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December 12, 2009

昨天急着赶路,没时间详细说。为什么会有电波抓不住列车的事情呢?协和号高速列车一个小时也不过跑170到220公里(咦?搜狗怎么看见220,就认为gongli应该是“宫里”不是“公里”?你们的HMM是用辫子戏训练出来的?),电波可是一秒跑30万公里的。要是电波抓不住手机,那我们的列车就是银河铁道999,我们也不用去非洲挖矿了,直接移民人马座。

有点手机常识的人都知道,手机是和基站通信的,各个基站各管一片地方,很多基站管理的区域,组成类似蜂窝的系统覆盖地球表面。所以在美国,手机不叫handphone叫cellphone。在手机运动的时候,如果跨越基站管理区域的边界,那么在两个基站之间会有交接工作,把手机的通信从离开的那个区域的基站交给进入区域的基站。

当然实际的操作比这个复杂多了,比如一个地方三个基站覆盖怎么办?手机去问谁?你去问问丁磊关于魔兽,就知道有多复杂了。

扯远了,接着说基站和手机。手机运动的快了,在切换基站的时候,就会发生基站处理不过来的事情:这边基站还在跟另外一个基站商量谁管这个手机的时候,手机已经跑过去了。

不过,列车再快,和汽车的速度也差不了多少,那么既然高速公路上面开车打手机没问题,为什么高速列车上面打手机就有问题呢?

3 Comments »

  1. 娱(愚)记水平太差不要生气。
    基站覆盖不够,列车没有安微蜂窝,结果成为吹嘘车速的谈资。
    小灵通因为蜂窝范围太小是可能出现这种问题,对GSM, CDMA是不可能的。

    Comment by Robert Mao — December 13, 2009 @ 2:46 am

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