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WiFi multicast to very large groups has gained attention as a solution formultimedia delivery in crowded areas. Yet, most recently proposed schemes donot provide performance guarantees and none have been tested at scale. Toaddress the issue of providing high multicast throughput with performanceguarantees, we present the design and experimental evaluation of the MulticastDynamic Rate Adaptation (MuDRA) algorithm. MuDRA balances fast adaptation tochannel conditions and stability, which is essential for multimediaapplications. MuDRA relies on feedback from some nodes collected via alight-weight protocol and dynamically adjusts the rate adaptation responsetime. Our experimental evaluation of MuDRA on the ORBIT testbed with over 150nodes shows that MuDRA outperforms other schemes and supports high throughputmulticast flows to hundreds of receivers while meeting quality requirements.MuDRA can support multiple high quality video streams, where 90% of the nodesreport excellent or very good video quality.

Experimental Evaluation of Large Scale WiFi Multicast Rate Control