| 摘要 |
The invention relates to an arrangement and method for establishing and maintaining a connection between users' communication devices via a public data network. Communication devices (MSA, MSB) belonging to users of a system are terminals of a telecommunication network, say mobile phones, and, in addition, they are adapted to make a link to a data network (210) via a wireless transfer system. Interfaced with the data network there is at least one server (220) that keeps a register of communication devices. A communication device brought near a data network terminal (DTA, DTB) reports itself to the server using a device-specific identifier. This reporting message also contains network address of said terminal. When a connect request arrives from a communication device via a terminal, the server provides for necessary network connection if the called device specified in the connect request can be reached. The connection may be a speech connection, for example. The server also draws conclusions about relative locations of terminals. On the basis of such "mapping" it makes, if possible, a handover from a terminal on the connection route, if the communication device moves during a connection so that the quality of the link between it and the terminal becomes significantly worse. The telecommunication network, the terminals of which the communication devices are, can also be used in the arrangement of a data network connection and also as a spare route for connections. |
