Abstract
Provided are a radio communication mobile station apparatus a radio communication base station apparatus and a radio communication method which make it possible to correctly switch between transmission modes for a PUSCH and a PUCCH while impeding signaling overhead from increasing. A transmission mode setting unit ( 107) detects an instruction given by a base station the instruction indicating a multiplexing method for a PUSCH and a PUCCH. A trigger information reporting determination unit (108) performs threshold discrimination where PHR_pucch which is calculated by PHR_control calculation unit (106) is compared with a threshold value that depends on the multiplexing method indicated by the instruction given by the base station. Specifically in a TDM transmission mode trigger information is reported if PHR_pucch>X1(dBm) is satisfied. On the other hand in an FDM transmission mode the trigger information is reported if PHR_pucch<Y1(dBm) is satisfied. Based on a result of the threshold discrimination the trigger information reporting determination unit (108) determines whether to report the trigger information.
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Technologies
Power Headroom Reporting
Product
Not Available
Use Cases
Wireless communication
Services
Not Available
Claim
1. A radio communication apparatus comprising:
a computing section which, in operation, computes a first power headroom (PHR), the first PHR being obtained by subtracting a transmit power for a data channel from a maximum transmit power, and computes a second PHR, the second PHR being obtained by subtracting the transmit power for the data channel and a transmit power for a control channel from the maximum transmit power; and
a transmitting section which, in operation, transmits the first PHR and the second PHR,
wherein when the data channel and the control channel are simultaneously transmitted in different frequency bands, the second PHR is computed and transmitted.
2. The radio communication apparatus according to claim 1, wherein when a simultaneous transmission of the data channel and the control channel in the different frequency bands is configured, the second PHR is computed and transmitted.
3. The radio communication apparatus according to claim 1, wherein: when a simultaneous transmission of the data channel and the control channel in the different frequency bands is not configured, the first PHR is computed and transmitted;
and when the simultaneous transmission of the data channel and the control channel in the different frequency bands is configured, the second PHR is computed and transmitted.
4. The radio communication apparatus according to claim 1, wherein the data channel and the control channel are simultaneously transmitted by transmitting the data channel and the control channel in a same subframe.
5. The radio communication apparatus according to claim 1, wherein the maximum transmit power used for computing the second PHR has a value obtained by subtracting an offset from the maximum transmit power used for computing the first PHR.
6. The radio communication apparatus according to claim 1, wherein when the control channel is not transmitted, the second PHR is transmitted as a MAC element in the data channel.
7. The radio communication apparatus according to claim 1, wherein a number of bits for the first PHR is same as a number of bits for the second PHR.
8. The radio communication apparatus according to claim 1, wherein the data channel is a physical uplink shared channel (PUSCH), and the control channel is a physical uplink control channel (PUCCH).
9. A radio communication method comprising:
computing a first power headroom (PHR), the first PHR being obtained by subtracting a transmit power for a data channel from a maximum transmit power;
computing a second PHR, the second PHR being obtained by subtracting the transmit power for the data channel and a transmit power for a control channel from the maximum transmit power; and
transmitting the first PHR and the second PHR,
wherein when the data channel and the control channel are simultaneously transmitted in different frequency bands, the second PHR is computed and transmitted.
10. The radio communication method according to claim 9, wherein when a simultaneous transmission of the data channel and the control channel in the different frequency bands is configured, the second PHR is computed and transmitted.
11. The radio communication method according to claim 9, wherein: when a simultaneous transmission of the data channel and the control channel in the different frequency bands is not configured, the first PHR is computed and transmitted;
and when the simultaneous transmission of the data channel and the control channel in the different frequency bands is configured, the second PHR is computed and transmitted.
12. The radio communication method according to claim 9, wherein the data channel and the control channel are simultaneously transmitted by transmitting the data channel and the control channel in a same subframe.
13. The radio communication method according to claim 9, wherein the maximum transmit power used for computing the second PHR has a value obtained by subtracting an offset from the maximum transmit power used for computing the first PHR.
14. The radio communication method according to claim 9, wherein when the control channel is not transmitted, the second PHR is transmitted as a MAC element in the data channel.
15. The radio communication method according to claim 9, wherein a number of bits for the first PHR is same as a number of bits for the second PHR.
16. The radio communication method according to claim 9, wherein the data channel is a physical uplink shared channel (PUSCH), and the control channel is a physical uplink control channel (PUCCH).
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