Method and apparatus for generating and transmitting channel feedback in mobile communication system employing two dimensional antenna array

Patent metadata

Field	Value
Publication number	US-9806780-B2
Application number	US-201514720239-A
Country	US
Kind code	B2
Filing date	May 22, 2015
Priority date	May 22, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present disclosure relates to a communication method and system for converging a 5 th -Generation (5G) communication system for supporting higher data rates beyond a 4 th -Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Provided are a method and user equipment for sending feedback information to a base station. The method includes receiving a Channel Status Indication Reference Signal (CSI-RS) from the base station; generating feedback information on a basis of the received CSI-RS; and transmitting the generated feedback information to the base station, wherein generating feedback information includes selecting a precoding matrix for each antenna port group of the base station and selecting an additional precoding matrix on a basis of a relationship between the antenna port groups of the base station.

First claim

What is claimed is:

1. A method of a user equipment to send feedback information to a base station, the method comprising:
receiving a channel status indication reference signal (CSI-RS) from a base station;
selecting a precoding matrix for each antenna port group of the base station;
determining an additional precoding matrix to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the precoding matrixes selected respectively for the antenna port groups and the additional precoding matrix;
generating feedback information comprising the selected precoding matrix and the additional precoding matrix, on a basis of the received CSI-RS; and
transmitting the generated feedback information to the base station.

2. The method of claim 1 , wherein transmitting the generated feedback information comprises transmitting the additional precoding matrix via the second channel.

3. A method of a user equipment to send feedback information to a base station, the method comprising:
receiving a channel status indication reference signal (CSI-RS) from a base station;
selecting a precoding matrix for all antenna port groups of the base station;
determining an additional precoding matrix to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the precoding matrixes for all of the antenna port groups and the additional precoding matrix;
generating feedback information comprising the selected precoding matrix and the additional precoding matrix, on a basis of the received CSI-RS; and
transmitting the generated feedback information to the base station.

4. The method of claim 3 , wherein transmitting the generated feedback information comprises transmitting the additional precoding matrix via the second channel.

5. The method of claim 1 , wherein the precoding matrixes and the additional precoding matrix comprise a first index indicating candidate beamforming vectors selectable for a current channel between the base station and the user equipment, and a second index for selecting a beamforming vector to be used.

6. A method of a user equipment to send feedback information to a base station, the method comprising:
receiving feedback configuration information from the base station;
receiving a channel status indication reference signal (CSI-RS) from the base station;
selecting a precoding matrix for each antenna port group of the base station;
determining an additional precoding matrix to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the precoding matrixes selected respectively for the antenna port groups and the additional precoding matrix;
generating feedback information comprising the selected precoding matrix and the additional precoding matrix, on a basis of the received feedback configuration information and the CSI-RS; and
transmitting the generated feedback information to the base station,
wherein receiving feedback configuration information comprises receiving feedback configuration information corresponding to antenna port groups of the base station and receiving additional feedback configuration information based on a relationship between the antenna port groups.

7. A method of a user equipment to send feedback information to a base station, the method comprising:
transmitting first feedback information generated based on a first channel status indication reference signal (CSI-RS) from the base station;
receiving a second CSI-RS beamformed on a basis of the first feedback information from the base station;
generating second feedback information on a basis of the received second CSI-RS, to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the first feedback information and the second feedback information; and
transmitting the second feedback information to the base station.

8. A method of a base station to receive feedback information from a user equipment, the method comprising:
transmitting feedback configuration information to a user equipment (UE);
transmitting a channel status indication reference signal (CSI-RS) to the UE; and
receiving feedback information generated based on the feedback configuration information and the CSI-RS from the user equipment,
wherein the feedback information is generated, by the UE, to comprise a precoding matrix and an additional precoding matrix, the precoding matrix is selected for each antenna port group of the base station, and the additional precoding matrix is determined to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the precoding matrixes selected respectively for the antenna port groups and the additional precoding matrix.

9. A method of a base station to receive feedback information from a user equipment (UE), the method comprising:
receiving first feedback information from the user equipment;
transmitting a channel status indication reference signal (CSI-RS) beamformed on the basis of the first feedback information to the user equipment; and
receiving second feedback information generated based on the CSI-RS from the UE,
wherein the second feedback information is generated, by the UE, to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the first feedback information and the second feedback information.

10. A user equipment capable of sending feedback information to a base station, comprising:
a communicator configured to transmit and receive signals; and
a controller configured to control the communicator to receive a channel status indication reference signal (CSI-RS) from a base station, select a precoding matrix for each antenna port group of the base station, determine an additional precoding matrix to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the precoding matrixes selected respectively for the antenna port groups and the additional precoding matrix, generate feedback information comprising the selected precoding matrix and the additional precoding matrix, on a basis of the received CSI-RS, and control the communicator to transmit the generated feedback information to the base station.

11. The user equipment of claim 10 , wherein the controller is further configured to control the communicator to transmit the additional precoding matrix via the second channel.

12. A user equipment capable of sending feedback information to a base station, comprising:
a communicator configured to send and receive signals to and from the base station; and
a controller configured to control the communicator to receive a channel status indication reference signal (CSI-RS) from the base station, select a precoding matrix for all antenna port groups of the base station, determine an additional precoding matrix to maximize a signal-to-noise ratio (SNR) of a signal, transmitted using a first channel which is based on a second channel corresponding to the precoding matrixes for all of the antenna port groups and the additional precoding matrix, generate feedback information comprising the selected precoding matrix and the additional precoding matrix, on a basis of the received CSI-RS, and control the communicator to transmit the generated feedback information to the base station.

13. The user equipmen

Assignees

• Samsung Electronics Co Ltd
• Samsung Electronics Co Ltd

Inventors

• Ji Hyoungju
• Kim Younsun
• Lee Juho
• Lee Hyojin
• Kwak Youngwoo

Classifications

• H04B7/0617

  for beam forming · CPC title

• H04J11/0023

  Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541) · CPC title

• H04B7/0658

  Feedback reduction · CPC title

• H04B1/707

  using direct sequence modulation · CPC title

• H04B7/0626

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