Cordless telephone system for moving conveyances

Details Cordless telephone system for moving conveyances Cordless telephone system for moving conveyances

1992-07-08

1994-01-25

Ng, Jin F.

Telephonic communications

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

Including fiber optic link within telephone network

379 60, 379 61, H04M 1100

Patent

active

052822397

ABSTRACT:
A cordless telephone system serves a building with a moving conveyance such as an elevator. The system has at least one portable cordless telephone, at least one fixed base station that communicates with the portable cordless telephone by a wireless circuit outside the moving conveyance, and a moving-conveyance base station that communicates with the portable cordless telephone by a wireless circuit inside the moving conveyance. A central switch routes calls to the fixed base station or moving-conveyance base station according to the field strength of signals received at these stations from the portable cordless telephone.

REFERENCES:
patent: 4456793 (1984-06-01), Baker et al.
patent: 4748655 (1988-05-01), Thrower et al.
patent: 4789049 (1988-12-01), Watanabe et al.
patent: 4906989 (1990-03-01), Kasugai
Patent Abstracts of Japan vol. 13, No. 552, 8 Dec. 1989 (JP-A-12 26 684).
Patent Abstracts of Japan vol. 13, No. 465, 20 Oct. 1989 (JP-A-11 81 687).
Burke, T., Proceedings of the National Communications Forum, vol. 43, No. 2, Oct. 1989.
European Search Report EP 92 30 6071 dated 28 Jul. 1993.

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