Cost-aware capacity optimization in dynamic multi-hop WSNs
Jukka Suhonen, Mikko Kohvakka, Mauri Kuorilehto, Marko Hännikäinen, Timo D. Hämäläinen · 2007
Low energy consumption and load balancing are re-quired for enhancing lifetime at Wireless Sensor Networks (WSN). In addition, network dynamics and different de-lay, throughput, and reliability requirements demand cost-aware traffic adaptation. This paper presents a novel ca-pacity optimization algorithm targeted at locally synchro-nized, low-duty cycle WSN MACs. The algorithm balances the traffic load between contention and contention free channel access. The energy-inefficient contention access is avoided, whereas the more reliable contention free ac-cess is preferred. The algorithm allows making cost-aware trade-off between delay, energy-efficiency, and throughput guided by routing layer. Analysis results show that the algo-rithm has 10 % to 100 % better energy-efficiency than IEEE 802.15.4 LR-WPAN in a typical sensing application, while providing comparable goodput and delay. 1.