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Abstract:In this paper, we propose a method for increasing the handover performance of the 802.11 link layer. The method reduces the number of scanning channels by referencing an AP map based on GPS. Also, by monitoring the SNRs of the mobile node and neighbor APs, it enables the handover to maintain a higher SNR than a given threshold. The experimental results establish that it has an average disconnection rate of 6.7% and an average SNR of 16.8 dB. It is 8.1% lower rate and 42% higher SNR than the method that makes a handover to the nearest AP without considering SNR. Also, it is 4.1% lower rate and 26% higher SNR than the method used by MadWifi.

Abstract. This paper describes the implementation and performance of M-VIA on the AceNIC Gigabit Ethernet card. The AceNIC adapter has several notable hardware features for high-speed communication, such as jumbo frames and interrupt coalescing. The M-VIA performance characteristics were measured and evaluated based on these hardware features. Our results show that latency and bandwidth improvement can be obtained when the M-VIA data segmentation size is properly adjusted to utilize the AceNIC's jumbo frame feature. The M-VIA data segmentation size of 4,096 bytes with MTU size of 4,138 bytes showed the best performance. However, larger MTU sizes did not necessarily result in better performance due to extra segmentation and DMA setup overhead. In addition, the cost of M-VIA interrupt handling can be reduced with AceNIC's hardware interrupt coalescing. When the parameters for the hardware interrupt coalescing were properly adjusted, the latency of interrupt handling was reduced by up to 170 µs.

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