IP Library › Granted Patent US 9,490,888

Granted Patent B2

US 9,490,888 · App. 14/656,351 · Granted Nov 8, 2016

Codebook based channel information feedback method, device and system

Inventors: Qimei Cui (Beijing, CN); Shiyuan Li (Beijing, CN); Xiaofeng Tao (Beijing, CN); Chao Wang (Beijing, CN); Xianjun Yang (Beijing, CN)

Assignee: SONY CORPORATION

H04B7/0639 H04B7/0452 H04B7/0456 H04B7/0478 H04L1/0026 H04W72/042 H04W76/025

View Patent ↗

Loading inventors, assignments & file history…

Monitor This Case

Get email alerts when status or documents change.

Order Certified Copies

Most orders are placed with the USPTO same day — all within 24 business hours.

Order via The Patent Place →

Pre-filled with this patent's details

Quick Facts

Patent No.: US 9,490,888
App. No.: 14/656,351
Granted: Nov 8, 2016
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

A codebook based channel information feedback method, device and system are provided in the present invention. The codebook based channel information feedback method includes: measuring, by a terminal in a communication system, a parameter of a downlink channel between the terminal and a base station of the communication system; selecting a plurality of precoding matrixes from a precoding codebook by using the parameter of the downlink channel, wherein a plurality of the precoding matrixes can be used by both of single-user multi-input multi-output (MIMO) transport mode and multi-user MIMO transport mode, and the precoding codebook is an aggregation of precoding matrixes; and feeding back a first information for indicating a plurality of the precoding matrixes to the base station.

Claims (69)

1. An electronic device for user equipment in a wireless communication system, the electronic device comprising:

circuitry configured to

measure a downlink channel based on a control signaling from a base station;

determine a number of data flows that can be simultaneously received by the user equipment;

select two pre-coding matrices from a pre-coding codebook based on a measurement result of the downlink channel and a selection criterion according to the number of data flows;

determine, for feeding back channel state information to the base station, a first pre-coding matrix indicator and a second pre-coding matrix indicator that correspond to the pre-coding matrices satisfying the selection criterion; and

apply the first pre-coding matrix indicator and the second pre-coding matrix indicator to an uplink channel of the user equipment to feed back the channel state information,

wherein in selecting the two pre-coding matrices, the circuitry is further configured to

generate an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and

select the two pre-coding matrices based on differences between the estimated downlink channel matrix and the pre-coding matrices in the pre-coding codebook, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.

2. The electronic device according to claim 1 , wherein the two pre-coding matrices are adapted to a transmission mode.

3. The electronic device according to claim 1 , wherein

the user equipment is served by the base station via a coordinated multi-point (CoMP) transmission scheme, and

the circuitry is further configured to select the two pre-coding matrices for feeding back channel state information to facilitate the CoMP transmission scheme.

4. The electronic device according to claim 1 , wherein the two pre-coding matrices are applicable for single-user multiple input multiple output (SU-MIMO) transmission and multi-user multiple input multiple output (MU-MIMO) transmission to facilitate dynamic switching between the SU-MIMO transmission and the MU-MIMO transmission.

5. The electronic device according to claim 1 , wherein

the electronic device is the user equipment, and

the electronic device further comprises multiple antennas that are configured to transmit the first and second pre-coding matrix indicators corresponding to the two pre-coding matrices satisfying the selection criterion to the base station.

6. The electronic device according to claim 1 , wherein

the electronic device is the base station, and

the electronic device further comprises multiple antennas that are configured to receive the first and second pre-coding matrix indicators corresponding to the pre-coding matrices satisfying the selection criterion to the base station.

7. The electronic device according to claim 1 , wherein the circuitry is further configured to select the first pre-coding matrix indicator and the second pre-coding matrix indicator on a same number of data flows based on a same codebook.

8. The electronic device according to claim 1 , wherein the circuitry is further configured to

set a first selection criterion in response to the determined number of data flows being equal to one data flow; and

set a second selection criterion in response to the determined number of data flows being greater than one data flow.

9. A method for user equipment in a wireless communication system, the method comprising:

measuring a downlink channel based on a control signaling from a base station;

determining a number of data flows that can be simultaneously received by the user equipment;

selecting, by circuitry, two pre-coding matrices from a pre-coding codebook based on a measurement result of the downlink channel and a selection criterion according to the number of data flows;

determining, by the circuitry for feeding back channel state information to the base station, a first pre-coding matrix indicator and a second pre-coding matrix indicator that correspond to the pre-coding matrices satisfying the selection criterion; and

applying, by the circuitry, the first pre-coding matrix indicator and the second pre-coding matrix indicator to an uplink channel of the user equipment to feed back the channel state information,

wherein the selecting of the two pre-coding matrices is performed by

generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and

selecting the two pre-coding, matrices based on differences between the estimated downlink channel matrix and the pre-coding matrices in the pre-coding codebook, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.

