Opportunistic WiFi offloading in vehicular environment: A queueing analysis
Opportunistic WiFi offloading in vehicular environment: A queueing analysis
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DOI：
10.1109/glocom.2014.7036809
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Nan Cheng;N. Lu;Ning Zhang;Xuemin Shen;J. Mark
中科院分区：
文献类型：
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作者：
Nan Cheng;N. Lu;Ning Zhang;Xuemin Shen;J. Mark
在本文中，我们提出了一种在车辆环境中通过室外 WiFi 网络卸载蜂窝流量的分析框架。具体来说，我们考虑具有泊松数据服务到达的通用车辆用户通过经济高效的 WiFi 网络（想要）或提供全面服务覆盖的蜂窝网络（不得不）从互联网下载/上传数据。在此场景下，以卸载有效性为特征的 WiFi 卸载性能根据所需平均服务延迟进行分析，即为保证 WiFi 可用性而可以延迟数据服务的平均时间。我们通过 M/G/l/K 排队模型在卸载有效性和平均服务延迟之间建立了明确的关系，并检查了两者之间的权衡。我们通过基于 VANET 模拟工具 VANETMobisim 和真实地图数据集的模拟来验证我们的分析框架。我们的分析框架对于为车辆用户和网络运营商提供卸载指南应该很有价值。
In this paper, we present an analytical framework for offloading cellular traffic by outdoor WiFi network in the vehicular environment. Specifically, we consider a generic vehicular user with Poisson data service arrivals to download/upload data from/to the Internet through the cost-effective WiFi network (want-to) or the cellular network providing full service coverage (have-to). Under this scenario, the WiFi offloading performance, characterized by offloading effectiveness, is analyzed in terms of desired average service delay which is the average time the data services can be deferred for WiFi availability. We establish an explicit relation between offloading effectiveness and average service delay by an M/G/l/K queueing model, and the tradeoff between the two is examined. We validate our analytical framework through simulations based on a VANET simulation tool VANETMobisim and real map data sets. Our analytical framework should be valuable for providing offloading guidelines to both vehicular users and network operators.