Cordless telephone base unit arranged for operating with multiple portable units
First Claim
1. In a cordless telephone system employing a plurality of handset units and a base unit, an arrangement for establishing communications between the base unit and one of the plurality of handset units, the arrangement comprising:
- means in both the base unit and each of the plurality of handset units for storing a common predetermined security code used in establishing each communication link between said base unit and one of the plurality of handset units over a communication channel;
means in each one of the plurality of handset units responsive to the establishing of a communication link with said base unit for generating a substitute security code uniquely different from said predetermined security code, said substitute security code being substituted for said predetermined security code for use in subsequent communications with said base unit over said communication channel; and
means for providing said substitute security code from one of the plurality of handset units to said base unit over an established communication link for use in said subsequent communications with said base unit during said established communication link, said base unit being unresponsive to communication attempts from other of the plurality of handset units unaccompanied by said substitute security code while communicating with a handset unit that provided said substitute security code.
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0 Petitions
Accused Products
Abstract
A cordless telephone system includes an arrangement wherein multiple portable units operate with a common base unit using the same security code without conflict or confusion. When a portable unit attempts to establish a radio link with the base unit, for example, this originating portable unit generates a random number which is retained by this unit and also transmitted to the base unit. This random number is substituted for the common stored security code, then shared by the base unit and all of the portable units, for creating a temporary unique security code that is known only to the base unit and the originating portable unit. Interference from other portable units attempting to gain access to the base unit while the originating portable unit is actively communicating with the base unit is thereby advantageously prevented.
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Citations
30 Claims
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1. In a cordless telephone system employing a plurality of handset units and a base unit, an arrangement for establishing communications between the base unit and one of the plurality of handset units, the arrangement comprising:
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means in both the base unit and each of the plurality of handset units for storing a common predetermined security code used in establishing each communication link between said base unit and one of the plurality of handset units over a communication channel; means in each one of the plurality of handset units responsive to the establishing of a communication link with said base unit for generating a substitute security code uniquely different from said predetermined security code, said substitute security code being substituted for said predetermined security code for use in subsequent communications with said base unit over said communication channel; and means for providing said substitute security code from one of the plurality of handset units to said base unit over an established communication link for use in said subsequent communications with said base unit during said established communication link, said base unit being unresponsive to communication attempts from other of the plurality of handset units unaccompanied by said substitute security code while communicating with a handset unit that provided said substitute security code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of establishing communications between a base unit and one of a plurality of handset units, the method comprising the steps of:
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storing a common predetermined security code in both the base unit and each of the plurality of handset units used in establishing each communication link between said base unit and one of the plurality of handset units over a communication channel; generating a substitute security code uniquely different form said predetermined security code, in at least one of the plurality of handset units responsive to the establishing of a communication link with said base unit, said substitute security code being substituted for said predetermined security code and used in subsequent communications with said base unit over said communication channel; and providing said substitute security code from said at least one of the plurality of handset units to said base unit over an established communication link for use in said subsequent communications with said base unit during said established communication link, said base unit being unresponsive to communication attempts from other of the plurality of handset units unaccompanied by said substitute security code while communicating with said at least one handset unit that provided said substitute security code. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. In a cordless telephone system employing a plurality of handset units for establishing communications with a base unit in the telephone system, a handset unit comprising:
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means in the handset unit for storing a predetermined security code used in establishing each communication link between said base unit and the handset unit over a communication channel said predetermined security code also being stored in said base unit; means in the handset unit responsive to the establishing of a communication link with said base unit for generating a substitute security code uniquely different from said predetermined security code, said substitute security code being substituted for said predetermined security code for use in subsequent communications with said base unit over said communication channel; and means for providing said substitute security code from the handset unit to said base unit over an established communication link for use in said subsequent communications with said base unit during said established communication link, said base unit being unresponsive to communication attempts from other of the plurality of handset units unaccompanied by said substitute security code while communicating with said handset unit that provided said substitute security code. - View Dependent Claims (18, 19, 29)
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20. In a cordless telephone system employing a plurality of handset units and a base unit for establishing communications with the plurality of handset units, the base unit comprising:
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means for storing a predetermined security code used in establishing each communication link between said base unit and one of the plurality of handset units over a communication channel said predetermined security code also being stored in each one of the plurality of handset units; means responsive to the establishing of a communication link with one of the plurality of handset units for receiving a substitute security code uniquely different from said predetermined security code, said substitute security code being substituted for said predetermined security code received from said one of the plurality of handset units over said communication channel; and means for adopting said substitute security code received from said one of the plurality of handset units for use in subsequent communications with said one of the plurality of handset units during said established communication link, said base unit being unresponsive to communication attempts from other of the plurality of handset units unaccompanied by said substitute security code while communicating with said one of the plurality of handset units that provided said substituted security code. - View Dependent Claims (21, 22, 23, 24, 25, 30)
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26. A method of establishing communications between a base unit and one of a plurality of handset units, the method comprising the steps of:
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storing a predetermined security code in a handset unit used establishing each communication link between said base unit and the handset unit over a communication channel said predetermined security code also being stored in the base unit; generating in the handset unit a substitute security code uniquely different from said predetermined security code responsive to the establishing of a communication link with said base unit over the communication channel; and providing said substitute security code from the handset unit to said base unit, said substitute security code being substituted for said predetermined security code for use in subsequent communications with said base unit during said established communication link, said base unit being unresponsive to communication attempts from other of the plurality of handset units unaccompanied by said substitute security code while communicating with said handset unit that provided said substitute security code. - View Dependent Claims (27, 28)
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Specification