异构无线网络垂直切换技术综述

doi:10.11959/j.issn.1000-436x.2015303

摘要/Abstract

摘要：

垂直切换是多网融合的基础，是实现异构网络互通、支持不同接入方式无缝衔接的核心技术，目前正在受到业界的重点关注，并成为学术界研究的热点问题。随着无线移动通信技术向接入多元化、网络一体化和应用综合化的方向发展，各种蜂窝移动接入、宽带无线接入和固定接入将共同接入基于IP的统一核心网络，通过网络间的垂直切换，支持用户的移动性和移动过程中业务的连续性。首先给出了垂直切换的定义和基本概念，介绍了垂直切换的分类和基本流程，随后详细论述垂直切换的切换判决和切换执行2个环节。针对切换判决，总结了现有判决算法，重点评述各代表算法工作原理并剖析论其特点和存在的不足。针对切换执行，详述了现有垂直切换执行机制的工作原理和适用场景，并分析其优缺点。最后，对未来垂直切换技术的研究方向进行了展望。

关键词: 异构无线网, 垂直切换, 水平切换, 切换判决, 切换执行

Abstract:

Vertical handoff between different access technologies is the basic requirement for convergence of different access technologies.It is also the key technology to implement interconnection of heterogeneous networks and support seamless integration of different access networks.As a result,providing efficient solutions for vertical handoff has received tremendous attention from the academia and industry all over the world.With the trend of diversity of access technologies,unification of networks and synthesis of applications,cellular mobile communication,broadband wireless access and fixed access will be connected to a unified IP-based core network.The integration of existing and emerging heterogeneous wireless networks requires the design of intelligent vertical handoff techniques to enable mobile users to switch network access points and experience uninterrupted service continuity.During the vertical handoff procedure,handoff decision is a crucial issue for an efficient mobility.The definition and key concept of vertical handoff are given and its categories are introduced.Subsequently,the authors classify the vertical handoff decision algorithms into three main categories and overview their basic principles.Especially,the features of these three categories of algorithms are analyzed and compared.Finally,future works about vertical handoff are outlined.

Key words: heterogeneous wireless networks, vertical handoff, horizontal handoff, handoff decision, handoff

王煜炜,刘敏,房秉毅. 异构无线网络垂直切换技术综述[J]. 通信学报, 2015, 36(Z1): 224-234.

Yu-wei WANG,Min LIU,Bing-yi FANG. Survey on vertical handoff in heterogeneous wireless networks[J]. Journal on Communications, 2015, 36(Z1): 224-234.

图/表 3

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