Analysis of Slotted and Unslotted CSMA/CA Wireless Sensor Network for E-healthcare System

Wireless Sensor Network (WSN) have emerged as an important area for research and development because of their application such as in e-healthcare monitoring system. This paper presents and discusses the performance of slotted and unslotted Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol WSN for medical system, with a few additions to the protocol and adequate tuning parameters. Performance of slotted and unslotted protocol CSMA/CA were evaluated and analyzed for different network configurations to understand the impact of protocol parameters such as Superframe Order (SO), Beacon Order (BO), Backoff Exponent (BE), and Maximum Backoff Exponent (maxBE). Network performances Quality of Service (QoS) are analyzed, namely Throughput, Power Consumption, Average Delay, and Packet Success Probability. The proposed work is implemented in Network Simulator 2 (NS2). The performance of the protocol CSMA/CA was evaluated for WSN star topology. The simulation results show that of unslotted CSMA/CA is better than slotted CSMA/CA in terms of the packet success probability, energy consumption, and delay. While slotted CSMA/CA is better than unslotted CSMA/CA in term of throughput.