Terminal device, base station device, and communication method
[Object] To provide a terminal device capable of efficiently performing communication in a communication system in which a base station device and the terminal device communicate with each other. [Solution] A terminal device that communicates with a base station device includes: a higher layer processing unit configured to set an STTI channel setting through signaling of a higher layer from the base station device; and a receiving unit configured to receive a first PDSCH in a case in which the STTI channel setting is not set and receive a second PDSCH in a case in which the STTI channel setting is set. The first PDCCH is mapped to one or more resource blocks, and the second PDCCH is mapped to one or more sub resource blocks defined in accordance with a smaller number of symbols than a number of symbols corresponding to a resource block.
1. A terminal device that communicates with a base station device, the terminal device comprising:
a layer processing circuit configured to set a short transmission time interval (STTI) channel setting through signaling of a layer from the base station device; and
a receiver configured to
receive a first physical downlink shared channel (PDSCH) in a case in which the STTI channel setting is not set, and
receive a second PDSCH and a demodulation reference signal corresponding to the second PDSCH in a case in which the STTI channel setting is set, wherein
the first PDSCH is mapped to one or more resource blocks,
the second PDSCH is mapped to a sub resource block defined in accordance with a smaller number of symbols than a number of symbols corresponding to a resource block of the one or more resource blocks, and
in a case in which the demodulation reference signal is not mapped to the sub resource block, the demodulation reference signal is mapped in a resource block including the sub resource block.
2. The terminal device according to claim 1 , wherein
the first PDSCH is mapped to a first resource element other than resources designated by a physical control format indicator channel (PCFICH), and
the second PDSCH is mapped to a second resource element including the resources designated by the PCFICH.
3. The terminal device according to claim 2 , wherein the second PDSCH is not mapped to a resource element used for transmission of the PCFICH.
4. The terminal device according to claim 1 , wherein, in a case in which the first PDSCH is allocated to a predetermined resource block, the second PDSCH is not mapped to a sub resource block included in the predetermined resource block.
5. The terminal device according to claim 1 , wherein, in a case in which the first PDSCH is allocated to a predetermined resource block and the second PDSCH is mapped to a sub resource block included in the predetermined resource block, the first PDSCH is not mapped to the sub resource block to which the second PDSCH is mapped.
6. The terminal device according to claim 5 , wherein the receiver performs a reception process on all the second PDSCH candidates.
7. The terminal device according to claim 1 , wherein the second PDSCH is mapped to any one of one or more second PDSCH candidates set on a basis of the STTI channel setting.
8. The terminal device according to claim 1 , wherein the receiver refrains from receiving the first PDSCH in a sub frame including the sub resource block used for transmission of the second PDSCH.
9. A base station device that communicates with a terminal device, the base station comprising:
a layer processing circuit configured to set a short transmission time interval (STTI) channel setting in the terminal device through signaling of a layer; and
a transmitter configured to
transmit a first physical downlink shared channel (PDSCH) in a case in which the STTI channel setting is not set, and
transmit a second PDSCH and a demodulation reference signal corresponding to the second PDSCH in a case in which the STTI channel setting is set, wherein
the first PDSCH is mapped to one or more resource blocks,
the second PDSCH is mapped to a sub resource block defined in accordance with a smaller number of symbols than a number of symbols corresponding to a resource block of the one or more resource blocks, and
in a case in which the demodulation reference signal is not mapped to the sub resource block, the demodulation reference signal is mapped in a resource block including the sub resource block.
10. A communication method used in a terminal device that communicates with a base station device, the communication method comprising:
setting a short transmission time interval (STTI) channel setting through signaling of a layer from the base station device;
receiving a first physical downlink shared channel (PDSCH) in a case in which the STTI channel setting is not set; and
receiving a second PDSCH and a demodulation reference signal corresponding to the second PDSCH in a case in which the STTI channel setting is set, wherein
the first PDSCH is mapped to one or more resource blocks,
the second PDSCH is mapped to a sub resource block defined in accordance with a smaller number of symbols than a number of symbols corresponding to a resource block of the one or more resource blocks, and
in a case in which the demodulation reference signal is not mapped to the sub resource block, the demodulation reference signal is mapped in a resource block including the sub resource block.
11. A communication method used in a base station device that communicates with a terminal device, the communication method comprising:
setting a short transmission time interval (STTI) channel setting in the terminal device through signaling of a layer;
transmitting a first physical downlink shared channel (PDSCH) in a case in which the STTI channel setting is not set; and
transmitting a second PDSCH and a demodulation reference signal corresponding to the second PDSCH in a case in which the STTI channel setting is set, wherein
the first PDSCH is mapped to one or more resource blocks,
the second PDSCH is mapped to a sub resource block defined in accordance with a smaller number of symbols than a number of symbols corresponding to a resource block of the one or more resource blocks, and
in a case in which the demodulation reference signal is not mapped to the sub resource block, the demodulation reference signal is mapped in a resource block including the sub resource block.