A Network Density-adaptive Improved CCEF Scheme for Enhanced Network Lifetime, Energy Efficiency, and Filtering in WSNs
Muhammad K. Shahzad and Tae Ho Cho
Wireless sensor networks (WSNs) are composed of a large number of densely deployed sensor nodes with limited and non-rechargeable energy provisions. In sink-based networks, uneven energy-consumption shortens the network lifetime. As number of sensor nodes decreases due to energy depletion with time, results in drastic effects on security and lifetime. Initially transmission range, cluster size, and sensor nodes in a cluster are same. Therefore, in order maintain the number of sensors in a cluster (ñ) this method dynamically adapts (i.e., increases) the transmission range and cluster size. We cater for several limitations of novel commutative cipher based en-route filtering (CCEF) scheme which is based on fixed path routing and does not respond well to the dynamic network conditions (i.e., energy level, keys, and attack information). We use pre-deterministic key distribution instead of probabilistic en-route dissemination to increase filtering capacity. We propose a network density-adaptive method (NDM) based improved CCEF (ICCEF) scheme to overcome these limitations. The results comparison for network lifetime, energy efficiency, and filtering capacity with CCEF and PKCCEF (Pre-deterministic Key-distribution based CCEF) demonstrate the validity of our approach.
Keywords: Wireless sensor networks; network lifetime; security; filtering; energy efficiency.