BASE STATION, REPEATER, TERMINAL, AND WIRELESS COMMUNICATION SYSTEM
A base station includes: radio frequency circuitry; and processor circuitry coupled to the radio frequency circuitry, the processor circuitry being configured to perform processing including: a transmission process that includes transmitting a first signal in a radio resource control (RRC) layer to a communication device via the radio frequency circuitry; and a control process that includes taking control to determine, based on whether or not the communication device is of a particular type, whether or not to transmit a second signal in the RRC layer to the communication device after the first signal.
1 . A base station comprising:
radio frequency circuitry; and
processor circuitry coupled to the radio frequency circuitry, the processor circuitry being configured to perform processing including:
a transmission process that includes transmitting a first signal in a radio resource control (RRC) layer to a communication device via the radio frequency circuitry; and
a control process that includes taking control to determine, based on whether or not the communication device is of a particular type, whether or not to transmit a second signal in the RRC layer to the communication device after the first signal.
2 . The base station according to claim 1 , wherein
the control process includes taking control to transmit the second signal when determining that the communication device is of a first type.
3 . The base station according to claim 1 , wherein
the control process includes taking control not to transmit the second signal when determining that the communication device is of a second type.
4 . The base station according to claim 3 , the processing further comprising
a reception process that includes receiving, from the communication device via the radio frequency circuitry, a third signal that includes class information that indicates whether or not the communication device is of the second type, wherein
the control process includes controlling whether or not to transmit the second signal, according to the class information.
5 . The base station according to claim 4 , wherein
the class information is a Media Access Control Control Element (MAC CE) included in the third signal or information included in uplink control information.
6 . The base station according to claim 4 , wherein
the first signal is a security mode command message,
the second signal is an RRC reconfiguration message that includes a Secondary Cell (SCell) addition setting, and
the third signal is an RRC setup complete message.
7 . The base station according to claim 4 , wherein
the first signal is an RRC setup message,
the second signal is a security command message, and
the third signal is an RRC setup complete message.
8 . The base station according to claim 4 , wherein
the control process includes determining, based on a bearer to which the third signal is transmitted, whether or not the communication device is of the particular type.
9 . The base station according to claim 1 , wherein
the first signal is an RRC setup message, and
the second signal is a security command message.
10 . The base station according to claim 1 , wherein
the control process includes determining that the communication device is of a second type in a case where a response signal to the first signal is not received from the communication device.
11 . The base station according to claim 3 , wherein
the control process includes taking control to transmit a fourth signal in the RRC layer to the communication device when determining that the communication device is of the second type, and
the fourth signal is an RRC reconfiguration message that does not include an SCell addition setting.
12 . A repeater in a communication device that relays communication between a base station and a terminal,
the repeater comprising:
radio frequency circuitry; and
processor circuitry coupled to the radio frequency circuitry, the processor circuitry being configured to perform processing including:
a control process including controlling a configuration of a radio resource control (RRC) connection configured with the base station; and
a reception process including: receiving, using the radio frequency circuitry, a first signal in an RRC layer and a second signal in the RRC layer transmitted from the base station in a case where the base station determines that the communication device is of a first type, and receiving, using the radio frequency circuitry, the first signal transmitted from the base station in a case where the base station determines that the communication device is of a second type.
13 . The repeater according to claim 12 , wherein
the control process includes taking control not to configure at least one of a signaling radio bearer (SRB) 2 or a data radio bearer (DRB) when configuring the RRC connection.
14 . A terminal configured to receive a signal transmitted from a base station via a repeater, the terminal comprising:
radio frequency circuitry; and
processor circuitry coupled to the radio frequency circuitry, the processor circuitry being configured to perform processing including:
a reception process that includes receiving, from the repeater via the radio frequency circuitry, the signal transmitted by the base station, the repeater being configured to take control to receive a first signal in a radio resource control (RRC) layer and a second signal in the RRC layer transmitted from the base station in a case where the base station determines that the repeater is of a first type, and to receive the first signal transmitted from the base station in a case where the base station determines that the repeater is of a second type; and
a control process that includes performing signal processing on the received signal.