谁能介绍下伞切??谢谢啦！！！

没听过，同求指导

不知道     等答案

没听过，同求指导
大虾快点来吧

就查到这么点:

A layer with micro cells is covered by at least one macro cell, and a micro cell can in turn cover several Pico cells, the covering cell is called an umbrella cell. If there are very small cells and a user is crossing the cells very quickly, a large number of handovers will occur among the different neighboring cells. The power level inside an umbrella cell is increased compared to the micro cells with which it is formed. This makes the mobile to stay in the same cell (umbrella cell) causing the number of handovers to be decreased as well as the work to be done by the network.
 
基本就是在macrocell和microcell并存情况下, 一个macrocell包含若干microcell时的切换, 期望切换尽量在宏蜂窝里, 以减少切换次数, 具体算法和参数我也不懂

第一次听说伞切。。。。不懂。。。

来学习学习！

这种切换其实就是适用于快速移动的移动台。避免在宏站之间切换。

第一次听说

初步理解是：先占上一个话务集的小区，然后通过算法散播到后其他小区

这也是切换的一种吗，以后多看看这方面的书了

伞切，是非同层切换，比如GSM900和1800，在此情况下PBGT将失效

伞状切换：优先级最高。通常运用在双频网中。开启伞状切换时，邻区电平一达到设定的门限值就发生切换。