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High power control signal transmission and low power data signal transmission in a wireless security system
| Details |
Inventors: Addy, Kenneth L.; Schmit, Thomas P.; Adamo, Patrick;
Assignee: Pittway Corp. (Chicago, IL)
Primary Examiner: Crosland; Donnie L.
Assistant Examiner:
Attorney, Agent or Firm: Greenberg Traurig, LLP, Barkume; Anthony R.
A method, apparatus and system for maximizing transmission power levels in wireless security systems wherein the transmitted power is adjusted depending on the type of signal being transmitted in order to comply with power level restrictions imposed by agency regulations (e.g. Federal Communications Commission). Higher priority control signals messages are transmitted at the maximum permitted or normal output power level and are not compromised by the requirement for transmission of data signals that are transmitted at a reduced power level. In addition, a method and apparatus for reducing a required quantity of data signal transmissions in wireless security systems is provided, wherein data signals are exclusively transmitted at a reduced power level during an installation mode leaving only control signals to be transmitted at normal power during normal operation mode. Data information contained in the data signal is stored in a console during installation mode, and retrieved and displayed to the user in response to the control signal during normal operation mode. The reduction in data signal transmissions reduces on-air time, thereby reducing the potential for message clash. |
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DETAILED DESCRIPTION In accordance with the present invention, a method for maximizing transmission power levels in wireless security systems is provided, which comprises the steps of generating a message, generating a transmission power control signal comprising one of at least two states at any given time dependent upon whether the message comprises data and/or control information, and transmitting a signal comprising the message at a power level indicated by the state of the transmission power control signal.
The signal is transmitted at a reduced power level when the transmission power control signal indicates that the signal comprises data information, and a normal power level when the transmission power control signal indicates that the signal comprises control information.
In further accordance with the present invention, an apparatus for maximizing transmission power levels in wireless security systems is provided, which comprises a processing unit and a transmitter.
The processing unit is adapted to generate a modulating signal and a transmission power control signal.
The modulating signal comprises a message, and the transmission power control signal comprises one of at least two states at any given time dependent upon whether the message comprises data and/or control information.
The transmitter is adapted to transmit a signal comprising the message at a power level indicated by the state of the transmission power control signal.
The transmitter is adapted to transmit the signal at a reduced power level when the transmission power control signal indicates that the signal comprises data information, and a normal power level when the transmission power control signal indicates that the signal comprises control information.
The processing unit is adapted to generate a substantially unique preamble, control information and/or data information, data CRC and/or control CRC.
The preamble is indicative of whether the message comprises control information and/or data information, however, the preamble may be omitted in a particular message in reliance on the prior history of messages in order to determine the current content of the message without a preamble
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