Patent ID: 7379741

Claim:
A sub-carrier allocation method, comprising: selecting a number of cells having a strongest inter-cell interference among cells in a multiple-cell environment; selecting mutually exclusive sub-carrier sets for each cell selected having the strongest interference; allocating the selected mutually exclusive sub-carrier subsets to each cell, wherein the allocated sub-carrier sets are applied with a different transmission power according to a channel state of each sub-carrier and the mutually exclusive sub-carrier subsets is transmitted by using at least one of an omni-directional antenna, a 120°-directional antenna and a 60°-directional antenna; obtaining a total number of sub-carriers requested by terminals in a cell; comparing the obtained total number of sub-carriers with a total number of available sub-carriers in the cell; allocating the available sub-carriers of the cell to as many of the terminals in the cell as possible; and allocating sub-carriers of the other cell to any remaining terminals that were not allocated in the cell.