Alcatel N.v.

Alcatel

Artur Veloso

Klaus Geywitz

Joachim Endler

Hans-Joachim Adolphi

Gerd Siegmund

Mobile radio systems with mobile switching centers to which at least one private branch exchange for providing wireline subscriber lines is connected, are known. The branch exchanges require an expensive switching technology and are not capable of providing mobile-radio-specific service features at the wireline subscriber terminals. For the purpose of providing a mobile radio system (MRS) of simple construction accessible also to wireline subscribers, a mobile switching center (MSC) is proposed comprising an interface unit (IF) for interfacing to a concentrator (FSU) which combines a plurality of subscriber lines of wireline subscriber terminals (T1 to Tn). Accordingly, each of the wireline subscriber terminals is connected in such a way that it is treated like a mobile radio terminal, and offered the same available service options. The administration of the subscribers of the wireline subscriber terminals (T1 to Tn) is preferably implemented via a home location register (HLR) and the wireline subscriber terminals include card reading devices for reading authorization cards (SIM).

Mobile radio system with wireline subscriber lines

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.

Interface arrangement for connecting base stations to a private branch

The problem of pulse frame synchronization occurs for example in a telecommunications system with cordless terminals operating according to the DECT standard. To establish a radio connection between base station and a cordless terminal, the base station scans its radio cell in sequence with the available ten high-frequency carriers in the DECT frame rhythm. In a multiple cell environment, the synchronization of all base stations belonging to a cordless telecommunications installation is necessary, to enable all base stations to scan the same frequency at the same time. This is achieved by blanking the DECT multi-frame synchronization pulses. The pulse gap is evaluated by error detection circuits which are present anyway, and used for the PSCN Primary receiver Scan Number-synchronization.

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Goppingen, Germany

Artur Veloso