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Top1. Introduction
Recent advancement in Unmanned Aerial Vehicle (UAV) technologies and its availability for civilian applications motivates various researchers to employ it for remote sensing data collection tasks from Wireless Sensor Sensors (WSNs) (Zeng & Zhang,2016; Hayat,2016; Gupta&Jain,2015) and known as UAVs-assisted WSNs. In UAVs-assisted WSNs, a set of UAVs are dispatched from the Base Station (BS) for sensing data acquisition form the sensor nodes (SNs) that are deployed over harsh ground topography such mountains, farms, dense forest, disaster areas, etc. Use of UAVs with WSNs provides various advantages (Messous & Sedjelmaci,2017;Dong,2014) such as reduction of communication traffic burden on network infrastructure, improvement in communication coverage with all ground SNs, independent of its ground geographical position due to easy and flexible mobility of the UAVs, speed-up in the data gathering and dissemination process, saving of the valuable energy recourses of the SNs, easily extraction of information from remote and harsh area and enhancement of network lifetime etc. (Dong,2014; Zhan & Zeng,2017). Thus, UAV-assisted WSN will be very helpful in various applications such as monitoring and tracking tasks at border areas and agriculture fields, rescue and disaster monitoring, ocean monitoring and tracking, and different smart cities applications etc. (Messous & Sedjelmaci,2017; Dong,2014; Zhan & Zeng,2017).