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An Enhanced A-MSDU Frame Aggregation Scheme for 802.11n Wireless Networks

Published: 01 October 2012 Publication History

Abstract

The main goal of the IEEE 802.11n standard is to achieve a minimum throughput of 100 Mbps at the MAC service access point. This high throughput has been achieved via many enhancements in both the physical and MAC layers. A key enhancement at the MAC layer is frame aggregation in which the timing and headers overheads of the legacy MAC are reduced by aggregating multiple frames into a single large frame before being transmitted. Two aggregation schemes have been defined by the 802.11n standard, aggregate MAC service data unit (A-MSDU) and aggregate MAC protocol data unit (A-MPDU). As a consequence of the aggregation, new aggregation headers are introduced and become parts of the transmitted frame. Even though these headers are small compared to the legacy headers they still have a negative impact on the network performance, especially when aggregating frames of small payload. Moreover, the A-MSDU is highly influenced by the channel condition due mainly to lack of subframes sequence control and retransmission. In this paper, we have proposed an aggregation scheme (mA-MSDU) that reduces the aggregation headers and implements a retransmission control over the individual subframes at the MSDU level. The analysis and simulations results show the significance of the proposed scheme, specifically for applications that have a small frame size such as VoIP.

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  1. An Enhanced A-MSDU Frame Aggregation Scheme for 802.11n Wireless Networks

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    Published In

    cover image Wireless Personal Communications: An International Journal
    Wireless Personal Communications: An International Journal  Volume 66, Issue 4
    October 2012
    245 pages

    Publisher

    Kluwer Academic Publishers

    United States

    Publication History

    Published: 01 October 2012

    Author Tags

    1. 802.11n
    2. A-MSDU
    3. Aggregation headers
    4. Frame aggregation
    5. Next generation networks
    6. WLAN

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