Terminal apparatus, base station apparatus, and communication method
A terminal apparatus includes a medium access control layer processing unit configured to manage a HARQ process, and a physical layer processing unit configured to perform processing associated with a PUSCH transmission on a physical layer. A first HARQ process configured for the terminal apparatus determines whether or not to indicate to the physical layer processing unit to generate a transmission of the first HARQ process, based at least on whether or not the transmission of the first HARQ process and a transmission of a second HARQ process occur in the same transmission time. The transmission of the second HARQ process is scheduled so as to use short processing time.
1. A terminal apparatus comprising:
a receiver configured to receive a physical downlink control channel (PDCCH) including an uplink grant; and
a medium access control layer processing unit configured to manage a hybrid automatic repeat request (HARQ) entity, wherein
the HARQ entity manages a first HARQ process and a second HARQ process in parallel,
in a case that the uplink grant is not indicated for the first HARQ process and a transmission time interval (TTI) and a HARQ buffer of the first HARQ process is not empty, the HARQ entity indicates to the first HARQ process to generate a non-adaptive retransmission, and
in a case that the non-adaptive retransmission of the first HARQ process collides with a transmission of the second HARQ process scheduled so as to use short processing time, the medium access control layer processing unit sets an ACK for a transport block in a state variable HARQ_FEEDBACK of the first HARQ process, based on an indication from the HARQ entity.
2. The terminal apparatus according to claim 1 , wherein
for FDD, a physical uplink shared channel (PUSCH) transmission corresponding to the second HARQ process is performed in a third subsequent subframe from a subframe in which the uplink grant has been received.
3. A base station apparatus comprising:
a transmitter configured to transmit a physical downlink control channel (PDCCH) including an uplink grant; and
a medium access control layer processing unit configured to manage a hybrid automatic repeat request (HARQ) entity, wherein
the HARQ entity manages a first HARQ process and a second HARQ process in parallel,
in a case that the uplink grant is not indicated for the first HARQ process and a transmission time interval (TTI) and a HARQ buffer of the first HARQ process is not empty, the HARQ entity indicates to the first HARQ process to generate a non-adaptive retransmission, and
in a case that the non-adaptive retransmission of the first HARQ process collides with a transmission of the second HARQ process scheduled so as to use short processing time, the medium access control layer processing unit sets an ACK for a transport block in a state variable HARQ_FEEDBACK of the first HARQ process, based on an indication from the HARQ entity.
4. The base station apparatus according to claim 3 , wherein
for FDD, a physical uplink shared channel (PUSCH) reception corresponding to the second HARQ process is performed in a third subsequent subframe from a subframe in which the uplink grant has been transmitted.
5. A communication method used for a terminal apparatus, the communication method comprising:
a reception step of receiving a physical downlink control channel (PDCCH) including an uplink grant; and
a medium access control layer processing step of managing a hybrid automatic repeat request (HARQ) entity, wherein
the HARQ entity manages a first HARQ process and a second HARQ process in parallel,
in a case that the uplink grant is not indicated for the first HARQ process and a transmission time interval (TTI) and a HARQ buffer of the first HARQ process is not empty, the HARQ entity indicates to the first HARQ process to generate a non-adaptive retransmission, and
in a case that the non-adaptive retransmission of the first HARQ process collides with a transmission of the second HARQ process scheduled so as to use short processing time, the medium access control layer processing unit sets an ACK for a transport block in a state variable HARQ_FEEDBACK of the first HARQ process, based on an indication from the HARQ entity.
6. The communication method according to claim 5 , wherein
for FDD, a physical uplink shared channel (PUSCH) transmission corresponding to the second HARQ process is performed in a third subsequent subframe from a subframe in which the uplink grant has been received.
7. A communication method used for a base station apparatus, the communication method comprising:
a transmission step of transmitting a physical downlink control channel (PDCCH) including an uplink grant; and
a medium access control layer processing step of managing a hybrid automatic repeat request (HARQ) entity, wherein
the HARQ entity manages a first HARQ process and a second HARQ process in parallel,
in a case that the uplink grant is not indicated for the first HARQ process and a transmission time interval (TTI) and a HARQ buffer of the first HARQ process is not empty, the HARQ entity indicates to the first HARQ process to generate a non-adaptive retransmission, and
in a case that the non-adaptive retransmission of the first HARQ process collides with a transmission of the second HARQ process scheduled so as to use short processing time, the medium access control layer processing unit sets an ACK for a transport block in a state variable HARQ_FEEDBACK of the first HARQ process, based on an indication from the HARQ entity.
8. The communication method according to claim 7 , wherein
for FDD, a physical uplink shared channel (PUSCH) reception corresponding to the second HARQ process is performed in a third subsequent subframe from a subframe in which the uplink grant has been transmitted.