Baris Yamansavascilar

Failures in networks result in service disruptions which may cause deteriorated Quality of Service (QoS) for the end-users. Since SDN is becoming the mainstream paradigm for networks, the implementation of a robust fault tolerance scheme for SDN-based networks is crucial. Moreover, that robust fault tolerance scheme should ensure the stability for QoS and Quality of Experience (QoE). To this end, we investigated

• A novel dynamic protection method considering the quality of alternative paths.

• How video quality and thus QoE would fluctuate when a failure occurs.

• The effect of the detection of the congestion in the link layer operating Bidirectional Forwarding Detection (BFD) rather than the application layer.

• The impact of BFD intervals on the QoE parameters along with the video segment size to come up with a feasible operational range where the fault tolerance approach is beneficial for the congestion case.

Note that this study was my thesis subject in my MS studies.