Alcatel N.v.

Hans-Joachim Adolphi

Artur Veloso

Klaus Geywitz

Joachim Endler

Gerd Siegmund

The essential functions and characteristics of a telecommunications system with cordless terminals are established by the known DECT standard. On the one hand, the invention has the task of reducing the cost of ADPCM/PCM transcoders in DECT or DECT-like systems, and on the other to improve the handover characteristics, by making an interruption-free channel changeover, even during a change of cell bundles. To that effect, all DECT interface circuits (9, 10) are jointly controlled by a central processing unit (MOB CPU) assigned only to these DECT interface circuits (9, 10). The otherwise usual ADPCM/PCM transcoders have been omitted in the DECT interface circuits (9, 10), and are now assigned to the central processing unit (MOB CPU), while their number can be reduced in comparison to known solutions. The central processing unit (MOB CPU) also takes over the switching functions for the channels offered by the DECT interface circuits (9, 10). Since the channels from different DECT interface circuits (9, 10) are in frame-synchronous form, the central processing unit (MOB CPU) can carry out an interruption-free channel change during the cell bundle change of a cordless terminal.

Method and circuit arrangement for the access of cordless terminals to a

To also offer the possibility of mobile communication to branch exchange. The task of the invention is to present an interface arrangement between a private branch exchange and one or more base stations, at low cost for large numbers of existing base stations. To that effect, a microprocessor-controlled interface that maintains the DECT-Standard is offered, which shifts the majority of the functions from the one or more base stations to the branch exchange. A particularly cost-effective solution is obtained by making multiple use of component groups and dynamic channel assignment.

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Stuttgart, Germany

Hans-Joachim Adolphi