Method for transferring the context of a mobile terminal in a wireless telecommunication network
The present invention concerns a method for obtaining a context of a mobile terminal ( 30 ) which is expecting to be served by a first base station ( 10 b ) of a wireless telecommunication network comprising a plurality of base stations ( 10 ) linked together by a telecommunication network. The first base station which is expected to serve the mobile terminal, receives a first message from the mobile terminal ( 30 ) through a wireless interface, the message comprising at least an identifier of the mobile terminal ( 30 ) and an identifier of a second base station ( 10 a ), transfers through the telecommunication network ( 50 ) a second message to the second base station ( 10 a ) of which the identifier is comprised in the received message, receives through the telecommunication network a third message from the second base station, the third message message comprising the context of the mobile terminal.
1. A method for requesting a base station to serve a mobile terminal, the base station being a base station of a wireless telecommunication network, the mobile terminal being served by another base station of the wireless telecommunication network, wherein the method, executed by the mobile terminal which requests to be served by the base station, comprises:
receiving from the base station by which the mobile terminal is currently being served, a first message comprising at least an identifier of the base station by which the mobile terminal is currently being served, and an identifier of the mobile terminal;
transferring to the base station the mobile terminal requests to be served by, a second message comprising at least the identifier of the base station by which the mobile terminal is currently being served, and the identifier of the mobile terminal;
selecting third base stations;
memorizing the identifiers of the selected base stations; and
configuring the mobile terminal in a first state wherein the transfer of signals is interrupted, wherein,
the second message comprises the identifiers of the base stations ordered according to the order of which the mobile terminal has selected the base stations, and
the third base stations are selected when the mobile terminal is configured in the state wherein the transfer of signals is interrupted.
2. The method according to claim 1 , wherein the first message comprises a certificate which comprises the identifier of the mobile terminal, the identifier of the base station and a signature obtained by encoding the identifiers by the private key of the base station the mobile terminal is currently being served.
3. The method according to claim 2 , wherein the second message comprises a certificate which comprises the identifier of the mobile terminal, the identifier of the base station and a signature obtained by encoding the identifiers by the private key of the other base station and/or a signature obtained by encoding the identifiers by the private key of the mobile terminal.
4. The method according to claim 3 , wherein the method further comprises:
receiving from the base station which is requested to serve the mobile terminal, a third message comprising at least an identifier of the base station which is requested to serve the mobile terminal and an identifier of the mobile terminal.
5. The method according to claim 1 , wherein the method further comprises:
determining the number of selected third base stations; and
configuring the mobile terminal in a second state in which the transfer of signals is enabled if the determined number is equal to a predetermined value.
6. The method according to claim 5 , wherein the second message is transferred once the mobile terminal is configured in the second state.
7. A device for requesting a base station to serve a mobile terminal, the base station being a base station of a wireless telecommunication network, the mobile terminal being served by another base station of the wireless telecommunication network, wherein the device is comprised in the mobile terminal which requests to be served by the base station, and comprises:
a device configured to receive from the base station by which the mobile terminal is currently being served at least an identifier of the base station the mobile terminal is currently being served and an identifier of the mobile terminal;
a device configured to transfer to the base station the mobile terminal requests to be served by, a message comprising at least the identifier of the base station by which the mobile terminal is currently being served and the identifier of the mobile terminal;
a device configured to select third base stations;
a device configured to memorize the identifiers of the selected base stations; and
a device configured to configure the mobile terminal in a first state wherein the transfer of signals is interrupted, wherein,
the second message comprises the identifiers of the base stations ordered according to the order of which the mobile terminal has selected the base stations, and
the third base stations are selected when the mobile terminal is configured in the state wherein the transfer of signals is interrupted.
8. A non-transitory computer readable media which can be directly loadable into a programmable device, comprising instructions or portions of code for implementing the method according to any of claim 1 to 4 , 5 , 6 or 7 , when said instructions or portions of code are executed on the programmable device.