IMS核心网中基于卫星接入网络的QoS方案

QoS scheme based on satellite access network in IMS core network

作为下一代网络NGN核心网解决方案,IMS(IP多媒体子系统)可以支持多种终端接入方式,为固定网络和移动网络集成提供基础,所以IMS的带宽和时延就显得尤为重要。而卫星通信系统在地理和带宽方面具有优势,因此有必要在IMS中汇集卫星。然而,卫星信道的传播延迟问题对IMS接入的QoS(服务质量)有很大影响。在本文中,我们提出了卫星接入网络和卫星接入网关的体系结构,响应网络地址管理将卫星逻辑链路映射到IP链路,设计了用于卫星接入IMS核心网络的QoS框架,QoS控制器可以从PCEF接收会话级策略以及通信栈中其他层的跨层信息。利用这些信息,QoS控制器可以做出决策,最后提出了一种增强的QoS控制器来保证QoS的传输。通过仿真发现新方案图像的均方误差比基本方案减少了10点左右。

As the next generation network NGN core network solution,IMS(IP multimedia subsystem)can support a variety of terminal access method and provide a foundation for the fixed network and mobile network integration,and satellite communication system has its superiority in geography and bandwidth,so it is necessary to converge satellite in IMS. However,the problem of propagation delay of satellite channel has a great influence on the QoS(quality of service)of IMS access. In this paper,we propose the architecture of satellite access network and satellite access gateway. Response network address management make the satellite logical link is mapped to the IP link and design the QoS framework for satellite access to the IMS core network. The controller can receive session level policies and cross-layer information from other layers in the communicationstack from the PCEF. Using this information,the QoS controller can make decisions and finally propose an enhanced QoS controller to guarantee the transmission of QoS. Through simulation,it is found that the mean square error of the new scheme image is reduced by about 10 points compared with the basic scheme.