Peer-to-peer communication in Wi-Fi networks in presence of interference

Patent metadata

Field	Value
Publication number	US-12501469-B2
Application number	US-202318361601-A
Country	US
Kind code	B2
Filing date	Jul 28, 2023
Priority date	May 11, 2023
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

Disclosed are a system and method for avoiding interference in direct communication between peers in a Wi-Fi network. A station (STA) desiring to communicate directly with another STA reports a change in interference to a function that determines a set of unsafe frequencies caused by interference near the STA. The function sends a report containing the set of unsafe frequencies to the AP for the STA. The AP then evaluates the severity of the interference and selects a set of RUs that are suitable for a TXOP for direct communication between the STA and another STA. The AP informs the STAs of the selected set of RUs, and the STAs communicate with each other using the selected RUs. If allowed, the STA sends feedback regarding the success of the communication to the AP.

First claim

We claim:

1 . A method for managing interference in a Wi-Fi network, the method comprising:
evaluating at an access point a severity of detected interference based on a report by at least one station regarding detected interference on a channel of the Wi-Fi network; and determining, based on the severity of the detected interference, a set of resource units (RUs) to allocate to a transmission opportunity (TXOP) for peer-to-peer (P2P) communication between a first station and a second station, the set of RUs being those that avoid the detected interference for the allocated TXOP.

2 . The method of claim 1 , further comprising informing the first and second stations of the set of RUs.

3 . The method of claim 1 , further comprising receiving feedback from the first station on success of the allocated TXOP.

4 . The method of claim 3 , further comprising moving the first station and the second station from a first access point to a second access point in response to the feedback.

5 . The method of claim 1 , wherein the detected interference on the channel is caused by a 5G cellular system transmission operating in an unlicensed band.

6 . The method of claim 1 , wherein determining the set of RUs includes determining a set of unsafe frequencies.

7 . The method of claim 6 , wherein the set of unsafe frequencies includes a list of channels in use by the first station or the second station.

8 . The method of claim 6 , wherein the set of unsafe frequencies includes a list of channels not in use by the first station or the second station.

9 . An access point configured to manage interference in a Wi-Fi network, the access point comprising:
a processor; and a memory coupled to the processor and having loaded therein a program designed to:
evaluate a severity of the interference based on a report by at least one station regarding detected interference on a channel of the Wi-Fi network; and
determine, based on the severity of the detected interference, a set of resource units (RUs) to allocate to a transmission opportunity (TXOP) for peer-to-peer (P2P) communication between a first station and a second station, the set of RUs being those that avoid the detected interference for the allocated TXOP.

10 . The access point of claim 9 , wherein the program is further designed to inform the first and second stations of the set of RUs.

11 . The access point of claim 9 , where the program is further designed to receive feedback from the first station on success of the allocated TXOP.

12 . The access point of claim 11 , wherein the program is further to designed to move the first station and the second station from a first access point to a second access point in response to the feedback.

13 . The access point of claim 9 , wherein the detected interference on the channel is caused by a 5G cellular system transmission operating in an unlicensed band.

14 . The access point of claim 9 ,
wherein the program being designed to determine the set of RUs includes being designed to determine a set of unsafe frequencies; and wherein the set of unsafe frequencies includes a list of channels in use by the first station or the second station.

15 . A non-transitory computer-readable medium encoding instructions, which, when executed by a processor of an access point coupled to a wireless medium, cause the access point to:
evaluate at the access point a severity of detected interference based on a report by at least one station regarding detected interference on a channel of a Wi-Fi network; and determine, based on the severity of the detected interference, a set of resource units (RUs) to allocate to a transmission opportunity (TXOP) for peer-to-peer (P2P) communication between a first station and a second station, the set of RUs being those that avoid the detected interference for the allocated TXOP.

16 . The non-transitory computer-readable medium of claim 15 , wherein the instructions further cause the access point to inform the first and second stations of the set of RUs.

17 . The non-transitory computer-readable medium of claim 15 , wherein the instructions further cause the access point to receive feedback from the first station on success of the allocated TXOP.

18 . The non-transitory computer-readable medium of claim 17 , wherein the instructions further cause the access point to move the first station and the second station from a first access point to a second access point in response to the feedback.

19 . The non-transitory computer-readable medium of claim 15 , wherein the detected interference on the channel is caused by a 5G cellular system transmission operating in an unlicensed band.

20 . The non-transitory computer-readable medium of claim 15 ,
wherein causing the access point to determine the set of RUs includes causing the access point to determine a set of unsafe frequencies; and wherein the set of unsafe frequencies includes a list of channels in use by the first station or the second station.

Assignees

• Cisco Tech Inc

Inventors

• Gandhi Indermeet S
• Henry Jerome
• Barton Robert E
• Smith Malcolm M

Classifications

• H04W72/40

  Resource management for direct mode communication, e.g. D2D or sidelink · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W72/541 Primary

  using the level of interference · CPC title