# US 12,184,351 B2 · Terminal, radio communication method, base station, and system

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- Number: US 12,184,351 B2
- Document ID: US12184351B2
- Status: Granted
- Kind: B2
- Application number: 17/459,428
- Filed: 2021-08-27
- Published: 2021-12-16
- Granted: 2024-12-31
- Earliest claimed: 2017-01-06
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Kazuaki Takeda; Satoshi Nagata; Chongning Na; Xin Wang; Huiling Jiang; Yuichi Kakishima
- Web page: https://patentgrep.com/patent/US12184351B2

## CPC

- H04B 7/0452: Multi-user MIMO systems
- H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336)
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/02: Terminal devices
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A terminal is disclosed that includes a receiver that receives, via higher layer signaling, configuration information indicating a first resource for interference measurement, a second resource of non-zero power (NZP) channel state information reference signal (CSI-RS) for interference measurement, and a third resource of NZP CSI-RS for channel measurement. The terminal also includes a processor that performs interference measurement by using the first resource or the second resource, and performs channel measurement by using the third resource. The configuration information indicates a plurality of combinations of a third resource candidate and at least one of a first resource candidate and a second resource candidate. The processor uses, for measurement, a combination indicated by downlink control information among the plurality of combinations. In other aspects, a radio communication method, a base station, and a system are also disclosed.

## Claims

### Claim 1

A terminal comprising:
a receiver that receives, via higher layer signaling, configuration information which indicates non-zero power (NZP) resources to which transmit power for channel state information reference signal (CSI-RS) is distributed and indicates zero power (ZP) resources to which transmit power for CSI-RS is not distributed, and receives a downlink control information including an identification information for specifying a channel measurement resource being one from among the NZP resources, a NZP interference measurement resource being one other than the channel measurement resources from among the NZP resources, and a ZP interference measurement resource being one from among the ZP resources; and
a processor that:
specifies, based on the configuration information and the downlink control information, the channel measurement resource, the NZP interference measurement resource, and the ZP interference measurement resource,
measures signal power using the channel measurement resource, and
measures total power of interference and noise using the NZP interference measurement resource and the third ZP interference measurement resource.

### Claim 2 (depends on 1)

The terminal according to claim 1, wherein the configuration information includes information about a CSI-RS port.

### Claim 3

A radio communication method for a terminal, comprising:
receiving, via higher layer signaling, configuration information which indicates non-zero power (NZP) resources to which transmit power for channel state information reference signal (CSI-RS) is distributed and zero power (ZP) resources to which transmit power for CSI-RS is not distributed;
receiving a downlink control information including an identification information for specifying a channel measurement resource being one from among the NZP resources, a NZP interference measurement resource being one other than the channel measurement resources from among the NZP resources, and a ZP interference measurement resource being one from among of the ZP resources;
specifying, based on the configuration information and the downlink control information, the channel measurement resource, the NZP interference measurement resource, and the ZP interference measurement resource;
measuring signal power using the first channel measurement resource; and
measuring total power of interference and noise using the NZP interference measurement resource and the ZP interference measurement resource.

### Claim 4

A base station comprising:
a transmitter that transmits, via higher layer signaling, configuration information which indicates non-zero power (NZP) resources to which transmit power for channel state information reference signal (CSI-RS) is distributed and indicates zero power (ZP) resources to which transmit power for CSI-RS is not distributed, and transmits a downlink control information including an identification information for specifying a channel measurement resource being one from among the NZP resources, a NZP interference measurement resource being one other than the channel measurement resources from among the NZP resources, and a ZP interference measurement resource being one from among of the ZP resources; and
a processor that controls:
specifying, based on the configuration information and the downlink control information, the channel measurement resource, the NZP interference measurement resource, and the ZP interference measurement resource;
measuring signal power using the channel measurement resource; and
measuring total power of interference and noise using the NZP interference measurement resource and the ZP interference measurement resource.

### Claim 5

A system comprising:
a terminal that comprises:
a receiver that receives, via higher layer signaling, configuration information which indicates non-zero power (NZP) resources to which transmit power for channel state information reference signal (CSI-RS) is distributed and indicates zero power (ZP) resources to which transmit power for CSI-RS is not distributed, and receives a downlink control information including an identification information for specifying a channel measurement resource being one from among the NZP resources, a NZP interference measurement resource being one other than the channel measurement resources from among the NZP resources, and a ZP interference measurement resource being one from among of the ZP resources; and
a processor that:
specifies, based on the configuration information and the downlink control information, the channel measurement resource, the NZP interference measurement resource, and the ZP interference measurement resource,
measures signal power using the channel measurement resource, and
measures total power of interference and noise using the NZP interference measurement resource and the ZP interference measurement resource; and
a base station that transmits the configuration information and transmits the downlink control information.