Sleep Scheduling Using IEQGOR in Wireless Sensor Networks
B. SenthamilSelvi, S.P. Kavya · 2015
QoS routing is an important research issue in wireless sensor networks (WSNs), especially for mission-critical monitoring and surveillance systems which requires timely and reliable data delivery. The existing research suffers from a limitation such as latency, delivery ratio and energy consumption. Based on the analysis and observation, Improved Efficient QoS-aware Geographic opportunistic routing (IEQGOR) has been proposed. IEQGOR integrates awake/asleep schedules, MAC, routing, traffic load balancing and back-to-back packet transmissions. It combines geographic routing, awake- asleep scheduling, and for achieving an energy-efficient data gathering mechanism. It selects the relay node, based on low traffic and link quality. A promising routing scheme in Wireless Sensor Network is shifting toward duty-cycled WSNs in which sensors are sleep scheduled to reduce energy consumption. Nodes alternate between awake/asleep modes according to independent wake-up schedules with fixed duty cycle. The availability of its awake neighbours can be identified by broadcasting an RTS packet for jointly performing channel access and communicating relevant routing information. Available neighbouring nodes respond with clear-to-send (CTS) packet carrying information through which the sender can choose the best relay. Relay selection is performed by preferring neighbours offering good performance in forwarding packets. It achieves remarkable delivery ratio, latency and can greatly limit energy consumption.