1. Field of the Invention
The present invention relates to a communication technology and, more particularly, to a terminal device, base station device, communication system, and communication method adapted to transmit location information.
2. Description of the Related Art
The current location of a terminal device of a cell phone system is retrieved so that services adapted to the area including the current location are provided. For example, a terminal device periodically retrieves information indicating the current location of the device using a Global Positioning System (GPS) and transmits the location information to a server device. The server device determines an area in which the terminal device is located based on the received location information. In order to prevent an increase in the traffic for transmission of the location information, the server device transmits area information in advance. If the retrieved location information is included in a range indicated by the area information, the terminal device stops transmitting the location information (see, for example, patent document 1).
[patent document 1] JP2009-89092
Where area information is transmitted to control transmission from a terminal device, the larger the number of areas for which transmission should be controlled, the larger the number of items of area information, i.e., the data size. Also, transmission for a given area should be controlled in some cases but need not be controlled in other cases. Transmission of area information to suit different cases also increases the data size and traffic.