Method and apparatus for sending and receiving channel state information in multiple-input multiple-output network wireless communication systems

Patent metadata

Field	Value
Publication number	US-11190240-B2
Application number	US-201514822519-A
Country	US
Kind code	B2
Filing date	Aug 10, 2015
Priority date	Dec 30, 2009
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

A method and an apparatus are provided for transmitting channel state information (CSI) by a terminal in a communication system. The method includes receiving a first signal from a first serving cell; receiving a second signal from a second serving cell; calculating first CSI for the first serving cell based on the first signal; calculating second CSI for the first serving cell based on the first signal; calculating first CSI for the second serving cell based on the second signal; calculating second CSI for the second serving cell based on the second signal; transmitting the first CSI and the second CSI for the first serving cell respectively; and transmitting the first CSI and the second CSI for the second serving cell respectively.

First claim

What is claimed is:

1. A method for transmitting channel state information (CSI) by a terminal in a communication system supporting connections between the terminal and a plurality of serving cells, the method comprising:
receiving a first reference signal from a first serving cell;
receiving a second reference signal from a second serving cell;
calculating a first precoding matrix indicator (PMI) for the first serving cell based on the first reference signal;
calculating a second PMI for the first serving cell based on the first reference signal;
calculating a third PMI for the second serving cell based on the second reference signal;
calculating a fourth PMI for the second serving cell based on the second reference signal;
transmitting, to the first serving cell, the first PMI and the second PMI, wherein each of the first PMI and the second PMI is an index, and a combination of the first PMI and the second PMI indicates a first precoding matrix included in a first codebook for the first serving cell; and
transmitting, to the second serving cell, the third PMI and the fourth PMI, wherein each of the third PMI and the fourth PMI is an index, and a combination of the third PMI and the fourth PMI indicates a second precoding matrix included in a second codebook for the second serving cell.

2. The method of claim 1 , wherein transmitting the first PMI and the second PMI comprises:
transmitting the first PMI on a first channel according to first time information; and
transmitting the second PMI on the first channel according to second time information.

3. The method of claim 1 , wherein transmitting the third PMI and the fourth PMI comprises:
transmitting the third PMI on a second channel according to third time information; and
transmitting the fourth PMI on the second channel according to fourth time information.

4. A method for receiving channel state information (CSI) by a first base station in a communication system supporting connections between a terminal and a plurality of serving cells, the method comprising:
transmitting a first reference signal to the terminal; and
receiving, from the terminal, a first precoding matrix indicator (PMI) and a second PMI for a first serving cell of the first base station, wherein each of the first PMI and the second PMI is an index, and a combination of the first PMI and the second PMI indicates a first precoding matrix included in a first codebook for the first serving cell,
wherein the first PMI and the second PMI are calculated based on the first reference signal transmitted from the first base station, and
wherein a third PMI and a fourth PMI for a second serving cell of a second base station are calculated based on a second reference signal transmitted from the second base station, wherein each of the third PMI and the fourth PMI is an index, and a combination of the third PMI and the fourth PMI indicates a second precoding matrix included in a second codebook for the at least one second serving cell.

5. The method of claim 4 , wherein receiving the first PMI and the second PMI comprises:
receiving the first PMI on a first channel according to first time information; and
receiving the second PMI on the first channel according to second time information.

6. The method of claim 4 , wherein the third PMI is transmitted to the second base station on a second channel according to third time information, and
wherein the fourth PMI is transmitted to the second base station on the second channel according to fourth time information.

7. A terminal for transmitting channel state information (CSI) in a communication system supporting connections between the terminal and a plurality of serving cells, the terminal comprising:
a transceiver; and
a controller configured to:
receive, via the transceiver, a first reference signal from a first serving cell,
receive, via the transceiver, a second reference signal from a second serving cell,
calculate a first precoding matrix indicator (PMI) for the first serving cell based on the first reference signal,
calculate a second PMI for the first serving cell based on the first reference signal,
calculate a third PMI for the second serving cell based on the second reference signal,
calculate a fourth PMI for the second serving cell based on the second reference signal,
transmit, via the transceiver, the first PMI and the second PMI, wherein each of the first PMI and the second PMI is an index, and a combination of the first PMI and the second PMI indicates a first precoding matrix included in a first codebook for the first serving cell, and
transmit, via the transceiver, the third PMI and the fourth PMI, wherein each of the third PMI and the fourth PMI is an index, and a combination of the third PMI and the fourth PMI indicates a second precoding matrix included in a second codebook for the second serving cell.

8. The terminal of claim 7 , wherein the controller is further configured to:
transmit the first PMI on a first channel according to first time information, and
transmit the second PMI on the first channel according to second time information.

9. The terminal of claim 7 , wherein the controller is further configured to:
transmit the third PMI on a second channel according to third time information, and
transmit the fourth PMI on the second channel according to fourth time information.

10. A first base station for receiving channel state information (CSI) in a communication system supporting connections between a terminal and a plurality of serving cells, the first base station comprising:
a transceiver; and
a controller configured to:
transmit, via the transceiver, a first reference signal to the terminal, and
receive, via the transceiver, from the terminal, a first precoding matrix indicator (PMI) and a second PMI for a first serving cell of the first base station, wherein each of the first PMI and the second PMI is an index, and a combination of the first PMI and the second PMI indicates a first precoding matrix included in a first codebook for the first serving cell,

wherein the first PMI and the second PMI are calculated based on the first reference signal transmitted from the first base station, and
wherein a third PMI and a fourth PMI for a second serving cell of a second base station are calculated based on a second reference signal transmitted from the second base station, wherein each of the third PMI and the fourth PMI is an index, and a combination of the third PMI and the fourth PMI indicates a second precoding matrix included in a second codebook for the second serving cell.

11. The first base station of claim 10 , wherein the controller is further configured to:
receive the first PMI on a first channel according to first time information; and
receive the second PMI on the first channel according to second time information.

12. The first base station of claim 10 , wherein the third PMI is transmitted to the second base station on a second channel according to third time information, and
wherein the fourth PMI is transmitted to the second base station on the second channel according to fourth time information.

Assignees

• Samsung Electronics Co Ltd
• Univ Yonsei Iacf

Inventors

• Lee In Ho
• Mun Cheol
• Lee Juho
• Han Jin Kyu
• Yook Jong Gwan

Classifications

• H04B7/0417 Primary

  Feedback systems · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04W88/08

  Access point devices · CPC title