Public cordless telephone
First Claim
1. A cordless telephone arrangement for operation in a public telephone system, the arrangement including a plurality of base units and a plurality of remote units, each base unit being activatable by each remote unit for requesting service therefrom, the arrangement comprising:
- means for adapting each one of the plurality of base units for operation on separate selected ones of a plurality of radio frequency channels;
means located in each remote unit for interrogating each of the plurality of channels for detecting an available channel and for transmitting an unique randomly generated identification code for establishing communications with a base unit operating on the available channel, the identification code being transmitted over the available channel by a remote unit to the base unit for identifying said remote unit as requesting service; and
activation means in the base unit responsive to the receipt of the identification code for establishing communications between the base unit and the remote unit requesting service.
1 Assignment
0 Petitions
Accused Products
Abstract
A cordless telephone employed in a public telephone system provides mobility and service at reasonable cost to users of portable communications equipment. The system includes a plurality of base units which are accessible by a plurality of similarly configured cordless telephones. Each one of these base units is assigned and operates on one of multiple frequency channels and each one of the cordless telephones is capable of establishing a communications link with each one of these base units. Once a cordless telephone establishes communications with a base unit within its reception range, other cordless telephones within this reception range are precluded from establishing communications with this base unit or monitoring or otherwise interfering with communications between the cordless telephone and this base unit while the communications link is established therebetween.
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Citations
18 Claims
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1. A cordless telephone arrangement for operation in a public telephone system, the arrangement including a plurality of base units and a plurality of remote units, each base unit being activatable by each remote unit for requesting service therefrom, the arrangement comprising:
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means for adapting each one of the plurality of base units for operation on separate selected ones of a plurality of radio frequency channels; means located in each remote unit for interrogating each of the plurality of channels for detecting an available channel and for transmitting an unique randomly generated identification code for establishing communications with a base unit operating on the available channel, the identification code being transmitted over the available channel by a remote unit to the base unit for identifying said remote unit as requesting service; and activation means in the base unit responsive to the receipt of the identification code for establishing communications between the base unit and the remote unit requesting service. - View Dependent Claims (2, 3, 4, 5)
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6. A method of communicating in a public telephone system having a plurality of base units and a plurality of remote units, each base unit being activatable by each remote unit for requesting service therefrom, the method comprising the steps of:
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adapting each one of the plurality of base units for operation on separate selected ones of a plurality of radio frequency channels; interrogating each of the plurality of channels by each remote unit for detecting an available channel; transmitting from each remote unit an unique randomly generated identification code over the available channel for establishing communications with a base unit operating on the available channel, the identification code identifying a particular remote unit requesting service; and establishing communicatins between the base unit and the remote unit requesting service in response to the receipt of the identification code by the base unit from the remote unit. - View Dependent Claims (7, 8, 9, 10)
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11. A cordless telephone remote unit for operation in a public telephone system, the system including a plurality of base units and a plurality of remote units, each base unit being adaptable for operation on a separate selectd one of a plurality of radio frequency channels and responsive to receipt of an identification code from a remote unit requesting service, the remote unit comprising:
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means for interrogating each of the plurality of channels for detecting an available channel and for transmitting an unique randomly generated identification code for establishing communications with a base unit operating on the available channel; and means for seizing the available channel as a dedicated channel for dedicated communications between the remote unit and the base unit. - View Dependent Claims (12, 13, 14)
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15. A method of communicating with a cordless telephone remote unit in a public telephone system, the system including a plurality of base units and a plurality of remote units, each base unit being adaptable for operation on a separate selected one of a plurality of ratio frequency channels and responsive to receipt of an identification code from a remote unit requesting service, the method comprising the steps of:
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interrogating each of the plurality of channels for detecting an available channel; transmitting an unique randomly generated identification code for establishing communications with a base unit operating on the available channel; and seizing the available channel as a dedicated channel for dedicated communications between the remote unit and the base unit. - View Dependent Claims (16, 17, 18)
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Specification