The terminals in the system may need vertical handover between different access modes because of varous reasons.
系统终端会因为各种原因需要在不同接入技术之间进行垂直切换。
参考来源 - 一种异构无线通信系统垂直切换分析方法
垂直切换 - 引用次数：1参考来源 - 基于移动IPv6的流切换协议的设计与实现 in C
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Vertical handover
abstract:Vertical handover or vertical handoff refers to a network node changing the type of connectivity it uses to access a supporting infrastructure, usually to support node mobility. For example, a suitably equipped laptop might be able to use both a high speed wireless LAN and a cellular technology for Internet access.