Mobility

Aggregation With Fragment Retransmission for Very High-Speed WLANs

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Executive Summary

In upcoming very high-speed Wireless LANs (WLANs), the physical (PHY) layer rate may reach 600 Mbps. To achieve high efficiency at the medium access control (MAC) layer, it identified fundamental properties that must be satisfied by any CSMA-/CA-based MAC layers and develops a novel scheme called Aggregation with Fragment Retransmission (AFR) that exhibits these properties. In the AFR scheme, multiple packets are aggregated into and transmitted in a single large frame. If errors happen during the transmission, only the corrupted fragments of the large frame are retransmitted. An analytic model is developed to evaluate the throughput and delay performance of AFR over noisy channels and to compare AFR with similar schemes in the literature.

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