Transmission device, reception device, and communication method
In a case of a contention-based radio communication technique, it is necessary to identify a terminal apparatus that has performed data transmission among terminal apparatuses sharing frequency resources. There is a problem that it is difficult to identify the terminal apparatus that has performed data transmission in a case with a large number of terminal apparatuses that are non-orthogonally spatial multiplexed. Provided is a transmission device for transmitting a data signal to a reception device, the transmission device including: a transmission processing unit configured to transmit the data signal without performing SR transmission or receiving control information of transmission permission transmitted from the reception device; an identification signal multiplexing unit configured to multiplex an identification signal to an orthogonal resource; and a control information receiving unit configured to receive in advance a transmission parameter relating to transmission of the data signal. The transmission processing unit transmits the identification signal and a data signal in a case that the transmission processing unit repeatedly transmits the same data signal, based on the transmission parameter.
1. A terminal apparatus for transmitting a data signal to a base station apparatus, the terminal apparatus comprising:
transmission processing circuitry configured to perform first data signal transmission of transmitting the data signal without receiving downlink control information of transmission permission transmitted from the base station apparatus and perform second data signal transmission of receiving the downlink control information of the transmission permission and transmitting the data signal based on the downlink control information;
identification signal multiplexing circuitry configured to multiplex an identification signal to an orthogonal resource; and
control information receiving circuitry configured to receive in advance a transmission parameter relating to transmission of the data signal, wherein
the transmission processing circuitry is configured to transmit the identification signal with consecutive Orthogonal Frequency-Division Multiplexing (OFDM) symbols and a data signal in a case of repeatedly transmitting the same data signal, based on the transmission parameter.
2. The terminal apparatus according to claim 1 , wherein, in a case that the transmission processing circuitry repeatedly transmits the same data signal, the orthogonal resource to which the identification signal is multiplexed, is selected to be an orthogonal resource different for each data signal transmission.
3. The terminal apparatus according to claim 1 , wherein the orthogonal resource is configured by at least one element of an OFDM symbol, a subcarrier, an OCC sequence, a CS pattern, and an IFDMA pattern.
4. The terminal apparatus according to claim 1 , wherein the transmission parameter relating to the data signal transmission includes a degree of reliability of the data signal transmission that the terminal apparatus is required to have or the number of times the same data signal is transmitted, the number of times being configured according to delay time.
5. The terminal apparatus according to claim 2 , wherein the orthogonal resource to which the identification signal is multiplexed is determined based on the number of times the same data signal is transmitted.
6. The terminal apparatus according to claim 2 , wherein the orthogonal resource to which the identification signal is multiplexed is determined based on a subframe number of a subframe in which the same data signal is transmitted.
7. A base station apparatus for receiving a data signal from each of multiple-terminal apparatuses, the base station apparatus comprising:
reception processing circuitry configured to perform first data signal reception of receiving the data signal transmitted without transmitting downlink control information of transmission permission and perform second data signal reception of transmitting the downlink control information of the transmission permission and receiving the data signal transmitted based on the downlink control information;
identification signal separator circuitry configured to separate, from an orthogonal resource, an identification signal received together with the data signal;
transmission terminal identification circuitry configured to identify, based on the identification signal, the terminal apparatus that has performed data signal transmission; and
control information transmitting circuitry configured to transmit in advance a transmission parameter to be used for the data signal transmission, wherein
the reception processing circuitry is configured to receive the identification signal with consecutive Orthogonal Frequency-Division Multiplexing (OFDM) symbols and a data signal in a case of receiving, in the first data signal reception, the same data signal repeatedly transmitted based on the transmission parameter.
8. The base station apparatus according to claim 7 , wherein, in a case that the reception processing circuitry receives the same data signal repeatedly transmitted from the terminal apparatus, the transmission terminal identification circuitry identifies the terminal apparatus, based on the identification signal multiplexed to the orthogonal resource different for each data signal reception.
9. The base station apparatus according to claim 7 , wherein ACK/NACK is transmitted in the second data signal reception while ACK/NACK is not transmitted in the first data signal reception.
10. The base station apparatus according to claim 7 , comprising signal detection circuitry configured to detect the data signal transmitted from the terminal apparatus, wherein
in the first data signal reception, ACK/NACK is transmitted within a prescribed time from a subframe in which the signal detection circuitry correctly receives the data signal while the same data signal repeatedly transmitted is received.
11. A communication method for a terminal apparatus for transmitting a data signal to a base station apparatus, the communication method comprising:
performing first data signal transmission of transmitting the data signal without receiving downlink control information of transmission permission transmitted from the base station apparatus and performing second data signal transmission of receiving the downlink control information of the transmission permission and transmitting the data signal based on the downlink control information;
multiplexing an identification signal to an orthogonal resource;
receiving in advance a transmission parameter relating to transmission of the data signal; and
transmitting the identification signal with consecutive Orthogonal Frequency-Division Multiplexing (OFDM) symbols and a data signal in a case of repeatedly transmitting the same data signal, based on the transmission parameter.
12. A communication method for a base station apparatus for receiving a data signal from each of multiple terminal apparatuses, the communication method comprising:
performing first data signal reception of receiving the data signal transmitted without transmitting downlink control information of transmission permission and performing second data signal reception of transmitting the downlink control information of the transmission permission and receiving the data signal transmitted based on the downlink control information;
separating, from an orthogonal resource, an identification signal received together with the data signal;
identifying, based on the identification signal, the terminal apparatus that has performed data signal transmission;
transmitting in advance a transmission parameter to be used for the data signal transmission; and
receiving the identification signal with consecutive Orthogonal Frequency-Division Multiplexing (OFDM) symbols and a data signal in a case of receiving, in the first data signal reception, the same data signal repeatedly transmitted based on the transmission parameter.