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Automatic Repeat reQuest (ARQ) is a very effective technique against transmission error at the Medium Access Control (MAC) layer. An erroneous MAC Protocol Data Unit (MPDU) can be typically retransmitted within a given limit. In order to improve the IP-level performance, which directly affects the user-perceived Quality-of-Service (QoS), the authors propose a new truncated ARQ strategy, called MAC Service Data Unit (MSDU)-based ARQ (S-ARQ), where the finite number of opportunities for retransmissions are shared by multiple fragments out of an IP datagram. They describe how S-ARQ can be implemented in a practical system, and then propose another variant of S-ARQ employing a functionality called early detection of failure.
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