Terminal apparatus, base station apparatus, and communication method

A base station apparatus configured to communicate with a terminal apparatus in a serving cell, the base station apparatus comprising:

• Radio Resource Control (RRC) layer processing circuitry and transmission circuitry, wherein
• the RRC processing circuitry is configured to inform the terminal apparatus of a downlink (DL) bandwidth part, in the serving cell, by using first system information, the DL bandwidth part being set to an active DL bandwidth part, and
• the RRC processing circuitry is further configured to inform the terminal apparatus of a control resource set in the serving cell by using a Master Information Block (MIB);
• and
• the transmission circuitry is configured to transmit a first Physical Downlink Control Channel (PDCCH) with a first Downlink Control Information (DCI) format in the active DL bandwidth part, and configured to transmit a second PDCCH with a second DCI format in the active DL bandwidth part, wherein
• the transmission circuitry is configured to calculate a first number of bits of a first resource assignment field for a first Physical Downlink Shared Channel (PDSCH) in the first DCI format based on a number of resource blocks specifying a first frequency bandwidth for the active DL bandwidth part,
• the transmission circuitry is further configure to calculate a second number of bits of a second resource assignment field for a second PDSCH in the second DCI format based on a number of resource blocks specifying a second frequency bandwidth for the control resource set, and;
• the transmission circuitry is further configured to transmit, on the control resource set, a third PDCCH to be used for scheduling the first system information.

A communication method for a terminal apparatus configured to communicate with a base station apparatus in a serving cell, the communication method comprising:

• configuring, in the serving cell, a downlink (DL) bandwidth part by first system information, the DL bandwidth part being set to an active DL bandwidth part;
• configuring, in the serving cell, a control resource set based on a Master Information Block (MIB);
• monitoring a first Physical Downlink Control Channel (PDCCH) with a first Downlink Control Information (DCI) format in the active DL bandwidth part;
• and
• monitoring a second PDCCH with a second DCI format in the active DL bandwidth part, wherein
• calculating a first number of bits of a first resource assignment field for a first Physical Downlink Shared Channel (PDSCH) in the first DCI format based on a number of resource blocks specifying a first frequency bandwidth for the active DL bandwidth part,
• calculating a second number of bits of a second resource assignment field for a second PDSCH in the second DCI format based on a number of resource blocks specifying a second frequency bandwidth for the control resource set, and
• the communication method further comprises monitoring, on the control resource set, a third PDCCH to be used for scheduling the first system information.

A communication method for a base station apparatus configured to communicate with a terminal apparatus in a serving cell, the communication method comprising:

• informing the terminal apparatus of a downlink (DL) bandwidth part in the serving cell by using first system information, the DL bandwidth part being set to an active DL bandwidth part;
• informing the terminal apparatus of a control resource set in the serving cell by using a Master Information Block (MIB);
• transmitting a first Physical Downlink Control Channel (PDCCH) with a first Downlink Control Information (DCI) format in the active DL bandwidth part;
• and
• transmitting a second PDCCH with a second DCI format in the active DL bandwidth part, wherein
• calculating a first number of bits of a first resource assignment field for a first Physical Downlink Shared Channel (PDSCH) in the first DCI format based on a number of resource blocks specifying a first frequency bandwidth for the active DL bandwidth part,
• calculating a second number of bits of a second resource assignment field for a second PDSCH in the second DCI format based on a number of resource blocks specifying a second frequency bandwidth for a control resource set, and
• the communication method further comprises transmitting, on the control resource set, a third PDCCH to be used for scheduling the first system information.