Abstract: A terminal device and method of re-establishes a circuit switched call or a packet switched connection in a data network having at least a first access network and a second access network. A failure of the circuit switched call or the packet switched connection established via the first access network is detected at the terminal device and connection re-establishment is initiated via the second access network in response to the result of checking registration to the second access network, if a failure has been detected. Thereby, a new option is provided to avoid connection failures when coverage to another access network is available, especially where call re-establishment via the first access network is not allowed.

Abstract: An object of the invention is a call control method for user equipment which can be in connection with more than one radio system. The user equipment is under a first radio system. In the method, a first system detects that there is a need to transfer data to the user equipment. A paging message is transmitted from the first radio system to the user equipment, the message containing a command to move over to the cell of a second radio system. Reselection of the cell is started in the user equipment on the basis of the message.

Abstract: In order to perform data transmission between a mobile station and a cellular radio network, the cellular radio network comprises a radio access network (104, 105, 106) for processing messages according to a first protocol, and a core network (101, 102, 103) for processing messages according to a second protocol. The mobile station deals with messages according to the first protocol on given lower protocol layers and messages according to the second protocol on a given higher protocol layer. On an adaptation layer (301) located between the higher protocol layer and the lower protocol layers, there is performed an adaptation where the messages according to the first and second protocol are mapped into each other.