Base station device, program, flying body, and control method

A non-transitory computer readable medium that stores a program which causes a computer to function as:

• a storage unit that stores a neighbor relation table;
• a scheme selection unit that selects a scheme of HO from a first scheme not using the neighbor relation table and a second scheme using the neighbor relation table when receiving a measurement report for HO from a user terminal;
• and
• an HO control unit that, when the first scheme is selected, causes the user terminal to measure system information of an HO candidate cell, receives, from the user terminal, a cell global identifier included in the system information, and controls HO of the user terminal by using cell information of the HO candidate cell received from a core network by using the cell global identifier, and
• when the second scheme is selected, determines whether a physical cell identifier of the HO candidate cell is included in the neighbor relation table, when the physical cell identifier is included, controls the HO of the user terminal by using cell information corresponding to the physical cell identifier, and when the physical cell identifier is not included, causes the user terminal to measure the system information of the HO candidate cell, receives, from the user terminal, the cell global identifier included in the system information, controls the HO of the user terminal by using the cell information of the HO candidate cell received from the core network by using the cell global identifier, and registers the cell information in the neighbor relation table.

A control method executed by a base station device, comprising:

• selecting a scheme of HO from a first scheme not using a neighbor relation table stored in a storage unit of the base station device and a second scheme using the neighbor relation table when receiving a measurement report for HO from a user terminal;
• and
• controlling the HO by, when the first scheme is selected in the selecting the scheme, causing the user terminal to measure system information of an HO candidate cell, receiving, from the user terminal, a cell global identifier included in the system information, and controlling HO of the user terminal by using cell information of the HO candidate cell received from a core network by using the cell global identifier, and
• when the second scheme is selected in the selecting the scheme, determining whether a physical cell identifier of the HO candidate cell is included in the neighbor relation table, when the physical cell identifier is included, controlling the HO of the user terminal by using cell information corresponding to the physical cell identifier, and when the physical cell identifier is not included, causing the user terminal to measure the system information of the HO candidate cell, receiving, from the user terminal, the cell global identifier included in the system information, controlling the HO of the user terminal by using the cell information of the HO candidate cell received from the core network by using the cell global identifier, and registering the cell information in the neighbor relation table.