| 摘要 |
In a telecommunications system, a mobile terminal (20) transmits a request for navigation assistance (RNAM) message over an air interface (33) to a mobile telecommunications network. In response to the request, a navigation assistance node (22) uses information related to a current geographical position of the mobile terminal to prepare a navigation assistance message (NAM) which is transmitted to the mobile terminal. The navigation assistance message includes information indicating a suggested navigation plan. The information related to the current geographical position of the mobile terminal, which is used by the navigational assistance node to prepare the navigational assistance message can be obtained in several ways, e.g., GPS coordinate data or parameter(s) of the mobile telecommunications network employed for servicing the mobile terminal. The navigational assistance node consults a geographical location database (40) to obtain e.g., direction and distance information, for preparing the navigation assistance message. The navigational assistance node (22) can be a node of a mobile telecommunications network or node of a fixed or wired telecommunications network which is connected through a gateway node or the like to a mobile telecommunications network. In one mode of the invention, the navigational assistance node provides a track back service which generates a navigational assistance message (NAM) for enabling the user of the mobile terminal to return to a former current geographical location. |
