Terminal device, base station device, communication system, reception method, transmission method, and communication method
A terminal device according to an aspect of the present invention includes a reception module that receives a control channel and a spatially multiplexed data signal channel, a control signal detection module that extracts, from an output from the reception module, a demodulation control information which is a transmission parameter of a signal that is transmitted to the terminal device, in a data signal channel that is output from the reception module, and assistance control information which is a transmission parameter of a signal that is transmitted to a different terminal device, in the data signal channel that is output from the reception module, a channel estimator that obtains a channel estimate by using a reference signal, a signal detection module that demultiplexes the data signal channel by using the demodulation control information, the assistance control information, and the channel estimate, and a decoding module that decodes a signal that is output by the signal detection module, in which information indicating a rank is included in the assistance control information.
1. A base station apparatus, comprising:
reception circuitry; and
transmission circuitry that transmit, to a terminal apparatus, assistance information by using a Physical Downlink Shared Channel (PDSCH) in a first cell; wherein
the assistance information is using to suppress an interference from a second cell;
the second cell is a neighbor cell of the first cell; and
the assistance information includes at least a cell ID of the second cell, information regarding a power ratio between a reference signal and a data signal channel in the second cell, and information regarding a transmission mode in the second cell.
2. The base station apparatus according to claim 1 , wherein the assistance information further includes information regarding a power ratio between a first data signal channel and a second data signal channel in the second cell.
3. The base station apparatus according to claim 1 , wherein the assistance information includes information that the base station apparatus received from another base station apparatus.
4. The base station apparatus according to claim 1 , wherein
the reception circuitry receives User Equipment (UE) capability information from the terminal apparatus; and
the UE capability information includes information that the terminal apparatus has a capability to cancel or suppress an interference.
5. A terminal apparatus comprising:
transmission circuitry; and
reception circuitry that receives, from a base station apparatus, assistance information by using a Physical Downlink Shared CHannel (PDSCH) in a first cell; wherein
the assistance information is used to suppress an interference from a second cell;
the second cell is a neighbor cell of the first cell; and
the assistance information includes at least a cell ID of the second cell, information regarding a power ratio between a reference signal and a data signal channel in the second cell, and information regarding a transmission mode in the second cell.
6. The terminal apparatus according to claim 5 , wherein the assistance information further includes information regarding a power ratio between a first data signal channel and a second data signal channel in the second cell.
7. The terminal apparatus according to claim 5 , wherein the assistance information includes information that the base station apparatus received from another base station apparatus.
8. The terminal apparatus according to claim 5 , wherein
the transmission circuitry transmits User Equipment (UE) capability information to the base station apparatus; and
the UE capability information includes information that the terminal apparatus has a capability to cancel or suppress an interference.
9. A method performed by a terminal apparatus, the method comprising:
receiving, from a base station apparatus, assistance information by using a Physical Downlink Shared CHannel (PDSCH) in a first cell; wherein
the assistance information is capable of being used to suppress an interference from a second cell;
the second cell is a neighbor cell of the first cell; and
the assistance information includes at least a cell ID of the second cell, information regarding a power ratio between a reference signal and a data signal channel in the second cell, and information regarding a transmission mode in the second cell.
10. The method according to claim 9 , wherein the assistance information further includes information regarding a power ratio between a first data signal channel and a second data signal channel in the second cell.
11. The method according to claim 9 , wherein the assistance information includes information that the base station apparatus received from another base station apparatus.
12. The method according to claim 9 , further comprising:
transmitting User Equipment (UE) capability information to the base station apparatus before receiving the assistance information from the base station apparatus; wherein
the UE capability information includes information that the terminal apparatus has a capability to cancel or suppress an interference.
13. The base station apparatus according to claim 1 , wherein the assistance information further includes information regarding a duplex scheme.
14. The terminal apparatus according to claim 5 , wherein the assistance information further includes information regarding a duplex scheme.
15. The method according to claim 9 , wherein the assistance information further includes information regarding a duplex scheme.