Portable radio telephone having power saver
First Claim
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1. A battery-powered radio communication unit for use in a mobile telecommunication network covering a service area which is divided into a plurality of cells each having a cell site, comprising:
- means for receiving signals from the cell sites and generating signals indicating respective strengths of the received signals;
processing means for detecting the strongest signal from said received signals in accordance with said strength indicating signals, comparing the detected strongest signal with a threshold corresponding to a signal strength at the boundary of said service area and generating a first output indicating that said portable radio communication unit is outside of said service area when said strongest signal is lower than said threshold or a second output indicating that said portable radio communication unit is inside of said service area when said strongest signal is higher than said threshold; and
battery saving means responsive to said first output for periodically interrupting the power supplies to power consuming portions of said communication unit.
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Abstract
A battery-powered portable radio telephone for use in a mobile telephone network receives signals from the network and judges from the received signal whether the radio telephone is inside or outside of the service area of the network. A battery saver is provided to periodically interrupt the battery power of the telephone when the latter is judged as being outside of the service area.
104 Citations
10 Claims
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1. A battery-powered radio communication unit for use in a mobile telecommunication network covering a service area which is divided into a plurality of cells each having a cell site, comprising:
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means for receiving signals from the cell sites and generating signals indicating respective strengths of the received signals; processing means for detecting the strongest signal from said received signals in accordance with said strength indicating signals, comparing the detected strongest signal with a threshold corresponding to a signal strength at the boundary of said service area and generating a first output indicating that said portable radio communication unit is outside of said service area when said strongest signal is lower than said threshold or a second output indicating that said portable radio communication unit is inside of said service area when said strongest signal is higher than said threshold; and battery saving means responsive to said first output for periodically interrupting the power supplies to power consuming portions of said communication unit. - View Dependent Claims (2, 3, 4, 5)
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6. A method for saving the battery power of a portable communication unit for use in a mobile telecommunication network covering a service area, said service area being divided into cells having cell sites, comprising the steps of:
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(a) receiving signals from said cell sites, generating signals indicating respective strengths of the received signals and selecting the strongest signal from said received signals in accordance with said strength indicating signals; (b) determining whether said selected strongest signal is higher or lower than a threshold corresponding to a signal strength at the boundary of said service area; (c) if said strongest signal is determined as being lower than said threshold, interrupting power supplies to power consuming portions of said communication unit during a prescribed duration and then repeating the steps (a) and (b); and (d) if said strongest signal is determined as being higher than said threshold, repeating the steps (a) and (b). - View Dependent Claims (7, 8, 9, 10)
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Specification