Radio telephone apparatus having a service area confirmation

Details Radio telephone apparatus having a service area confirmation Radio telephone apparatus having a service area confirmation

1994-04-18

1995-08-22

Kuntz, Curtis

Telephonic communications

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

Including fiber optic link within telephone network

379 58, 379 60, 455 331, 455 332, H04M 1100

Patent

active

054447658

ABSTRACT:
A radio telecommunication apparatus includes a storage for storing a system identification data of a system to which the apparatus belongs to and provides an indication relating to where the apparatus is present on the basis of a result of a comparison between the system identification data stored in the storage and a system identification data received through a control channel which is established immediately before a speech communication link is established. According to the present invention, even if the user's apparatus moves, at the time of calling, from the home area to the roam area or from the roam area to the home area, the area confirmation data corresponding to the current position of the apparatus is accurately displayed.

REFERENCES:
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The Bell System Technical Journal, Advanced Mobile Phone Service, vol. 58, No. 1, Jan. 1979, pp. 124-126.

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