Terminal and communication method for bandwidth configuration

A communication method executed by a terminal, the method comprising:

• receiving system information;
• and
• in a case where the received system information includes information related to a Supplementary Uplink, and a configuration of a first maximum bandwidth, from among one or more bandwidths for the Supplementary Uplink, is supported, configuring the first maximum bandwidth as a frequency bandwidth for communicating through the Supplementary Uplink and determines that the Supplementary Uplink is configured in a serving cell,
• wherein
• the configuration of the first maximum bandwidth is smaller than or equal to a carrierBandwidth indicated in the information related to the Supplementary Uplink for subcarrier spacing of an initial uplink Bandwidth Part (BWP), and
• the configuration of the maximum bandwidth is wider than or equal to a bandwidth of the initial uplink BWP,
• a frequency bandwidth for performing downlink communication is based on a value indicated by four most significant bits of PDCCH-ConfigSIB1 until reception of RRCSetup or RRCResume or RRCRestablishment, and
• the carrierBandwidth is specified based on an information element indicating a location of a direct current of a carrier and a subcarrier spacing of the carrier.

A radio communication system comprising:

• a base station;
• and
• a terminal,
• wherein the base station includes a transmitter that transmits system information to the terminal, and
• wherein the terminal includes:
• a receiver that receives the system information;
• and
• a processor,
• wherein
• in a case where the system information received by the receiver includes information related to a Supplementary Uplink, and a configuration of a maximum bandwidth, from among one or more bandwidths for the Supplementary Uplink, is supported, the processor configures the maximum bandwidth as a frequency bandwidth for communicating through the Supplementary Uplink and determines that the Supplementary Uplink is configured in a serving cell,
• the configuration of the maximum bandwidth is smaller than or equal to a carrierBandwidth indicated in the information related to the Supplementary Uplink for subcarrier spacing of an initial uplink Bandwidth Part (BWP), and the configuration of the maximum bandwidth is wider than or equal to a bandwidth of the initial uplink BWP,
• a frequency bandwidth for performing downlink communication is based on a value indicated by four most significant bits of PDCCH-ConfigSIB1 until reception of RRCSetup or RRCResume or RRCRestablishment, and
• the carrierBandwidth is specified based on an information element indicating a location of a direct current of a carrier and a subcarrier spacing of the carrier.