SYSTEM AND METHOD FOR BACKHAUL BASED SOUNDING FEEDBACK
First Claim
1. A method implemented in an access point (AP) configured to exchange messages with at least one associated station (STA) via a wireless channel, the AP comprising:
- a plurality of antennas, radio circuitry configured to transmit and receive via said antennas, and a baseband processor, the method comprising;
establishing a backhaul link with at least one co-channel neighboring AP, sending a sounding packet to said at least one associated STA over the wireless channel, andobtaining channel state information (CSI) feedback from said at least one co-channel neighboring AP via the backhaul link.
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Abstract
A system and method for backhaul based explicit sounding feedback of 802.11 AP to AP channel state information (CSI) so that inter AP interference can be reduced and multiple APs transmissions that can occur simultaneously on the same radio channel. A modification may be made to APs such that they can accurately measure the CSI between them that in turn enables their respective beamformer to create pattern nulls toward each other while simultaneously developing pattern enhancements toward their intended station. An AP may send a sounding packet to its associated STAs, poll explicit feedbacks from STAs and receive backhaul CSI feedbacks from neighboring APs. There is no additional Wi-Fi overhead in physical layer. Backhaul feedback link is established through direct peer-to-peer (P2P) link which bypassed the sounding controller to reduce CSI feedback delay.
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Citations
22 Claims
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1. A method implemented in an access point (AP) configured to exchange messages with at least one associated station (STA) via a wireless channel, the AP comprising:
- a plurality of antennas, radio circuitry configured to transmit and receive via said antennas, and a baseband processor, the method comprising;
establishing a backhaul link with at least one co-channel neighboring AP, sending a sounding packet to said at least one associated STA over the wireless channel, and obtaining channel state information (CSI) feedback from said at least one co-channel neighboring AP via the backhaul link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17)
- a plurality of antennas, radio circuitry configured to transmit and receive via said antennas, and a baseband processor, the method comprising;
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12. An access point (AP) configured to exchange messages with at least one associated station (STA) via a wireless channel, the AP comprising:
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a plurality of antennas, radio circuitry configured to transmit and receive via said antennas, and a baseband processor, wherein the baseband processor is configured to cause the AP to; establish a backhaul link with at least one co-channel neighboring AP, send a sounding packet to said at least one associated STA over the wireless channel, and obtain channel state information (CSI) feedback from said at least one neighboring AP via the backhaul link. - View Dependent Claims (13, 14, 15, 16)
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18. An access point (AP) configured to exchange messages with at least one associated station (STA) via a wireless channel, the AP comprising:
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a plurality of antennas; radio circuitry configured to transmit and receive via said antennas and a baseband processor, wherein the baseband processor is configured to establish a backhaul link with at least one neighboring AP, to detect a sounding packet sent by the neighboring AP to at least one associated STA over the wireless channel, and to send channel state information (CSI) to said at least one neighboring AP via the backhaul link. - View Dependent Claims (19, 20, 21)
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22. A communication system comprising a plurality of access points (APs) each configured to exchange messages with at least one associated station (STA) via a wireless channel, establishing a backhaul link with at least one co-channel neighboring AP, send a sounding packet to said at least one associated STA over the wireless channel, and obtain channel state information (CSI) feedback from said at least one neighboring AP via the backhaul link, the system further comprising a sounding controller for registration of said APs, each AP being configured to register with said sounding controller.
Specification