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US 5,524,275 AGranted
Averaged RF exposure control
AssigneeEricsson GE Mobile Communications Inc.
InventorBo K. Lindell
Life of this patent
Estimating the term…
Abstract
A radio transmitter output power controller which automatically restricts the maximum transmitting time during an averaging time so that the average power remains below an acceptable level. Additionally or alternatively, the maximum transmitter output power may be automatically reduced to a lower level if and when a predetermined average power level is approached. A warning signal may be generated to inform a user that the maximum permitted power output is being approached.
Claims11
An apparatus comprising:
- means for determining a total energy that a radio transmitter has transmitted during a preceding time period;
- first means for comparing said total energy to a first predetermined threshold;
- means for disabling said radio transmitter when said comparing means determines that said first threshold has been exceeded;
- second means for comparing said total energy at which said radio transmitter has transmitted during said preceding time period, including a time period in which said transmitter has been disabled, to a second predetermined threshold;
- and
- means for enabling the resumption of radio transmission after being disabled when said total energy has diminished to a level not greater than said second threshold.
3 more elements
An apparatus comprising:
- means for determining a total energy a radio transmitter has transmitted during a preceding time period;
- means for comparing said total energy to a warning threshold;
- means for generating an alarm when said comparing means determines that said warning threshold has been exceeded;
- and
- means for setting said warning threshold, wherein said warning threshold setting means includes:
- means for predicting when said total energy is likely to exceed a permitted maximum total energy output level;
- and
- means for determining said warning threshold sufficiently below said permitted maximum total energy output level to allow said alarm to be generated approximately a predetermined time prior to said transmitter exceeding said permitted maximum total energy output level, based on a result of said predicting means.
5 more elements
An apparatus comprising:
- means for determining a total energy a radio transmitter has transmitted during a preceding time period;
- means for comparing said total energy to a first total energy reduction threshold:
- means for reducing a maximum power level at which said transmitter can transmit when said comparing means determines that said first total energy reduction threshold has been exceeded;
- and
- means for setting said first total energy reduction threshold, wherein said first total energy reduction threshold setting means includes:
- means for predicting when said total energy is likely to exceed a permitted maximum total energy output level;
- and
- means for determining said first total energy reduction threshold sufficiently below said permitted maximum total energy output level to allow for power reduction at approximately a predetermined time prior to said transmitter exceeding said permitted maximum total energy output level, based on a result of said prediction means.
5 more elements
An apparatus comprising:
- means for determining a total energy a radio transmitter has transmitted during a preceding time period;
- means for comparing said total energy to a first total energy reduction threshold;
- means for reducing a maximum power level at which said transmitter can transmit when said comparing means determines that said first total energy, reduction threshold has been exceeded;
- means for comparing said total energy at which a radio transmitter has transmitted during said preceding time period, including a time period in which said transmitter power output has been reduced, to a second predetermined reduced total energy threshold;
- and
- means for removing said reduced maximum total energy output restriction when said total energy has diminished to be not greater than said second reduced total energy threshold, said second reduced total energy threshold being lower than said first total energy reduction threshold.
3 more elements
Dependencies are inferred from the claim text.