Distance measurement system and distancemeasurement method

A distance measurement method comprising:

• causing a control device to store information of a plurality of mobile devices to be a position determination target in a storage;
• causing the control device to prioritize the plurality of mobile devices in which the information is stored in the storage;
• causing the control device to notify a communication unit, configured to perform distance measurement communication with the plurality of mobile devices using a predetermined wireless protocol, of a priority of each mobile device;
• causing the communication unit or the control device to identify a distance measurement timing that is an execution timing of the distance measurement communication for each mobile device;
• causing the communication unit or the control device to determine whether a collision timing is present at which the distance measurement timing of the plurality of mobile devices overlaps;
• and
• causing the communication unit to perform the distance measurement communication with a high priority device,
• wherein
• the high priority device is a mobile device having a higher priority than a priority of a different mobile device among the plurality of mobile devices in a state where the distance measurement timing overlaps at the collision timing.

A distance measurement system comprising:

• an anchor configured to perform distance measurement communication with a plurality of mobile devices that includes at least one of (i) a first circuit and (ii) a first processor with a first memory storing first computer program code executable by the first processor and uses a predetermined wireless protocol;
• and
• a control device including at least one of (i) a second circuit and (ii) a second processor with a second memory storing second computer program code executable by the second processor, the at least one of the second circuit and the second processor configured to cause the control device to:
• store information of the plurality of mobile devices that are a position determination target in a storage
• prioritize the plurality of mobile devices, and
• provide notification indicating a priority of each mobile device, and the anchor is configured to or the control device is further caused to
• acquire a distance measurement timing that is a timing for performing the distance measurement communication with the plurality of mobile devices, and
• determine whether a collision timing is present at which the distance measurement timing of the plurality of mobile devices overlaps, and
• the anchor is configured to perform the distance measurement communication with a high priority device, and
• the high priority device is a mobile device having a higher priority than a priority of a different mobile device among the plurality of mobile devices in a state where the distance measurement timing overlaps at the collision timing.