METHOD OF ALARM HANDLING IN WIRELESS SENSOR NETWORKS
First Claim
1. A method of wirelessly transmitting alarm signals, comprising the steps of:
- wirelessly transmitting an alarm signal from a transmitting station;
determining whether an acknowledgement signal has been received by the transmitting station, wherein the acknowledgement signal has been wirelessly transmitted from an access point in response to the access point receiving the alarm signal;
waking up a relaying station and keeping the relaying station awake during a plurality of periodic time intervals for overhearing transmissions from the transmitting station;
if it is determined that an acknowledgement signal from the access point has not been received by the transmitting station, then wirelessly re-transmitting the alarm signal from the transmitting station during at least one of the time intervals in which the relaying station is awake;
receiving the alarm signal at the relaying station; and
transmitting the alarm signal from the relaying station to the access point.
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Accused Products
Abstract
A method of wirelessly transmitting alarm signals includes wirelessly transmitting an alarm signal from a transmitting station. It is determined whether an acknowledgement signal wirelessly transmitted from an access point in response to the access point receiving the alarm signal has been received by the transmitting station. A relaying station is woken up and kept awake during a plurality of periodic time intervals for overhearing transmissions from the transmitting station. If it is determined that an acknowledgement signal from the access point has not been received by the transmitting station, then the alarm signal is wirelessly re-transmitting from the transmitting station during at least one of the time intervals in which the relaying station is awake. The alarm signal is received at the relaying station. The alarm signal is transmitted from the relaying station to the access point.
45 Citations
20 Claims
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1. A method of wirelessly transmitting alarm signals, comprising the steps of:
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wirelessly transmitting an alarm signal from a transmitting station; determining whether an acknowledgement signal has been received by the transmitting station, wherein the acknowledgement signal has been wirelessly transmitted from an access point in response to the access point receiving the alarm signal; waking up a relaying station and keeping the relaying station awake during a plurality of periodic time intervals for overhearing transmissions from the transmitting station; if it is determined that an acknowledgement signal from the access point has not been received by the transmitting station, then wirelessly re-transmitting the alarm signal from the transmitting station during at least one of the time intervals in which the relaying station is awake; receiving the alarm signal at the relaying station; and transmitting the alarm signal from the relaying station to the access point. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of wirelessly transmitting alarm signals, comprising the steps of:
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wirelessly transmitting an alarm signal from a transmitting station; determining whether an acknowledgement signal wirelessly transmitted from an access point in response to the access point receiving the alarm signal has been received by the transmitting station; maintaining a relaying station in an awake state during a plurality of periodic time intervals, which are multiples of beacon periods; if it is determined that a first acknowledgement signal from the access point has not been received by the transmitting station, then wirelessly re-transmitting the alarm signal from the transmitting station during at least one of the time intervals in which the relaying station is awake; receiving the alarm signal at the relaying station; transmitting the alarm signal from the relaying station to the access point; determining whether an acknowledgement signal transmitted from the access point in response to the access point receiving the alarm signal has been received by the relaying station; and if it is determined that an acknowledgement signal from the access point has not been received by the relaying station, then re-transmitting the alarm signal from the relaying station. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A wireless network for a security system, the network comprising:
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an access point configured to wirelessly receive an alarm signal and to wirelessly transmit an acknowledgement signal in response to receiving the alarm signal; a relaying station including a security sensor, the relaying station being configured to; periodically listen for said alarm signal; and relay said alarm signal overheard during the periodic listening, the alarm signal being relayed to the access point; and a transmitting station configured to; sense a security breach and wirelessly transmit at least one said alarm signal in response to sensing the security breach; re-transmit the alarm signal during the periodic listening by the relaying station if an acknowledgement signal is not received from the access point; and enter a sleep mode after receiving an acknowledgement signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification