Patent ID: 7724722
Filing Date: 2010-05-25
Classification: H04W

Abstract:
1. A method for transmitting uplink control information in a communication system using an orthogonal frequency division multiple access (OFDMA) scheme, the method comprising the steps of: determining by a mobile station (MS) a target anchor base station (BS) with which the MS desires to communicate from among an active set of the MS that is communicating with a current anchor BS; dividing all codewords in the system into a plurality of codeword groups; selecting a codeword corresponding to the target anchor BS from among the codewords for a fast feedback channel and transmitting, to the current anchor BS, the selected codeword fin requesting a fast cell switching through the fast feedback channel, wherein a first codeword group of the plurality of codeword groups is allocated for identifying at least one anchor BS included in the active set, a second codeword group of the plurality of codeword groups is allocated for transmitting channel quality information, and a third codeword group of the plurality of codeword groups is allocated for transmitting multiple input multiple output (MIMO) mode selection feedback information; receiving a response for the fast cell switching from the current anchor BS in response to the transmitted codeword; and switching the target anchor BS to a new anchor BS of the MS according to the response, wherein codewords of the first codeword group are sequentially allocated to at least one anchor BS included in the active set.