METHOD IN WHICH USER EQUIPMENT TRANSMITS A SIGNAL IN A DISTRIBUTED ANTENNA SYSTEM, AND USER EQUIPMENT USING SAME

• US 20130053050A1
• Filed: 03/23/2011
• Published: 02/28/2013
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kang, Ji Won, Chun, Jin Young, Kim, Su Nam, Ihm, Bin Chul, Park, Sung Ho
• Granted Patent: US 8,989,655 B2
• Time in Patent Office: Days
• US Class Current: 455/452.1
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method in which user equipment transmits a signal in a distributed antenna system in which a plurality of antennas is distributed in a cell, comprises the following steps: receiving uplink antenna information from a base station; controlling uplink power on the basis of the uplink antenna information; and transmitting an uplink signal on the basis of the uplink power control, wherein the uplink antenna information indicates a receiving antenna of the base station that receives the uplink signal.

Claims

1. A method for transmitting a signal by a user equipment(UE) in a distributed antenna system (DAS) in which a plurality of antennas are distributedly disposed in a cell, the method comprising:

receiving uplink antenna information from a base station (BS);

controlling uplink power based on the uplink antenna information; and

transmitting an uplink signal based on the uplink power control,

wherein the uplink antenna information indicates a reception antenna of the BS for receiving the uplink signal.

2. The method of claim 1, further comprising:

receiving downlink antenna information from the BS; and

generating downlink channel state information based on the downlink antenna information,

wherein the downlink antenna information indicates a transmission antenna through which the BS transmits a downlink signal to the UE.

3. The method of claim 2, wherein the uplink antenna information indicates an antenna indicated by the downlink antenna information and at least one additional antenna.

4. The method of claim 3, wherein the uplink antenna information includes only an antenna index of the at least one additional antenna.

5. The method of claim 2, wherein the uplink signal includes the downlink channel state information.

6. The method of claim 2, wherein the downlink antenna information indicates an antenna indicated by the uplink antenna information and at least one additional antenna.

7. The method of claim 6, wherein the downlink antenna information includes only an antenna index of the at least one additional antenna.

8. The method of claim 1, wherein the UE adjusts uplink transmission power by using an average of path losses with respect to reception antennas indicated by the uplink antenna information.

9. The method of claim 1, wherein the uplink antenna information includes an antenna index of the reception antenna.

10. The method of claim 1, wherein the uplink antenna information includes an index of a reference signal transmitted through the reception antenna.

11. A method for transmitting a signal by a user equipment (UE) in a distributed antenna system (DAS) in which a plurality of antennas are distributedly disposed in a cell, the method comprising:

receiving a downlink reference signal from a base station (BS);

selecting a preferred antenna group by using the downlink reference signal;

feeding back information regarding the preferred antenna group to the BS;

receiving downlink antenna information from the BS;

controlling uplink power on the assumption that the preferred antenna group is a reception antenna of the BS; and

transmitting an uplink signal to the BS,

wherein the uplink signal is transmitted to an antenna included in the preferred antenna group.

12. A user equipment(UE) comprising:

an radio frequency (RF) unit configured to transmit and receive an RF signal; and

a processor connected to the RF unit,

wherein the processor receives uplink antenna information from a base station (BS), controls uplink power based on the uplink antenna information, and transmits an uplink signal based on the controlled power,

wherein the uplink antenna information indicates a reception antenna of the BS for receiving the uplink signal.

13. The UE of claim 12, wherein the processor further receives downlink antenna information from the BS and generate downlink channel state information based on the downlink antenna information,

wherein the downlink antenna information indicates a transmission antenna through which the BS transmits a downlink signal.