Wireless communication system and wireless communication method

A wireless communication system comprising:

• a first base station device;
• a first wireless terminal device;
• and
• a base station management device, wherein
• the first base station device includes:
• a first memory;
• and
• a first processor coupled to the first memory and configured to:
• when the first wireless terminal device selects a second base station as a serving base station device, acquire identification information of a plurality of base station devices including the first base station device, which are capable of communicating with the first wireless terminal device;
• transmit the identification information of the plurality of base station devices to the base station management device;
• receive communication load of each of the plurality of base station devices from the base station management device;
• calculate a throughput of each of the plurality of base station devices using the communication load;
• assign priority levels to the plurality of base station devices based on the calculated throughputs;
• transmit the priority levels and the identification information of each of the plurality of base station devices to the first wireless terminal device;
• and
• change the serving base station device of the first wireless terminal device to the second base station device which is selected from the plurality of base station devices and which the first base station device is notified of by the first wireless terminal device;
• the base station management device includes:
• a second memory;
• and
• a second processor coupled to the second memory and configured to notify the first base station device of the identification information of the plurality of base station devices and the communication load of each of the plurality of base station devices;
• and
• the first wireless terminal device includes:
• a third memory;
• and
• a third processor coupled to the third memory and configured to:
• receive the priority levels and the identification information of each of the plurality of base station devices;
• and
• notify the first base station device of the identification information of the second base station device selected from the plurality of base station devices based on the priority levels and the identification information.

A wireless communication method using a wireless communication system including a first base station device and a first wireless terminal device, the method being executed by the first base station device, the method comprising:

• acquiring identification information of the plurality of base station devices including the first base station device, which are capable of communicating with the first wireless terminal device;
• acquiring communication load of each of the plurality of base station devices by the first base station device;
• calculating a throughput of each of the plurality of base station devices using the communication load;
• assigning priority levels to the plurality of base station devices based on the calculated throughputs;
• transmitting the priority levels and the identification information of each of the plurality of base station devices to the first wireless terminal device by the first base station device;
• receiving, from the first wireless terminal device, a notification indicating the identification information of a second base station device selected from the plurality of base station devices based on the priority levels and the identification information;
• and
• changing a serving base station device of the first wireless terminal device to the second base station device.

A first base station comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• acquire identification information of a plurality of base station devices including the first base station device, the plurality of base station devices being capable of communicating with a wireless terminal device;
• acquire communication load of each of the plurality of base station devices;
• calculate a throughput of each of the plurality of base station devices using the communication load;
• assign priority levels to the plurality of base station devices based on the calculated throughputs;
• transmit, to the wireless terminal device, the priority levels and the identification information of each of the plurality of base station devices;
• receive, from the wireless terminal device, a notification indicating the identification information of a second base station device selected from the plurality of base station devices based on the priority levels and the identification information;
• and
• change a serving base station device of the wireless terminal device to the second base station device.

A wireless terminal device comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• acquire, from a first base station device, identification information and priority levels of a plurality of base station devices including the first base station device, the priority levels being calculated based on throughputs of the plurality of base station devices, the plurality of base station devices being capable of communicating with the wireless terminal device;
• select a second base station device from among the plurality of base station devices based on the priority levels and the identification information;
• and
• transmit, to the first base station device, a notification indicating the selected second base station device, wherein
• the first base station device changes a serving base station device of the wireless terminal device to the second base station device based on the notification.