System for allocating channels in a multi-radio wireless LAN array

• US 9,001,764 B2
• Filed: 12/31/2012
• Issued: 04/07/2015
• Est. Priority Date: 05/13/2008
• Status: Active Grant

• Current Assignee: Cambium Networks Limited (Cambium Networks Corporation)
• Original Assignee: Xirrus Incorporated
• Inventors: Gates, Dirk Ion, Mathews, James Kirk
• Primary Examiner(s): KHAJURIA, SHRIPAL K
• Application Number:
  US13/732,253
• Publication Number:
  US 20140010098A1
• Time in Patent Office: 827 Days
• Field of Search: 370/329
• US Class Current: 370/329
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A channel allocation system for allocating channels in a frequency band to a plurality of radios in close proximity so as to minimize co-channel interference. One method for allocating channels involves initially tuning each of the plurality of radios to the same one of the plurality of channels. All of the radios then receive signals from whatever sources and a signal score is determined for each radio. The radios are then tuned to another one of the plurality of channels. The steps of receiving a signal and determining a signal score for each radio are repeated for each of the remaining channels until all channels have been used. The signal scores are then tested against a table of mapping schemes to determine maximum isolation.

Claims

1. A method for allocating channels in a wireless access device having a plurality of radios capable of operating on a plurality of channels, the method comprising:

initially tuning each of the plurality of radios to the same one of the plurality of channels;

receiving signals on all the radios;

determining a signal score at each radio;

tuning each of the plurality of radios to another one of the plurality of channels;

receiving signals on all the radios;

determining signal scores comprising a channel usage factor, wherein calculating the channel usage factor comprises the steps of;

determining a relative signal strength (RSSI);

determining a packet length;

determining a bit rate;

determining a non-wireless access device signal duty cycle; and

calculating;

[(Packet length/bit rate)*(100+RSSI)]+[(Non wireless access device Signal Duty Cycle)*70] at each radio;

repeating the steps of tuning, receiving and determining signal scores until all of the available channels have been used; and

testing the signal scores against a table of mapping schemes to determine maximum isolation.

2. The method for allocating channels in a wireless access device according to claim 1 further comprising:

configuring a spectrum usage matrix by tabulating the channel usage factor for each radio on each channel potentially available.