Method and apparatus for monitoring link activity to prevent system deadlock in a dispatch system
First Claim
1. A method of preventing deadlock in a push-to-talk dispatch system comprising a broadcast net of users in which one user at a time is granted system talker privileges, comprising the steps of:
- monitoring a reverse link traffic signal from a remote unit that currently holds a system talker privilege; and
denying said system talker privilege from said remote unit if a lack of link activity is detected in said reverse link traffic channel.
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Accused Products
Abstract
Method and apparatus to prevent system deadlock in a dispatch system by monitoring link activity. The dispatch system is comprised of a set of remote units which communicate with each other by broadcasting one at a time to the group. A remote unit communicates with the other remote units through at least one base station. A communications manager grants a remote unit exclusive system talker status upon request through the base station servicing the requesting remote unit. The base station monitors a series of data from the remote unit designated as the system talker to detect voice activity. The base station sends a surrogate request to the communications manager to relinquish the system talker privilege if the voice activity falls below a predetermined threshold.
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Citations
11 Claims
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1. A method of preventing deadlock in a push-to-talk dispatch system comprising a broadcast net of users in which one user at a time is granted system talker privileges, comprising the steps of:
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monitoring a reverse link traffic signal from a remote unit that currently holds a system talker privilege; and denying said system talker privilege from said remote unit if a lack of link activity is detected in said reverse link traffic channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for preventing deadlock in a push-to-talk dispatch system comprising a broadcast net of users in which one user at a time is granted system talker privileges, comprising:
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a first remote unit, said first remote unit for transmitting variable rate data to at least one other remote unit and for requesting a system talker privilege; a base station for receiving said variable rate data, for broadcasting said variable rate data to at least one other remote unit, for monitoring said variable rate data to detect link activity, and for generating a surrogate PTT-- off indication when said link activity is less than a predetermined level; and a communications manager for granting and denying said system talker privilege, for receiving said surrogate PTT-- off indication, and for transmitting a release indication signal to said base station.
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10. An apparatus for preventing deadlock in a push-to-talk dispatch system comprising a broadcast net of users in which one user at a time is granted system talker privileges,, comprising:
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means for monitoring a reverse link traffic signal from a first remote unit holding a system talker privilege; and means for sending a surrogate PTT-- off indication to a communications manager if a lack of link activity is detected in said reverse link traffic signal.
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11. A method of preventing deadlock in a push-to-talk dispatch system comprising a broadcast net of users in which one user at a time is granted system talker privileges, comprising the steps of:
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monitoring a reverse link traffic signal from a remote unit that currently holds a system talker privilege; sending a surrogate request to a communications manager to deny system talker privilege to the remote unit if a lack of link activity is detected in the reverse link traffic channel; sending a denial of system talker privilege from said communications manager to a base station in response to said surrogate request; and sending said denial of system talker privilege from the base station to the remote unit.
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Specification