Patent ID: 8891399
Filing Date: 2014-11-18
Classification: H04B,H04J,H04L,H04W

Abstract:
1. A method for transmitting a downlink signal through coordinated beamforming with a neighboring cell at a serving cell in a wireless communication system, comprising: transmitting first subframe information for designating one or more subframes to the neighboring cell; transmitting first Precoding Matrix Index (PMI) restriction related information including one or more PMIs to a User Equipment (UE) of the serving cell, wherein the PMIs form a beam so that interference affecting the neighboring cell in the one or more subframes has a constant characteristic; receiving first Channel State Information (CSI) reporting measured in the one or more subframes based on the first PMI restriction related information from the UE of the serving cell; and transmitting a downlink signal to the UE of the serving cell based on the first CSI reporting, wherein the neighboring cell receives CSI reporting corresponding to the neighboring cell, measured by the UE of the neighboring cell in the one or more subframes.