Apparatus and method for allocating frequencies in an OFDM mobile communication system supporting high speed downlink packet access service

A method for receiving an allocated frequency resource for receiving high-speed downlink packet data in an orthogonal frequency division multiplexing (OFDM) mobile communication system, the method comprising the steps of:

• measuring channel quality per frequency using an OFDM signal received from a base station through multiple subcarrier channels;
• measuring mobility of a user equipment (UE) that receives the OFDM signal;
• determining whether the UE moves at high speed according to the measured mobility;
• if the UE moves at high speed, including mobility information indicating the measured mobility in feedback information, and transmitting the feedback information to the base station;
• and
• if the UE does not move at high speed, including mobility information indicating the measured mobility and channel information indicating the channel quality in feedback information, and transmitting the feedback information to the base station.

A user equipment (UE) apparatus for receiving an allocated frequency resource for receiving high-speed downlink packet data in an orthogonal frequency division multiplexing (OFDM) mobile communication system, the apparatus comprising:

• a channel measurer for measuring channel quality per frequency using an OFDM signal received from a base station through a multipath channel;
• a mobility measurer for measuring mobility of the UE;
• a feedback information generator for determining whether the UE moves at high speed according to the measured mobility, including mobility information indicating the measured mobility in feedback information if the UE moves at high speed;
• and including the mobility information and channel information in the feedback information if the UE does not move at high speed;
• and
• a transmitter for transmitting the feedback information to the base station.