Apparatus and method for allocating channel state information-reference signal in wireless communication system

Patent metadata

Field	Value
Publication number	US-9344245-B2
Application number	US-201414299679-A
Country	US
Kind code	B2
Filing date	Jun 9, 2014
Priority date	Jun 1, 2010
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

Embodiments of the present invention relate to a wireless communication system, and more particularly, to a technology for allocating a Channel State Information-Reference Signal (CSI-RS) in a wireless communication system. Embodiments of the present invention provides an apparatus and method for allocating CSI-RSs to resource areas, in which, under the condition of a subframe in which the CP is an extended CP, and the duplex scheme is TDD, if CSI-RSs for maximum 8 antenna ports are allocated, the CSI-RSs are allocated to the 8th and 9th symbols (symbol No. l=7 and 8), wherein each CSI-RS for every two antenna ports is allocated to the same RE while being discriminated from each other by an orthogonal code and neighbor CSI-RS allocated REs in the frequency axis are spaced by an interval of three REs.

First claim

What is claimed is:

1. A method for an apparatus comprising a processor for allocating Channel State Information-Reference Signals (CSI-RSs) for at lease two antenna ports in a wireless communication system that supports an extended Cyclic Prefix (CP) and a Time Division Duplex (TDD) mode, the method comprising:
allocating, by the processor, CSI-RSs of a first pair of antenna ports to a first two consecutive Resource Elements (REs) in a time-frequency resource area determined by one subframe and 12 subcarriers, the first two consecutive REs corresponding to one subcarrier in a frequency axis and 8th and 9th symbols in a time axis, and the one subframe having 12 symbols for the extended CP,
wherein a CSI-RS of a first antenna port and a CSI-RS of a second antenna port in the first pair of antenna ports are configured to be discriminated from each other by orthogonal codes.

2. The method of claim 1 , further comprising:
allocating, by the processor, CSI-RSs of a second pair of antenna ports to a second two consecutive REs in the time-frequency resource area,
wherein the first two consecutive REs and the second two consecutive REs are spaced apart from each other along the frequency axis by having two subcarriers between the first two consecutive REs and the second two consecutive REs.

3. The method of claim 1 , wherein CSI-RSs of the (7th, 8th), (5th, 6th), (3rd, 4th), (1st, 2nd) antenna ports are allocated to two consecutive REs having subcarrier indexes having 0, 3, 6, and 9 (1st, 4th, 7th and 10th subcarriers within a Resource Block, respectively), respectively.

4. The method of claim 1 , wherein the first antenna port and the second antenna port in the first pair of antenna ports have consecutive antenna port numbers.

5. The method of claim 1 , wherein the orthogonal codes include two orthogonal cover codes (OCCs),
wherein a first OCC has a value of 1 mapped to the 8th symbol and a value of 1 mapped to the 9th symbol, and a second OCC has a value of 1 mapped to the 8th symbol and a value of −1 mapped to the 9th symbol.

6. A method for an apparatus comprising a signal receiver to receive Channel State Information-Reference Signals (CSI-RSs), the method comprising:
receiving, by the signal receiver, an Orthogonal Frequency Division Multiplexing (OFDM) signal, which is generated through allocation of CSI-RSs for at least two antenna ports in a wireless communication system that supports an extended Cyclic Prefix (CP) and a Time Division Duplex (TDD) mode;
extracting CSI-RSs for antenna ports allocated to particular Resource Elements (REs) from the received signal; and
acquiring Channel State Information (CSI) based on the extracted CSI-RSs,
wherein CSI-RSs of a first pair of antenna ports are allocated to a first two consecutive REs in a time-frequency resource area determined by one subframe and 12 subcarriers, the first two consecutive REs corresponding to one subcarrier in a frequency axis and 8th and 9th symbols in a time axis, and the one subframe having 12 symbols for the extended CP, and
a CSI-RS of a first antenna port and a CSI-RS for a second antenna port in the first pair of antenna ports are configured to be discriminated from each other by orthogonal codes.

7. The method of claim 6 , wherein CSI-RSs of a second pair of antenna ports are allocated to a second two consecutive REs in the time-frequency resource area,
wherein the first two consecutive REs and the second two consecutive REs are spaced apart from each other along the frequency axis by having two subcarriers between the first two consecutive REs and the second two consecutive REs.

