METHOD FOR AVOIDING INTER-CELL INTERFERENCE IN A MULTI-CELL ENVIRONMENT, PARTICULARLY FOR REDUCING OVERHEAD

摘要

PURPOSE: A method for avoiding inter-cell interference in a multi-cell environment is provided to reduce influences caused by an interfering cell using PMI restriction in connection with rank adaptation.;CONSTITUTION: A mobile station(101) estimates a channel(103) receiving data using a signal received from a base station(102). Based on the estimated channel, the mobile station calculates a CQI such that an MCS(Modulation Coding Scheme) appropriate for a channel status can be applied to a data transmission process of the base station. The mobile station selects a channel coefficient which is the most appropriate for the channel status, from a known codebook using the estimated channel and codebook. Channel information, which has been calculated by the mobile station using the estimated channel, is transferred over a feedback channel(106) established between the base station and the mobile station. In this case, the channel information may be transferred to the base station by 'analog feedback'. The term 'analog feedback' means that the estimated channel information itself is fed back, not an fabricated form of the estimated channel information, such as quantized form by restricting the information to several quantized values and the transmitting the quantized value with an index indicating that. The base station transmits data to the mobile station using the channel information received from the mobile station 101, the selected MCS, and the precoding vector of the codebook.;COPYRIGHT KIPO 2010