Mobile communication system and a method for connecting a remote workstation to a data communication network via a mobile communication network

A method for connecting a remote workstation to a data network via a digital mobile communication network, comprising the steps of:

• starting a data session from said remote workstation;
• establishing a digital data connection over a radio path between said remote workstation and an interconnecting computer connected to said data network by a digital interface in said mobile communication network for said data session;
• extending said digital data connection between said mobile communication network and said data network by said interconnecting computer in order to establish a digital end-to-end connection between said mobile data unit and any other party in said data network;
• and
• temporarily releasing said digital data connection in said mobile communication network during said data session, and, when said digital data connection has been temporarily released:
• a) maintaining said digital data connection extended towards said data network by said interconnected computer;
• b) simulating operation of said remote workstation towards said data network at said interconnected computer;
• and
• c) monitoring communication addressed from said data network to said remote workstation at said interconnected computer, and upon sensing existence of a communication addressed from said data network to said remote workstation transmitting a notification to said remote workstation over said radio path by sending a connectionless message transmission.

A mobile communication system, comprising:

• a mobile data unit acting via a digital mobile communication network as a remote workstation in a data network;
• a mobile exchange;
• and
• an interconnecting computer attached to said mobile exchange, the interconnecting computer being connected to said data network by a digital interface and arranged for extending said digital data connection and simulating said remote workstation towards said data network in order to establish a digital end-to-end connection between said mobile data unit and any other party in said data network, wherein
• said mobile data unit and said mobile exchange are connected via a radio communication path.