Wireless communication terminal, wireless communication base station, wireless communication system, and reporting method

A wireless communication terminal comprising:

• a receiver which, in operation, receives from a wireless communication base station control information for restricting radio resources in an own cell or a neighbor cell to be measured;
• a controller which, in operation,
• receives a reference signal in the own cell or the neighbor cell, and performs a measurement on a downlink signal;
• and
• generates a radio link failure report including a result of the measurement;
• and
• a transmitter which, in operation, transmits the radio link failure report, wherein
• if the control information includes an instruction to restrict measurement of the own cell or the neighbor cell to a part of the radio resources, the controller generates the radio link failure report including a measurement result in the part of the radio resources of the own cell or the neighbor cell.

A wireless communication system including a wireless communication terminal and first and second wireless communication base stations, wherein

• the first wireless communication base station, in operation, transmits control information referred to by the wireless communication terminal in generating a report related to a measurement result of a communication cell provided by the first wireless communication base station,
• the wireless communication terminal includes:
• a receiver which, in operation, receives the control information;
• a controller which, in operation,
• monitors a state of a radio link with an own cell, which is a communication cell that is in connection with the wireless communication terminal;
• performs a measurement on a downlink signal in the communication cell provided by the first wireless communication base station;
• and
• generates a radio link failure report including a measurement result when a radio link failure occurs in the own cell;
• and
• a transmitter which, in operation, transmits the radio link failure report, wherein
• if the control information received from the first wireless communication base station includes an instruction to restrict measurement to a part of radio resources, after the radio link failure occurs the controller generates the radio link failure report including a measurement result in the part of radio resources, and
• the second wireless communication base station includes:
• a receiver which, in operation, receives from the wireless communication terminal, the radio link failure report including a measurement result restricted to the part of radio resources;
• and
• a controller which, in operation, determines whether or not the received radio link failure report includes a measurement restricted to the part of radio resources.

A wireless communication system including a wireless communication terminal and first and second wireless communication base stations, wherein

• the first wireless communication base station, in operation, transmits to the wireless communication terminal control information for restricting radio resources in an own cell or a neighbor cell to be measured by the wireless communication terminal, the own cell being provided by the first wireless communication base station,
• the wireless communication terminal includes:
• a receiver which, in operation, receives the control information;
• a controller which, in operation,
• receives a reference signal in the communication cell provided by the first wireless communication base station, and performs a measurement on a downlink signal;
• and
• generates a radio link failure report including a result of the measurement;
• and
• a transmitter which, in operation, transmits the radio link failure report, wherein
• if the control information received from the first wireless communication base station includes an instruction to restrict measurement of the own cell or the neighbor cell to a part of the radio resources, the controller generates the radio link failure report including a measurement result in the part of the radio resources of the own cell or the neighbor cell, and
• the second wireless communication base station includes:
• a receiver which, in operation, receives from the wireless communication terminal, the radio link failure report including a measurement result in the own cell or the neighbor cell, which is restricted to the part of the radio resources;
• and
• a controller which, in operation, determines whether or not the received radio link failure report includes a measurement result restricted to the part of radio resources.

A reporting method of a wireless communication terminal, the reporting method comprising:

• receiving control information for generating a report related to a measurement result of a communication cell provided by a wireless communication base station;
• monitoring a state of a radio link with an own cell, which is a communication cell that is in connection with the wireless communication terminal;
• performing a measurement on a downlink signal in the communication cell provided by the wireless communication base station;
• if the control information includes an instruction to restrict measurement to a part of radio resources, after a radio link failure occurs in the own cell, generating a radio link failure report including a measurement result in the part of radio resources;
• and
• transmitting the radio link failure report.

A reporting method of a wireless communication terminal, the reporting method comprising:

• receiving from a wireless communication base station control information for restricting radio resources in an own cell or a neighbor cell to be measured;
• receiving a reference signal in the own cell or the neighbor cell, and performing a measurement on a downlink signal;
• generating a radio link failure report including a result of the measurement;
• and
• transmitting the radio link failure report, wherein
• if the control information includes an instruction to restrict measurement of the own cell or the neighbor cell to a part of the radio resources, the radio link failure report is generated to include a measurement result in the part of the radio resources of the own cell or the neighbor cell.