Method and apparatus for transmitting reference signal

• US 8,743,807 B2
• Filed: 04/15/2010
• Issued: 06/03/2014
• Est. Priority Date: 04/15/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chung, Jae Hoon, Ko, Hyun Soo, Lee, Moon Il, Kwon, Yeong Hyeon
• Primary Examiner(s): CHAN, SAI MING
• Application Number:
  US13/264,738
• Publication Number:
  US 20120033630A1
• Time in Patent Office: 1,510 Days
• Field of Search: 370/329, 370/339
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0473 taking constraints in layer or codeword to antenna mapping into account
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/0684 using different training sequences per antenna
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 27/2653 with direct demodulation of individual subcarriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 40/244 using a network of reference devices, e.g. beaconing
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention relates to a wireless communication system, and more specifically, to a method and an apparatus for transmitting an RS (Reference Signal) from a transmission end. The present invention relates to an RS transmission method and an apparatus therefore, comprising the steps of: confirming RS resources which are defined according to each layer; and transmitting the precoded RS for the layers to a receiving end through a multiple antenna, wherein the RS resource includes a 1^st index for indicating an RS resource pattern group in which the precoded RS is mapped within a resource block and a 2^nd index for indicating a code resource for multiplexing the precoded RSs within the RS resource pattern group.

Claims

1. A method of mapping signals in a wireless communication system, the method comprising:

mapping first reference signals for each antenna port of a first set of antenna ports to a first group of resource elements in one or more resource blocks; and

mapping second reference signals for each antenna port of a second set of antenna ports to a second group of resource elements in the one or more resource blocks,

wherein orthogonal sequences are multiplied with the first reference signals or the second reference signals, and

wherein the first set of antenna ports comprises antenna ports {N, N+1, N+4, N+6} and the second set of antenna ports comprises antenna ports {N+2, N+3, N+5, N+7}.

2. The method of claim 1, wherein the first group of resource elements or the second group of resource elements in one resource block comprise three pairs of resource elements, two resource elements in each pair are contiguous in a time domain, and two neighboring pairs of resource elements are separated by 5 subcarriers in a frequency domain.

3. The method of claim 1, wherein the first group of resource elements or the second group of resource elements shows a pattern as shown in the Table below:

4. The method of claim 1, wherein the orthogonal sequences are multiplied with the first or second reference signals in units of two or four neighboring resource elements with the same subcarrier index.

5. The method of claim 1, wherein the one or more resource blocks are used for a Physical Downlink Shared Channel (PDSCH).

6. A method of receiving reference signals in a wireless communication system, the method comprising:

receiving first reference signals for each antenna port of a first set of antenna ports, wherein the first reference signals are mapped to a first group of resource elements in one or more resource blocks; and

receiving second reference signals for each antenna port of a second set of antenna ports, wherein the second reference signals are mapped to a second group of resource elements in the one or more resource blocks,

wherein orthogonal sequences are multiplied with the first reference signals or the second reference signals, and

wherein the first set of antenna ports comprises antenna ports {N, N+1, N+4, N+6} and the second set of antenna ports comprises antenna ports {N+2, N+3, N+5, N+7}.

7. The method of claim 6, wherein the first group of resource elements or the second group of resource elements in one resource block comprise three pairs of resource elements, two resource elements in each pair are contiguous in a time domain, and two neighboring pairs of resource elements are separated by 5 subcarriers in a frequency domain.

8. The method of claim 6, wherein the first group of resource elements or the second group of resource elements shows a pattern as shown in the Table below:

9. The method of claim 6, wherein the orthogonal sequences are multiplied with the first or second reference signals in units of two or four neighboring resource elements with the same subcarrier index.

10. The method of claim 6, wherein the one or more resource blocks are used for a Physical Downlink Shared Channel (PDSCH).

11. The method of claim 10, further comprising:

demodulating the PDSCH using the first or second reference signals.

12. A communication apparatus used in a wireless communication system, the communication apparatus comprising:

a Radio Frequency (RF) unit; and

a processor,

wherein the processor is configured to map first reference signals for each antenna port of a first set of antenna ports to a first group of resource elements in one or more resource blocks, and to map second reference signals for each antenna port of a second set of antenna ports to a second group of resource elements in the one or more resource blocks,

wherein orthogonal sequences are multiplied with the first reference signals or second reference signals, and

wherein the first set of antenna ports comprises antenna ports {N, N+1, N+4, N+6} and the second set of antenna ports comprises antenna ports {N+2, N+3, N+5, N+7}.

13. The communication apparatus of claim 12, wherein the first group of resource elements or the second group of resource elements in one resource block comprise three pairs of resource elements, two resource elements in each pair are contiguous in a time domain, and two neighboring pairs of resource elements are separated by 5 subcarriers in a frequency domain.

14. The communication apparatus of claim 12, wherein the first group of resource elements or the second group of resource elements shows a pattern as shown in the Table below:

15. The communication apparatus of claim 12, wherein the orthogonal sequences are multiplied with the first or second reference signals in units of two or four neighboring resource elements with the same subcarrier index.

16. The communication apparatus of claim 12, wherein the one or more resource blocks are used for a Physical Downlink Shared Channel (PDSCH).

17. A communication apparatus used in a wireless communication system, the communication apparatus comprising:

a Radio Frequency (RF) unit; and

a processor,

wherein the processor is configured to receive first reference signals for each antenna port of a first set of antenna ports, wherein the first reference signals are mapped to a first group of resource elements in one or more resource blocks, and to receive second reference signals for each antenna port of a second set of antenna ports, wherein the second reference signals are mapped to a second group of resource elements in the one or more resource blocks,

wherein orthogonal sequences are multiplied with the first reference signals or the second reference signals, and

wherein the first set of antenna ports comprises antenna ports {N, N+1, N+4, N+6} and the second set of antenna ports comprises antenna ports {N+2, N+3, N+5, N+7}.

18. The communication apparatus of claim 17, wherein the first group of resource elements or the second group of resource elements in one resource block comprise three pairs of resource elements, two resource elements in each pair are contiguous in a time domain, and two neighboring pairs of resource elements are separated by 5 subcarriers in a frequency domain.

19. The communication apparatus of claim 17, wherein the first group of resource elements or the second group of resource elements shows a pattern as shown in the Table below:

20. The communication apparatus of claim 17, wherein the orthogonal sequences are multiplied with the first or second reference signals in units of two or four neighboring resource elements with the same subcarrier index.

21. The communication apparatus of claim 17, wherein the one or more resource blocks are used for a Physical Downlink Shared Channel (PDSCH).

22. The communication apparatus of claim 21, wherein the processor is further configured to demodulate the PDSCH using the first or second reference signals.