Improved access point selection
Improved access point selection
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DOI：
10.1145/1134680.1134705
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
Anthony J. Nicholson;Y. Chawathe;Mike Y. Chen;Brian D. Noble;D. Wetherall
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文献类型：
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作者：
Anthony J. Nicholson;Y. Chawathe;Mike Y. Chen;Brian D. Noble;D. Wetherall
本文介绍了Virgil，一个自动接入点发现和选择系统。与完全基于接收信号强度选择接入点的现有系统不同，Virgil扫描某个位置的所有可用AP，快速关联到每个AP，并运行一系列测试来估计每个AP与互联网的连接质量。Virgil还探测被阻塞或重定向的端口，以指导AP选择，从而有利于保留当前正在使用的应用服务。我们在三个城市的五个社区进行的评估结果显示，Virgil发现可用连接的频率比仅根据信号强度进行选择的频率高22%至100%。通过缓存AP测试结果，Virgil提高了性能和成功率。我们的开销是可以接受的，并且比使用Windows XP手动选择AP更快。
This paper presents Virgil, an automatic access point discovery and selection system. Unlike existing systems that select access points based entirely on received signal strength, Virgil scans for all available APs at a location, quickly associates to each, and runs a battery of tests to estimate the quality of each AP's connection to the Internet. Virgil also probes for blocked or redirected ports, to guide AP selection in favor of preserving application services that are currently in use. Results of our evaluation across five neighborhoods in three cities show Virgil finds a usable connection from 22% to 100% more often than selecting based on signal strength alone. By caching AP test results, Virgil both improves performance and success rate. Our overhead is acceptable and is shown to be faster than manually selecting an AP with Windows XP.