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. Previous 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 1.4x as well as packet delay decreasing by 34% compared with the legacy Wi-Fi.