Transmission device, reception device, wireless communication system, and wireless communication method

1. A wireless communication system comprising:

a transmission device configured to simultaneously transmit first data by using a first radio resource and transmit second data by using a second slot, the second slot having a longer time length than the first radio resource; and

a reception device,

wherein the transmission device is configured to

map the second data to the second radio resource allocated to the second data,

insert a known signal to a part of the second radio resource in a first region overlapping with the first radio resource to which the first data is able to be mapped in a time axis direction, in the second radio resource to which the second data is mapped, and

transmit the first data and the second data, and

wherein the reception device is configured to

specify a position of the first radio resource allocated to the first data,

specify the first region in which the first radio resource and the second radio resource overlap in the time axis direction, and

exclude a portion corresponding to the known signal arranged in the part of the second radio resource in the first region from a decoding target when decoding the second data from the second radio resource.

2. The wireless communication system according to claim 1 , wherein

the transmission device is further configured to

set transmission power to be allocated to the second radio resource in the first region to be lower than transmission power to be allocated to the second radio resource outside the first region.

3. The wireless communication system according to claim 1 , wherein,

the transmission device is configured to, in a case of receiving allocation of the first radio resource to the first data after mapping the second data to the second radio resource,

set a range in which the allocated first radio resource and the second radio resource overlap in the time axis direction as the first region, and

insert the known signal to a part of the second radio resource in the first region.

4. The wireless communication system according to claim 1 , wherein

the transmission device is further configured to

set a range in which the periodically allocated first radio resource and the second radio resource to which the second data is mapped overlap in the time axis direction as the first region, and

insert the known signal to a part of the second radio resource in the first region.

5. The wireless communication system according to claim 1 , wherein

the transmission device is further configured to

insert the known signal to a part of the second radio resource in the first region in a case where a modulation scheme to be applied to the second data is quadrature amplitude modulation, and

the reception device is further configured to

exclude a portion corresponding to the known signal arranged in the part of the second radio resource in the first region from a decoding target in the case where the modulation scheme to be applied to the second data is the quadrature amplitude modulation.

6. The wireless communication system according to claim 1 , wherein

the transmission device is further configured to

insert the known signal to a part of the second radio resource in the first region according to an arrangement pattern associated with a modulation scheme to be applied to the second data, and

the reception device is further configured to

exclude a portion corresponding to the known signal arranged in the part of the second radio resource in the first region from a decoding target according to the arrangement pattern associated with the modulation scheme to be applied to the second data.