一种适用于IEEE 802.11无线局域网的自适应多媒体切换方案
An Adaptive Multimedia-Oriented Handoff Scheme for IEEE 802.11 WLANs
摘要：
先前的研究已经表明，在IEEE 802.11无线局域网（WLAN）中采用的实际切换方案不满足许多多媒体应用（如IP语音）的严格延迟约束。标准切换过程中支持的主动和被动扫描模式都具有重要的延迟，这影响了802.11网络上实时通信所需的服务质量（QoS）。此外，由于802.11基础设施WLAN中占用的接入点（AP）的有限覆盖区域造成频繁的拥塞，该问题进一步复杂化。我们提出了一个新的优化和快速切换方案，减少切换延迟和发生，通过执行一个无缝的预防扫描过程和有效的下一个AP的选择。通过仿真和性能评估，我们证明了新的自适应切换，减少了过程延迟，并增加了新的上下文为基础的参数的有效性。结果表明，QoS延迟方面所需的应用程序和优化的AP选择，消除切换事件是无益的。
英文摘要：
Previous studies have shown that the actual handoff schemes employed in the IEEE 802.11 Wireless LANs (WLANs) do not meet the strict delay constraints placed by many multimedia applications like Voice over IP. Both the active and the passive supported scan modes in the standard handoff procedure have important delay that affects the Quality of Service (QoS) required by the real-time communications over 802.11 networks. In addition, the problem is further compounded by the fact that limited coverage areas of Access Points (APs) occupied in 802.11 infrastructure WLANs create frequent handoffs. We propose a new optimized and fast handoff scheme that decrease both handoff latency and occurrence by performing a seamless prevent scan process and an effective next-AP selection. Through simulations and performance evaluation, we show the effectiveness of the new adaptive handoff that reduces the process latency and adds new context-based parameters. The Results illustrate a QoS delay-respect required by applications and an optimized AP-choice that eliminates handoff events that are not beneficial.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
