Musubi: Improving Loss Resilience by Exploiting Multi-Radio Diversity for SDN-Based WLAN

As Wi-Fi networks are becoming insecurely denser, frame loss and the consequent throughput degradation are much more profound, due to severe interference in dense networks. Pre- vious works propose to exploit multi-radio diversity to improve loss resilience. However, they are far from practical because of their incompatibility with the Wi-Fi standard, high deployment cost and large processing delay. In this work, we propose Musubi, which is a practical and low cost solution for exploiting multi- radio diversity. Furthermore, Musubi does not require client-side modification, thus it is totally compatible with the legacy Wi-Fi standard. Musubi leverages flexibility and programmability of the growingly-popular Software- Defined-Network (SDN) based WLAN, and incorporates capture effect and redundancy packet elimination, so as to handle the specific challenges raised in loss resilience. Compared with a state- of-the-art solution, in theory analysis, Musubi achieve 15% jitter decrease with only 0.8% throughput decrease, when frame loss rate is 20%. We implemented deployed and evaluated Musubi. Experiment results show that Musubi reduces frame loss by 70% and achieves throughput gain up to 1.4amp;#x000D7; as well as packet delay decreasing by 34% compared with the legacy Wi-Fi.