METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN MULTIPLE ANTENNA SUPPORTING WIRELESS COMMUNICATION SYSTEM

• US 20160204921A1
• Filed: 09/05/2014
• Published: 07/14/2016
• Est. Priority Date: 09/05/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Youngtae, YANG, Suckchel, SEO, Hanbyul, KIM, Kijun, PARK, Jonghyun, CHAE, Hyukjin, SEO, Inkwon
• Granted Patent: US 10,090,986 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0479 for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

The present invention discloses a method and an apparatus for transmitting a reference signal in a wireless communication system. More specifically, the method comprises configuring a first antenna group on the basis of a plurality of antenna elements configured by a horizontal domain antenna element and a vertical domain antenna element; transmitting a configuration with regard to a specific sub frame to first terminals through a first antenna group; receiving a sounding reference signal (SRS) through the specific sub frame from the first terminals; selecting at least one second terminal among the first terminals on the basis of the sounding reference signal; and transmitting a channel state information-reference signal (CSI-RS) with respect to the at least one second terminal, wherein the specific sub frame is characterized in that at least a part of a source area is configured by a multicast broadcast single frequency network (MBSFN) sub frame.

Claims

1. A method of transmitting a reference signal by a transmitting end in a wireless communication system supporting multiple antennas, the method comprising the steps of:

configuring a 1^st antenna group on the basis of a plurality of antenna elements including horizontal domain antenna elements and vertical domain antenna elements;

transmitting a configuration for a specific subframe to 1^st user equipments through the 1^st antenna group;

receiving an SRS (sounding reference signal) through the specific subframe from the 1^st user equipments;

selecting at least one 2^nd user equipment from the 1^st user equipments on the basis of the SRS; and

transmitting a CSI-RS (channel state information-reference signal) to the at least one 2^nd user equipment,

wherein at least a portion of a resource region in the specific subframe is configured as an MBSFN (multicast broadcast single frequency network) subframe.

2. The method of claim 1, wherein the SRS is transmitted through a specific resource region, which is configured as the MBSFN subframe, in the specific subframe.

3. The method of claim 2, wherein the specific resource region corresponds to a specific frequency band and wherein the specific resource region is configured different for each of the 1^st user equipments.

4. The method of claim 2, wherein the specific resource region comprises at least one symbol having an index greater than a pre-defined symbol index.

5. The method of claim 2, wherein the specific resource region is configured through high layer signaling.

6. The method of claim 1, wherein the at least one 2nd user equipment is selected from the 1^st user equipments with reference to a beam direction measured based on the SRS.

7. The method of claim 1, wherein the configuration for the specific subframe is announced to at least one neighbor cell.

8. The method of claim 1, wherein if the SRS and a periodic uplink signal are simultaneously transmitted in the specific subframe, while a sum of transmission power for the SRS and transmission power for the periodic uplink signal exceeds maximum power configured for the specific subframe, the transmission power for the periodic uplink signal is reduced.

9. The method of claim 1, wherein if the SRS and a periodic uplink signal are not simultaneously transmitted in the specific subframe, the periodic uplink signal configured in the specific subframe is dropped.

10. The method of claim 1, wherein if the SRS and an aperiodic uplink signal are simultaneously transmitted in the specific subframe, while a sum of transmission power for the SRS and transmission power for the aperiodic uplink signal exceeds maximum power configured for the specific subframe, the transmission power for the SRS is reduced.

11. The method of claim 1, wherein if the SRS and an aperiodic uplink signal are not simultaneously transmitted in the specific subframe, the SRS configured in the specific subframe is dropped.

12. The method of claim 1, wherein the SRS is transmitted by applying uplink timing alignment.

13. The method of claim 1, wherein the SRS is transmitted according to power control of an uplink SRS.

14. A base station configured to transmit a reference signal in a wireless communication system supporting multiple antennas, comprising:

a radio frequency unit; and

a processor,

wherein the processor is configured to form a 1^st antenna group on the basis of a plurality of antenna elements including horizontal domain antenna elements and vertical domain antenna elements, to transmit a configuration for a specific subframe to 1^st user equipments through the 1^st antenna group, to receive an SRS (sounding reference signal) through the specific subframe from the 1^st user equipments, to select at least one 2^nd user equipment from the 1^st user equipments on the basis of the SRS, and to transmit a CSI-RS (channel state information-reference signal) to the at least one 2^nd user equipment and

wherein at least a portion of a resource region in the specific subframe is configured as an MBSFN (multicast broadcast single frequency network) subframe.