“…WirelessSensorNetworks(WSNs)consistofnumeroustinysensornodescapableofperforming wirelesscommunicationandoneormorepowerfulsink(s).Theultimatefunctionsofsensornodesare datagatheringandforwardingittothesink.WSNscoverawiderangeofapplicationslikemonitoring geographicalareas,improvingsecurity,protectingnaturalresources,disasterprediction,intelligent transportmanagement,health-care,smarthomeappliancesandsoon (Azizetal.,2013).WSNsare mostlydeployedinunapproachablehostileenvironmentsandlackspecificinfrastructure.Typically, sensorsareheavilyconstrainedbyprocessingspeed,storage,andcommunicationbandwidthand especiallypowersource,asitisbatteryoperated (Wangetal.,2006).Among,energyconstraintisan inevitableprobleminthedesignofwirelesssensornetworksasitimposesaseverelimitationonthe lifetimeofthenetwork.Also,batterysubstitutionisusuallyunachievableduetothemassivenumber ofnodesandinaccessiblenetworkdeployment (Jariwalaetal.,2014).As,nodesneedtooperate longdurationwithlimitedbatteryreserves (Abbasietal.,2007),reducingtheirenergyconsumption through efficient energy conservation techniques will help prolong the network lifetime (Elmazi et al, 2015). Among sensors energy-consuming activities data transmission is prominent and it energyconsumptionrateisdirectlypropositionaltothecommunicationdistancebetweensourceand destination (Liu,2015).Then,proficientroutingofdatapacketsinWSNsisaprominentapproach toreduceanode'senergyconsumption.…”