User equipment and radio base station

1. A terminal comprising:

a transmitting unit that transmits a request signal for requesting a radio base station to transmit a reference time, to the radio base station; and

a receiving unit that receives a radio resource control message from the radio base station according to the transmission of the request signal, the radio resource control message including a reference system frame number and the reference time associated with the reference system frame number,

wherein the reference time corresponds to a time at a terminal boundary of a system frame indicated by the reference system frame number.

2. The terminal according to claim 1 , wherein the reference time is a reference time applied in a 5G system.

3. The terminal according to claim 1 , wherein the radio resource control message is DLInformation Transfer.

4. A radio base station comprising:

a receiving unit that receives a request signal for requesting the radio base station to transmit a reference time, from a terminal;

a control unit that configures a radio resource control message including a reference system frame number and the reference time associated with the reference system frame number, according to the reception of the request signal; and

a transmitting unit that transmits the configured radio resource control message to the terminal, wherein the reference time corresponds to a time at a terminal boundary of a system frame indicated by the reference system frame number.

5. A radio base station comprising:

a first communication device; and

a second communication device that is connected to the first communication device and controls the first communication device, wherein

the second communication device includes a transmitting unit that transmits a request signal for requesting the first communication device to transmit a reference time, to the first communication device, and

the first communication device includes:

a receiving unit that receives the request signal;

a control unit that configures a radio resource control message including a reference system frame number and the reference time associated with the reference system frame number, according to the reception of the request signal; and

a transmitting unit that transmits the configured radio resource control message, wherein the reference time corresponds to a time at a terminal boundary of a system frame indicated by the reference system frame number.

6. A radio communication method comprising:

transmitting, by a terminal, a request signal for requesting a radio base station to transmit a reference time, to the radio base station;

configuring, by the radio base station, a radio resource control message including a reference system frame number and the reference time associated with the reference system frame number, according to the reception of the request signal; and

transmitting, by the radio base station, the configured radio resource control message to the terminal, wherein the reference time corresponds to a time at a terminal boundary of a system frame indicated by the reference system frame number.

7. A radio communication system comprising:

a terminal that transmits a request signal for requesting a transmission of a reference time; and

a radio base station that receives the request signal, wherein

the radio base station includes:

a receiving unit that receives the request signal;

a control unit that configures a radio resource control message including a reference system frame number and the reference time associated with the reference system frame number, according to the reception of the request signal; and

a transmitting unit that transmits the configured radio resource control message to the terminal wherein the reference time corresponds to a time at a terminal boundary of a system frame indicated by the reference system frame number.