Method and system for providing a digital wireless local loop

Details Method and system for providing a digital wireless local loop Method and system for providing a digital wireless local loop

1994-12-06

1997-02-18

Chan, Wing F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

455 20, 455 331, H04Q 730

Patent

active

056047894

ABSTRACT:
A method and system for providing a digital wireless local loop for use by a wireless transceiver, e.g., a portable handset, in an indoor environment utilizing an outdoor base transceiver. Upon determining that the portable handset is located in an outdoor environment, the base transceiver and the portable handset communicate over one of a first plurality of frequencies. The outdoor portable handset is prohibited from transmitting and receiving signals over frequencies other than the first plurality of frequencies. Upon determining that the portable handset is located in an indoor environment, the base transceiver first transmits the communication signal to a first converter at one of a second plurality of frequencies different from the first plurality of frequencies. The first converter then converts the frequency to a predetermined conversion frequency different from the first and second plurality of frequencies. The signal is then transmitted to a second converter located in the indoor environment over the predetermined conversion frequency. The second converter shifts the frequency of the signal back to the one of the second plurality of frequencies and transmits the signal to the portable handset.

REFERENCES:
patent: 4989230 (1991-01-01), Gillig et al.
patent: 5235632 (1993-08-01), Raith
patent: 5349631 (1994-09-01), Lee
patent: 5402523 (1995-03-01), Berg
patent: 5404570 (1995-04-01), Charas et al.
patent: 5437054 (1995-07-01), Rappaport et al.
patent: 5438608 (1995-08-01), Kojima
patent: 5475735 (1995-12-01), Williams et al.
"The GSM System for Mobile Communications", Michel Mouly and Marie-Bernadette Pautet, pp. 64-71, 444-447, 464-467. 1992.

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