Deutschetelekom Ag

Gerd Ortgies

Dirk Von Hugo

Friedrich Ruecker

Friedrich Dintelmann

An improved digital radio communication apparatus and method for communicating in a satellite-supported VSAT network consisting of a plurality of VSAT member stations and at least one central station or hub. Both the apparatus and method concern VSAT systems performing voice, video and data communication in meshed networks comprising at least one central station or hub and VSAT stations via a satellite. The hub sends its information via at least one of its earth stations to the VSAT stations and receives at other frequencies the messages sent by the VSAT stations. Transmission frequencies and allowable overall bit rates are established by the hub as a function of the propagation conditions prevailing on the individual satellite paths. Member traffic is classified as time-critical traffic (ZKV) or non-time-critical traffic (ZUV). A hub comprises two or more earth stations or diversity stations linked by a terrestrial line with traffic always conducted via the earth station or diversity station suffering the least propagation effects and/or system component failures. The central station or hub assigns the individual members, upon request, a secure frequency, at which higher transmission quality is achieved due to lower intermodulation interference, with this assignment possibly referring to a narrow-band transmission channel through which direct telephone traffic can be conducted between two members, avoiding double hop.

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Darmstadt, Germany

Gerd Ortgies