永远在线方案研究

[摘要] 通过分析永远在线业务对移动网络带来的问题，创新性地从网络系统角度提出了一种移动网络对永远在线业务的服务机制。该机制基于策略及计费控制(PCC)架构，由永远在线业务服务器通知PCC系统对该永远在线业务流进行网络地址转换(NAT)保活及承载通道保活控制，以此实现移动网络对永远在线业务的承载通道及NAT资源的有效保证，降低永远在线业务对网络负荷的影响，从而提高网络的利用率。

[关键词] 永远在线；PCC；策略与计费规则功能；端口控制协议；NAT

[Abstract] This paper discribes mobile network problems caused by always-online services. We propose a mechanism for implementing the always-online service in the mobile network, from a network point of view. The mechanism, based on the policy and charging control (PCC) architecture, allows the server to tell the PCC system to implement NAT keep-alive and bearer-channel keep-alive. These guarantee that the bearer channels and network address translation (NAT) resources are available for the always-online service. The mechanism reduces the effect of the service on network load and improves network use.

[Keywords] always online; PCC; policy and charging rules function(PCRF); port control protocol (PCP);NAT