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In upcoming years most of population will reside in town area, this rapid town evolution is now retaining compression on present framework (Sharma et al., 2020). To overwhelm this novel ultimatum, town societies nearby biosphere emphasis on IoT based WSN applications in smart cities to decrease outlays, advance communication, broadcasting and increase services (Singh & Rishiwal, 2019). There are numerous IoT based applications for smart cities including smart framework, smart transference, smart fitness care and smart power grid (Kizito & Semwanga, 2020). IoT revolution creates it smoother for town constructions to advance sustainability by redeemable power ingesting (Kumar & Rishiwal, 2019). Smart power supervision methods custom IoT strategies to attach separate lighting, cooling, fire safety and lighting methods to dominant organize software (Galli, 2020). The power organization solicitation acmes fields of large custom and power drifts. Smart construction power organization system can be noteworthy to protect power ingesting. As smarter town structures custom power organization systems, the town will develop more maintainable as entire (Kumar & Rishiwal, 2019). IoT can improve how town societies consume water. Smart rhythms can advance escape exposure and info truthfulness, evade misplaced income due to extravagance. Auspiciously, IoT is best positioned to create improvements to this field (Bekalli & Balboul, 2019). Info to be gathered from smartphones, traffic cameras, street sensors to shade transportation happenings in immediate (Singh & Rishiwal, 2019). Motorists can be distressed of coincidences and focused to streets that are fewer congested (Srinidhi et al., 2019). The possible consequences and assistances of IoT based applications in smart cities are massive, and outcome will be significant. IoT is a system of corporeal substances including devices, buildings, vehicles and other substances (Singh et al., 2019). These substances entrenched by electronics, sensors, software and system connectivity that allows statistics gathering and interchange amid them (Kumar & Aabanadam, 2019). Data gathering and transmission are accomplished over internet deprived of any assistance of hominids. Beside these outlines, IoT deviates the biosphere from actual extinct substances to intellectual effective substances (Lin et al., 2020). Also, it contributes humanoid the honor of governing each thing about. IoT covers four chief modules sensors, interface, system connectivity and data dispensation (Haseeb et al, 2020). System connectivity is important module of IoT. WSN signifies the main method to accomplish system connectivity in IoT based applications (Panda, 2019). WSN entails of gateways and sensor nodes (SNs). SNs interconnect and provide data to gateway SN. Formerly, gateway gathers data from SNs and conveys to operator by internet (Anjum et al., 2018). The key challenge in WSN is redeemable power ingesting of SNs because of small lifetime of SNs, for that, QoS based Optimization Energy Clustering Routing (QOECR) is proposed to resolve the power ingesting delinquent in WSN (Chinthaluru et al., 2019; Mudasser et al., 2019).