Data Aggregation Strategies in Wireless Sensor Networks
Sensor nodes are resource constrained and possess limited battery.
So, to avoid the usage of more resources and battery power, data sensed by sensor nodes must be aggregated and disseminated to other nodes.
Data aggregation is the process of collecting data from different sensor nodes and combining it together by applying aggregate functions.
Aggregation strategies are used to enhance the network lifetime.
The various aggregation strategies used in WSN are as follows
Continuous Packet Sensing and Dissemination
Continuous Packet Collection and Dissemination
Programmed Packet Collection and Dissemination
Programmed Packet Aggregation and Dissemination
Programmed Demand Based Aggregation and Dissemination
Weighted Event and Demand Based Data Aggregation.
Continuous Packet Sensing and Dissemination (CPSD)
Since CPSD does not perform actual aggregation, it is also called as zero aggregation scheme.
In this method, each node senses the data at fixed sensing intervals and the node immediately transmitting the received data to cluster head without storing in the buffer.
CPSD is widely used in the situation where the fresh messages are required and the reception of data is required very urgent.
Continuous Packet Collection and Dissemination (CPCD)
In CPCD, each node uses buffer to store the collected and sensed data.
Buffer is a hardware unit and the storage area is allocated by the software used in sensor node.
Each node has to wait until the buffer gets filled by data.
The sensor node keeps on sensing data and tries to fill the buffer.
Once the buffer is filled, the sensor node will start to disseminate data to other nodes.
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