Nokia Corporation

Tapio Siik

Markku Matias Rautiola

Hannu Honkala

Roy Mickos

Petri Uosukainen

Pekka Rissanen

Kai Närvänen

Timo Hänninen

Jari Pekka Rissanen

Timo Hanninen

A method () for carrying out a security procedure with a mobile station, where a hybrid cellular telecommunication system communicates with a mobile station () and the hybrid cellular telecommunication system communicates with a cellular network (). The method is characterized in that the cellular network carries out the security procedure with the mobile station, the data related to the security procedure is transferred between the cellular network and the mobile station via the hybrid cellular telecommunication system, and the decision of triggering the security procedure of the cellular network is made outside the cellular network (). The invention also relates to a network element () in the hybrid cellular telecommunication system that triggers the security procedure and to a network element () in the cellular network that carries out the security procedure after receiving a triggering signal.

Method and device for carrying out security procedures involving mobile stations in hybrid cellular telecommunication systems

A network for communicating with a plurality of radiotelephones via respective communication channels over timeslots on a carrier, wherein the channels can operate at a first or second data rate such that a timeslot on the carrier can transmit a single communication channel operating at the first data rate or two communication channels operating at the second data rate, the network comprising a controller responsive to a predetermined condition for initiating a change in the data rate of two channels transmitted on separate timeslots from the first data rate to the second data rate.

Communication network

A method of handing off a mobile station (MS B) from an internal cellular communications network to an external cellular communications network having a network controller, the method comprising: allocating at least one cell of the internal cellular network as a border cell (E); detecting the movement of said mobile station (MS B) into said border cell (E); generating an advance hand-off request in accordance with a prediction algorithm which uses a set of predetermined parameters associated with said mobile station (MS B) and determines when a hand-off is likely to be required; and responsive to said advance hand-off request setting up a communication channel in the external cellular communications network for use by said mobile station (MS B) when an actual hand-off request is made, wherein said external network and said internal network is a packet switched network.

Handover of a mobile station from an internal cellular communication system to an external cellular communication system

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Espoo, Finland

Tapio Siik