如何在保证网络服务等级（QOS）的前提下尽可能的降低成本是移动网络运营商提高自身竟争力的关键也是本文的重点所在。
How to minimize the financial cost of the infrastructure without sacrificing QOS are the key topic of the survival of mobile service provider and also the key topic of this thesis.
第三，本系统将所有用户进行等级划分，这一举措既满足了不同客户个性化的服务需求，同时也在一定程度上保护了铁路自身的利益，保证了铁路的正常运营和调度；
Third, in this system, we differentiate all customers into some grades, and that can provide different customer the different service, meanwhile it also can provide the railway's benefits;
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