Patent ID: 9379960
Filing Date: 2016-06-28
CPC Classification: H04B,H04L

Claim Text:
1. A method of measuring a channel state in a multi-node distributed system, the method comprising: receiving, by a user equipment (UE), Channel State Information-Reference Signal (CSI-RS) configuration information from a node, wherein the node is one of a plurality of nodes that make up a node set in the multi-node distributed system; and determining, by the UE, internal interference and external interference; and transmitting Channel State Information (CSI) based on the internal interference and the external interference to the node, wherein the CSI-RS configuration information includes an internal interference measurement field and an external interference field, wherein the internal interference field includes information related to at least one first node among the plurality of nodes, wherein the at least one first node transmits a non-zero power CSI-RS to determine internal interference in the node set, wherein the external interference field includes information related to a second node among the plurality of nodes, wherein the second node transmits a zero power CSI-RS to determine external interference in the node set, wherein the UE computes the external interference based on the zero-power CSI-RS and the internal interference based on the non-zero-power CSI-RS, and wherein the zero power CSI-RS is a CSI-RS in which an energy value of a resource element is 0.