Terminal apparatus, base station apparatus, and communication method

A base station apparatus comprising:

• a transmitter configured to transmit a Physical Downlink Control CHannel (PDCCH) with a Downlink Control Information (DCI) format on an active downlink BandWidth Part (BWP) in a serving cell, the DCI format being used for scheduling a Physical Downlink Shared CHannel (PDSCH), and transmit the PDSCH on the active downlink BWP;
• and
• a receiver configured to receive a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) on a Physical Uplink Control CHannel (PUCCH), wherein
• a value NRIV of a frequency domain resource allocation field included in the DCI format is equal to NsizeBWP*(LRBs−1)+RBstart, in a case that LRBs−1 is equal to or smaller than floor(NsizeBWP/2),
• the value NRIV is equal to NsizeBWP*(NsizeBWP−LRBs+1)+(NsizeBWP−1−RBstart) in a case that LRBs−1 is larger than floor(NsizeBWP/2),
• the floor(NsizeBWP/2) is a largest integer within a range that does not exceed the NsizeBWP/2,
• the RBstart is a starting resource block for allocation of the PDSCH,
• the LRBs is a number of allocated resource blocks for the PDSCH,
• the NsizeBWP is given based on whether or not a control resource set with an index O is configured,
• the NsizeBWP is given based on a number of resource blocks for an initial downlink BWP configured by a first parameter in a case that the control resource set with the index O is not configured and the DCI format is detected in a common search space, and
• the NsizeBWP is given based on a number of resource blocks for the control resource set with the index O in a case that the control resource set with the index O is configured by a second parameter different from the first parameter and the DCI format is detected in the common search space.

A communication method used for a terminal apparatus, the communication method comprising:

• monitoring a Physical Downlink Control CHannel (PDCCH) with a Downlink Control Information (DCI) format on an active downlink BandWidth Part (BWP) in a serving cell, the DCI format being used for scheduling a Physical Downlink Shared CHannel (PDSCH);
• receiving the PDSCH on the active downlink BWP;
• and
• transmitting a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) on a Physical Uplink Control CHannel (PUCCH), wherein
• a value NRIV of a frequency domain resource allocation field included in the DCI format is equal to NsizeBWP*(LRBs−1)+RBstart, in response to LRBs−1 being equal to or smaller than floor(NsizeBWP/2),
• the value NRIV is equal to NsizeBWP*(NsizeBWP−LRBs+1)+(NsizeBWP−1−RBstart) in response to LRBs−1 being larger than floor(NsizeBWP/2),
• the floor(NsizeBWP/2) is a largest integer within a range that does not exceed the NsizeBWP/2,
• the RBstart is a starting resource block for allocation of the PDSCH,
• the LRBs is a number of allocated resource blocks for the PDSCH,
• the NsizeBWP is given based on whether or not a control resource number of resource set with an index O is configured,
• the NsizeBWP is given based on a number of resource blocks for an initial downlink BWP configured by a first parameter in response to the control resource set with the index O being not configured and the DCI format being detected in a common search space, and
• the NsizeBWP is given based on a number of resource blocks for the control resource set with the index O in response to the control resource set with the index O being configured by a second parameter different from the first parameter and the DCI format is being detected in a common search space.