無線LANにおけるDCF制御を考慮した可用帯域推定法の提案

概要

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It is necessary to estimate Available Bandwidths of wireless LAN (W-LAN) to guarantee the Quality of Service (QoS). In the Existing Available Bandwidth Estimation methods applicable to wired networks, estimations are made by using probe packets which exceed Available bandwidth and disturb services provided to users. The existing estimation method for WLAN adopts NAV (Network Allocation Vector) interval used in DCF Control for IEEE802.11 WLAN. The existing method could not provide good estimations for high network load conditions. The inaccuracy in the high network load condition is resulted from the increased CW (Contention Window) with the increase in collisions among permission requests of user agents. The increase in the communication overhead of RTS (Request to Send) and CTS (Clear to Send) is additional factor as the transmission rate increases. In this paper, a new estimation method is proposed to reduce the inaccuracy in high network load conditions. Simulations are conducted to demonstrate better accuracy of the proposed method.
2011-04-30