Power boost system for cellular telephone
First Claim
1. A-- power boost system-- for a portable radiotelephone comprising:
- a portable radiotelephone having a transceiver, and a microprocessor for implementing telephony system commands;
a booster unit connectable to said radiotelephone and having means for boosting power of a transmitted radio frequency (RF) signal outputted by said radiotelephone, said boosting means being operative to vary an amount of boost in accordance with a control signal provided by said microprocessor;
wherein said booster unit includes a booster memory storing power level data to be read by said microprocessor for selecting said amount of boost, a specific value of power level for calibration of said booster unit being stored in said booster memory; and
said radiotelephone further comprises an antenna for radiating said transmitted RF signal upon disconnection of said booster unit from said radiotelephone, said radiotelephone including a second memory storing power level data, and a transmitter, said microprocessor being operative during a disconnection of said booster unit to command said transmitter to adjust a power level of said transmitted RF signal in accord with data stored in said second memory; and
means responsive to a connection of said booster unit to said radiotelephone for directing said power level data and said a specific value of power level from said booster memory to said microprocessor, upon connection of said booster to said radiotelephone, to obtain a calibrated RF output power from said booster unit.
3 Assignments
0 Petitions
Accused Products
Abstract
A power boost system for a portable radiotelephone (10) employs a booster unit (52) to provide sufficient power for operation of the radiotelephone as a mobile unit in a cellular telephone system, and a junction box (54) which, in combination with a mechanical holder (56) allows for hands-free operation of the radiotelephone in the mobile telephone environment. The junction box is provided with a speaker (62) and a microphone (64) to facilitate the hands-free operation. The desired output power level for radiation from a vehicular antenna (72) is provided by a gain-controlled amplifier (80) in response to a pulse-width modulated command signal (48, 90) provided by a computer (12) within the radiotelephone. A memory (70) within the booster unit stores power level data for the higher levels of power to be used during transmission by the booster unit, the power level data being provided to the computer (12) in generating the power command signal. The memory (70) also stores calibration data of the booster unit attained during manufacture of the booster unit, this data being provided to the computer (12) to compensate for measured values of received signal strength for accurate search of the strongest signal.
55 Citations
12 Claims
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1. A-- power boost system-- for a portable radiotelephone comprising:
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a portable radiotelephone having a transceiver, and a microprocessor for implementing telephony system commands; a booster unit connectable to said radiotelephone and having means for boosting power of a transmitted radio frequency (RF) signal outputted by said radiotelephone, said boosting means being operative to vary an amount of boost in accordance with a control signal provided by said microprocessor; wherein said booster unit includes a booster memory storing power level data to be read by said microprocessor for selecting said amount of boost, a specific value of power level for calibration of said booster unit being stored in said booster memory; and said radiotelephone further comprises an antenna for radiating said transmitted RF signal upon disconnection of said booster unit from said radiotelephone, said radiotelephone including a second memory storing power level data, and a transmitter, said microprocessor being operative during a disconnection of said booster unit to command said transmitter to adjust a power level of said transmitted RF signal in accord with data stored in said second memory; and means responsive to a connection of said booster unit to said radiotelephone for directing said power level data and said a specific value of power level from said booster memory to said microprocessor, upon connection of said booster to said radiotelephone, to obtain a calibrated RF output power from said booster unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power boost system for a portable radiotelephone comprising:
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a portable radiotelephone having a transceiver, and a microprocessor for implementing telephony system commands; a booster unit connectable to said radiotelephone and having means for boosting power of a transmitted radio frequency (RF) signal outputted by said radiotelephone, said boosting means being operative to vary an amount of boost in accordance with a control signal provided by said microprocessor; wherein said booster unit includes a booster memory storing power level data to be read by said microprocessor for selecting said amount of boost; said radiotelephone further comprises an antenna for radiating said transmitted RF signal upon disconnection of said booster unit from said radiotelephone, said radiotelephone including a second memory storing power level data, and a transmitter, said microprocessor being operative during a disconnection of said booster unit to command said transmitter to adjust a power level of said transmitted RF signal in accord with data stored in said second memory; said booster unit further comprises a receiver and an antenna for presenting a received RF signal to said radiotelephone, said radio telephone including means for measuring received signal strength to obtain received signal strength information (RSSI); and said booster memory stores correction factors to be applied to the RSSI, a specific value of power level of received signal strength for calibration of said booster unit being stored in said booster memory, said microprocessor employing said correction factors and said a specific value of power level to compensate for changes in the received signal strength resulting from the presence of said booster unit. - View Dependent Claims (9, 10, 11, 12)
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Specification