APPARATUS AND METHOD FOR TRANSMITTING A REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM

• US 20150304076A1
• Filed: 06/26/2015
• Published: 10/22/2015
• 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, Jaho, CHUNG, Jae Hoon, IHM, Bin Chul, KO, Hyunsoo
• Granted Patent: US 10,218,481 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 23/00 Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/542 using measured or perceived quality

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; and

transmitting the first type CSI-RSs based on a first duty cycle and a first offset and the second type CSI-RSs based on a second duty cycle and a second offset, 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, wherein the first offset and the second offset are separately configured.

2. The method of claim 1, wherein the first type CSI-RSs are associated with a first number of transmit antennas and the second type CSI-RS are associated with a second number of transmit antennas.

3. The method of claim 1, wherein information indicating the first duty cycle and the second duty cycle is transmitted via radio resource control (RRC) signaling.

4. The method of claim 1, wherein, the second type CSI-RSs are transmitted by being shifted by an offset value from a point at which the first CSI-RSs are transmitted.

5. The method of claim 1, further comprising transmitting a reference signal for demodulation, wherein the reference signal for demodulation is transmitted in every subframe.

6. The method of claim 1, wherein each of the at least one duty cycle is corresponding to one or more subframe.

7. 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.

8. The method of claim 7, 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.

9. The method of claim 1, wherein if the base station transmits the reference signal for channel measurement by using multiple carriers, types of the plurality of reference signals for channel measurement are determined for the respective carriers.

10. An apparatus for transmitting reference signals via a downlink channel including a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH), the apparatus comprising:

N antennas; and

a processor coupled to the N antennas and configured for;

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; and

transmitting the first type CSI-RSs based on a first duty cycle and a first offset and the second type CSI-RSs based on a second duty cycle and a second offset, 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, and 40 ms, wherein the first offset and the second offset are separately configured.

11. The apparatus of claim 10, 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.

12. The apparatus of claim 11, 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.