Adaptive subchannel and bit allocation method using partial channel information feedback in an orthogonal frequency division multiple access communication system

An adaptive subchannel and bit allocation method in a wireless communication system, the method comprising:

• determining, by a mobile station being located in a boundary between base stations constituting the wireless communication system, feedback band indexes of subcarrier bands with a best channel condition from among all feedback band indexes for all of a plurality of subcarrier bands by using feedback band allocation information of previous channels, and feeding back feedback information including the determined feedback band indexes to a base station, wherein a number of feedback band indexes of subcarrier bands with the best channel condition is less than a number of all feedback band indexes for all of the plurality of subcarrier bands;
• transmitting, by the base station, band allocation information generated using the feedback information to the mobile station;
• transmitting, by the mobile station, a pilot for adaptive modulation and coding (AMC) to the base station using the received band allocation information from the base station;
• and
• estimating, by the base station, a channel using the received pilot, and allocating bits for a band, which is allocated using the band allocation information, according to a channel estimation result.

An adaptive subchannel and bit allocation method in a wireless communication system, the method comprising:

• analyzing, by a mobile station, channel quality information of a subchannel at a predetermined period and determining feedback band indexes with a predetermined maximum decision criterion based on the channel quality information from among all feedback band indexes for all of a plurality of subcarrier bands, and transmitting the determined feedback band indexes and a pilot for uplink adaptive modulation and coding (AMC) to a base station, the mobile station being located in a boundary between base stations constituting the wireless communication system, wherein each of the subchannels is divided into a diversity subchannel for acquisition of frequency diversity gain and an AMC subchannel for high-speed, high-capacity data transmission, and wherein a number of determined feedback band indexes with the predetermined maximum decision criterion is less than a number of all feedback band indexes for all of the plurality of subcarrier bands;
• and
• estimating, by the base station, a channel using the pilot transmitted from the mobile station and allocating a downlink band and bits for the downlink band using feedback information including the feedback band indexes according to a channel estimation result and performing AMC using the allocated downlink band;
• wherein determining the feedback band indexes with the predetermined maximum decision criterion from among all the feedback band indexes for all of the plurality of subcarrier bands comprises determining the feedback band indexes of subcarrier bands with a best channel condition among the subchannels.

An adaptive subchannel and bit allocation method in a wireless communication system, the method comprising:

• determining, by a mobile station being located in a boundary between base station constituting the wireless communication system, a feedback band index with a predetermined maximum decision criterion by using feedback band allocation information of a previous channel, and feeding back feedback information including the determined feedback band index to a base station;
• transmitting, by the base station, band allocation information generated using the feedback information to the mobile station;
• determining, by the mobile station, feedback band indexes of subcarrier bands with a next maximum decision criterion, except for the feedback band index with the predetermined maximum decision criterion, and feeding back the determined feedback band indexes and a decision criterion value, wherein a number of feedback band indexes of subcarrier bands with the next maximum decision criterion is less than a number of all feedback band indexes for all of a plurality of subcarrier bands;
• and
• allocating, by the base station, a downlink band and bits for the downlink band using feedback information including the feedback band indexes and performing AMC using the allocated downlink band;
• wherein the feedback band index with the predetermined maximum decision criterion is a feedback band index of a subcarrier band with a best channel condition among the subchannels.