Communication device, communication system and associated communication method

A communication system, comprising:

• a first communication device, placed at a first moving device, configured to detect a movement of the first moving device at a first time point to obtain at least one first movement parameter, detect the movement of the first moving device at a second time point to obtain at least one second movement parameter, and transmit the at least one second movement parameter selectively according to whether or not a difference between an estimated internal movement parameter and the at least one second movement parameter is greater than a predefined threshold, wherein the first communication device estimates a position of the first moving device at the second time point based on the at least one estimating function and the at least one first movement parameter and accordingly obtains the estimated internal movement parameter, wherein the second time point is later than the first time point;
• and
• a second communication device of a second moving device, configured to receive and store the at least one first movement parameter, and obtain the movement of the first moving device at the second time point according to either the at least one second movement parameter or an estimated external movement parameter, wherein the second communication device estimates the position of the first moving device at the second time point based on at least one estimating function and the at least one first movement parameter and accordingly obtains the estimated external movement parameter.

A communication device placed at a first moving device, comprising:

• a movement detecting module, configured to detect a movement of the first moving device to obtain at least one first movement parameter at a first time point, and detect the movement of the first moving device to obtain at least one second movement parameter at a second time point, wherein the second time point is later than the first time point;
• a transmitter, configured to transmit the at least one first movement parameter;
• and
• a controller, configured to estimate a position of the first moving device at the second time point based on at least one first estimating function and the at least one first movement parameter, and accordingly obtain an estimated internal movement parameter, wherein the controller controls the transmitter to transmit the at least one second movement parameter selectively according to whether or not a difference between the estimated internal movement parameter and the at least one second movement parameter is greater than a predefined threshold,
• wherein the transmitted at least one first movement parameter and the transmitted at least one second movement parameter are received by another communication device of a second moving device to estimate the position of the first moving device and obtain the movement of the first moving device at the second time point.