Wireless Sensor Networks (WSN) having a large number of battery operated low-cost, low-power, and compact sensor nodes with limited memory and processing, are a self-monitoring intelligent network system. Due to the technical developments in the areas of sensing, computation, and wireless transmission, WSN has emerged as a frontier in providing cost-effective, fully distributed, and rapid solution. Quality of Service (QoS) in terms of network connectivity and sensing coverage are the two most significant performance metrics for WSN. Entire network sensing is measured by coverage. Whereas, connectivity measures transfer of data between sensor nodes and/or to a central unit. The objective of this research is to focus on coverage optimization with fault-tolerance connectivity in a network. Overall, the improved model proposed in this work is extremely useful for establishing Quality of Service to WSN. The focus of this work is on QoS techniques for wireless sensor networks based on criteria such as energy efficiency, coverage optimization with fault tolerance connectivity. The solutions provided are particularly valuable in prolonging the network’s lifetime while not affecting the quality in monitoring applications