METHOD AND APPARATUS FOR GENERATING A REFERENCE SIGNAL SEQUENCE IN A WIRELESS COMMUNICATION SYSTEM

• US 20130201931A1
• Filed: 05/13/2011
• Published: 08/08/2013
• Est. Priority Date: 05/13/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Noh, Min Seok, Chung, Jae Hoon, Ko, Hyun Soo, Han, Seung Hee, Lee, Moon Il
• Granted Patent: US 9,065,585 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• 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 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

The present invention relates to a method and apparatus for generating a reference signal sequence in a wireless communication system. User equipment receives a cell-specific sequence hopping parameter from a base station, receives, from the base station, a user equipment (UE)-specific sequence group hopping (SGH) parameter which is specific to said user equipment, and generates a reference signal sequence on the basis of a base sequence number of a base sequence, wherein the base sequence number is determined for each slot on the basis of the cell-specific sequence hopping parameter and of the use equipment-specific sequence group hopping parameter. Here, the determination of whether or not to apply sequence hopping to the base sequence number indicated by the user equipment-specific sequence group hopping parameter overrides that of whether or not to apply sequence hopping to the base sequence number indicated by the cell-specific sequence hopping parameter.

Claims

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

receiving a cell-specific sequence hopping parameter from a base station;

receiving a UE-specific sequence group hopping (SGH) parameter that is specific to the UE, from the base station; and

generating a reference signal sequence based on a base sequence number of a base sequence determined on a unit of each slot according to the cell-specific sequence hopping parameter and the UE-specific sequence group hopping parameter;

wherein whether to apply a sequence hopping on the base sequence number indicated by the UE-specific sequence group hopping parameter overrides whether to apply the sequence hopping on the base sequence number indicated by the cell-specific sequence hopping parameter.

2. The method of claim 1, wherein when that the sequence hopping is applied is indicated by the cell-specific sequence hopping parameter, and that the sequence hopping is not applied is indicated by the UE-specific sequence group hopping parameter,

all the base sequence numbers of the base sequences determined on the unit of each slot are the same.

3. The method of claim 2, wherein all the sequence numbers of the base sequences are zeros.

4. The method of claim 2, wherein a value of the cell-specific sequence hopping parameter is 1, and

wherein a value of the UE-specific sequence group hopping parameter is 1.

5. The method of claim 1, wherein the UE-specific sequence group hopping parameter is transmitted through a higher layer.

6. The method of claim 1, wherein the cell-specific sequence hopping parameter is transmitted through a higher layer.

7. The method of claim 1, wherein the base sequence number of the base sequence is either 0 or 1.

8. The method of claim 1, wherein the reference signal sequence uses physical uplink shared channel (PUSCH) resources and is a demodulation reference signal (DMRS) sequence for demodulating a signal.

9. The method of claim 1, wherein a length of the reference signal sequence is larger than six times a size of a resource block (RB) in a frequency domain that is represented by a number of subcarriers.

10. The method of claim 1, wherein the reference signal sequence is generated by shifting the base sequence cyclically.

11. The method of claim 1, further comprising:

receiving a cell-specific group hopping parameter from the base station,

wherein the cell-specific group hopping parameter indicates whether to apply a group hopping on a sequence group number of the base sequence determined on the unit of each slot.

12. The method of claim 11, wherein that the group hoping to the sequence group number is not applied is indicated by the cell-specific group hopping parameter.

13. The method of claim 1, further comprising:

mapping the reference signal sequence to a resource block that includes a plurality of subcarriers and transmitting the result to the base station.

14. A user equipment (UE) for a wireless communication system, the UE comprising:

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

a processor that is connected to the RF unit, and configured for;

receiving a cell-specific sequence hopping parameter from a base station;

receiving a UE-specific sequence group hopping (SGH) parameter that is specific to the UE, from the base station; and

generating a reference signal sequence based on a base sequence number of a base sequence determined on a unit of each slot according to the cell-specific sequence hopping parameter and the UE-specific sequence group hopping parameter;

wherein whether to apply a sequence hopping on the base sequence number indicated by the UE-specific sequence group hopping parameter overrides whether to apply the sequence hopping on the base sequence number indicated by the cell-specific sequence hopping parameter.