Uma arquitetura para roteamento dinâmico de vídeos por multicaminhos em redes sem fio

Abstract

Internet of Things video applications in multihop wireless networks benefit from multipath routing strategies to meet Quality of Experience requirements. The experiments conduc- ted so far have assessed video quality only with video streams, disregarding the presence of topology control streams. However, in realistic scenarios, the topology control flows shall be transmitted simultaneously with the video flows in order to keep the topology constantly updated, and allow possible route changes to be automatically established by the multipath selection mechanism in the face of significant changes in the topology over time, such as occasional degradation in quality and/or breakage of links. This work proposes a decentralized wireless network architecture where each node maintains a complete view of the network topology, similar to the implementation of link state protocols. The objective is to enable dynamic routing that adapts to changes in the topology to provide a better Quality of Experience for the user. The simulation results indicate that the proposed architecture can recover video quality in case of link degradation. However, it was observed that the presence of control flows, essential for maintaining the topology, can reduce the final quality of the videos. This research also contributed to the analysis of two approaches to provisioning topo- logy control flow rates. These provisioning strategies showed a improvement trend in the user’s Quality of Experience compared to scenarios that did not employ any provisioning technique. Finally, the analysis of the results highlighted the lack of correlation between the routing metric based on link quality and the User Quality of Experience metric in the transmission of multiple flows over multipath. Keywords: Multipath Routing, Wireless Networks, Topology Monitor, Video Applica- tions, Routing Metrics, Quality of Experience.