异构网络的移动性管理：利用毫米波实现无缝切换
Mobility Management for Heterogeneous Networks: Leveraging Millimeter Wave for Seamless Handover
摘要：
克服毫米波（mmW）通信的不确定性和动态信道变化的最有希望的方法之一是部署集成mmW和微波（$μ$ W）频率两者的双模基站。特别地，如果设计得当，这种双模基站可以增强高度移动无线环境中的移动性和切换。提出了一种新的联合$μ$ W-mmW网络移动性分析和管理方法。所提出的方法利用设备级缓存以及双模基站的功能，以最大限度地减少切换失败，并提供无缝的移动性。首先，基本结果的缓存能力，包括缓存概率和缓存持续时间，推导出建议的双模网络场景。第二，平均可实现的缓存速率为移动用户。然后，缓存的切换次数（HO）和平均切换失败（HOF）的影响进行了分析。推导的分析结果表明，内容缓存将减少HOF和增强移动性管理的异构无线网络与毫米波的能力。数值结果证实了分析推导，并表明，所提出的解决方案提供了显着减少的平均HOF，达到45%，移动用户移动速度相对较高。
英文摘要：
One of the most promising approaches to overcome the uncertainty and dynamic channel variations of millimeter wave (mmW) communications is to deploy dual-mode base stations that integrate both mmW and microwave ($μ$W) frequencies. In particular, if properly designed, such dual-mode base stations can enhance mobility and handover in highly mobile wireless environments. In this paper, a novel approach for analyzing and managing mobility in joint $μ$W-mmW networks is proposed. The proposed approach leverages device-level caching along with the capabilities of dual-mode base stations to minimize handover failures and provide seamless mobility. First, fundamental results on the caching capabilities, including caching probability and cache duration, are derived for the proposed dual-mode network scenario. Second, the average achievable rate of caching is derived for mobile users. Then, the impact of caching on the number of handovers (HOs) and the average handover failure (HOF) is analyzed. The derived analytical results suggest that content caching will reduce the HOF and enhance the mobility management in heterogeneous wireless networks with mmW capabilities. Numerical results corroborate the analytical derivations and show that the proposed solution provides significant reductions in the average HOF, reaching up to 45%, for mobile users moving with relatively high speeds.
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