Data gathering in a timely and reliable fashion has been a key concern in Wireless Sensor Networks (WSNs) particularly related to military and surveillance applications. The introduction of real time communication has created additional challenges in this area with different communication constraints. Since sensor networks represent a new generation of time-critical applications, it is often necessary for communication to meet real time constraints. However, research dealing with providing QoS guarantees for real time traffic in sensor networks is still immature. Further, recently it has been shown that traffic arrival process in WSN does not follow the traditional Poisson model. Instead, it is found that an ON/OFF model is found to be most suitable to capture the bursty source traffic in WSN. To overcome the limitations in the area of performance evaluation of wireless sensor network, this paper proposes a novel analytical framework. The proposed analytical framework is based on a traffic model which is similar to an ON/OFF process, exhibits self-similar and long-range dependant characteristics. To provide performance guarantees to different applications in WSNs, the traffic model contemplates multiple classes of traffic. We analyze the model on the basis of G/M/1 queuing system with a novel scheduling mechanism and find exact packet delay for corresponding traffic classes.
['Mohsin Iftikhar', 'M. Anwar Hossain']
An analytical G/M/1 queueing model for providing guaranteed QoS in multimedia surveillance