Patent ID: 9258066
Filing Date: 2016-02-09
CPC Classification: H04B,H04W

Claim Text:
1. An interference removal method in a multi-node system, the interference removal method comprising: receiving, by a user equipment (UE), node information from a base station; receiving, by the UE, a first reference signal from an objective node; receiving, by the UE, a second reference signal from an interference node; constructing, by the UE, a receive filter and a first pre-coding matrix to be applied to the objective node by using the node information, the first reference signal, and the second reference signal; transmitting, by the UE, the first pre-coding matrix to the base station as feedback; receiving, by the UE, a receive signal including first data transmitted from the objective node and second data transmitted from the interference node; applying, by the UE, the receive filter to remove an interference due to the second data; and decoding, by the UE, the first data after removing the interference, wherein the node information is a singular message, wherein the node information includes configuration information about the first reference signal and the second reference signal, wherein the configuration information includes information about a number of antenna ports of the objective node and the interference node, a number of data streams, and a node identifier (ID), wherein a pattern of the first or second reference signal from the interference node is determined according to the number of antenna ports, the number of data streams and the node ID, wherein the node information further includes information related to a second pre-coding matrix associated with the second reference signal from the interference node, wherein the node information further includes information about a scheduling method of the interference node indicating whether the first pre-coding matrix is changed dynamically, semi-statically, or statically, wherein the node information further includes a field indicating whether to apply removing interference caused by the second reference signal from the interference node, and wherein the first data is pre-coded by applying the first pre-coding matrix, and the receive filter is constructed to exist in a null space of an interference channel matrix.