Method and apparatus for generating an uplink reference signal sequence in a wireless communication system

• US 8,804,647 B2
• Filed: 01/07/2011
• Issued: 08/12/2014
• Est. Priority Date: 01/07/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyun Soo, Noh, Min Seok, Chung, Jae Hoon, Han, Seung Hee, Lee, Moon Il
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): Ganguly, Sumitra
• Application Number:
  US13/521,017
• Publication Number:
  US 20130121266A1
• Time in Patent Office: 1,313 Days
• Field of Search: 370/312, 370/329, 370/335, 370/278, 370/208, 370/340, 370/334, 370/203, 370/330, 455/450
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04J 13/0062 Zadoff-Chu
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04J 2211/005 Long term evolution [LTE]
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 5/0012 Hopping in multicarrier systems for frequency hopping in spread spectrum systems H04B1/713
• CPC Class Codes: H04L 5/0026 Division using four or more dimensions
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

The present invention provides a method and apparatus for generating a reference signal sequence by user equipment (UE) in a wireless communication system. The UE receives a UE-specific sequence group hopping (SGH) parameter that is specific to itself, and generates a reference signal sequence based on a base sequence in each slot unit. The base sequence is classified into sequence-group numbers determined in each of the slot units by the UE-specific SGH parameter indicating whether SGH has been carried out, and base sequence numbers.

Claims

1. A method of generating, by a user equipment (UE), a reference signal sequence in a wireless communication system, the method comprising:

receiving a cell-specific sequence group hopping (SGH) parameter from a base station, the cell-specific SGH parameter is used to enable a sequence group hopping for a plurality of UEs in a cell;

receiving a UE-specific SGH parameter, specified to the UE, from the base station, the UE-specific SGH parameter is used to disable the sequence group hopping, enabled by the cell-specific SGH parameter, for the UE; and

generating the reference signal sequence based on a base sequence and a sequence group number, wherein the sequence group number is determined by the UE-specific SGH parameter.

2. The method of claim 1, wherein the UE-specific SGH parameter is received through a higher layer.

3. The method of claim 1, wherein the cell-specific SGH parameter is received through a higher layer.

4. The method of claim 1, wherein the sequence group number in each slot is identical with each other.

5. The method of claim 4, wherein the sequence group number in each slot is identical with each other in one subframe.

6. The method of claim 4, wherein the sequence group number in each slot is identical with each other in all subframes within a frame.

7. The method of claim 1, wherein the sequence group number in each slot is determined by Equation below:

u=(f_gh(n_s)+f_ss)mod30

where n_s denotes a slot number in a frame, f_ss denotes a sequence shift pattern configured by a cell identifier (ID) and a higher layer, and f_gh(n_s) is 0 by the UE-specific SGH parameter.

8. A user equipment (UE) for generating a reference signal sequence in a wireless communication system, the user equipment comprising:

a radio frequency (RF) unit for transmitting or receiving a radio signal; and

a processor, operatively coupled to the RF unit, and configured for;

receiving a cell-specific sequence group hopping (SGH) parameter from a base station, the cell-specific SGH parameter is used to enable a sequence group hopping for a plurality of UEs in a cell;

receiving a UE-specific SGH parameter, specified to the UE, from the base station, the UE-specific SGH parameter is used to disable the sequence group hopping, enabled by the cell-specific SGH parameter, for the UE; and

generating the reference signal sequence based on a base sequence and a sequence group number, wherein the sequence group number is determined by the UE-specific SGH parameter.

9. The user equipment of claim 8, wherein the UE-specific SGH parameter is received through a higher layer.

10. The user equipment of claim 8, wherein the cell-specific SGH parameter is received through a higher layer.

11. The user equipment of claim 8, wherein the sequence group number in each slot is identical with each other.

12. The user equipment of claim 11, wherein the sequence group number in each slot in one subframe is identical with each other.

13. The user equipment of claim 11, wherein the sequence group number in each slot in all subframes within a frame is identical with each other.

14. The user equipment of claim 8, wherein the sequence group number in each slot is determined by Equation below:

u=(f_gh(n_s)+f_ss)mod30,

where n_s denotes a slot number in a frame, f_ss denotes a sequence shift pattern configured by a cell identifier (ID) and a higher layer, and f_gh(n_s) is 0 by the UE-specific SGH parameter.