Method for transmitting reference signal to antenna port in wireless access system

Patent metadata

Field	Value
Publication number	US-9520973-B2
Application number	US-201314414064-A
Country	US
Kind code	B2
Filing date	Jul 12, 2013
Priority date	Jul 12, 2012
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

The present invention provides various methods for transmitting a channel state information reference signal (CSI-RS) by varying a transmission period for each antenna port or antenna port group, and also provides apparatuses supporting the methods. The method for receiving a CSI-RS in a wireless access system according to one aspect of the present invention may comprise the steps of: receiving a CSI-RS component information element for setting CSI-RS transmission periods for two or more antenna ports to be mutually different; receiving CSI-RSs for each of the two or more antenna ports based on the CSI-RS component information element; and acquiring channel state information for each of the two or more antenna ports based on the received CSI-RS.

First claim

What is claimed is:

1. A method for receiving a channel state information reference signal (CSI-RS) in a wireless access system, the method comprising:
receiving a CSI-RS configuration information element to be used for 3 dimensional beamforming, wherein the CSI-RS configuration information element includes antenna set number parameters indicating antenna port groups and CSI-RS subframe configuration parameters indicating different transmission periods of the CSI-RS for each of the antenna port groups;
receiving the CSI-RS for the each of the antenna port groups based on the CSI-RS configuration information element; and
obtaining a channel state information for the each of the antenna port groups based on the received CSI-RS for the each of the antenna port groups,
wherein the each of the antenna port groups has grouped for vertical beamforming and horizontal beamforming of the 3 dimensional beamforming, and
wherein the each of the antenna port groups includes two or more antennas.

2. The method of claim 1 , wherein the CSI-RS configuration information element is received via a higher layer signal.

3. The method of claim 1 , further comprising: reporting the channel state information to a base station.

4. A user equipment (UE) for receiving a channel state information reference signal (CSI-RS) in a wireless access system, the UE comprising:
a transceiver; and
a processor configured to control the CSI-RS reception, the processor configured to receive a CSI-RS configuration information element to be used for 3 dimensional beamforming to receive the CSI-RS for each of antenna port groups based on the CSI-RS configuration information element, and to obtain a channel state information for the each of the antenna port groups based on the received CSI-RS, using the transceiver,
wherein the CSI-RS configuration information element includes antenna set number parameters indicating the each of the antenna port groups and CSI-RS subframe configuration parameters indicating different transmission periods of the CSI-RS for the each of the antenna port groups,
wherein the each of the antenna port groups has grouped for vertical beamforming and horizontal beamforming of the 3 dimensional beamforming, and
wherein the each of the antenna port groups includes two or more antennas.

5. The user equipment of claim 4 , wherein the CSI-RS configuration information element is received via a higher layer signal.

6. The user equipment of claim 4 , wherein the processor is configured to report the channel state information to a base station using the transceiver.

7. Method for transmitting a channel state information reference signal (CSI-RS) in a wireless access system, the method comprising:
transmitting a CSI-RS configuration information element to be used for 3 dimensional beamforming, wherein the CSI-RS configuration information element includes antenna set number parameters indicating antenna port groups and CSI-RS subframe configuration parameters indicating different transmission periods of the CSI-RS for each of the antenna port groups; and
transmitting the CSI-RS for the each of the antenna port groups based on the CSI-RS configuration information element;
wherein the each of the antenna port groups has grouped for vertical beamforming and horizontal beamforming of the 3 dimensional beamforming, and
wherein the each of the antenna port groups includes two or more antennas.

8. The method of claim 7 , wherein the CSI-RS configuration information element is received via a higher layer signal.

9. The method of claim 7 , further comprising:
receiving a report including channel state information for the each of the antenna port groups obtained based on the CSI-RS.

10. An evolved Node B (eNB) for transmitting a channel state information reference signal (CSI-RS) in a wireless access system, the eNB comprising:
a transceiver; and
a processor configured to control the CSI-RS transmission, the processor configured to transmit a CSI-RS configuration information element to be used for 3 dimensional beamforming, to transmit the CSI-RS for each of antenna port groups based on the CSI-RS configuration information element,
wherein the CSI-RS configuration information element includes antenna set number parameters indicating the each of the antenna port groups and CSI-RS subframe configuration parameters indicating different transmission periods of the CSI-RS for the each of the antenna port groups,
wherein the each of the antenna port groups has grouped for vertical beamforming and horizontal beamforming of the 3 dimensional beamforming, and
wherein the each of the antenna port groups includes two or more antennas.

11. The eNB of claim 10 , wherein the CSI-RS configuration information element is transmitted via a higher layer signal.

12. The eNB of claim 10 , wherein the processor is configured to receive a report including channel state information for the each of antenna port groups obtained based on the CSI-RS.

Assignees

• Lg Electronics Inc

Inventors

• Kim Jinmin
• Ko Hyunsoo
• Chung Jaehoon

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04W72/0413

  Electricity · mapped topic

• H04B7/0891

  Space-time diversity (rake receivers H04B1/7115; space-time decoding H04L1/0631) · CPC title

• H04B7/0671

  using different delays between antennas · CPC title