IEICE Information and Communication Technology Forum
Switching Methods for Semi-Fixed Rate Control in IEEE 802.11n Wireless Mesh Networks
Hiraku Okada, Akito Yoshimoto, Kentaro Kobayashi, Masaaki Katayama, Kenichi Mase,
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In wireless mesh networks using IEEE 802.11 wireless LAN, it is desirable to select and use an optimum transmission rate for each link. Semi-fixed rate control (SFRC) is a technique that determines an optimum transmission rate during the auto-rate period, and then uses it during the fixed-rate period. However, evaluation of the link quality and determination of the best timing to switch from the fixed-rate period to the auto-rate period are the existing challenges. In addition, IEEE 802.11n, whose throughput performance can be enhanced by employing multiple antennas, is very sensitive to the link quality, and the optimum transmission rate is therefore also sensitive. Thus, the time required to switch from the fixed-rate period to the auto-rate period is more important for IEEE 802.11n. In this paper, we investigate the relationship between the received signal strength indicator (RSSI) of each antenna and the optimum transmission rate, and propose methods for switching from the fixed-rate period to the auto-rate period for SFRC. The experimental results indicate the effectiveness of the proposed methods.