Arrangement for operating a mobile terminal in a wireless switch

Details Arrangement for operating a mobile terminal in a wireless switch Arrangement for operating a mobile terminal in a wireless switch

1997-05-02

2000-01-25

Chin, Wellington

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455552, 455557, H04Q 720

Patent

active

060186720

ABSTRACT:
To be able to utilize the advantages of a cordless system based on the DECT standard as well as the advantages of a cellular mobile radio system based on the GSM standard, dual-mode units are known which switch automatically to the lower cost standard. The expense of such units and of the necessary additional circuits in the network infrastructure is avoided when the mobile unit and a mobile unit adapter are equipped with an infrared interface, whereby all the necessary information for the man-machine communication are transmitted independently of the standards. In this way it is possible to access the GSM mobile radio network without engaging the network infrastructure, for example with a DECT mobile unit via a GSM mobile unit adapter. The infrared interface circuit, which essentially comprises an infrared transceiver (1.1, 2.1), a codec (1.3, 2.3) and a digital signal processor (1.2, 2.2), transmits the speech or potentially data as well, the content of the display read-out and the information via respectively activated keys.

REFERENCES:
patent: 4876710 (1989-10-01), Reed et al.
patent: 5241410 (1993-08-01), Streck et al.
patent: 5442680 (1995-08-01), Shellinger et al.
patent: 5535274 (1996-07-01), Braitberg
patent: 5636264 (1997-06-01), Sulavuori et al.
patent: 5659598 (1997-08-01), Byrne et al.
patent: 5737703 (1998-04-01), Byrne
patent: 5774805 (1998-06-01), Zicker

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