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Wireless sensor networks (WSNs) are used in numerous ranges of applications to sense the desired data form environment and transmit it to the central coordinator in energy efficient manner in order to increase the network’s lifetime. In addition to energy there are few other factors, such as quality of service (QoS) which are also equally essential to get better performance of the WSNs. Industrial control with automation using wireless sensor networks requires extremely reliable and well-timed data delivery. Various medium access control (MAC) protocols and network layer protocols are designed in order to fulfill application based QoS requirements in WSNs terms of transmission delay and reliability. The mission critical WSN applications are sensitive to transmission delays. To defeat this, a very much characterized QoS is important to upgrade WSN flexibility. We proposed E-MAC (Efficient MAC) protocol for time critical data delivery in WSNs.
Wireless Sensor Network (WSN) is a very important means for closely monitoring and controlling application processes to the end users. The most important reason for establishing the wireless sensor network is to take real-time judgment based on data generated by the sensor nodes (figure 1). This real time transmission of sensor nodes data to the central coordinator is challenging because of the resource constraints and communication capability limitation of sensor nodes. Conventionally, the biggest challenge of sensor network is the restricted lifetime but for real time applications such as military operation, industrial monitoring and control systems, environmental monitoring and health care applications, needs a time bounded and reliable delivery of a data from source node to destination [1-5]. For such applications besides energy, message delivery timeliness is also one of the significant issues. So, based on the type of application it is essential to grant different levels of QoS in WSNs. QoS challenges in WSNs contrast from those in conventional remote systems. The key difficulties identified with WSN are node organization, resource limitations, topology varieties, data redundancy, handling multiple traffic types, real-time traffic and scalability as shown in figure 2, while additional QoS challenges in real time WSN applications are bounded delay, assured throughput, duty cycles and reliable message delivery. In real time applications QoS can be achieved by rising the network throughput and reliability and by reducing the end-to-end delay during data transmission.
Based on Literature review & study in, industrial control and automation applications in wireless sensor networks require extremely reliable and welltimed data delivery. We designed a MAC protocol for handling time critical data transmission. The network topology planned uses two hop communications from sensor nodes to base station. The proposed MAC layer protocol is designed for guaranteed channel access for critical data delivery. Proposed MAC protocol is to be tested over existing protocols for performance analysis based on various parameters such as end to end delay and reliability of data transmission. In further work we will implement the proposed protocol to prove its efficiency.
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