Method and apparatus for transmitting and receiving uplink random access channel slot in a wireless communication system using beamforming

Patent metadata

Field	Value
Publication number	US-9544919-B2
Application number	US-201414197734-A
Country	US
Kind code	B2
Filing date	Mar 5, 2014
Priority date	Mar 6, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A method and apparatus for transmitting and receiving a signal of Random Access Channel (RACH) in a wireless communication system using beamforming are provided. The reception method includes receiving the signal through each transmission beam of a transmitter from a transmitter, transmitted in each transmission beam by the transmitter, the signal including as many repeated symbols as a total number of reception beams of a receiver, and detecting symbols by switching to reception beams corresponding to the symbols included in the signal during reception of the signal.

First claim

What is claimed is:

1. A method for receiving a signal by a base station in a wireless communication system, the method comprising:
transmitting a synchronization signal and control information for uplink transmission;
receiving a random access signal transmitted through at least one transmission beam of a mobile station by switching a plurality of reception beams of the base station, the random access signal comprising a plurality of symbols corresponding to a number of the plurality of reception beams;
detecting a symbol corresponding to each of the plurality of reception beams from the plurality of symbols comprised in the random access signal; and
if a signal strength of the detected symbol is equal to or larger than a predetermined threshold, transmitting, to the mobile station, information related to a reception beam corresponding to the detected symbol among the plurality of reception beams.

2. The method of claim 1 , wherein the random access signal is allocated to a total frequency band allocated to the wireless communication.

3. The method of claim 1 , wherein the random access signal is allocated to one of subbands obtained by dividing a total frequency band,
wherein other subbands are allocated to random access signals transmitted by other mobile stations.

4. The method of claim 1 , wherein the transmitting of the information related to the reception beam comprises:
determining the reception beam as a best reception beam if the signal strength of the detected symbol is equal to or larger than the predetermined threshold.

5. The method of claim 1 , wherein the detecting of the symbols further comprises:
if the signal strength of the detected symbol is smaller than the predetermined threshold, comparing a signal strength of a detected next symbol corresponding to a next reception beam of the reception beam with the predetermined threshold.

6. A non-transitory computer-readable storage medium storing instructions that, when executed, cause at least one processor to perform the method of claim 1 .

7. A base station for receiving a signal in a wireless communication system, the base station comprising:
a transceiver configured to transmit a synchronization signal and control information for uplink transmission, and receive a random access signal through at least one transmission beam of a mobile station by switching a plurality of reception beams of the base station, the random access signal comprising a plurality of symbols corresponding to a number of the plurality of reception beams; and
a controller configured to:
detect a symbol corresponding to each of the plurality of reception beams from the plurality of symbols comprised in the random access signal, and
if a signal strength of the detected symbol is equal to or larger than a predetermined threshold, control the transceiver to transmit, to the mobile station, information related to a reception beam corresponding to the detected symbol among the plurality of reception beams.

8. The base station of claim 7 , wherein the random access signal is allocated to a total frequency band allocated to the wireless communication.

9. The base station of claim 7 ,
wherein the random access signal is allocated to one of subbands obtained by dividing a total frequency band, and
wherein other subbands are allocated to the respective subbands, the subbands to which the signal is not allocated are allocated to random access signals transmitted by other mobile stations.

10. The base station of claim 7 , wherein the controller is further configured to:
determine the reception beam as a best reception beam if the signal strength of the detected symbol is equal to or larger than the predetermined threshold.

11. The base station of claim 7 , wherein if the signal strength of the detected symbol is smaller than the predetermined threshold, the controller is further configured to compare a signal strength of a detected next symbol corresponding to a next reception beam of the reception beam with the threshold.

12. A method for transmitting a signal by a mobile station in a wireless communication system, the method comprising:
receiving, from a base station, a synchronization signal and control information for uplink transmission;
generating a random access signal based on the control information, the random access signal comprising a plurality of symbols corresponding to a number of a plurality of reception beams of the base station;
transmitting, to the base station, the random access signal through at least one transmission beam of the mobile station; and
receiving, from the base station, information related to a reception beam corresponding to a detected symbol among the plurality of reception beams, wherein a signal strength of the detected symbol is equal to or larger than a predetermined threshold.

13. The method of claim 12 , wherein the random access signal is allocated to a total frequency band allocated to the wireless communication.

14. The method of claim 12 , wherein the generating of the random access signal comprises:
inserting a guard interval between the plurality of symbols, taking into account a switching time between the plurality of reception beams at the base station.

15. A non-transitory computer-readable storage medium storing instructions that, when executed, cause at least one processor to perform the method of claim 12 .

16. The method of claim 12 ,
wherein the random access signal is allocated to one of subbands obtained by dividing a total frequency band, and
wherein other subbands are allocated to random access signals transmitted by other mobile stations.

17. A mobile station for transmitting a signal in a wireless communication system, the mobile station comprising:
a transceiver configured to receive, from a base station, a synchronization signal and control information for uplink transmission; and
a controller configured to:
generate a random access signal based on the control information, the random access signal comprising a plurality of symbols corresponding to a number of a plurality of reception beams of the base station, and
control the transceiver to transmit the random access signal to the base station through at least one transmission beam of the mobile station,

wherein the transceiver receives, from the base station, information related to a reception beam corresponding to a detected symbol among the plurality of reception beams, wherein a signal strength of the detected symbol is equal to or larger than a predetermined threshold.

18. The mobile station of claim 17 , wherein the random access signal is allocated to a total frequency band allocated to the wireless communication.

19. The mobile station of claim 17 , wherein the controller is further configured to insert a guard interval between the plurality of symbols, taking into account a switching time between the plurality of reception beams at the base station.

20. The mobile station of claim 17 ,
wherein the random access signal is allocated to one of subbands obtained by dividing a total frequency band, and
wherein other subbands are allocated to random access signals transmitted by other mobile stations.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Yung-Soo
• Yoo Hyun-Il

Classifications

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04B7/06952

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

• H04B7/18532

  Arrangements for managing transmission, i.e. for transporting data or a signalling message · CPC title

• H04B7/0695

  using beam selection · CPC title

• H04B7/088

  using beam selection · CPC title