WIRELESS ACCESS POINT ARRAY

• US 20130121328A1
• Filed: 12/31/2012
• Published: 05/16/2013
• Est. Priority Date: 03/09/2005
• Status: Active Grant

• Current Assignee: Cambium Networks Limited (Cambium Networks Corporation)
• Original Assignee: Xirrus Incorporated
• Inventors: Smith, Steve, Gates, Dirk Ion, Laity, Ian, Conley, Michael R., de la Garrigue, Michael, Sauter, Kurt
• Granted Patent: US 8,665,851 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 19/106 using two or more intersecting plane surfaces, e.g. corner reflector antennas
• CPC Class Codes: H01Q 21/205 providing an omnidirectional coverage turnstile aerials H01Q21/26
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A system of at least one wireless access device in a local area network (LAN) having a plurality of transceivers. Each transceiver has a directional antenna positioned in a substantially circular array to communicate signals with a plurality of stations in a corresponding sector. Each sector defines a portion of a coverage area surrounding the wireless access device. The wireless access device has a network interface to a data network, and an array controller to control communication of data between the stations and the transceivers, and between the transceivers and the network interface. The array controller is configured to modify channel assignments so as to minimize channel interference dynamically.

Claims

1. A system for providing access to data network services comprising:

at least one wireless access device comprising;

a plurality of transceivers, each transceiver having a directional antenna, each directional antenna positioned in a substantially circular array to communicate signals with a plurality of stations in a corresponding sector, each sector defining a portion of a coverage area surrounding the wireless access device;

an array controller in signal communication with each of the plurality of transceivers, the array controller configured to;

assign a predetermined channel to each of the plurality of transceivers on which the transceiver communicates with stations in the corresponding sector, where the predetermined channel is unique relative to the channels assigned to the other transceivers;

modify the predetermined channel assignment to each of the plurality of transceivers to dynamically optimize performance; and

control communication of data between the stations and the transceivers, and between the transceivers and the network interface; and

a wired network connected to the at least one wireless access device, the wired network having an interface to at least one data network service;

where the at least one wireless access device communicates with stations within the coverage area and forms a communications path between the wireless stations and the wired network.

2. A system according to claim 1 where each of the plurality of transceivers in the at least one wireless access device is a radio configured to communicate pursuant to the IEEE 802.11a, IEEE 802.11b, or IEEE 802.11g standard.

3. A system according to claim 2 where the plurality of transceivers in the at least one wireless access device covers all available channels in the band defined by IEEE 802.11a, IEEE 802.11b, or IEEE 802.11g.

4. A system according to claim 1 where the array controller in each of the at least one wireless access devices is configured to dynamically modify the predetermined channel assignment pursuant to the standards defined in IEEE 802.11h.

5. A system according to claim 2 where the transceivers in the at least one wireless access device include a first plurality of transceivers configured to operate pursuant to IEEE 802.11 a and a second plurality of transceivers configured to operate pursuant to IEEE 802.11b/g.

6. A system according to claim 5 where each of the first plurality of transceivers is assigned a unique channel defined by 802.11a.

7. A system according to claim 5 where each of the second plurality of transceivers is assigned a unique non-overlapping channel defined by 802.11b/g.

8. A system according to claim 2 where one of the plurality of transceivers is configured to receive only using an omni-directional antenna.

9. A system according to claim 1 where the array controller in each of the at least one wireless access device is configured to monitor performance of the plurality of transceivers by:

detecting a failure of any one of the plurality of transceivers; and

identifying another one of the plurality of transceivers best capable of replacing the failed one of the plurality of transceivers.

10. A system according to claim 1 where the array controller in each of the at least one wireless access device is configured to monitor performance of the plurality of transceivers by:

configuring at least one of the plurality of transceivers to listen to signals communicated between any one of the other transceivers and at least one station;

obtaining data from the at least one of the plurality of transceivers configured to listen; and

determining performance and/or throughput for the plurality of transceivers from the obtained data.

11. A system according to claim 1 further comprising a network management system operable to provide management functions over the at least one wireless access device.

12. A system according to claim 11 where the network management system is configured to receive performance data from a first one of the at least one wireless access device and a second wireless access device, where the network management functions include the function of initiating a modification of channel assignment of the transceivers on either the first or the second wireless access device.

13. A wireless service access area comprising:

a plurality of coverage sectors, each coverage sector defining a space within which a client station may associate with a corresponding one of a plurality of radios mounted in a wireless access device; and

an array controller in signal connection with the plurality of radios, the array controller configured to;

assign a predetermined channel to each of the plurality of radios on which the radio communicates with stations in the corresponding sector, where the predetermined channel is unique relative to the channels assigned to the other radios;

modify the predetermined channel assignment to each of the plurality of radios to dynamically optimize performance; and

control communication of data between the stations and the radios, and between the radios and the network interface;

where the wireless access device includes an interface to a data network to provide access to data network services to stations that associate with the radios.

14. A wireless service access area according to claim 13 where each coverage sector overlaps with at least one adjacent coverage sector such that the client station may associate with at least one other one of the plurality of radios.

15. A wireless service access area according to claim 13 where the plurality of radios form a corresponding plurality of coverage sectors that form a 360°

coverage area.

16. A wireless service access area according to claim 13 where the plurality of radios are controlled to turn on or off in accordance with a desired coverage pattern.

17. A wireless service access area according to claim 16 where the desired coverage pattern is a 180°

coverage pattern.

18. A wireless service access area according to claim 16 where the desired coverage pattern avoids an obstacle that would generate reflected radio signals.

19. A wireless service access area according to claim 13 where the plurality of radios are each controlled to communicate at a designated power level in accordance with a desired coverage pattern.

20. A wireless service access area according to claim 13 where the plurality of radios communicates according to any part of IEEE 802.11.

21. A wireless service access area according to claim 13 where a first plurality of radios communicates according to IEEE 802.11a and a second plurality of radios communicates according to IEEE 802.11b or g.