Method and apparatus for transmitting and receiving wireless signal in wireless communication system
The present invention relates to a wireless communication system and, particularly, to a method and an apparatus for the same, the method comprising: mapping, in an SF, a first set of physical channels over all symbols; mapping, in the SF, a second set of physical channels over all remaining symbols, excluding the last symbol; reducing transmission power of the first set of physical channels such that the sum of transmission powers of the first and second sets of physical channels does not exceed a maximum power value; dropping, in the SF, an SRS transmission when the sum of the reduced transmission power of the first physical channel and SRS transmission power exceeds the maximum power value; and performing, in the SF, an SRS transmission when the sum of the reduced transmission power of the first physical channel and SRS transmission power does not exceed the maximum power value.
1. A method for controlling SRS (sounding reference signal) transmission in a subframe (SF) in a wireless communication system, the method performed by a user equipment and comprising:
mapping a first set of physical channels over all SC-FDMA (single carrier frequency division multiple access) symbols in the SF of a first cell;
mapping a second set of physical channels over all remaining SC-FDMA symbols except a last SC-FDMA symbol in the SF of a second cell;
reducing transmit power of the first set of physical channels such that a first sum of transmit power of the first and seconds sets of the physical channels does not exceed a maximum transmit power;
dropping the SRS transmission in the SF of a cell other than the first cell when a second sum of the reduced transmit power of the first set of the physical channels and transmit power of the SRS exceeds the maximum transmit power; and
performing the SRS transmission in the SF of the cell other than the first cell when the second sum does not exceed the maximum transmit power,
wherein the first sum corresponds to a sum of transmit power at all of the SC-FDMA symbols except the last SC-FDMA symbol in the SF, and
wherein the second sum corresponds to a sum of transmit power at the last SC-FDMA symbol in the SF.
2. The method of claim 1 , further comprising:
applying a first TA (timing advance) value to the first set of the physical channels; and
applying a second TA value different from the first TA value to the second set of the physical channels and the SRS.
3. The method of claim 1 , wherein dropping the SRS transmission in the SF includes reducing the transmit power of the SRS to 0.
4. The method of claim 1 , wherein each of the first set of the physical channels and the second set of the physical channels comprise at least a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel).
5. A user equipment (UE) for controlling SRS (sounding reference signal) transmission in a subframe (SF) in a wireless communication system, the UE comprising:
an RF (radio frequency) module configured to transmit and receive signals; and
a processor configured to:
map a first set of physical channels over all SC-FDMA (single carrier frequency division multiple access) symbols in the SF of a first cell;
map a second set of physical channels over all remaining SC-FDMA symbols except a last SC-FDMA symbol in the SF of a second cell;
reduce transmit power of the first set of physical channels such that a first sum of transmit power of the first and seconds sets of the physical channels does not exceed a maximum transmit power,
drop the SRS transmission in in the SF of a cell other than the first cell when a second sum of the reduced transmit power of the first set of the physical channels and transmit power of the SRS exceeds the maximum transmit power; and
perform the SRS transmission in the SF of the cell other than the first cell when the second sum does not exceed the maximum transmit power,
wherein the first sum corresponds to a sum of transmit power at all of the SC-FDMA symbols except the last SC-FDMA symbol in the SF, and
wherein the second sum corresponds to a sum of transmit power at the last SC-FDMA symbol in the SF.
6. The user equipment of claim 5 , wherein the processor is further configured to:
apply a first TA (timing advance) value to the first set of the physical channels; and
apply a second TA value different from the first TA value to the second set of the physical channels and the SRS.
7. The user equipment of claim 5 , wherein dropping the SRS transmission in the SF includes reducing the transmit power of the SRS to 0.
8. The user equipment of claim 5 , wherein each of the first set of the physical channels and the second set of the physical channels comprise at least a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel).