Method and apparatus for determining access control parameters for devices in a wireless communications network

• US 9,699,741 B1
• Filed: 04/15/2015
• Issued: 07/04/2017
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Chu, Liwen, Sun, Yakun, Wang, Lei, Lou, Hui-Ling, Zhang, Hongyuan
• Primary Examiner(s): Vu, Huy D
• Assistant Examiner(s): Shao, Hong
• Application Number:
  US14/687,442
• Time in Patent Office: 811 Days
• Field of Search: None
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless communication system includes a first access point, and at least one first station in communication with the first access point. The first access point controls access parameters for communications with a first station. The access parameters may include Enhanced Distributed Channel Access parameters such as a minimum or maximum contention window parameter, an arbitration interframe spacing parameter, or a transmit opportunity limit parameter. The access parameters also may include a channel bandwidth parameter, a transmit power parameter, or a data rate parameter such as a modulation and coding scheme parameter. Where the system includes an additional access point, and at least one additional station in communication with the additional access point, the first access point and the additional access point control access parameters to avoid interference between the first access point and the additional access point. A central controller may coordinate between the first and additional access points.

Claims

1. A wireless communication system comprising:

a first wireless access point; and

a first set of at least one first station in wireless communication with the first wireless access point;

an additional wireless access point; and

an additional set of at least one additional station in wireless communication with the additional wireless access point,

wherein the first wireless access point controls access parameters for communications with a first station in the set of at least one first station;

wherein the additional wireless access point controls access parameters for communications with an additional station in the additional set of at least one additional station;

wherein the first wireless access point sets a first transmit power threshold for stations with a first transmit opportunity bandwidth access parameter when the additional wireless access point sets a second transmit power threshold for stations with a second transmit opportunity bandwidth access parameter; and

wherein the first wireless access point sets the second transmit power threshold for stations with the first transmit opportunity bandwidth access parameter when the additional wireless access point sets the first transmit power threshold for stations with the second transmit opportunity bandwidth access parameter.

2. The wireless communication system of claim 1, wherein the first wireless access point controls access parameters for communications with a group or groups of first stations within the first set of at least one first station.

3. The wireless communication system of claim 1, wherein the access parameters include Enhanced Distributed Channel Access parameters.

4. The wireless communication system of claim 3, wherein the Enhanced Distributed Channel Access parameters include one or more of a minimum contention window parameter, a maximum contention window parameter, an arbitration interframe spacing parameter, or a transmit opportunity limit parameter.

5. The wireless communication system of claim 4 wherein:

the Enhanced Distributed Channel Access parameters include a transmit opportunity limit parameter, and

the transmit opportunity limit parameter is selected based on at least one of interference level, clear channel access level, or data rate.

6. The wireless communication system of claim 1, wherein the access parameters include one or more of a channel bandwidth parameter, a transmit power parameter, or a data rate parameter.

7. The wireless communication system of claim 6, wherein the data rate parameter includes a modulation and coding scheme parameter.

8. The wireless communication system of claim 6, wherein the access parameters include a channel bandwidth parameter.

9. The wireless communication system of claim 6, wherein the access parameters include a transmit opportunity bandwidth parameter.

10. The wireless communication system of claim 1,

wherein the first wireless access point and the additional wireless access point control access parameters to avoid interference between the first wireless access point and the additional wireless access point.

11. The wireless communication system of claim 1, wherein:

the first wireless access point sets a channel access parameter for distant stations to a first channel when the additional wireless access point sets the channel access parameter for distant stations to a second channel; and

the first wireless access point sets the channel access parameter for distant stations to the second channel when the additional wireless access point sets the channel access parameter for distant stations to the first channel.

12. The wireless communication system of claim 1, further comprising

a central controller that coordinates between the first wireless access point and the additional wireless access point so that the first wireless access point and the additional wireless access point set access parameters to avoid interference between the first wireless access point and the additional wireless access point.

13. A method of operating a wireless communication system having a first wireless access point, and a first set of at least one first station in wireless communication with the first wireless access point, the method comprising:

controlling access parameters at the first wireless access point for communications with a first station in the set of at least one first station; and

controlling access parameters at an additional wireless access point for communications with an additional station in an additional set of at least one additional station, wherein;

the controlling access parameters at the first wireless access point comprises setting a first transmit power threshold for stations with a first transmit opportunity bandwidth access parameter when the additional wireless access point sets a second transmit power threshold for stations with a second transmit opportunity bandwidth access parameter; and

the controlling access parameters at the first wireless access point comprises setting the second transmit power threshold for stations with the first transmit opportunity bandwidth access parameter when the additional wireless access point sets the first transmit power threshold for stations with the second transmit opportunity bandwidth access parameter.

14. The method of claim 13, wherein the controlling comprises controlling access parameters at the first wireless access point for communications with a group or groups of first stations within the first set of at least one first station.

15. The method of claim 13, wherein the access parameters include Enhanced Distributed Channel Access parameters.

16. The method of claim 15, wherein the Enhanced Distributed Channel Access parameters include one or more of a minimum contention window parameter, a maximum contention window parameter, an arbitration interframe spacing parameter, or a transmit opportunity limit parameter.

17. The method of claim 16, wherein:

the Enhanced Distributed Channel Access parameters include a transmit opportunity limit parameter, and

the transmit opportunity limit parameter is selected based on at least one of interference level, clear channel access level, or data rate.

18. The method of claim 13, wherein the access parameters include one or more of a channel bandwidth parameter, a transmit power parameter, or a data rate parameter.

19. The method of claim 18, wherein the data rate parameter includes a modulation and coding scheme parameter.

20. The method of claim 18, wherein the access parameters include a channel bandwidth parameter.

21. The method of claim 18 wherein the access parameters include a transmit opportunity bandwidth parameter.

22. The method of claim 13

wherein the controlling access parameters at the first wireless access point and the controlling access parameters at the additional wireless access point are performed to avoid interference between the first wireless access point and the additional wireless access point.

23. The method of claim 13 wherein:

the controlling access parameters at the first wireless access point comprises setting a channel access parameter for distant stations to a first channel when the additional wireless access point sets the channel access parameter for distant stations to a second channel; and

the controlling access parameters at the first wireless access point comprises setting the channel access parameter for distant stations to the second channel when the additional wireless access point sets the channel access parameter for distant stations to the first channel.

24. The method of claim 13 further comprising:

coordinating between the first wireless access point and the additional wireless access point so that the first wireless access point and the additional wireless access point set power levels to avoid interference between the first wireless access point and the additional wireless access point.