Transmitter and transmission method
View Patent ↗The present invention provides a transmitter which can suitably perform a transmission power control in a PT-RS port. In this transmitter ( 100 ), a control unit ( 101 ) determines a transmission power for transmitting a reference signal (PT-RS) for phase tracking and a data signal within a range in which the maximum transmission power for each antenna port is not exceeded. In addition, a transmission unit ( 105 ) transmits the reference signal for phase tracking and the data signal at the transmission power determined by the control unit ( 101 ).
1. A transmission apparatus, comprising:
circuitry, which, in operation, adjusts a transmission power of a phase tracking reference signal (PT-RS) using a power ratio between the PT-RS and a data signal, wherein the power ratio between the PT-RS and the data signal for a defined number of layers is changed in case of a non-coherent transmission and in case of a partial coherent transmission; and
a transmitter, which, in operation, transmits the PT-RS at the adjusted transmission power.
2. The transmission apparatus according to claim 1 , wherein the circuitry, in operation, adjusts the transmission power of the PT-RS to be less than or equal to a maximum transmission power of an antenna port from which the PT-RS is transmitted.
3. The transmission apparatus according to claim 1 , wherein the circuitry, in operation, based on an indication, adjusts the transmission power of an antenna port from which the PT-RS is transmitted and does not adjust a transmission power of another antenna port.
4. The transmission apparatus according to claim 1 , wherein the circuitry, in operation, determines, based on an indication, whether or not the transmission power of the PT-RS is adjusted.
5. The transmission apparatus according to claim 1 , wherein the circuitry, in operation, adjusts the transmission power in a case where a Power Headroom Report (PHR), which is calculated using a maximum transmission power of the transmitter and a transmission power of the data signal, is less than a threshold value.
6. The transmission apparatus according to claim 1 , wherein the circuitry, in operation, adjusts the transmission power in a case where a Power Headroom Report (PHR), which is calculated using a maximum transmission power of an antenna port from which the PT-RS is transmitted and a transmission power of the data signal, is less than a threshold value.
7. The transmission apparatus according to claim 1 , wherein the circuitry, in operation, determines, based on at least one of a signal waveform, a modulation coding scheme, and an allocated band indicated by the base station, whether or not to adjust the transmission power per resource element (RE) of the PT-RS to be larger than a transmission power per RE of the data signal.
8. A transmission method, comprising:
adjusting a transmission power of a phase tracking reference signal (PT-RS) using a power ratio between the PT-RS and a data signal, wherein the power ratio between the PT-RS and the data signal for a defined number of layers is changed in case of a non-coherent transmission and in case of a partial coherent transmission; and
transmitting the PT-RS at the adjusted transmission power.
9. The transmission method according to claim 8 , wherein the adjusting includes adjusting the transmission power of the PT-RS to be less than or equal to a maximum transmission power of an antenna port from which the PT-RS is transmitted.
10. The transmission method according to claim 8 , wherein the adjusting includes, based on an indication, adjusting the transmission power of an antenna port from which the PT-RS is transmitted and not adjusting a transmission power of another antenna port.
11. The transmission method according to claim 8 , comprising determining, based on an indication, whether or not the transmission power of the PT-RS is adjusted.
12. The transmission method according to claim 8 , wherein the adjusting includes adjusting the transmission power in a case where a Power Headroom Report (PHR), which is calculated using a maximum transmission power of the transmitter and a transmission power of the data signal, is less than a threshold value.
13. The transmission method according to claim 8 , wherein the adjusting includes adjusting the transmission power in a case where a Power Headroom Report (PHR), which is calculated using a maximum transmission power of an antenna port from which the PT-RS is transmitted and a transmission power of the data signal, is less than a threshold value.
14. The transmission method according to claim 8 , comprising determining, based on at least one of a signal waveform, a modulation coding scheme, and an allocated band indicated by the base station, whether or not to adjust the transmission power per resource element (RE) of the PT-RS to be larger than a transmission power per RE of the data signal.