Patent ID: 8228849

Claim:
A Wireless Local Area Network (WLAN) device, comprising: a first baseband processor interface for receiving, processing and generating digital data; a first radio configured to receive the first digital data and to transmit radio frequency (RF) signals in a first frequency band of a plurality of frequency bands according to a first communication protocol and to receive RF signals in the first frequency band and to produce corresponding digital data to the first baseband processor interface; a second baseband processor interface for receiving, processing and generating second digital data; a second radio configured to receive the second digital data and for transmitting RF signals in a second frequency band of the plurality of frequency bands according to a second communication protocol and to receive RF signals in the second frequency band and to produce corresponding digital data to the second baseband processor interface; at least one baseband processor that transmits outgoing data and receives ingoing data through the first and second baseband processor interfaces; and band selection logic configured to scan a plurality of channels in the first and second frequency bands and to select therefrom a channel for a subsequent communication, the band selection logic further configured to: when all of the plurality of frequency bands are unoccupied, select the frequency band from a pre-computed frequency band rank table; and when at least one frequency band of the plurality of frequency bands is occupied, scan the occupied frequency band, and select a frequency band of the plurality of bands that supports a maximum physical-layer rate.