Vermittlungseinrichtung und -verfahren für ein Funktelefoniesystem mit dem Charakter einer Orts- oder Nebenstellenvermittlung

摘要

A radio telephone system is disclosed to satisfy in the short term basic telecommunication needs of areas which are insufficiently or not yet covered. The system has a number of duplex radio channels (transmission channels) substantially smaller than the number of radio telephone subscribers. These transmission channels are connected to the ports of a telecommunications exchange system which is part of the stationary radio station and which ensures both incoming and outgoing traffic with the public telecommunications network and internal exchanges within the system. Signalling, exchange, management, servicing and special functions of radio operation between the stationary radio station and the subscriber connection device are ensured by a radio switching device which uses one or, if required, several transmission channels used as organisation channels and not connected to the ports of the telecommunications exchange system. In the organisation channel, a constant time-multiplexed communication is maintained with the subscriber connection device according to a random access process based on a special organisation channel protocol. An essential characteristic of the invention is that the subscriber connection devices have an a/b interface for the connection of telecommunication terminals. The system and in particular the organisation channel protocol are designed in such a way that no differences from a wired telecommunications connection are perceptible to the user, although the system is radio operated. Included in the basic function is the priority switching of emergency calls and if required other priority call numbers. Besides the basic function, the system allows data and time, as well as paging information, to be transmitted to the subscriber connection devices; this option may involve the use of an additional apparatus or a special system telephone.