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1·Because of the enormous computation burden and data flow, user plane is usually the sticking point of cost and performance of an MGW.

在MG W中用户平面的处理由于计算量巨大，数据流量也巨大，常常成为性能和成本的关键。

2·So the overload control of MGW in Soft-Switch researched in this paper is a kind of feedback model for service traffic control mechanism which is composed by MGW and MGC together.

因此本文研究的软交换体系下媒体网关过载控制是一种由媒体网关和媒体网关控制器共同作用构成的反馈型业务流量控制机制。