Enhanced channel access mechanism for improving performance in dense wifi environments

• US 10,375,728 B2
• Filed: 05/22/2017
• Issued: 08/06/2019
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Ross, Rony, Ginsburg, Noam
• Primary Examiner(s): Gidado, Rasheed
• Application Number:
  US15/601,355
• Publication Number:
  US 20180042047A1
• Time in Patent Office: 806 Days
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02

Abstract

Disclosed in some examples are methods, devices (e.g., STAs and APs), and machine readable mediums which utilize a Simultaneous Channel Access (SCA) to allow transmissions of a first wireless network to take place while transmissions are already ongoing in a second wireless network (the Principal Channel Access (PCA)). The SCA allows devices which support SCA to transmit frames even when other nearby devices on other networks have already accessed the medium and are engaged in frame transmission.

Claims

1. An apparatus of a station (STA) configured to operate in a wireless local area network (WLAN) comprising a basic service set (BSS), the BSS including at least the STA and an access point (AP), the apparatus comprising:

memory; and

processing circuitry, configured to;

detect a frame from an overlapping WLAN;

determine from the detected frame if simultaneous channel access is allowed;

determine a duration of channel access from the detected frame;

if simultaneous channel access is allowed, adjust transmission parameters including a transmit power level to reduce interference with the overlapping WLAN, the processing circuitry is to adjust the transmission parameters based on signaling previously received from the AP; and

cause the STA to transmit a second frame to the AP during the duration of the detected frame, the second frame transmitted on a same channel as the detected frame,

wherein in response to detection of the frame from the overlapping WLAN indicating that simultaneous channel access is allowed, the processing circuitry is further configured to;

discontinue acquisition of the detected frame; and

start a simultaneous channel access period for restriction of transmit power for the duration,

wherein the processing circuitry is to cause the STA to transmit the second frame to the AP during the simultaneous channel access period.

2. The apparatus of claim 1, wherein the processing circuitry is further configured to determine if a power level of the detected frame is below a predetermined threshold, and

cause the STA to transmit the second frame to the AP during the duration if the power level of the received frame is below the predetermined threshold.

3. The apparatus of claim 1 wherein the processing circuitry is configured to adjust the transmit power level for transmission of the second frame to be below a detection level of the overlapping WLAN.

4. The apparatus of claim 1 wherein the signaling previously received from the AP is a beacon.

5. The apparatus of claim 1, wherein the processing circuitry is configured to refrain from updating a network allocation vector (NAV) of the STA upon detection of the frame from the overlapping WLAN when the detected frame indicates that simultaneous channel access is allowed and when the power level of the detected frame is below a predetermined threshold.

6. The apparatus of claim 1, wherein the processing circuitry is further configured to decode signaling from the AP prior to detection of the frame from the overlapping WLAN, the processing circuitry to adjust the transmission parameters for simultaneous channel access based on the signaling.

7. The apparatus of claim 1 wherein the overlapping WLAN is an overlapping BSS,

wherein simultaneous channel access comprises a spatial reuse, and

wherein the overlapping BSS uses the same channel as the BSS of the STA.

8. The apparatus of claim 1 wherein the memory is configured to store the second frame.

9. The apparatus of claim 1 further comprising transceiver circuitry coupled to a plurality of antennas.

10. A method performed by a station (STA) configured to operate in a wireless local area network (WLAN) comprising a basic service set (BSS), the BSS including at least the STA and an access point (AP), the method comprising:

detecting a frame from an overlapping WLAN, the overlapping WLAN using a same channel as the BSS of the STA;

determining from the detected frame if simultaneous channel access is allowed;

determining a duration of channel access from the detected frame;

if simultaneous channel access is allowed, adjusting transmission parameters including a transmit power level to reduce interference with the overlapping WLAN, wherein adjusting transmission parameters comprises adjusting the transmission parameters based on signaling previously received from the AP; and

configuring the STA to transmit a second frame to the AP during the duration of the detected frame, the second frame transmitted on the same channel as the detected frame,

wherein in response to detection of the frame from the overlapping WLAN indicating that simultaneous channel access is allowed, the method further comprises;

discontinuing acquisition of the detected frame; and

starting a simultaneous channel access period for restriction of transmit power for the duration,

wherein the method comprises transmission of the second frame to the AP during the simultaneous channel access period.

11. The method of claim 10 further comprising:

determining if a power level of the detected frame is below a predetermined threshold; and

causing the STA to transmit the second frame to the AP during the duration if the power level of the received frame is below the predetermined threshold.

12. The method of claim 10 further comprising adjusting the transmit power level for transmission of the second frame to be below a detection level of the overlapping WLAN.

13. The method of claim 10 further comprising refraining from updating a network allocation vector (NAV) of the STA upon detection of the frame from the overlapping WLAN when the detected frame indicates that simultaneous channel access is allowed and when the power level of the detected frame is below a predetermined threshold.

14. A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a station (STA), the STA configured to operate in a wireless local area network (WLAN) comprising a basic service set (BSS), the BSS including at least the STA and an access point (AP), the processing circuitry configured to:

detect a frame from an overlapping WLAN;

determine from the detected frame if simultaneous channel access is allowed;

determine a duration of channel access from the detected frame;

if simultaneous channel access is allowed, adjust transmission parameters including a transmit power level to reduce interference with the overlapping WLAN, the processing circuitry to adjust the transmission parameters based on signaling previously received from the AP; and

cause the STA to transmit a second frame to the AP during the duration of the detected frame, the second frame transmitted on a same channel as the detected frame,

wherein in response to detection of the frame from the overlapping WLAN indicating that simultaneous channel access is allowed, the processing circuitry is further configured to;

discontinue acquisition of the detected frame; and

start a simultaneous channel access period for restriction of transmit power for the duration,

wherein the processing circuitry is to cause the STA to transmit the second frame to the AP during the simultaneous channel access period.

15. The computer-readable storage medium of claim 14,

wherein the processing circuitry is further configured to determine if a power level of the detected frame is below a predetermined threshold, and

cause the STA to transmit the second frame to the AP during the duration if the power level of the received frame is below the predetermined threshold.

16. The computer-readable storage medium of claim 14 wherein the transmit power level for transmission of the second frame is adjusted to be below a detection level of the overlapping WLAN.

17. The computer-readable storage medium of claim 14, wherein the processing circuitry is configured to refrain from updating a network allocation vector (NAV) of the STA upon detection of the frame from the overlapping WLAN when the detected frame indicates that simultaneous channel access is allowed and when the power level of the detected frame is below a predetermined threshold.