| 摘要 |
<p>A GSM mobile telecommunications network provides a radio access network, comprising base transceiver stations 22 and base station controllers 26, together with a core network, comprising mobile switching centres 2, serving gateway support nodes 16, core 12 and home location register 10. The radio access network comprises a plurality of geographically distributed cells. The network provides GSM functions to mobile devices registered therewith over a GSM bearer. The network is adapted to also provide core network GSM functions to devices registered therewith over a non-GSM bearer via a different access network. This different access network may comprise a Bluetooth (RTM) connection between the mobile terminal and an access point 20, and an IP-based communications link between the access point 20 and an access controller 24. The telecommunications network further includes GMLC 30 and SMLC 25 in order to provide information indicative of the location of mobile terminals for providing location based services thereto. When the GMLC 30 receives a request for the location of one of the mobile terminals, the SMLC 28 is interrogated to obtain therefrom, if available, data indicative of the location of the relevant mobile terminal. The mobile terminal may be caused to selectively switch between the GSM radio access network and the other access network if no location information is derivable from one of the access networks currently used by the device.</p> |
