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.
确定各种网络服务或应用服务的SLA（服务等级协约）参数是实施SLA管理的前提之一。
To enforce SLA(Service Level Agreement) management, SLA metrics for network services or application services must be established in advance.
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