Radio wave map generator device, radio wave map provider device, and radio wave map acquiring device

A radio wave map provider device configured to receive a radio wave map request from a radio wave map acquiring device mounted in a moving body, and transmit required information, the radio wave map provider device comprising

• at least one of (i) a circuit and (ii) a processor with a memory storing computer program code executable by the processor, the at least one of the circuit and the processor configured to cause the radio wave map provider device to implement:
• a radio wave map storage unit configured to store
• reference position information indicating a reference position,
• a first communication speed that is a communication speed between a moving body and a first external communication device at the reference position,
• a second communication speed that is a communication speed between the moving body and a second external communication device at the reference position,
• a first connection probability that is a probability of performing wireless communication with the first external communication device at the reference position, and
• a second connection probability that is a probability of performing wireless communication with the second external communication device at the reference position;
• a receiving unit configured to receive the radio wave map request that contains request position information indicating a request position and usage information indicating a usage of the radio wave map;
• a minimum guaranteed speed calculation unit configured to select, as minimum guaranteed speed information, a smaller one of the first communication speed and the second communication speed for the reference position corresponding to the request position information when the usage information indicates real-time communication;
• an expected speed calculation unit configured to calculate, when the usage information indicates non-real-time communication other than the real-time communication, expected speed information that is an expected value of the communication speed using the first connection probability, the second connection probability, the first communication speed, and the second communication speed for the reference position corresponding to the request position information;
• and
• a transmission unit configured to transmit a radio wave map reply that contains the minimum guaranteed speed information or the expected speed information.

A radio wave map acquiring device mounted in a vehicle, the radio wave map acquiring device comprising

• at least one of (i) a circuit and (ii) a processor with a memory storing computer program code executable by the processor, the at least one of the circuit and the processor configured to cause the radio wave map acquiring device to implement:
• a request position information generating unit configured to determine a request position and generate request position information;
• a usage information generation unit configured to generate usage information indicating usage of a radio wave map;
• a transmission unit configured to transmit, to a radio wave map provider device, a radio wave map request that contains the request position information and the usage information;
• a receiving unit configured to receive, from the radio wave map provider device,
• a radio wave map reply that contains minimum guaranteed speed information for a reference position corresponding to the request position information when the usage information indicates real-time communication, and
• the radio wave map reply that contains expected speed information for the reference position corresponding to the request position information when the usage information indicates non-real-time communication other than the real-time communication;
• and
• a wireless communication unit configured to perform wireless communication with an external communication device based on the minimum guaranteed speed information contained in the radio wave map reply.

A radio wave map acquiring device mounted in a vehicle, the radio wave map acquiring device comprising

• at least one of (i) a circuit and (ii) a processor with a memory storing computer program code executable by the processor, the at least one of the circuit and the processor configured to cause the radio wave map acquiring device to implement:
• a request position information generating unit configured to determine a request position and generate request position information;
• a usage information generation unit configured to generate usage information indicating usage of a radio wave map;
• a transmission unit configured to transmit, to a radio wave map provider device, a radio wave map request that contains the request position information and the usage information;
• a receiving unit configured to receive, from the radio wave map provider device,
• a radio wave map reply that contains minimum guaranteed speed information for a reference position corresponding to the request position information when the usage information indicates real-time communication, and
• the radio wave map reply that contains expected speed information for the reference position corresponding to the request position information when the usage information indicates non-real-time communication other than the real-time communication;
• and
• a wireless communication unit configured to perform wireless communication with an external communication device based on the minimum guaranteed speed information and the expected speed information contained in the radio wave map reply.