Why your smartphone doesn't work in very crowded environments
Why your smartphone doesn't work in very crowded environments
复制标题
为什么您的智能手机在非常拥挤的环境中无法工作
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Marsan
中科院分区：
文献类型：
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作者：
P. Castagno;V. Mancuso;M. Sereno;M. Marsan
智能手机用户的一个共同体验是，在拥挤的场景中难以访问服务，比如摇滚音乐会或足球比赛。在这些情况下，为了（部分地）减轻挫折感，用户通常会声称网络拥塞正在发生，并一次又一次地尝试用智能手机访问网络：结果是用户的挫折感和网络拥塞相互加强！研究了蜂窝网络在拥挤环境下性能不佳的根本原因，指出了普遍采用的随机接入方式会阻碍无线资源的充分利用。我们开发了一个简单而准确的分析模型来分析为什么尝试随机访问无线资源会成为一个问题，即使在强制避免访问拥塞的情况下，例如，使用访问类限制技术。我们提出的模型表明，基于集群的网络访问，利用设备到设备的通信，显著缓解了访问问题。此外，它还阐明了控制网络利用率和体验质量的可伸缩性规律，包括小区容量、访问通道数量和集群大小。
An experience common to smartphone users is the difficulty in accessing services in crowded scenarios, such as a rock concert or a football match. In these cases, to (partially) mitigate frustration, users generically claim that network congestion is occurring, and try again and again to access the network with their smartphones: the result is that user frustration and network congestion reinforce each other! This paper investigates the root causes of poor performance of cellular networks in crowded environments and shows that the commonly adopted random access procedure can prevent full utilization of wireless resources. We develop a simple yet accurate analytical model to analyze why attempting random access to wireless resources can become a problem even when access congestion avoidance is enforced, e.g., with the Access Class Barring technique. The model we propose suggests that cluster-based network access, leveraging device-to-device communications, significantly alleviates access problems. Moreover, it sheds light on scalability laws that govern network utilization and quality of experience, in terms of cell capacity, number of access channels, and cluster size.