Enhancing the MAC throughput by two schemes of frames aggregation with eA-MSDU in WLANs

EEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communication in the 900 MHz and 2.4, 3.6, 5, and 60 GHz frequency bands. They are created and maintained by the Institute of Electrical and Electronics Engineers (IEEE) LAN/MAN Standards Committee. IEEE 802.11n defines two schemes of frames aggregation: aggregate Mac Service Data Unit (A-MSDU) and aggregate Mac Protocol Data Unit (A-MPDU). They aimed at maximize utilizing WLAN PHY efficiency at MAC level, through sharing headers and timings overheads. Despite their efficiencies in enhancing the MAC throughput, the schemes are characterized with yet other overheads due to the aggregation. So to maximize the throughput gain, and also to utilize the efficiency of both of the scheme by merging them to co-work together in a scheme known as two-level aggregation, therefore, this research is carried out with the aim of minimizing the overhead due to the aggregation. An enhanced A-MSDU with minimal headers overhead, and an efficient two-level aggregation scheme utilizing the enhanced AMSDU are proposed. The eA-MSDU improved channel’s utilization by up to 10% and 20% in terms of throughput increase. Results from the simulation show superiority of the proposed two-level aggregation in respect of throughput and overall channel utilization.

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