Patent ID: 7995532

Claim:
A radio apparatus for allocating a time slot to which a plurality of subcarriers are assigned, to a terminal apparatus, the radio apparatus comprising: an acquiring unit which acquires a strength of signals between said radio apparatus and the terminal apparatus; a group specifying unit which specifies a group, containing the strength acquired by said acquiring unit, among a plurality of groups wherein the plurality of groups are predefined in a manner such that ranges of strength values for the plurality of groups differ respectively from the strength acquired by said acquiring unit; a slot selector which selects a time slot corresponding to the group specified by said group specifying unit wherein time slots to be allocated are predefined respectively for the plurality of groups predefined by said group specifying unit; a subcarrier selector which selects a subcarrier to be assigned to the terminal apparatus, from among a plurality of subcarriers contained in the time slot selected by said slot selector; a communication executing unit which performs communications between said radio apparatus and the terminal apparatus by using the time slot selected by said slot selector and the subcarrier selected by said subcarrier selector; and a specifying unit which specifies a reduction of transmission power to the terminal apparatus when all of the plurality of subcarriers contained in the time slot selected by said slot selector are assigned to other terminal apparatuses, wherein as a time slot allocated anew to the terminal apparatus said slot selector selects a time slot corresponding to a group containing a strength that corresponds to the reduced power.