Method and apparatus of preserving power of a remote unit in a dispatch system
First Claim
1. A method for reducing the power consumption of a remote unit in a dispatch system comprising the steps of:
- transmitting from a base station a forward link broadcast signal;
receiving and decoding continually said forward link broadcast signal at a first remote unit and determining whether said forward link broadcast signal comprises active signals;
entering a first dormant state by said remote unit if said remote unit determines that said forward link broadcast signal comprises no active signals for a duration T1 wherein said remote unit receives and decodes sporadically said forward link broadcast signal at said first remote unit; and
reducing a power consumption of said remote unit in said first dormant state.
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Accused Products
Abstract
To reduce the power consumption of a remote unit in a dispatch system the remote unit enters a dormant state. A base station transmits a forward link broadcast signal and monitors a common access channel. A first remote unit continually receives and decodes the forward link broadcast signal and determines whether said forward link broadcast signal comprises active signals. If the remote unit determines that the forward link broadcast signal comprises no active signals for some a duration T1, the first remote unit enters a dormant mode. In the dormant mode the remote unit sporadically receives and decodes said forward link broadcast signal. If this remote unit or any other remote unit on the same net presses a push to talk button, it transmits a message on the common access channel. In response, every remote unit on the net which is in a dormant state exits the dormant state and continually monitors the forward link broadcast signal.
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Citations
20 Claims
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1. A method for reducing the power consumption of a remote unit in a dispatch system comprising the steps of:
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transmitting from a base station a forward link broadcast signal; receiving and decoding continually said forward link broadcast signal at a first remote unit and determining whether said forward link broadcast signal comprises active signals; entering a first dormant state by said remote unit if said remote unit determines that said forward link broadcast signal comprises no active signals for a duration T1 wherein said remote unit receives and decodes sporadically said forward link broadcast signal at said first remote unit; and reducing a power consumption of said remote unit in said first dormant state.
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2. A method of conserving power in a remote unit of a dispatch system comprising the steps of:
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entering a listen state, by a first remote unit, wherein said first remote unit continuously monitors a forward link broadcast channel and transmits requests for increased broadcast power if necessary; entering a first dormant state, by said first remote unit, if an activity level on said forward link broadcast channel falls below a predetermined activity level, wherein in said first dormant state said first remote unit monitors said forward link broadcast channel only during a first predetermined set of time slots spaced apart in time and transmits requests for increased broadcast power if necessary; and reducing an amount of power consumed by said first remote unit in said first dormant state. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for conserving remote unit power in a dispatch system comprising:
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a plurality of remote units, each configured to receive a forward link broadcast channel continuously in a listen state and to monitor link activity on said forward link broadcast channel, wherein each of said plurality of remote units enters a first dormant state if said link activity falls below a predetermined threshold; and a base station configured to generate a broadcast alert on said forward link broadcast channel in response to a push-to-talk indication received from one of said plurality of remote units on an access channel, wherein said broadcast alert commands said plurality of remote units to exit said first dormant state.
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18. An apparatus for controlling a remote unit operating in a dispatch system comprising:
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means for continuously receiving a forward link broadcast channel; means for determining a level of activity on said forward link broadcast channel; and means for receiving said forward link broadcast channel during a first predetermined set of time slots, spaced apart in time, if said level of activity on said forward link broadcast channel falls below a predetermined activity level. - View Dependent Claims (19, 20)
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Specification