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Wireless LAN administrators are often called upon to deal with the problem of sporadic user congestion at certain popular spaces ("Hot-spots") within the network. To address this problem, authors describe and evaluate two new approaches, explicit channel switching and networkdirected roaming for providing hot-spot congestion relief while maintaining pre-negotiated user bandwidth agreements with the network. The goals of these algorithms are: to accommodate more users by dynamically providing capacity where it is needed, when it is needed; to improve overall network utilization by making more efficient use of deployed resources; and to guarantee at least a minimum amount of bandwidth to users.
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