Method for transmitting signal in multiple-antenna wireless communication system and apparatus for same

• US 10,171,147 B2
• Filed: 04/14/2015
• Issued: 01/01/2019
• Est. Priority Date: 04/14/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Youngtae, Kim, Kijun, Park, Jonghyun
• Primary Examiner(s): Beyen, Zewdu A
• Application Number:
  US15/304,046
• Publication Number:
  US 20170041057A1
• Time in Patent Office: 1,358 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/24 Reselection being triggered by specific parameters

Abstract

The present invention relates to a method and an apparatus for transmitting a signal of a first base station, for supporting a plurality of vertical directions in a wireless communication system which supports multiple antennas. Particularly, the method comprises the steps of: configuring a group so as to include at least one base station, among a plurality of base stations, for a first terminal having a position higher than those of the plurality of base stations; setting a specific sector for supporting coverage of the group; and determining whether to perform beamforming for the first terminal on the specific sector.

Claims

1. A method of transmitting a signal, the method performed by a first base station (BS) supporting a plurality of vertical beam directions in a wireless communication system that supports multiple antennas and comprising:

configuring a group of a plurality of BSs including the first BS for a user equipment (UE) at a location higher than locations of the plurality of BSs;

setting a sector for supporting coverage of the group;

determining whether to perform beamforming on the set sector for the UE;

transmitting information to other of the plurality of BSs included in the group, the information indicating that the first BS will perform beamforming for the UE when it is determined to perform the beamforming for the UE; and

transmitting the signal through the BS transmitting the information to other BSs of the plurality of BSs to the UE in an upward beam direction of the plurality of BSs.

2. The method of claim 1, wherein the signal is transmitted until the other of the plurality of BSs indicate that they will perform the beamforming for the UE.

3. The method of claim 1, further comprising receiving a handover request of the UE from one of the other of the plurality of BSs.

4. The method of claim 1, wherein it is determined to perform the beamforming when an amount traffic received from the other of the plurality of BSs is smaller than an amount of traffic of the first BS.

5. The method of claim 4, wherein the set sector corresponds to a vertical sector determined according to the amount of traffic of the first BS and the amount of traffic received from the other of the plurality of BSs.

6. The method of claim 1, wherein the first BS and the other of the plurality of BSs are configured to have a cell-specific reference signal of an identical identifier.

7. The method of claim 1, wherein determining whether to perform the beamforming is periodically performed according to a predetermined period.

8. A first base station (BS) supporting a plurality of vertical beam directions in a wireless communication system that supports multiple antennas, the BS comprising:

a radio frequency (RF) unit configured to transmit and receive signals; and

a processor configured to;

configure a group of a plurality of BSs including the first BS for a user equipment (UE) at a location higher than locations of the plurality of BSs;

set a sector for supporting coverage of the group;

determine whether to perform beamforming on the set sector for the UE;

control the RF unit to transmit information to other of the plurality of BSs included in the group, the information indicating that the first BS will perform beamforming for the UE when it is determined to perform the beamforming for the UE; and

control the RF unit to transmit a signal through the BS transmitting the information to other BSs to the UE in an upward beam direction of the plurality of BSs.

9. The BS of claim 8, wherein the signal is transmitted until the other of the plurality of BSs indicate that they will perform the beamforming for the UE.

10. The BS of claim 8, wherein the processor is further configured to control the RF unit to receive a handover request of the UE from one of the other of the plurality of BSs.

11. The BS of claim 8, wherein it is determined to perform the beamforming when an amount traffic received from the other of the plurality of BSs is smaller than an amount traffic of the first BS.

12. The BS of claim 11, wherein the set sector corresponds to a vertical sector determined according to the amount of traffic of the first BS and the amount of traffic received from the other of the plurality of BSs.

13. The BS of claim 8, wherein the first BS and the other of the plurality of BSs are configured to have a cell-specific reference signal of an identical identifier.

14. The BS of claim 8, wherein determining whether to perform the beamforming is periodically performed according to a predetermined period.