# US 10,122,497 B2 · Device and method for communicating channel state information reference signal (CSI-RS) in wireless communication system

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- Number: US 10,122,497 B2
- Document ID: US10122497B2
- Status: Granted
- Kind: B2
- Application number: 15/790,695
- Filed: 2017-10-23
- Published: 2018-02-15
- Granted: 2018-11-06
- Earliest claimed: 2010-01-12
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Youn Sun Kim; Jin Kyu Han; Sung Tae Kim; Myung Hoon Yeon; Cheng Shan; In Ho Lee
- Web page: https://patentgrep.com/patent/US10122497B2

## CPC

- H04L 1/0693: {Partial feedback, e.g. partial channel state information [CSI]}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 5/0073: {Allocation arrangements that take into account other cell interferences}
- H04L 25/0226: {sounding signals per se}
- H04W 72/04: Wireless resource allocation
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/542: using measured or perceived quality
- H04B 17/24: with feedback of measurements to the transmitter
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof}
- H04L 1/06: using space diversity
- H04L 5/0082: {at predetermined intervals}
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 2025/03426: {transmission using multiple-input and multiple-output channels}
- H04L 2025/03802: {Signalling on the reverse channel}
- H04W 72/54: based on quality criteria
- Y02D 30/70: in wireless communication networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A method for wireless communication by a terminal, a method for wireless communication by a base station, the terminal, and the base station, are provided. The method for wireless communication by the terminal includes receiving first information comprising a muting subframe interval, a subframe offset, and a muting position of a resource element in a resource block, checking presence of a data in a subframe, determining the resource element to be muted in the subframe based on the muting subframe interval, the subframe offset, and the muting position, if the data is present, and receiving the data on a physical downlink shared channel (PDSCH) based on the result of the determining step.

## Claims

### Claim 1

A method for wireless communication by a terminal, the method comprising:
receiving first information related to a first type of channel state information reference signal (CSI-RS), from a base station;
determining resource blocks in which at least one of the first type of CSI-RS is transmitted based on the first information, the at least one of the first type of CSI-RS is transmitted in one of even index resource blocks or odd index resource blocks;
measuring a downlink channel using the at least one of the first type of CSI-RS received in the determined resource blocks; and
transmitting channel state information based on the downlink channel, to the base station.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
receiving second information related to a second type of CSI-RS; and
determining resource blocks in which a resource element is muted based on the second information.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first type of CSI-RS is non-zero power CSI-RS and the second type of CSI-RS is zero-power CSI-RS.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first information includes an offset and periodicity related to the first type of CSI-RS.

### Claim 5

A method for mobile communication by a base station, the method comprising:
generating first information related to a first type of channel state information reference signal (CSI-RS);
transmitting the first information to a terminal; and
receiving channel state information based on a measured downlink channel, from the terminal,
wherein the downlink channel is measured by the terminal using at least one of the first type of CSI-RS transmitted in resource blocks determined based on the first information, and
wherein the at least one of the first type of CSI-RS is transmitted in one of even index resource blocks or odd index resource blocks.

### Claim 6 (depends on 5)

The method of claim 5, further comprising:
transmitting second information related to a second type of CSI-RS,
wherein the second information is used to determine resource blocks in which a resource element is muted.

### Claim 7 (depends on 6)

The method of claim 6, wherein the first type of CSI-RS is non-zero power CSI-RS and the second type of CSI-RS is zero-power CSI-RS.

### Claim 8 (depends on 5)

The method of claim 5, wherein the first information includes an offset and periodicity related to the first type of CSI-RS.

### Claim 9

A terminal for mobile communication, the terminal comprising:
a transceiver; and
a controller configured to:
receive first information related to a first type of channel state information reference signal (CSI-RS), from a base station,
determine resource blocks in which at least one of the first type of CSI-RS is transmitted based on the first information, the at least one of the first type of CSI-RS is transmitted in one of even index resource blocks or odd index resource blocks,
measure a downlink channel using the at least one of the first type of CSI-RS received in the determined resource blocks, and
transmit channel state information based on the measured downlink channel, to the base station.

### Claim 10 (depends on 9)

The terminal of claim 9, wherein the controller is configured to:
receive second information related to a second type of CSI-RS, and
determine resource blocks in which a resource element is muted based on the second information.

### Claim 11 (depends on 10)

The terminal of claim 10, wherein the first type of CSI-RS is non-zero power CSI-RS and the second type of CSI-RS is zero-power CSI-RS.

### Claim 12 (depends on 9)

The terminal of claim 9, wherein the first information includes an offset and periodicity related to the first type of CSI-RS.

### Claim 13

A base station for mobile communication, the base station comprising:
a transceiver; and
a controller configured to:
generate first information related to a first type of channel state information reference signal (CSI-RS),
transmit the first information to a terminal, and
receive channel state information based on a measured downlink channel, from the terminal,
wherein the downlink channel is measured by the terminal using at least one first type of CSI-RS transmitted in resource blocks determined based on the first information, and
wherein the at least one of the first type of CSI-RS is transmitted in one of even index resource blocks or odd index resource blocks.

### Claim 14 (depends on 13)

The base station of claim 13,
wherein the controller is configured to transmit second information related to a second type of CSI-RS,
wherein the second information is used to determine resource blocks in which a resource element is muted.

### Claim 15 (depends on 14)

The base station of claim 14, wherein the first type of CSI-RS is non-zero power CSI-RS and the second type of CSI-RS is zero-power CSI-RS.

### Claim 16 (depends on 13)

The base station of claim 13, wherein the first information includes an offset and periodicity related to the first type of CSI-RS.