| CPC H04W 64/006 (2013.01) [H04W 4/027 (2013.01); H04W 52/02 (2013.01)] | 5 Claims |
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1. A communication device comprising:
a GPS receiver configured to receive position information of the communication device;
an acceleration sensor configured to detect movement of the communication device held by a user and to provide a detection signal;
a communication interface configured to communicate with a communication system using LPWA;
a memory configured to store a program; and
a processor configured to execute the program so as to:
receive the position information and the detection signal;
determine whether the communication device is moving based on the position information and the detection signal;
communicate with the communication system at a first communication speed via the communication interface when the processor determines that the communication device is not moving;
determine whether a periodic component is contained in the detection signal, wherein the periodic component corresponds to a plurality of landing impacts of a foot of the user due to the movement caused by walking of the user; and
communicate with the communication system at a second communication speed via the communication interface when the processor determines that the periodic component is contained in the detection signal,
wherein the second communication speed is higher than the first communication speed,
an impact interval between two adjacent landing impacts of the plurality of landing impacts is shorter than a first period of time to send one frame of a positioning signal corresponding to the position information from the communication device to the communication system at the first communication speed, and
the impact interval is longer than a second period of time to send the one frame of the positioning signal from the communication device to the communication system at the second communication speed.
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