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Hybrid ARQ is deployed in error prone wireless network to provide reliable unicast transmission with the positive or negative acknowledgement report. However, the feedback implosion is a challenging problem for multicast service, wherein multiple receivers send out feedback in a short period of interval. The traditional representative-based or timer-based feedback suppression method cannot provide adequate accuracy or latency guarantee; and the approach to monitor packet loss rate from each receiver has poor performance in scalability. This paper investigates the relation between feedback overhead and average recovery rate for multicast service in Time Division Multiple Access (TDMA) based wireless network. A scalable aggregate feedback mechanism is proposed to corporate with either fix-rate or rateless channel coding scheme.
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