Based on "ALL IP" network background in communication system, the packet network as a unified bearer network will face new problems of synchronization need.

在通信系统全网IP化的大背景下，分组网络作为统一承载网将面临新的同步需求问题。

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Presently, Mobile Communication Company's GPRS network that based on the 2.5 G can supply packet radio service and low cost service of wireless transmission.

目前，移动公司建成的基于2.5代移动通信gprs网络能够提供端到端的无线分组交换数据业务，提供低成本的数据无线传输业务。

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Finally, it emphatically describes the international proposals on new generation communication network for the next century, including the packet-based core network and broadband access networks.

然后着重介绍了国际上对新世纪初准备实现的新一代国家通信网基础结构的具体设想，其中包括以分组为基的核心网和各种宽带接入网。

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