Energy efficient communication schemes in multi-relay WSNs with power allocation

The analysis of energy efficiency of non-cooperative (single hop, and multi hop), cooperative, and hybrid transmission in multi relay based wireless sensor networks (WSNs), is done in this paper. This analysis is progressed under the influenced of target-outage probability (OP) and end-to-end throughput constraint. We have used Rayleigh fading distribution in our system model. Furthermore rather than equal transmission power allocation solution [ETPAS], half transmission power allocation solution [HTPAS] has been used to enhance the energy saving performance in cooperative, non-cooperative, and hybrid transmission schemes. This solution proposes that, if the relay node lies between the source and destination, the required transmission power allocated to relay for forwarding the packet, is half of the transmission power allocated to source. In most of the scenarios, analytical results show that cooperative incremental schemes are more energy efficient than others. Finally, for the long and short distance communication, incremental hybrid transmission (IHT) and single hop (SH) are the best schemes, respectively.