Terminal and communication method
In a terminal, an SRS drop control unit drops a portion of partial bands from among a plurality of partial bands in a case where transmission power for reference signals generated using a plurality of sequences having a sequence length that corresponds to a partial band exceeds a threshold value. Furthermore, a radio transmission unit transmits the reference signals by means of the remaining partial bands other than the portion of partial bands that are dropped from among the plurality of partial bands.
1. A terminal comprising:
circuitry, which, in operation, drops a portion of partial frequency bands from among a plurality of partial frequency bands of a reference signal transmission bandwidth in a case where transmission power for reference signals generated using a plurality of sequences having a sequence length that corresponds to a partial frequency band exceeds a threshold value; and
a transmitter, which, in operation, transmits the reference signals using remaining partial frequency bands of the reference signal transmission bandwidth other than the portion of partial frequency bands that is dropped from among the plurality of partial frequency bands.
2. The terminal according to claim 1 ,
wherein the circuitry, in operation, drops non-contiguous partial frequency bands from among the plurality of partial frequency bands.
3. The terminal according to claim 1 ,
wherein the circuitry, in operation, drops contiguous partial frequency bands from among the plurality of partial frequency bands.
4. The terminal according to claim 1 ,
wherein the portion of partial frequency bands that is dropped is associated with terminal-specific information.
5. The terminal according to claim 1 ,
wherein the portion of partial frequency bands that is dropped is associated with timings at which the terminal transmits the reference signals.
6. The terminal according to claim 1 ,
wherein the transmitter, in operation, transmits the reference signals in accordance with a plurality of items of setting information indicating partial frequency bands to which the reference signals are allocated, and
wherein the portion of partial frequency bands that is dropped is indicated in one or more of the plurality of items of setting information.
7. The terminal according to claim 1 ,
wherein the portion of partial frequency bands that is dropped includes at least one partial frequency band out of partial frequency bands for which there have been set code sequences having sequence numbers that are the same, from among the plurality of partial frequency bands.
8. The terminal according to claim 1 ,
wherein the portion of partial frequency bands that is dropped includes at least one partial frequency band out of partial frequency bands having set therefor code sequences in which both sequence numbers and cyclic shift numbers are the same, from among the plurality of partial frequency bands.
9. A communication method comprising:
dropping a portion of partial frequency bands from among a plurality of partial frequency bands of a reference signal transmission bandwidth in a case where transmission power for reference signals generated using a plurality of sequences having a sequence length that corresponds to a partial frequency band exceeds a threshold value; and
transmitting the reference signals using remaining partial frequency bands of the reference signal transmission bandwidth other than the portion of partial frequency bands that is dropped from among the plurality of partial frequency bands.
10. The communication method according to claim 9 ,
wherein the dropping includes dropping non-contiguous partial frequency bands from among the plurality of partial frequency bands.
11. The communication method according to claim 9 ,
wherein the dropping includes dropping contiguous partial frequency bands from among the plurality of partial frequency bands.
12. The communication method according to claim 9 ,
wherein the portion of partial frequency bands that is dropped is associated with communication method-specific information.
13. The communication method according to claim 9 ,
wherein the portion of partial frequency bands that is dropped is associated with timings at which the terminal transmits the reference signals.
14. The communication method according to claim 9 ,
wherein the transmitting includes transmitting the reference signals in accordance with a plurality of items of setting information indicating partial frequency bands to which the reference signals are allocated, and
wherein the portion of partial frequency bands that is dropped is indicated in one or more of the plurality of items of setting information.
15. The communication method according to claim 9 ,
wherein the portion of partial frequency bands that is dropped includes at least one partial frequency band out of partial frequency bands for which there have been set code sequences having sequence numbers that are the same, from among the plurality of partial frequency bands.
16. The communication method according to claim 9 ,
wherein the portion of partial frequency bands that is dropped includes at least one partial frequency band out of partial frequency bands having set therefor code sequences in which both sequence numbers and cyclic shift numbers are the same, from among the plurality of partial frequency bands.