Wireless base station, mobile station, radio communication system, and radio communication method

Abstract

The object of the present invention is to achieve reduction of interference between cells and improvement of maximum throughput so as to improve spectrum efficiency. A wireless base station (10) which transmits a radio signal between itself and a plurality of mobile stations (20) by means of OFDMA includes: a multiplexing part (13) for generating user data; a channel assignment control part (14) for selecting a plurality sets of sub-carriers among a plurality of sub-carriers so as to constitute a radio frame containing sub-channels assigned to each of the plurality sets of sub-carriers and for setting in the radio frame the user data and control data by means of orthogonal frequency division multiplexing; and a transmission part (16) for transmitting a radio signal containing the radio frame; where, the channel assignment control part (14) is constituted so that the radio frame is divided into 2 zones for the control and user data and all the sub-channels in the zone for control data are divided into groups for each of sectors; the control data is allocated on the corresponding divided groups; and the user data is allocated on all the sub-channels in the zone for user data.

Description

technical field [0001] The present invention relates to a radio base station, a mobile station, a radio communication system and a radio communication method. Background technique [0002] Conventionally, a mobile communication system using OFDMA (Orthogonal Frequency Division Multiple Access: Orthogonal Frequency Division Multiple Access) is known. This OFDMA implements communication between a wireless base station and a mobile station by dividing a carrier signal into a plurality of orthogonal subcarriers. between multiple access. Details of this communication method are described in Non-Patent Document 1 below. As the channel allocation method in the mobile communication system using OFDMA, it can be listed Figure 15 (a) and Figure 15 2 ways shown in (b). exist Figure 15 In the method shown in (a), subcarriers of the same frequency band are allocated to each sector S of one radio base station 1 , S 2 , S 3 ,exist Figure 15 In the method shown in (b), the frequenc...

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Problems solved by technology

[0007] In addition, the allocation method described in the above-mentioned Patent Document 1 prevents a decrease in throughput by allocating all frequency bands in the inner area, but it is necessary to divide the user data part in the radio frame into two in time on the outer area and the inner area of ​​the cell, Thus the throughput improvement is not that great

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