Patent ID: 7706308

Claim:
A wireless communication system for providing a service in a time division duplexing (TDD) mode and a frequency division duplexing (FDD) mode, the system comprising: a mobile station for, during call setup, transmitting a duplexing mode determination factor to a base station, setting a TDD mode or an FDD mode as a reverse mode set by the base station, and setting up a channel for the set reverse mode and a forward channel to perform communication; and a base station for, during call setup, receiving the duplexing mode determination factor from the mobile station, setting a reverse mode to the TDD mode or the FDD mode using the received duplexing mode determination factor, and setting up a reverse channel for the set mode and a TDD mode for forward transmission to communicate with the mobile station; wherein the base station assigns to the mobile station a channel of a forward link and a reverse link in the TDD mode if the mobile station is located in a close area, and a channel of the forward link in the TDD mode and a channel of the reverse link in the TDD mode if the mobile station is located in a remote area; wherein the base station assigns a frequency resource in a predetermined area among frequency resources available in the base station as reverse link resource in the FDD mode for reverse transmission, and assigns the remaining available frequency resources to the forward link and the reverse link in the TDD mode; and wherein the base station sets up a guard time of a predetermined time between switching times of the forward link and the reverse link in the TDD mode, and assigns time slots beginning at a time slot in an area close to the guard time in order of each mobile station nearest to the base station.