Communication terminal, sensing device, and server

A sensing device of a plurality of sensing devices, the sensing device comprising:

• a sensor configured to measure a surrounding environment and generate sensed data of the sensor;
• and
• circuitry configured to:
• generate a packet signal that includes a public area and a private area separated from the public area, wherein the public area is not encrypted and includes attribute information on the sensing device associated with the sensed data, the private area includes the sensed data of the sensor, and the sensed data is encrypted in the private area;
• and
• transmit, at a determined period, the packet signal to a communication terminal, wherein the communication terminal predicts a position of the communication terminal based on a direction of movement of the communication terminal, sends a request comprising the predicted position to a server to obtain specific attribute information on the plurality of sensing devices around the predicted position of the communication terminal, receives the specific attribute information on the plurality of sensing devices transmitted from the server, and controls display of an icon corresponding to each sensing device of the plurality of sensing devices on a map based on the received specific attribute information, wherein the specific attribute information includes at least a position of each sensing device of the plurality of sensing devices.

A server, comprising:

• circuitry configured to:
• store attribute information on a plurality of sensing devices in a memory, wherein the attribute information comprises information regarding an arrangement position of the plurality of sensing devices and the attribute information is received in a packet signal transmitted from each sensing device of the plurality of sensing devices around a communication terminal, wherein the packet signal comprises a public area and a private area separated from the public area, the public area is not encrypted and comprises the attribute information on the plurality of sensing devices that generate sensed data, the private area comprises the sensed data of the plurality of sensing devices, and the sensed data is encrypted in the private area;
• receive, from the communication terminal, an obtaining request that is requested to obtain the attribute information, wherein the obtaining request comprises a predicted position of the communication terminal based on a direction of movement of the communication terminal;
• and
• transmit, based on the predicted position of the communication terminal in the obtaining request, a frame that comprises information on surrounding sensing devices around the predicted position of the communication terminal among the plurality of sensing devices, and specific attribute information on the surrounding sensing devices among the attribute information stored in the memory, wherein the specific attribute information comprises at least a position of each of the surrounding sensing devices.