Terminal apparatus, base station and communication method
A base station includes a transmitter which transmits an offset value for a transmission power of a sounding reference signal (SRS) to a terminal apparatus; and a receiver which receives the SRS at the transmission power controlled by the terminal apparatus. The offset value used to control the transmission power is set within one of a first offset setting range having a first lower limit value and a first upper limit value and a second offset setting range having a second lower limit value and a second upper limit value. A difference between the first and second lower limit values equals a difference between the first and second upper limit values. A step width of the offset values within the first offset setting range equals a step width of the offset values within the second offset setting range. The SRS is a periodic SRS (P-SRS) or an aperiodic SRS (A-SRS).
1. A base station comprising:
a transmitter which, in operation, transmits an offset value for a transmission power of a sounding reference signal (SRS) to a terminal apparatus, the terminal apparatus controlling the transmission power using the offset value; and
a receiver which, in operation, receives the SRS according to the controlled transmission power, wherein
the offset value used to control the transmission power is set within one of a first offset setting range having a first lower limit value and a first upper limit value and a second offset setting range having a second lower limit value and a second upper limit value, wherein a difference between the first lower limit value and the second lower limit value is equal to a difference between the first upper limit value and the second upper limit value,
a step width of the offset values within the first offset setting range equals a step width of the offset values within the second offset setting range, and
the SRS is a periodic SRS (P-SRS) or an aperiodic SRS (A-SRS).
2. The base station according to claim 1 , wherein the first and second offset setting ranges are set for the P-SRS and for the A-SRS, respectively.
3. The base station according to claim 1 , wherein a bit length of the offset value within the first offset setting range equals a bit length of the offset value within the second offset setting range.
4. The base station according to claim 1 , wherein the offset value is included in higher layer control information.
5. The base station according to claim 1 , wherein the second offset setting range is used when a path loss between the terminal apparatus and the base station exceeds a predetermined value.
6. The base station according to claim 1 , wherein the first offset setting range is used during transmission from the terminal apparatus to the base station.
7. A communication method implemented by a base station, the method comprising:
transmitting an offset value for a transmission power of a sounding reference signal (SRS) to a terminal apparatus, the terminal apparatus controlling the transmission power using the offset value; and
receiving the SRS according to the controlled transmission power, wherein
the offset value used to control the transmission power is set within one of a first offset setting range having a first lower limit value and a first upper limit value and a second offset setting range having a second lower limit value and a second upper limit value, wherein a difference between the first lower limit value and the second lower limit value is equal to a difference between the first upper limit value and the second upper limit value,
a step width of the offset values within the first offset setting range equals a step width of the offset values within the second offset setting range, and
the SRS is a periodic SRS (P-SRS) or an aperiodic SRS (A-SRS).
8. The communication method according to claim 7 , wherein the first and second offset setting ranges are set for the P-SRS and for the A-SRS, respectively.
9. The communication method according to claim 7 , wherein a bit length of the offset value within the first offset setting range equals a bit length of the offset value within the second offset setting range.
10. The communication method according to claim 7 , wherein the offset value is included in higher layer control information.
11. The communication method according to claim 7 , wherein the offset value is selected from the second offset setting range when a path loss between the terminal apparatus and the base station exceeds a predetermined value.
12. The communication method according to claim 7 , wherein the offset value is selected from the first offset setting range during transmission from the terminal apparatus to the base station.
13. An integrated circuit that controls a process performed at a base station, the process comprising:
transmitting an offset value for a transmission power of a sounding reference signal (SRS) to a terminal apparatus, the terminal apparatus controlling the transmission power using the offset value; and
receiving the SRS according to the controlled transmission power, wherein
the offset value used to control the transmission power is set within one of a first offset setting range having a first lower limit value and a first upper limit value and a second offset setting range having a second lower limit value and a second upper limit value, wherein a difference between the first lower limit value and the second lower limit value is equal to a difference between the first upper limit value and the second upper limit value,
a step width of the offset values within the first offset setting range equals a step width of the offset values within the second offset setting range, and
the SRS is a periodic SRS (P-SRS) or an aperiodic SRS (A-SRS).
14. The integrated circuit according to claim 13 , wherein the first and second offset setting ranges are set for the P-SRS and for the A-SRS, respectively.
15. The integrated circuit according to claim 13 , wherein a bit length of the offset value within the first offset setting range equals a bit length of the offset value within the second offset setting range.
16. The integrated circuit according to claim 13 , wherein the offset value is included in higher layer control information.
17. The integrated circuit according to claim 13 , wherein the offset value is selected from the second offset setting range when a path loss between the terminal apparatus and the base station exceeds a predetermined value.
18. The integrated circuit according to claim 13 , wherein the offset value is selected from the first offset setting range during transmission from the terminal apparatus to the base station.