Improved quality of service in wireless sensor Network with mobile sink

Wireless Sensor Network (WSN) is an emerging field in the broader area of wireless networking; with application ranges from surveillance to health care. One of the major quality of service (QoS) degradation factor is last hop bottle neck in WSN, which results in low throughput and valuable energy depletion of the nodes; resulting in degradation of overall network lifetime and latency. This paper provides in depth simulation and analysis of sink mobility strategies to overcome the last hop bottle neck issue. We have investigated different sink mobility strategies with different speeds depending upon network load and traffic to bring optimized results. The paper is aimed in finding a substantial solution to the problem using cross layer protocols. Simulations are carried out in OPNET Modeler v 14.5 to investigate ZigBee (IEEE 802.15.4) various important quality of service parameters in WSN.