【摘要】 移动蜂窝系统正经历着从2G/3G/4G到5G的交错式代际进化过程,多样化的信号与协议长期共存.如何在庞大、异构、高动态的蜂窝环境中保证服务的高速(传输快)、高能效(耗电少)和高可靠性(不断网)成为至关重要但又非常困难的问题,该问题同时涉及手机制造商、网络服务提供商、操作系统和应用软件开发商.我们研究和综述了近年来针对该问题的代表性工作,发现蜂窝系统表观层面的多个反常性能问题,实际上归因于核心机制层面隐蔽而深刻的“近因现象”:受社会舆论和商业宣传影响,在选择使用移动网络时,存在非理性的代际偏颇和不自觉的速度至上倾向,进而引发了偏向5G的“亏损迁移”、网络容量的“饱和饥饿”以及基站连接的“乒乓跳跃”等连锁效应.为修复上述缺陷,我们提出基于4G/5G双连接以及非齐次时变马尔可夫过程的自调控技术设计,将5G设备的故障发生率降低40%并将所有设备的平均故障持续时间缩短36%,同时探讨我们基于大规模工业合作实践的洞察和创新.更多还原

【Abstract】 The mobile cellular system is undergoing a generation-interlaced evolution from 2G/3G/4G to 5G,with various signals and protocols coexisting for a long period. A crucial but challenging problem that emerges is how to ensure high performance(fast transmission), high energy efficiency(low power consumption), and high reliability(stable connection) for the services in a large, heterogeneous, and highly dynamic cellular environment.This problem simultaneously involves mobile phone manufacturers, network service providers, and OS/application developers. In this paper, we comprehensively review the representative related works in recent years, and learn that a series of performance anomalies in cellular systems is in fact attributed to the “recency effect” at the core mechanisms. Upon selecting which mobile network to use, there exist generation biases and unconscious performance-first tendencies affected by public opinions and commercial promotions. The biases and tendencies lead to knock-on effects like the “loss-making migration” towards 5G, the “saturated hunger” of network capacity,and the “ping-pong jumping” among base station connections. To overcome the above shortcomings, we propose self-regulating techniques based on 4G/5G dual-connectivity and Time-Inhomogenous Markov Process, which reduce the failure rate of 5G devices by 40% and the average failure duration of all devices by 36%. We also discuss other insights and innovations based on large-scale industrial practice.更多还原