Communication system, base station, user equipment, communication method, and recording medium

A base station configured to communicate with user equipment, the base station comprising:

• a receiver configured to receive, in an uplink, a buffer status report for identifying an amount of uplink data buffered by the user equipment;
• a transmitter configured to transmit, in a downlink, grant information for allocating a radio resource for the uplink data;
• and
• a processor configured to control the transmitter to stop transmission of the grant information when the buffer status report indicates stopping transmission of the grant information by the base station.

User equipment comprising:

• a buffer configured to buffer uplink data;
• a transmitter configured to transmit, in an uplink, a buffer status report for identifying an amount of uplink data buffered in the buffer;
• a receiver configured to receive, in a downlink, grant information for allocating a radio resource to the user equipment;
• and
• a processor configured to control the transmitter, based on an amount of uplink data buffered in the buffer, in a way such that the buffer status report includes information indicating stopping of transmission of the grant information.

A communication method for a base station, the method comprising:

• receiving, in an uplink, a buffer status report for identifying an amount of uplink data buffered by user equipment;
• transmitting, in a downlink, grant information for allocating a radio resource for the uplink data;
• and
• stopping transmission of the grant information when the buffer status report indicates stopping of transmission of the grant information by the base station.

A non-transitory computer recording medium that stores a program for causing a computer to execute a communication method for a base station, the method comprising:

• receiving, in an uplink, a buffer status report for identifying an amount of uplink data buffered by user equipment;
• transmitting, in a downlink, grant information for allocating a radio resource for the uplink data;
• and
• stopping transmission of the grant information when the buffer status report indicates stopping of transmission of the grant information by the base station.