**1. Introduction**

Radio network optimization is one of the main steps to improve the performance of telecommunications cellular networks after deployment and commissioning to solve various problems in order to implement an activity with maximum efficiency and offer a better quality of communication to subscribers [1, 2]. Many operations of radio optimization could be optimized and facilitated with the introduction of drone exploitation as the audit process of cellular networks relays that is used by humans which causes a lot of problems such as taking a lot of time, subject to human error and lacks rapid response in the event of a disaster [3]. Drones also known as unmanned aerial vehicles (UAVs), without human crew on board, and are rather controlled by a person in the field or autonomously via a computer program; the development of drones has led to a change in architecture and operating concepts through the evolution of their features and capabilities [4]. there are so many types of drones that we can easily find in the world and all these drones are working for different applications, the military operations was among the first most common applications of drone technology, because it helps to easily control problems related to surveillance [5], but that does not mean that UAV applications are limited to the military world but also

serve a large part of the economy with advanced mechanisms and impressive capabilities [6], Drones are now working in all fields where humanity operates, for example, used to deliver blood or medical supplies to African countries [7], we can find them also in the agriculture industry [8], personal transportation, Journalism, architectural photography [9], engineering applications [10], Commercial Applications [11] as well as in the world of internet [12]. Currently drones are operating in many fields and, with constant technological advances, these machines will be even more robust and useful [13]. This paper describes a telecommunication's assets inspection process based on the use of autonomous UAVs and human supervised ones capable of overcoming issues related to the human-based classical inspection. Thus, we made a comparative study of both classical and UAV based inspection processes.

The paper is structured as follows: In the second section, we present the concept of quadrotor UAVs. In the third section (section 3), we present the frame design and building of UAVs. In the fourth section we defines the different standard components of quadrotor UAV and its characteristics. In the fifth section, we present the quadrotor assembling methodology. In the sixth section, we present an automated inspection process based on quadrotor UAV. In the seventh section, we present the obtained results validated by the comparative study with the classical inspection process. In the last section, we discuss further perspectives of the process development.
