Patent ID: 6985498

Claim:
A method of operating a base station transmitter in a frequency division multiplexed communications system the base station transmitter using a set of N tones to communicate information over a first period of time using first signals, said first period of time being at least two seconds long, where N is larger than 10, a plurality of tones in said set of N tones being used in parallel to communicate information for at least a portion of said first period of time; the method comprising: transmitting during a second period of time a second signal including a set of X tones, the X tones in said set of X tones being used at the same time during said second period of time, where X is less than 5, and where at least 80% of a maximum average total base station transmission power used by said base station transmitter during any 1 second period which occurs during said first period of time, is allocated to said set of X tones during said second period of time.