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BASE STATION AND MOBILE STATION FOR OFDMA CELLULAR SYSTEM

  • US 20120120876A1
  • Filed: 01/24/2012
  • Published: 05/17/2012
  • Est. Priority Date: 03/17/2008
  • Status: Abandoned Application
First Claim
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1. A base station comprising:

  • an antenna for communicating radio frequency (RF) signals with a mobile station;

    a front end unit for converting the RF signal received by the antenna into an uplink baseband signal, and converting a downlink baseband signal to be transmitted to the mobile station into an RF signal to output the RF signal to the antenna;

    a demodulation processing unit for demodulating the uplink baseband signal;

    an uplink-timing detector for detecting a reception timing gap of an uplink signal transmitted by the mobile station, on the basis of the uplink baseband signal;

    a time alignment (TA) control signal generator for generating a TA control signal based on the uplink signal reception timing gap detected by the unlink-timing detector;

    a transmission condition change signal generator which generates a transmission change signal;

    a modulation processing unit for multiplexing a downlink data signal for the mobile station and a control signal includes the TA control signal and a signal for changing a transmission condition of the uplink signal in the mobile station based on a result of a comparison between a predetermined threshold and the uplink signal reception timing gap.

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