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:
- 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, wherein;
the first node is a sink node, and the second node is an arbitrary node among nodes deployed in a tree type from the first node,the first period comprises at least a first number of signal slots, the first number being equal to a maximum number of hops from the second node to the first node,the second node, nodes on a path from the second node to the first node and the first node operate in the respective signal slots in order from the second node,the second period comprises at least a second number of data slots, the second number being equal to a multiplication of the maximum number of hops from the second node to the first node and a maximum number of data packets which are comprised in the detailed event information, andwhen the signal is transmitted or received in the first period, the second node, the nodes on the path ranging from the second node to the first node, and the first node repeat operating in the respective data slots in order from the second node by the number of data packets comprised in the detailed event information to transmit or receive the detailed event information.
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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.
17 Citations
17 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:
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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, wherein; the first node is a sink node, and the second node is an arbitrary node among nodes deployed in a tree type from the first node, the first period comprises at least a first number of signal slots, the first number being equal to a maximum number of hops from the second node to the first node, the second node, nodes on a path from the second node to the first node and the first node operate in the respective signal slots in order from the second node, the second period comprises at least a second number of data slots, the second number being equal to a multiplication of the maximum number of hops from the second node to the first node and a maximum number of data packets which are comprised in the detailed event information, and when the signal is transmitted or received in the first period, the second node, the nodes on the path ranging from the second node to the first node, and the first node repeat operating in the respective data slots in order from the second node by the number of data packets comprised in the detailed event information to transmit or receive the detailed event information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A sensor network communication system including a plurality of sensor nodes which transmit or receive event information wherein:
- the sensor network communication system
divides a cycle time for event information transmission into a first period and a second period longer than the first period, transmits or receives a signal for informing occurrence of an event in the first period, and transmits or receives detailed event information in the second period, when the signal is transmitted or received in the first period, wherein; the sensor nodes comprise a first node which is a sink node, and a second node that is an arbitrary node among nodes deployed in a tree type from the first node, the first period comprises at least a first number of signal slots, the first number being equal to a maximum number of hops from the second node to the first node, the second node, nodes on a path from the second node to the first node and the first node operate in the respective signal slots in order from the second node, the second period comprises at least a second number of data slots, the second number being equal to a multiplication of the maximum number of hops from the second node to the first node and a maximum number of data packets which are comprised in the detailed event information, and when the signal is transmitted or received in the first period, the second node, the nodes on the path ranging from the second node to the first node, and the first node repeat operating in the respective data slots in order from the second node by the number of data packets comprised in the detailed event information to transmit or receive the detailed event information. - View Dependent Claims (13, 14, 15, 16, 17)
- the sensor network communication system
Specification