METHODS AND APPARATUS FOR CHANNEL STATE INFORMATION FEEDBACK

• US 20160142122A1
• Filed: 12/18/2015
• Published: 05/19/2016
• Est. Priority Date: 10/17/2013
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Merlin, Simone, Barriac, Gwendolyn Denise, Sampath, Hemanth, Vermani, Sameer
• Application Number:
  US14/975,681
• Publication Number:
  US 20160142122A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• 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 1/0027 Scheduling of signalling, e.g. occurrence thereof

Abstract

Methods and apparatus for channel state information feedback are provided. In one aspect, a method for wireless communication is provided. The method includes providing a request from an access point to two or more stations for the two or more stations to transmit channel state information (CSI) concurrently at a specific time. The method further includes receiving, at the access point, the CSI from each of the two or more stations.

Claims

1. An apparatus for wireless communication comprising:

a processing system configured to generate a request for two or more stations to transmit channel state information (CSI) concurrently at a specific time; and

an interface configured to;

provide the request for transmission to the two or more stations; and

receive the channel state information from each of the stations.

2. The apparatus of claim 1, wherein providing the request comprises:

providing a physical layer data unit (PPDU) for transmission to the two or more stations, the PPDU indicating a transmission of a null data packet (NDP) and requesting the two or more stations to transmit channel state information (CSI) concurrently at a specific time after the two or more stations receive the transmission of the NDP; and

providing the NDP, the NDP providing channel estimation signaling.

3. The apparatus of claim 2, wherein the PPDU comprises a null data packet announcement (NDPA) PPDU, wherein the NDP comprises an indication of a type of uplink transmission for the transmission of the CSI by the two or more stations.

4. The apparatus of claim 3, wherein the type of uplink transmission comprises a multiple-user multiple-input multiple output (MU-MIMO) transmission, a multiple-user frequency division multiple access (MU-FDMA) transmission, multiple-user orthogonal frequency division multiple access (MU-OFDMA), a single transmission from one station, or a combination of any of the above.

5. The apparatus of claim 1, wherein the request comprises a physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a physical (PHY) header portion of the PPDU.

6. The apparatus of claim 5, wherein the indication is located within a signal field of the PHY header portion.

7. The apparatus of claim 1, wherein the request comprises a physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a medium access control (MAC) payload portion of the PPDU.

8. The apparatus of claim 1, wherein the request comprises a null data packet announcement (NDPA) physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a medium access control (MAC) payload portion of the PPDU, wherein the NDPA PPDU is located within an aggregated MAC protocol data unit (A-MPDU).

9. The apparatus of claim 1, wherein the request comprises a physical layer data unit (PPDU) comprising a physical (PHY) header portion and a medium access control (MAC) payload portion, wherein the PHY header portion indicates a type of uplink transmission for the CSI, wherein the MAC payload portion indicates which stations should compute and transmit CSI in response to the request.

10. The apparatus of claim 9, wherein the type of uplink transmission comprises a multiple-user multiple-input multiple output (MU-MIMO) transmission, a multiple-user frequency division multiple access (MU-FDMA) transmission, multiple-user orthogonal frequency division multiple access (MU-OFDMA), a single transmission from one station, or a combination of any of the above.

11. The apparatus of claim 1, where the interface is further configured to:

provide a frame requesting at least one of the two or more stations to transmit CSI at a second specific time; and

receive the channel state information from each of the one or more stations.

12. A method for wireless communication, comprising:

providing a request from an access point to two or more stations for the two or more stations to transmit channel state information (CSI) concurrently at a specific time; and

receiving, at the access point, the CSI from each of the two or more stations.

13. The method of claim 12, wherein providing the request comprises:

providing a physical layer data unit (PPDU) for transmission to the two or more stations, the PPDU indicating a transmission of a null data packet (NDP) and requesting the two or more stations to transmit channel state information (CSI) concurrently at a specific time after the two or more stations receive the transmission of the NDP; and

providing the NDP, the NDP providing channel estimation signaling.

14. The method of claim 13, wherein the PPDU comprises a null data packet announcement (NDPA) PPDU, wherein the NDP comprises an indication of a type of uplink transmission for the transmission of the CSI by the two or more stations.

15. The method of claim 12, wherein the request comprises a physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a physical (PHY) header portion of the PPDU.

16. The method of claim 15, wherein the indication is located within a signal field of the PHY header portion.

17. The method of claim 12, wherein the request comprises a physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a medium access control (MAC) payload portion of the PPDU.

18. The method of claim 12, wherein the request comprises a null data packet announcement (NDPA) physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a medium access control (MAC) payload portion of the PPDU, wherein the NDPA PPDU is located within an aggregated MAC protocol data unit (A-MPDU).

19. The method of claim 12, wherein the request comprises a physical layer data unit (PPDU) comprising a physical (PHY) header portion and a medium access control (MAC) payload portion, wherein the PHY header portion indicates a type of uplink transmission for the CSI, wherein the MAC payload portion indicates which stations should compute and transmit CSI in response to the request.

20. The method of claim 19, wherein the type of uplink transmission comprises a multiple-user multiple-input multiple output (MU-MIMO) transmission, a multiple-user frequency division multiple access (MU-FDMA) transmission, multiple-user orthogonal frequency division multiple access (MU-OFDMA), a single transmission from one station, or a combination of any of the above.

21. The method of claim 12, further comprising:

providing a frame requesting at least one of the two or more stations to transmit CSI at a second specific time; and

receiving the channel state information from each of the one or more stations.

22. An apparatus for wireless communication comprising:

means for providing a request from an access point to two or more stations for the two or more stations to transmit channel state information (CSI) concurrently at a specific time; and

means for receiving at the access point the CSI from each of the two or more stations.

23. The apparatus of claim 22, wherein means for providing the request further comprises:

means for providing a physical layer data unit (PPDU) for transmission to the two or more stations, the PPDU indicating a transmission of a null data packet (NDP) and requesting the two or more stations to transmit channel state information (CSI) concurrently at a specific time after the two or more stations receive the transmission of the NDP; and

means for providing the NDP, the NDP providing channel estimation signaling.

24. The apparatus of claim 23, wherein the PPDU comprises a null data packet announcement (NDPA) PPDU, wherein the NDP comprises an indication of a type of uplink transmission for the transmission of the CSI by the two or more stations.

25. The apparatus of claim 22, wherein the request comprises a physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a physical (PHY) header portion of the PPDU.

26. The apparatus of claim 25, wherein the indication is located within a signal field of the PHY header portion.

27. The apparatus of claim 22, wherein the request comprises a physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a medium access control (MAC) payload portion of the PPDU.

28. The apparatus of claim 22, wherein the request comprises a null data packet announcement (NDPA) physical layer data unit (PPDU) comprising an indication of which stations should compute and transmit CSI in response to the request, the indication located in a medium access control (MAC) payload portion of the PPDU, wherein the NDPA PPDU is located within an aggregated MAC protocol data unit (A-MPDU).

29. The apparatus of claim 22, wherein the request comprises a physical layer data unit (PPDU) comprising a physical (PHY) header portion and a medium access control (MAC) payload portion, wherein the PHY header portion indicates a type of uplink transmission for the CSI, wherein the MAC payload portion indicates which stations should compute and transmit CSI in response to the request.

30. A non-transitory computer readable medium comprising instructions that when executed cause a processor to perform a method of:

providing a request from an access point to two or more stations for the two or more stations to transmit channel state information (CSI) concurrently at a specific time; and

receiving at the access point the CSI from each of the two or more stations.