Cell extender with timing alignment for use in time division mul

Details Cell extender with timing alignment for use in time division mul Cell extender with timing alignment for use in time division mul

1994-03-08

1996-07-30

Coles, Sr,, Edward L.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 59, 455 111, 455 331, 455 332, 370 953, 370 951, 370 97, 370108, H04B 7212, H04J 300, H04J 306, H04L 700

Patent

active

055419798

ABSTRACT:
A cell extender for use in digital cellular telephone systems comprises a control module, and scanning module, and several traffic modules. The control module bidirectionally repeats the donor cell site control channels. Voice modules therein bidirectionally repeat selected donor traffic channels for mobiles. The voice module amplifies and translates the Reverse Digital Traffic Channel RDTC (transmitted by the mobile). The voice module reframes the Forward Digital Traffic Channel, and advances its timing such that RDTC signals transmitted by the mobile and repeated by the cell extender arrive at the donor with the correct timing alignment. The timing advance compensates for RF path propagation delay between the donor and the cell extender, and for any additional delay through the cell extender. If the voice module determines that the mobile is leaving the cell extender coverage area, it sends a hand-off message returning the mobile to the assigned donor traffic channel.

REFERENCES:
patent: 4937812 (1990-06-01), Itoh et al.
patent: 5229996 (1993-07-01), Backstrom et al.
patent: 5268933 (1993-12-01), Averbuch
patent: 5293380 (1994-03-01), Kondo
patent: 5363373 (1994-11-01), Nakahara et al.
patent: 5406561 (1995-04-01), Arai

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