在网络设计中，为了保证网络服务质量，需要对网络节点间的跳数进行限制。
In order to maintain the quality of service, it is necessary to add some hop-constrain between nodes in network.
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.
其中RTP协议负责数据传输，RTCP协议负责提供数据传输质量反馈，RSVP协议用于资源预留，以保证网络服务质量，RTSP协议则提供数据传输的远端控制。
RTP transmit data, and RTCP provide feedback of data transmission quality. RSVP can reserve network bandwidth to guarantee quality of service. RTSP remotely control data transmission.
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