Method and apparatus for channel estimation in a distributed multi-node system
First Claim
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.
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Abstract
Disclosed are a method and an apparatus for channel estimation in a multi-node distributed system. A method for channel state estimation comprises the steps of: a terminal receiving channel state information reference signal (CSI-RS) set-up information; and the terminal calculating interference on the basis of the CSI-RS set-up information and then transmitting channel state information (CSI) based on the interference, wherein the CSI-RS set-up information may include at least one of an external interference measurement field and an internal interference measurement field. Accordingly, during the external interference and internal interference measurements, the node for use in the interference measurements may be controlled by a base station so that interference is accurately measured and feedback of accurate channel information is enabled.
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Citations
8 Claims
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1. A method of measuring a channel state in a multi-node distributed system, the method comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. A user equipment (UE) configured to measure a channel state in a multi-node distributed system, the UE comprising:
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a radio frequency (RF) unit configured to transmit or receive a radio signal; and a processor operatively connected to the RF unit and configured to; receive 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, determine internal interference and external interference, and transmit 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 included 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. - View Dependent Claims (6, 7, 8)
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Specification