Virtual Node Schedule for Supporting QoS in Wireless Sensor Network

Providing a Quality of Services (QoS) in Wireless Sensors Network (WSN) is one of the challenging issues due to resource constraints in terms of memory, bandwidth, processing power, and power sources that are inherent properties of WSN nodes. To overcome these limitations and improve QoS provisioning in clustered and TDMA scheduled WSN, we introduce the Virtual Nodes concept to improve the goodput, and decrease the overall latency of delivering data sent from critical nodes to the sink node. Simulation results show that the providing critical nodes with additional virtual time slots improved the latency, goodput. This improvement increases as the number of critical nodes increases. This comes with slight extra power consumption experienced by critical nodes to achieve better latency and goodput.