Method and apparatus for transmission of telephone calls to a portable, wireless telephone set
First Claim
1. A method of coupling a stationary unit, said unit being provided with a radio transmitter and a radio receiver and connected to a telephone line, with a coacting portable, wireless telephone unit provided with a radio transmitter and a radio receiver at a relatively short distance from the stationary unit, the method comprising the steps ofindependently searching by means of the radio receiver belonging to a first of the coacting units and a channel selector connected to said receiver for a usable radio speech channel among radio speech channels common to at least the pair of coacting units, said channels having respective numbers, andsending, on a radio signalling channel to the second of the coacting units, a coded call from the first unit and the number of the usable radio speech channel, the signalling channel being an unvarying radio signalling channel common to the pair of units.
1 Assignment
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Accused Products
Abstract
A method and an equipment for wireless transmission of telephone calls between a stationary unit (1) connected to a telephone set (3) at a short distance from the stationary unit provides that all pairs of units (1, 3) have access to a plurality of common duplex radio speech channels for transmission of calls, and to a common radio signalling channel for transmission of signals referring to connection and disconnection of the speech channels. The radio speech channels are assigned after adaptive channel scanning in that they are listened to before a call, and a channel selected which is idle with respect to calls. The selection of an idle channel takes place automatically with the use of radio receivers (12, 25), channel selectors (15, 28) and circuits (16, 29) incorporated in both units.
36 Citations
14 Claims
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1. A method of coupling a stationary unit, said unit being provided with a radio transmitter and a radio receiver and connected to a telephone line, with a coacting portable, wireless telephone unit provided with a radio transmitter and a radio receiver at a relatively short distance from the stationary unit, the method comprising the steps of
independently searching by means of the radio receiver belonging to a first of the coacting units and a channel selector connected to said receiver for a usable radio speech channel among radio speech channels common to at least the pair of coacting units, said channels having respective numbers, and sending, on a radio signalling channel to the second of the coacting units, a coded call from the first unit and the number of the usable radio speech channel, the signalling channel being an unvarying radio signalling channel common to the pair of units.
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6. Equipment for wireless transmission of telephone calls comprising a plurality of pairs of coacting units, each pair comprising
a stationary unit, including a radio transmitter and a radio receiver and connected to a telephone line, and a coacting portable, wireless telephone unit at a short distance from the stationary unit, the portable unit including a radio transmitter, a radio receiver, an earphone, and an acoustic signaller coupled for adapting the portable telephone unit to be used for telephoning over the telephone line, the coacting units each including a set of monitoring circuits, a channel selector for independent searching for a usable radio speech channel among a plurality of radio speech channels common to the units, and further including signalling circuits in both the stationary unit and the portable telephone unit connected to the respective radio transmitter and receiver, adapted for generating and detecting signals referring to connection of the radio speech channels, exchanged between the coacting units on an unvarying radio signalling channel, the signalling channel being common to at least the pair of units in the equipment.
Specification