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 ( 100 ) controls the transmission power of a second signal by adding an offset to the transmission power of a first signal; an offset-setting unit ( 106 ) 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 ( 111 ) controls the transmission power of the second signal using the correction value.
1. A terminal apparatus comprising:
a reference signal generating section configured to generate a first Sounding Reference Signal (SRS) with a first transmission time interval and a second SRS with a second transmission time interval, the second transmission time interval being different from the first transmission time interval, both of the first SRS and the second SRS being reference signals for channel-quality estimation;
an offset setting section configured to set a first offset value to control transmission power used to transmit the first SRS and to set a second offset value to control transmission power used to transmit the second SRS, second offset value being different from the first offset value; and
a transmitting section configured to transmit the first SRS with the transmission power controlled based on the first offset value and to transmit the second SRS with the transmission power controlled based on the second offset value.
2. The terminal apparatus according to claim 1 , wherein
the offset setting section sets a greater offset value for a longer transmission time interval.
3. The terminal apparatus according to claim 2 , wherein
the offset setting section sets each of the first and the second offset values by adding a correction value to a transmission power offset value specified by a base station apparatus.
4. The terminal apparatus according to claim 1 , wherein
the offset setting section sets each of the first and the second offset values by adding a correction value to a transmission power offset value specified by a base station apparatus.
5. The terminal apparatus according to claim 1 , wherein
the first SRS is a periodic SRS which is transmitted periodically, and a second SRS is an aperiodic SRS which is transmitted aperiodically.
6. The terminal apparatus according to claim 5 , wherein
the offset setting section sets the second offset value to be greater than the first offset value.
7. A method of controlling transmission power of a reference signal, the method comprising:
generating a first Sounding Reference Signal (SRS) with a first transmission time interval and a second SRS with a second transmission time interval, the second transmission time interval being different from the first transmission time interval, both of the first SRS and the second SRS being reference signals for channel-quality estimation;
setting a first offset value to control transmission power used to transmit the first SRS and to set a second offset value to control transmission power used to transmit the second SRS, the second offset value being different from the first offset value; and
transmitting the first SRS with the transmission power controlled based on the first offset value and transmitting the second SRS with the transmission power controlled based on the second offset value.
8. The method according to claim 7 , wherein
a greater offset value is set for a longer transmission time interval.
9. The method according to claim 8 , wherein
each of the first and the second offset values is set by adding a correction value to a transmission power offset value specified by a base station apparatus.
10. The method according to claim 7 , wherein
each of the first and the second offset values is set by adding a correction value to a transmission power offset value specified by a base station apparatus.
11. The method according to claim 7 , wherein
the first SRS is a periodic SRS which is transmitted periodically, and a second SRS is an aperiodic SRS which is transmitted aperiodically.
12. The method according to claim 11 , wherein
the second offset value is set to be greater than the first offset value.