8. The method of claim 6 , wherein CSI-RSs of the (7th, 8th), (5th, 6th), (3rd, 4th), (1st, 2nd) antenna ports are allocated to two consecutive REs having subcarrier indexes having 0, 3, 6, and 9 (1st, 4th, 7th and 10th subcarriers within a Resource Block, respectively), respectively.

9. The method of claim 6 , wherein the first antenna port and the second antenna port in the first pair of antenna ports have consecutive antenna port numbers.

10. The method of claim 6 , wherein the orthogonal codes include two orthogonal cover codes (OCCs),
wherein a first OCC has a value of 1 mapped to the 8th symbol and a value of 1 mapped to the 9th symbol, and a second OCC has a value of 1 mapped to the 8th symbol and a value of −1 mapped to the 9th symbol.

11. An apparatus, comprising:
a processor configured to allocate Channel State Information-Reference Signals (CSI-RSs) for at least two antenna ports in a wireless communication system that supports an extended Cyclic Prefix (CP) and a Time Division Duplex (TDD) mode,
wherein CSI-RSs of a first pair of antenna ports are allocated to a first two consecutive Resource Elements (REs) in a time-frequency resource area determined by one subframe and 12 subcarriers, the first two consecutive REs corresponding to one subcarrier in a frequency axis and 8th and 9th symbols in a time axis, and the one subframe having 12 symbols for the extended CP, and
a CSI-RS of a first antenna port and a CSI-RS of a second antenna port in the first pair of antenna ports are configured to be discriminated from each other by different orthogonal codes.

12. The apparatus of claim 11 ,
wherein the processor allocates CSI-RSs of a second pair of antenna ports to a second two consecutive REs in the time-frequency resource area, and
wherein the first two consecutive REs and the second two consecutive REs are spaced apart from each other along the frequency axis by having two subcarriers between the first two consecutive REs and the second two consecutive REs.

13. The apparatus of claim 11 , wherein CSI-RSs of the (7th, 8th), (5th, 6th), (3rd, 4th), (1st, 2nd) antenna ports are allocated to two consecutive REs having subcarrier indexes having 0, 3, 6, and 9 (1st, 4th, 7th and 10th subcarriers within a Resource Block, respectively), respectively.

14. The apparatus of claim 11 , wherein the first antenna port and the second antenna port in the first pair of antenna ports have consecutive antenna port numbers.

15. The apparatus of claim 11 , wherein the orthogonal codes include two orthogonal cover codes (OCCs),
wherein a first OCC has a value of 1 mapped to the 8th symbol and a value of 1 mapped to the 9th symbol, and a second OCC has a value of 1 mapped to the 8th symbol and a value of −1 mapped to the 9th symbol.

16. An apparatus to receive Channel State Information-Reference Signals (CSI-RSs), the apparatus comprising:
a signal receiver to receive an Orthogonal Frequency Division Multiplexing (OFDM) signal, which is generated through allocation of CSI-RSs for at least two antenna ports in a wireless communication system that supports an extended Cyclic Prefix (CP) and a Time Division Duplex (TDD) mode;
a CSI-RS extractor to extract CSI-RSs for antenna ports allocated to particular Resource Elements (REs) from a signal received by the signal receiver; and
a channel state measurer to acquire Channel State Information (CSI) based on the extracted CSI-RSs,
wherein CSI-RSs of a first pair of antenna ports are allocated to a first two consecutive REs in a time-frequency resource area determined by one subframe and 12 subcarriers, the first two consecutive REs corresponding to one subcarrier in a frequency axis and 8th and 9th symbols in a time axis, and the one subframe having 12 symbols for the extended CP, and
a CSI-RS of a first antenna port and a CSI-RS for a second antenna port in the first pair of antenna ports are discriminated from each other by orthogonal codes.

17. The apparatus of claim 16 ,

Assignees

• Pantech Co Ltd

Inventors

• Yoon Sungjun
• Park Kyoung-Min
• Kim Kitae

Classifications

• H04L5/0007 Primary

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0039

  Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another · CPC title

• H04L5/005 Primary

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04L2025/03802

  Signalling on the reverse channel · CPC title