10. A non-transitory computer readable medium having instructions stored therein that, when executed by processing circuitry, cause the processing circuitry to perform a method for a wireless communication system, the method comprising:

measuring a downlink channel based on a control signaling from a base station;

determining a number of data flows that can be simultaneously received by the user equipment;

selecting two pre-coding matrices from a pre-coding codebook based on a measurement result of the downlink channel and a selection criterion according to the number of data flows;

determining, for feeding back channel state information to the base station, a first pre-coding matrix indicator and a second pre-coding matrix indicator that correspond to the pre-coding matrices satisfying the selection criterion; and

applying the first pre-coding matrix indicator and the second pre-coding matrix indicator to an uplink channel of the user equipment to feed back the channel state information,

wherein the selecting of the two pre-coding. matrices is performed by

generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and

selecting the two pre-coding matrices based on differences between the estimated downlink channel matrix and the pre-coding matrices in the pre-coding codebook, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.

11. An electronic device for a base station in a wireless communication system, the electronic device comprising:

circuitry, configured to

acquire a first pre-coding matrix indicator and a second pre-coding matrix indicator from an uplink channel of user equipment;

determine, from a pre-coding codebook, a first pre-coding matrix that corresponds to the first pre-coding matrix indicator and a second pre-coding matrix that corresponds to the second pre-coding matrix indicator; and

generate a third pre-coding matrix for the user equipment based on the first pre-coding matrix and the second pre-coding matrix, wherein

the first pre-coding matrix and the second pre-coding matrix are selected by the user equipment based on a measurement result of a downlink channel between the base station and the user equipment, and a selection criterion according to number of data flows that can be simultaneously received by the user equipment, which generates an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and selects the first pre-coding matrix and the second pre-coding matrix based on differences between the first pre-coding matrix and the second pre-coding matrix, and the estimated downlink channel matrix, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.

12. The electronic device according to claim 11 , wherein the first pre-coding matrix and the second pre-coding matrix are adapted to a transmission mode.

13. The electronic device according to claim 11 , wherein

the base station serves the user equipment via a coordinated multi-point (COMP) transmission scheme, and

the circuitry is further configured to generate the third pre-coding matrix based on the first pre-coding matrix and the second pre-coding matrix to facilitate the CoMP transmission scheme.

14. The electronic device according to claim 11 , wherein the first pre-coding matrix and the second pre-coding matrix are applicable for single-user multiple input multiple output SU-MIMO) transmission and multi-user multiple input multiple output (MU-MIMO) transmission to facilitate dynamic switching between the SU-MIMO transmission and the MU-MIMO transmission.

15. The electronic device according to claim 11 , wherein the circuitry is further configured to select the first pre-coding matrix indicator and the second pre-coding matrix indicator on a same number of data flows based on a same codebook.

16. A method for a base station in a wireless communication system, the method comprising:

acquiring a first pre-coding matrix indicator and a second pre-coding matrix indicator from an uplink channel of user equipment;

determining, by circuitry from a pre-coding codebook, a first pre-coding matrix that corresponds to the first pre-coding matrix indicator and a second pre-coding matrix that corresponds to the second pre-coding matrix indicators indicator; and

generating, by the circuitry, a third pre-coding matrix for the user equipment based on the first pre-coding matrix and the second pre-coding matrix, wherein

generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and

selecting the first pre-coding matrix and the second pre-coding matrix based on differences between the first pre-coding matrix and the second pre-coding matrix, and the estimated downlink channel matrix, the differences including a minimum distance between each of the two pre-coding matrices and the estimated downlink channel matrix.

17. A non-transitory computer readable medium having instructions stored therein that, when executed by processing circuitry, cause the processing circuitry to perform a method for a wireless communication system, the method comprising:

acquiring a first pre-coding matrix indicator and a second pre-coding matrix indicator from an uplink channel of user equipment;

determining, from a pre-coding codebook, a first pre-coding matrix that corresponds to the first pre-coding matrix indicator and a second pre-coding matrix that corresponds to the second pre-coding matrix indicators indicator; and

generating a third pre-coding matrix for the user equipment based on the first pre-coding matrix and the second pre-coding matrix, wherein

generating an estimated downlink channel matrix of the downlink channel based on a pilot signal from the base station, and

Priority Claims (1)

CN 2010 1 0111774 · Feb 11, 2010 · national

Continuity (2)

Division 13522374

Related Publication 20150200719A1 · Jul 16, 2015