Wireless communication device and method for controlling transmission power
Disclosed is a wireless communication device that can suppress an increase in power consumption of a terminal while preventing the degradation of SINR measurement precision resulting from TPC errors in a base station. A terminal controls the transmission power of a second signal by adding an offset to the transmission power of a first signal; an offset-setting unit sets an offset correction value in response to a transmission time gap between a third signal transmitted the previous time and the second signal transmitted this time; and a transmission power control unit controls the transmission power of the second signal using the correction value.
1. A communication apparatus comprising:
circuitry, which, in operation, generates a first Sounding Reference Signal (SRS) which is to be transmitted periodically and a second SRS which is to be transmitted with a time interval between triggering and transmission that is different from a transmission time interval of the first SRS, both of the first SRS and the second SRS being reference signals for channel-quality estimation; and
a transmitter, which, in operation, transmits the first SRS with a transmission power controlled based on a first power parameter indicated by a base station and transmits the second SRS with a transmission power controlled based on a second power parameter indicated by the base station, the second power parameter being different from the first power parameter.
2. The communication apparatus according to claim 1 , wherein a greater power is set for a longer transmission time interval.
3. The communication apparatus according to claim 1 , wherein the first SRS is a periodic SRS, and the second SRS is an aperiodic SRS which is transmitted aperiodically.
4. The communication apparatus according to claim 3 , wherein the second power parameter is set to be greater than the first power parameter.
5. A communication method comprising:
generating a first Sounding Reference Signal (SRS) which is to be transmitted periodically and a second SRS which is to be transmitted with a time interval between triggering and transmission that is different from a transmission time interval of the first SRS, both of the first SRS and the second SRS being reference signals for channel-quality estimation; and
transmitting the first SRS with a transmission power controlled based on a first power parameter indicated by a base station and transmits the second SRS with a transmission power controlled based on a second power parameter indicated by the base station, the second power parameter being different from the first power parameter.
6. The communication method according to claim 5 , wherein a greater power is set for a longer transmission time interval.
7. The communication method according to claim 5 , wherein the first SRS is a periodic SRS, and the second SRS is an aperiodic SRS which is transmitted aperiodically.
8. The communication method according to claim 7 , wherein the second power parameter is set to be greater than the first power parameter.