A selective neighbor caching scheme for fast handoff in IEEE 802.11 wireless networks
A selective neighbor caching scheme for fast handoff in IEEE 802.11 wireless networks
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IEEE 802.11 无线网络中快速切换的选择性邻居缓存方案
DOI：
10.1109/icc.2005.1495088
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Yanghee Choi
中科院分区：
文献类型：
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作者：
Sangheon Pack;Hakyung Jung;Taekyoung Kwon;Yanghee Choi
IEEE 802.11网络中的移动性支持是一个具有挑战性的问题。最近，一种新的方案，称为主动邻居缓存（PNC），被提出并通过作为IEEE标准。PNC方案引入邻居图，其动态地捕获无线网络的移动性拓扑以用于预先定位移动的主机（MH）的上下文。然而，PNC方案可能导致显著的信令开销，因为MH的上下文被传播到所有相邻接入点（AP）。我们提出了一个选择性的邻居缓存（SNC）计划，它传播MH的上下文只选定的邻居AP考虑AP之间的切换频率。当需要上下文转移时，选择切换概率等于或高于预定义阈值的相邻AP。在给定目标缓存命中概率的情况下，我们还得到了一个最优的阈值。仿真结果表明，SNC方案显着降低了信令开销，同时保证可比的缓存命中概率相比，PNC方案。
Mobility support in IEEE 802.11 networks is a challenging issue. Recently, a new scheme, called proactive neighbor caching (PNC), was proposed and adopted as an IEEE standard. The PNC scheme introduces a neighbor graph, which dynamically captures the mobility topology of a wireless network for pre-positioning the context of a mobile host (MH). However, the PNC scheme may result in a significant signaling overhead because the MH's context is propagated to all neighbor access points (APs). We propose a selective neighbor caching (SNC) scheme, which propagates an MH's context to only the selected neighbor APs considering handoff frequencies between APs. When the context transfer is needed, neighbor APs with handoff probabilities equal to or higher than a predefined threshold value are selected. We also derive an optimal threshold value when the target cache hit probability is given. Simulation results reveal that the SNC scheme significantly reduces the signaling overhead while guaranteeing a comparable cache hit probability compared to the PNC scheme.