Abstract
In a WSN, huge amount of data is generated by sensor nodes continuously. Data generated by nodes make a large distributed database. Information requirements for various applications can only be satisfied if the data available in the network is extracted to a suitable location and processed efficiently. However, query based systems are popular in database type environment. Wireless Sensor Networks find usage in a wide range of applications. It is possible due to various mechanisms such as adhoc routing protocols, in network data aggregation and signal processing etc. Performance of the network can be improved by tweaking these features. In order to evaluate performance of a network objectively a number of metrics have been defined. Some important ones are: lifetime, coverage, cost and ease of deployment, response time, temporal accuracy, security and effective sample rate. In this paper various metrics for WSN evaluation have been discussed. Many of these metrics are interrelated. Generally, performance in one metric may have to be decreased to achieve increase in some other metric.
Highlights
Information requirements for various applications can only be satisfied if the data available in the network is extracted to a suitable location and processed efficiently
Wireless Sensor Network (WSN) is a network composed of small devices called ‘nodes’ which are haphazardly distributed over some area of scrutiny
Various new proposals have come up regarding Two-Tier Multiple Query Optimization (TTMQO) leading to decreased number of radio transmissions and lowering the transmission time in the sensor network
Summary
Wireless Sensor Network (WSN) is a network composed of small devices called ‘nodes’ which are haphazardly distributed over some area of scrutiny. These nodes are ‘sensors’ which behave like a computer as they are capable of storing information gathered from the area under supervision, evaluate the data gathered and forward the same. Environmental conditions cannot be changed as these are to be monitored by the WSN, so node failure due to battery depletion is to be minimized. The sensors deployed in the network for various applications accumulate the data and pass it on to the sink where it gets stored for further analysis. Writing queries in an optimal way at the Base Station (BS) is another approach to
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