Nokia Corporation

Nokia Networks Oy

Juha Tiihonen

Tommi Parkkari

Mikko Ohvo

Jorma Peisalo

Jouni Turunen

A method of setting a timer associated with a protocol supportinga data link in a digital mobile communication system in a connection section. At least one party (MSC/IWF, MS) to the connectionsection monitors if the need to change the timer value has arisen. Should such a need be detected, the timer value (S) is set to avalue deviating from the initial value. The need to change the timer value (S) is also determined during the connection, such asin handover, for example by measuring the propagation delay associated with the connection section. This may be implemented by either of the parties to the connection transmitting to the other party a frame (F) which is selected/formed such that the party receiving the frame sends an acknowledgement (Ack) to the transmitting party. The party which transmitted the frame measures the timefrom the moment of transmission of the frame (F) to the arrival of the acknowledgement (Ack) and deduces the propagation delay (D) therefrom.

Method and equipment for setting a timer

A mobile switching center switches telephone calls in a time division multiplex access wireless communications network architecture. A communications controller in the mobile switching center is adapted to control communications between the mobile switching center and at least one base station controller. An interworking function in the mobile switching center is adapted to transfer information between the mobile switching center and another network other than the wireless communications network. A compact data services unit (CDSU) causes said mobile switching center to automatically detect, whenever a downgrade procedure occurs during a data call switched through said mobile switching center, the subchannels of the telephone call dropped in the downgrade procedure network.

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Espoo, Finland

Juha Tiihonen