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