Importance

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Abstract

A Time Division Duplex (TDD) communications system includes at least one base station having a first transmitter and a first receiver, and at least one radiotelephone having a second receiver for receiving a first radio frequency signal from the base station during a reception period and a second transmitter for transmitting a second radio frequency signal to the base station during a transmission period. The first radio frequency signal and the second radio frequency signal are characterized by having substantially the same center frequency and bandwidth. The radiotelephone further includes a signal measuring circuit having an input coupled to an output of the second receiver for measuring a signal level of a received first radio frequency signal during a reception period. The radiotelephone further includes a power control circuit coupled to an output of the signal measuring circuit for controlling, in accordance with the measured signal level, a level of the transmitted second radio frequency signal during a transmission period that occurs subsequent to the reception period. The TDD communications system is selected from one of a Time Division Duplex/Time Division Multiple Access system and a Time Division Duplex/Code Division Multiple Access system.

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First Claim