SENSOR NETWORK SYSTEM AND COMMUNICATION METHOD THEREOF
First Claim
1. A method for transmitting and receiving event information between a first node and a second node in a sensor network including a plurality of sensor nodes, the method comprising the steps of:
- dividing a cycle time for event information transmission into a first period and a second period longer than the first period;
transmitting or receiving a signal for informing occurrence of an event in the first period; and
transmitting or receiving detailed event information in the second period, when the signal is transmitted or received in the first period.
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Accused Products
Abstract
Provided are a communication method and system for sensor network. In reporting event occurrence in a real-time sensor network application, a cycle time is divided into an event announcement period and a data transmission period to provide real-time transmission performance and energy efficiency. Each of the periods is again divided into the number of slots equal to the maximum depth of a network. Respective nodes sequentially operate according to their depths in a routing tree during the event announcement period to receive the signal transmitted from the lower node. To remove sleep delay, a slot next to the signal reception slot becomes a signal transmission slot. A node sensed an event transmits a signal informing event occurrence during its signal transmission slot, and this signal includes only the address of the transmission node. When a signal does not exist in the event announcement period, no traffic occurs in the data transmission period and the upper nodes maintain a sleep state. When a signal is transmitted during the event announcement period, nodes transmitting/receiving a corresponding signal operate during the data transmission period to transfer data packets.
80 Citations
20 Claims
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1. A method for transmitting and receiving event information between a first node and a second node in a sensor network including a plurality of sensor nodes, the method comprising the steps of:
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dividing a cycle time for event information transmission into a first period and a second period longer than the first period; transmitting or receiving a signal for informing occurrence of an event in the first period; and transmitting or receiving detailed event information in the second period, when the signal is transmitted or received in the first period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A sensor network communication system including a plurality of sensor nodes which transmit or receive event information, the sensor network communication system
dividing a cycle time for event information transmission into a first period and a second period longer than the first period, transmitting or receiving a signal for informing occurrence of an event in the first period, and transmitting or receiving detailed event information in the second period, when the signal is transmitted or received in the first period.
Specification