Method for transmitting sounding reference signal in multiple antenna wireless communication system and apparatus therefor
A method for transmitting sounding reference signals by a user equipment (UE) in a wireless communication system, and the UE therefore are discussed. The method according to one embodiment includes configuring an initial cyclic shift (CS) value and an initial comb value via a higher layer; and setting a comb value for at least one antenna port according to an Equation A. The method according to the embodiment further includes transmitting the sounding reference signals using the comb value via at least one antenna port.
1. A method for transmitting sounding reference signals via multiple antenna ports by a user equipment (UE) in a wireless communication system, the method comprising:
setting comb values for the multiple antenna ports based on a number of the multiple antenna ports and an initial cyclic shift (CS) value configured by a higher layer; and
transmitting the sounding reference signals using the comb values via the multiple antenna ports,
wherein, if the number of the multiple antenna ports is 4 and if the initial CS value is one of predetermined values, comb values for two of the multiple antenna ports are set to an initial comb value configured by the higher layer and comb values for the other two of the multiple antenna ports are set to a value different from the initial comb value, and
wherein, if the number of the multiple antenna ports is 4 and if the initial CS value is not one of the predetermined values, all of the comb values for the multiple antenna ports are set to the initial comb value.
2. The method of claim 1 , wherein the comb values for the multiple antenna ports are 0 or 1.
3. The method of claim 1 , wherein, if the number of the multiple antenna ports is not 4, all of the comb values for the multiple antenna ports are set to the initial comb value.
4. The method of claim 1 , wherein the initial CS value is an integer between 0 and 7, and the predetermined values are integers between 4 and 7.
5. A user equipment (UE) in a wireless communication system, the UE comprising:
multiple antenna ports;
a processor configured to set comb values for the multiple antenna ports based on a number of the multiple antenna ports and an initial cyclic shift (CS) value configured by a higher layer; and
an RF (Radio Frequency) module configured to transmit sounding reference signals using the comb values via the multiple antenna ports,
wherein, if the number of the multiple antenna ports is 4 and if the initial CS value is one of predetermined values, the processor sets comb values for two of the multiple antenna ports to an initial comb value configured by the higher layer and sets comb values for the other two of the multiple antenna ports to a value different from the initial comb value, and
wherein, if the number of the multiple antenna ports is 4 and if the initial CS value is not one of the predetermined values, the processor sets all of the comb values for the multiple antenna ports to the initial comb value.
6. The UE of claim 5 , wherein the comb values for the multiple antenna ports are 0 or 1.
7. The UE of claim 5 , wherein, if the number of the multiple antenna ports is not 4, the processor sets all of the comb values for the multiple antenna ports to the initial comb value.
8. The UE of claim 5 , wherein the initial CS value is an integer between 0 and 7, and the predetermined values are integers between 4 and 7.