移动网自适应业务的CAC算法研究

宽带移动网络中的连续媒体流业务能够根据无线链路质量和小区负载情况自适应调整其源速率，因而使网络容量具有一定的弹性。自适应业务的CAC算法既要能保护用户的QoS降级期小于一定上限，从而保护用户的Qos；又要尽量提高接入率以充分利用无线资源。本文提出了一种基于滑动窗口的CAC算法，仿真结果表明该算法获得的接入率明显高于固定门限算法，并且能够有效的保护自适应业务的QoS。

A study on CAC of adaptive service in mobile network

The media stream traffic in broadband mobile network has the ability of adapting its source rate to the quality of wireless link and the cell load, which makes the capacity of network elastic. The CAC algorithm of adaptive service should keep the QoS degradation period below a certain upper limit to protect the QoS of users. On the other hand, it should improve the call accept ratio as much as possible to maximize the efficiency of radio resources. A new CAC algorithm based on sliding window is proposed in this paper. Simulation results show that this algorithm can get a much higher accept ratio than algorithms based on threshold, and can also effectively protect the QoS of adaptive service.