Synchronization among distributed wireless devices beyond communications range
First Claim
1. A method for time synchronization among a plurality of distributed communication devices, comprising the steps of:
- a) coupling each of said devices with a sensor;
b) configuring the sensor output to control the activity of the communication device;
c) configuring each of the sensors to output a signal upon sensing a same event, wherein this event is not a modulated communication transmission;
d) configuring said devices for operation in time synchronization with each other, wherein at least one of said communication devices achieves synchronization without communicating with other communication devices;
e) defining a transmission cycle divided to time slots;
f) assigning a unique identification number to each of said devices;
g) associating each identification number with at least one unique time slot;
h) at each device synchronizing said time slots with said sensor output signal;
i) configuring each device to periodically transmit during its unique time slot(s).
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Abstract
The present invention discloses a method and system for time synchronization among distributed communication devices, particularly wireless and even beyond communications range, either fixed or mobile, configured to communicate data with each other, typically over peer to peer local area networks, specifically mesh or ad-hoc networks, where said communication devices are usually dormant in order to save battery power, then said devices are configured to simultaneously wake up and accordingly allocate synchronized time slots for communications among thereof. A particular embodiment of the present invention concerns with Automatic Meter Reading (AMR).
80 Citations
15 Claims
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1. A method for time synchronization among a plurality of distributed communication devices, comprising the steps of:
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a) coupling each of said devices with a sensor; b) configuring the sensor output to control the activity of the communication device; c) configuring each of the sensors to output a signal upon sensing a same event, wherein this event is not a modulated communication transmission; d) configuring said devices for operation in time synchronization with each other, wherein at least one of said communication devices achieves synchronization without communicating with other communication devices; e) defining a transmission cycle divided to time slots; f) assigning a unique identification number to each of said devices; g) associating each identification number with at least one unique time slot; h) at each device synchronizing said time slots with said sensor output signal; i) configuring each device to periodically transmit during its unique time slot(s). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for time synchronization among a plurality of distributed communication devices, comprising the steps of:
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a) coupling each of said devices with a sensor; b) configuring the sensor output to control the activity of the communication device; c) configuring each of the sensors to output a signal upon sensing a same event, wherein this event is not a modulated communication transmission; d) configuring said devices for operation in time synchronization with each other, wherein at least one of said communication devices achieves synchronization without communicating with other communication devices; e) configuring each of said communication devices to determine the relative delay in which it detects said event and adjust synchronization accordingly.
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15. A system for Automatic Meter Reading (AMR) comprised at least of:
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a) a communication device coupled to a meter, said device comprised of;
i) a radio transceiver;
ii) a meter reader;
iii) a microcontroller;
iv) memory component(s) storing a unique identification number (ID);
v) a sensor;
said radio coupled to said microcontroller and said microcontroller coupled to said meter reader and to said memory component(s) and to said sensor;b) a central station comprised of;
i) a central computer;
ii) a radio transceiver;wherein said communication device configured to periodically read its meter and store a data record containing at least said reading and said meter'"'"'s ID, and communicate stored data records to other communication devices, and store received data records, said central station configured to communicate with some communication devices and acquire data records, wherein at least part of the communications among said communication devices are synchronized with signals derived from said sensors, said sensors configured to output a signal upon sensing a same event which is not detected by said transceivers, wherein at least one of said communication devices achieves synchronization without communicating with other communication devices.
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Specification