communication resources indicated in the second trigger frame feed back channel state information.

19. The STA according to claim 18, wherein the instructions, when executed by the processor, further facilitate:

sending, after receiving the first trigger frame, the channel state information corresponding to the STA on a communication resource indicated by the first resource scheduling message; and

/or

sending, after receiving the second trigger frame, the channel state information corresponding to the STA on a communication resource indicated by the second resource scheduling message.

20. The STA according to claim 18, wherein there is an inter frame space between the NDP and the first trigger frame;

and/or,

wherein there is an inter frame space between the NDP and the NDPA.

21. The STA according to claim 18, wherein the first trigger frame comprises a type field which indicates that a type of the first trigger frame is a beamforming report poll.

22. The STA according to claim 18, wherein the first trigger frame comprises a feedback segment retransmission bitmap field which indicates requested feedback segments.