## 2 Literature Review  
SDN with network function virtualization, one can gain a global view of the entire network can be analysed using an open interface such as OpenFlow and with the centralized network controller. SDN can support new services and programs at any level of user requirement or need [4]. The current practice of focusing predominantly on rate-distortion performance with little consideration for these restrictions has led to the development of encoders that often perform poorly in non-ideal network conditions [1]. GPP has started discussions about technologies that could be standardized in future standards of 5G such as full dimension of multi-input multi-output, usage of unlicensed band, and multi-radio access technology coordination [5]. The availability of high-speed networks and the decreased cost of video capturing and displaying technology have opened the door for better monitoring systems in solar farms. Commonly used methods for the thermal imaging in the solar farms are by crane or lift, by walking and through drones. Considering the first two methods, the thermal imaging inspection is dependent on the module angle and the field topology. In addition, to obtain better results the thermal camera lens angle must be perpendicular to the panel surface. While both of these methods requires more time and resources, the third method, drone operation is much more effective and does not depend on the ground conditions, module angle, or field topology. Moreover, a centralized data set can be obtained from the drone inspection method and it is expected that video communication will be the dominating traffic over wireless and IP networks [6]. The data is aggregated and processed by servers to provide meaningful information or an actionable output. This output could be sent back through the network to trigger a set of actuator devices [7]. The related research fields such as embedded systems, computer networks, advanced hardware ranging from cameras, sensor nodes, boards and the like have been manufactured in industries has a bandwidth wider than 4G and higher scale of antenna array, higher the data rate and the computational burden due to digital signal processing far heavier [8]. The data flow from the streaming server could be controlled. The mobile network buffer queue serves the data in a rate that is modelled as a Poisson process. The client queue serves the data in its encoded bit rate [9]. UOWCs are vulnerable to numerous factors such as scattering, absorption and fading. In addition, UOWC performance is limited to short range and extensive research is required for long-range communications [10]. The variety of possible WLAN configurations and WIFI standards creates a need to determine their capabilities and to estimate the video stream transmission quality. The growing popularity of Wi-Fi networks creates a natural need to provide the same services in wireless environment [11]. A number of cross-layer techniques have been proposed to address the routing problem for real-time video transmission over multi-hop wireless networks in order to maximize the received video quality [12]. The MDC-FEC enables each video segment in a scalable mode of video coding standard to be packetized into multiple descriptions for the highest data protection against lossy transmission, and more fine-grained video streaming under varying bandwidth constraints and diverse playback capacities of mobile devices [13]. Engineering requirements for 5G and the design issues, M-MIMO, cloud-based networking, SDN, energy efficiency,spectrum regulation and standardization for 5 Gwas proposed [14]. These devices are now playing an ever increasingly important role in lives. Recently, industry has made significant progress in resolving a lot of constraints due to the widespread adoption of wireless technologies [15]. It can be observed that the behaviour of radio signals is very different in the underground mines compared to that in outdoor and line of sight environments.