The second class of works on improving the IP multicast transmission over WLANs is based on converting a multicast transmission flow into multiple unicast transmission flows, one for each multicast subscriber. ![]() One of the main disadvantages of this approach is associated with the lengthy process of amending the IEEE 802.11 standard specifications and supporting the new standard functions in real products. This approach also enables an appropriate adaptation of contention window after each successful or unsuccessful transmission, which solves the unfairness problem. By doing that, IP Multicasting over WLAN becomes more reliable, and the rate adaptation can be applied to that. ![]() The first class of works directly addresses the Multicast mechanisms of 802.11 MAC protocol and proposes to include explicit feedback (ACK) in the protocol for multicast traffic, e.g., see. literature on this topic can be classified into two classes of approaches.
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