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Abstract-The popular IEEE 802.11 WLAN is known to achieve relatively small throughput performance compared to the underlying physical layer (PHY) transmission rate. This is due mainly to the large overheads composed of medium access control (MAC) header, PHY preamble/header, backoff time, acknowledgement (ACK) transmission, and some inter-frame spaces (IFSs). Since these overheads are added to each frame transmission, the throughput degradation is relatively high when the small-size frames are transmitted. In this paper, we present a frame aggregation scheme, which can improve the throughput performance of IEEE 802.11 WLAN. By aggregating small-size frames into a large frame, we can reduce these overheads relatively. We propose a simple method to implement the frame aggregation into the real testbed using off-the-shelf IEEE 802.11 wireless LAN products via the device driver modifications. The performance of the frame aggregation is evaluated by both the numerical analysis and the actual measurements from the real testbed. According to the measurement results from the real testbed, the frame aggregation can improve the throughput performance of IEEE 802.11b WLAN by 2 to 3 Mbps, when multiple frames are aggregated.

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