Apparatus and method for transmitting a reference signal in a wireless communication system

• US 9,106,395 B2
• Filed: 04/22/2010
• Issued: 08/11/2015
• Est. Priority Date: 04/22/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Moon Il, Koo, Ja Ho, Chung, Jae Hoon, Ihm, Bin Chul, Ko, Hyun Soo
• Primary Examiner(s): DUONG, CHRISTINE T
• Application Number:
  US13/265,794
• Publication Number:
  US 20120039298A1
• Time in Patent Office: 1,937 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0465 taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
• CPC Class Codes: H04B 7/066 Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
• CPC Class Codes: H04L 1/0079 Formats for control data H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal

Abstract

A method of transmitting a reference signal by a base station in a wireless communication system is provided. The method includes: generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are different types; and transmitting the plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are transmitted using one or more subframes as a duty cycle.

Claims

1. A method of transmitting reference signals by a base station via a downlink channel including a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) in a wireless communication system, the method comprising:

generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement include first type channel state information reference signals (CSI-RSs) and second type CSI-RSs;

determining a first duty cycle for the first type CSI-RSs and a second duty cycle for the second type CSI-RSs, wherein the first duty cycle and the second duty cycle are separately configured, wherein each of the first duty cycle and the second duty cycle is set to one of available duty cycle values including 5 ms, 10 ms, 20 ms, or 40 ms, and

if a resource allocated for at least one of the first type CSI-RSs overlaps with a resource allocated for at least one of the second type CSI-RSs, transmitting the at least one of the first type CSI-RSs, and not transmitting the at least one of the second type CSI-RSs.

2. The method of claim 1, wherein a first reference signal pattern is applied to the first type CSI-RSs and a second reference signal pattern is applied to the second type CSI-RSs.

3. The method of claim 2, wherein the second reference signal pattern of the second type CSI-RSs has a format in which the first reference signal pattern of the first type CSI-RSs is shifted along a time axis or a frequency axis.