Modified POX Controller for Enhancing Quality of Experience of Multimedia Streaming in a Realistic Software Defined Vehicular Ad Hoc Networks

In today's digital era, multimedia streaming is one of the major sources of internet traffic and it is also expected to grow significantly in upcoming years. Even though traditional Vehicular Ad Hoc Networks (VANET) provide solutions for multimedia content delivery through best effort, the Quality of Experience (QoE) of these techniques is crucially damaged by dynamic network changes, fluctuations in bandwidth and congestion in the network due to lack of global view. However, all these limitations can be substantially reduced by the introduction of Software Defined Network (SDN) architecture. Hence this hybrid network called Software Defined Vehicular Network (SDVN) introduces a global view, flexibility, scalability and smartness in multimedia streaming. The proposed work uses a POX controller with an OpenFlow Spanning Tree topology discovery unit-based SDN framework for the real-world vehicular network. This modified POX was compared with the traditional vehicular network and a normal POX for QoE parameters like Multi Scale Structural Similarity, Three Component Structural Similarity, Blurring, Delta, Mean sum of absolute difference and Noise estimation. For testing, a Standard Definition (SD) video was streamed between vehicular nodes under dense and real-world traffic scenarios. The QoE Metrics of Modified POX improved between 1 % to 42%. Hence the proposed Modified POX presents an enhanced end-to-end QoE for multimedia streaming service.