Facsimile transmission in a mobile communication system
First Claim
1. A method for facsimile transmission in a digital mobile communication network, the method comprising steps ofinitiating facsimile call set-up,establishing a transparent rate-adapted data connection between a facsimile adapter of a mobile station, connected to the first telefax terminal, and a facsimile adapter in an interworking unit,selecting preliminary data rate and channel coding for a data connection,establishing an end-to-end facsimile connection between the first and the second telefax terminal transparently through the facsimile adapters and the data connection,negotiating the facsimile data rate for a facsimile connection by signalling between the telefax terminals,changing a data rate and the channel coding of the data connection depending on the negotiated facsimile data rate,characterized by further steps ofallocating parallel traffic channels for said data connection, when the maximum data rate allowed for the telefax terminals on said data connection is higher than the maximum data rate of an individual traffic channel,selecting the number of said allocated traffic channels so that a maximum data rate of the data connection is higher than the maximum data rate allowed for the telefax terminals,selecting the most effective channel coding available, enabled by the extra transmission capacity of the data connection, for each facsimile data rate negotiated by the telefax terminals.
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Accused Products
Abstract
A digital mobile communication system comprises a mobile station(MS) with a facsimile adapter(2), a first telefax terminal(1) connected to the adapter, a mobile network(BSS, MSC), an interworking unit(32) with a second facsimile adapter(33). A high-speed transparent rate-adapted facsimile connection is set up between the telefax terminals. The number of parallel traffic channels(ch0-chn) allocated to the high-speed data connection is such that the maximum data rate of the data connection is higher than the allowed maximum 10 data rate of the telefax terminals(1,10). The telefax terminals may negotiate the facsimile data rate. The second facsimile adapter(33) monitors the negotiation and selects, on the basis of the negotiated facsimile data rate, the most effective channel coding available for the data connection.
38 Citations
7 Claims
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1. A method for facsimile transmission in a digital mobile communication network, the method comprising steps of
initiating facsimile call set-up, establishing a transparent rate-adapted data connection between a facsimile adapter of a mobile station, connected to the first telefax terminal, and a facsimile adapter in an interworking unit, selecting preliminary data rate and channel coding for a data connection, establishing an end-to-end facsimile connection between the first and the second telefax terminal transparently through the facsimile adapters and the data connection, negotiating the facsimile data rate for a facsimile connection by signalling between the telefax terminals, changing a data rate and the channel coding of the data connection depending on the negotiated facsimile data rate, characterized by further steps of allocating parallel traffic channels for said data connection, when the maximum data rate allowed for the telefax terminals on said data connection is higher than the maximum data rate of an individual traffic channel, selecting the number of said allocated traffic channels so that a maximum data rate of the data connection is higher than the maximum data rate allowed for the telefax terminals, selecting the most effective channel coding available, enabled by the extra transmission capacity of the data connection, for each facsimile data rate negotiated by the telefax terminals.
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4. A mobile system comprising a mobile station (MS), a facsimile adapter (2) in the mobile station, a first telefax terminal (1) connected to the adapter, a mobile network (BSS, MSC), an interworking unit (32) in the mobile network, a facsimile adapter (33) in the interworking unit, the mobile network being able to set up a facsimile connection between the first telefax terminal (1) and a second telefax terminal (10) via the facsimile adapter (2) of the mobile station and the facsimile adapter (33) of the inter working unit in such a way that between the facsimile adapters there is a transparent rate-adapted data connection (V.110nd the mobile network is able to change the channel coding used in said data connection according to a facsimile data rate negotiated by the telefax terminals, characterized in that
the mobile network (MSC) is arranged to allocate for said data connection (V.110) a number of parallel traffic channels (ch0-chn) when the maximum data rate allowed for the telefax terminals on said data connection is higher than a data rate of an individual traffic channel, said number of the traffic channels being such that the maximum data rate of the data connection is higher than said maximum data rate allowed for the telefax terminals, the mobile network is arranged to select the most effective channel coding available, enabled by the extra transmission capacity of the data connection, for each facsimile data rate negotiated by the telefax terminals.
Specification