Method and apparatus for processing feedback information in wireless communication system supporting beamforming

Patent metadata

Field	Value
Publication number	US-9287958-B2
Application number	US-201514626227-A
Country	US
Kind code	B2
Filing date	Feb 19, 2015
Priority date	Feb 20, 2014
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

A method and an apparatus for processing feedback information in a wireless communication system supporting a beamforming are provided. The method includes receiving reference signals for each of at least one of transmitted beams which are transmitted from a base station with respect to each received beam of the terminal, determining reception power related information for a beam combination including each of the at least one of the transmitted beams and the received beam, determining channel capacities for each beam combination targeted beam combinations of which each value is equal to or greater than a certain critical value, as a result of the determining of the reception power related information, and determining best beam related information based on the result of the determining of the channel capacities.

First claim

What is claimed is:

1. A method by a terminal in a wireless communication system supporting a beamforming, the method comprising:
receiving reference signals which are transmitted from a base station via transmission beams of the base station, via reception beams of the terminal;
determining reception power related information for beam combinations of the transmission beams and the reception beams;
identifying, among the beam combinations, at least one first beam combination of which the reception power related information is equal to or greater than a predetermined value; and
determining beam related information by selecting, among the at least one first beam combination, at least one second beam combination based on channel capacities of the at least one first beam combination.

2. The method of claim 1 , wherein the beam related information comprises:
a transmission and reception beam identifier corresponding to the selected at least one second beam combination, and
a precoding matrix index for the transmission and reception beam identifier.

3. The method of claim 2 , wherein the transmission and reception beam identifier is determined by an analog beam and a digital precoding combination.

4. The method of claim 1 , wherein the reception power related information comprises at least one of a received signal strength, a Signal to Noise Ratio (SNR), or a Signal to Interference-pulse-Noise Ratio (SINR) for the beam combinations.

5. A method by a terminal in a wireless communication system supporting a beamforming, the method comprising:
receiving reference signals which are transmitted from a base station via transmission beams of the base station, via reception beams of the terminal;
identifying, among the beam combinations of the transmission beams and the reception beams, predetermined numbers of a first beam combinations maximizing a reception power of the reference signals; and
determining beam related information by selecting, among the first beam combinations, at least one second beam combination based on channel capacities of the first beam combinations.

6. The method of claim 5 ,
wherein the beam related information comprises a transmission and reception beam identifier corresponding to the selected at least one second beam combination, and a precoding matrix index for the transmission and reception beam identifier, and
wherein the transmission and reception best beam identifier is determined by an analog beam and a digital precoding combination.

7. A method by a terminal in a wireless communication system supporting a beamforming, the method comprising:
receiving reference signals which are transmitted from a base station via transmission beams of the base station, via reception beams of the terminal;
identifying channel capacities for beam combinations of the transmission beams and the reception beams; and
determining beam related information by selecting, among the beam combinations, at least one beam combination based on the channel capacities for the beam combinations,
wherein the identifying of the channel capacities comprises averaging a channel state for at least one subcarrier in which at least one of the transmission beams including the same identifier is transmitted, and identifying the channel capacities based on the averaged channel state.

8. The method of claim 7 , wherein the beam related information comprises:
a transmission and reception beam identifier corresponding to the selected at least one beam combination, and
a precoding matrix index for the transmission and reception beam identifier.

9. The method of claim 8 , wherein the transmission and reception beam identifier is determined by an analog beam and a digital precoding combination.

10. The method of claim 7 , wherein the identifying of the channel capacities comprises averaging channel states for all subcarriers in which the at least one of the transmission beams including the same identifier is transmitted, and identifying the channel capacities based on the averaged channel states.

11. The method of claim 7 , wherein the identifying of the channel capacities comprises:
identifying channel capacities for remaining subcarriers except for a random subcarrier among the at least one subcarrier in which the at least one of the transmitted beams having the same identifier is transmitted; and
giving a feedback on a beam combination of which a channel capacity is largest, based on a result of the identifying of the channel capacities.

12. A method by a terminal in a wireless communication system supporting a beamforming, the method comprising:
receiving reference signals which are transmitted from a base station via transmission beams of the base station, via reception beams of the terminal, in a first superframe including at least one frame;
generating first feedback information for beam combinations of the transmission beams and the reception beams, and transmitting the generated first feedback information to the base station at a first predetermined timing;
receiving reference signals which are transmitted from the base station via transmission beams of the base station, via reception beams of the terminal, while a first frame in a second superframe is elapsed after the first superframe is arrived; and
generating second feedback information for the beam combinations based on the first superframe and the first frame in the second superframe, and transmitting the generated second feedback information to the base station at a second predetermined timing.

13. The method of claim 12 , wherein the generating of the second feedback information comprises generating the second feedback information based on the first frame in the second superframe, and a remaining frame except for a frame corresponding to the first frame in the second superframe among frames in the first superframe.

14. The method of claim 12 , wherein an Automatic Gain Control (AGC) for the first feedback information and an AGC for the second feedback information are the same.

15. A terminal in a wireless communication system supporting a beamforming, the terminal comprising:
a transmitting and receiving unit configured to transmit and receive a signal to and from a base station; and
at least one processor configured to:
receive reference signals which are transmitted from a base station via transmission beams of the base station, via reception beams of the terminal,
determine reception power related information for beam combinations of the transmission beams and the reception beams,
identify, among the beam combinations, at least one first beam combination of which the reception power related information is equal to or greater than a predetermined value, and
determine beam related information by selecting, among the at least one first beam combination, at least one second beam combination based on channel capacities of the at least one first beam combination.

16. The terminal of claim 15 , wherein the beam related information comprises a transmission and reception beam identifier corresponding to the selected at least one second beam combination, and a precoding matrix index for the transmission and reception beam identifier.

17. The terminal of claim 16 , wherein the transmission and reception beam identifier is determined by an analog beam and a digital precoding combination.

18. The terminal of claim 15 , wherein the reception power related information comprises at least one of a received signal strength, a Signal to Noise Ratio (SNR), or a Signal to Interference-pulse-Noise Ratio

Assignees

• Samsung Electronics Co Ltd

Inventors

• Son Jaeseung
• Kim Chanhong
• Seol Jiyun
• Kim Taeyoung
• Lee Keonkook

Classifications

• H04B7/06952

  Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04B7/0628 Primary

  Diversity capabilities · CPC title

• H04B7/0695

  using beam selection · CPC title

• H04B7/088

  using beam selection · CPC title