Patent ID: 6463049
Filing Date: 2002-10-08
Classification: H04B,H04J,H04W

Abstract:
A radio terminal, for use in a time-division multiple access communication system, capable of adjusting a transmit timing by using a measured internal delay time, the radio terminal comprising:an antenna; means coupled with said antenna and having an input terminal and an output terminal for using said antenna both for transmission and reception, respectively; means for converting a transmission signal into a transmission band signal to feed said input terminal; means for converting a reception band signal from said output terminal into a demodulated signal; means for generating the reference pulse signal; means, activated at latest at the same time as said generating a reference pulse signal, for coupling said reference signal instead of said transmission signal with said means for converting a transmission signal; means for causing said means for converting a reception band signal to select a channel identical to said transmission band; means for counting clock pulses of a clock signal for a time period from said generating the reference pulse signal to said reference signal returning as said demodulated signal to provide a number of counted clock pulses, Nd, corresponding to said time period wherein said time period being said internal delay time; and means for providing a transmit timing signal after counting Ntâˆ’Nd clock pulses after a detection of a time slot assigned to the radio terminal from said demodulated signal, where Nt is a pulse count corresponding to a transmit timing at said antenna.