摘要： 通过分析和仿真研究通知服务的运行性能，指出其需要过载保护，提出一种基于反馈控制的通知服务接纳控制机制，并分析了它的稳定性。对该机制进行了仿真实验，实验结果表明该机制能够在不可预测的情况下有效地控制系统负载，获得性能保证，同时使系统资源能被合理分配、有效利用。

关键词: 通知服务, 反馈控制, 过载保护, 接纳控制, 仿真

Abstract: By analyzing the simulation results of the performance of current notification service, this paper finds that the notification service needs overload protection. A feedback control based admission control of notification service is presented and the closed loop stability is analyzed. Experiments to evaluate the performance of this mechanism indicate that this mechanism can control the load and achieve performance guarantees in the presence of load unpredictability, while it can also ensure allocating and utilizing system resources reasonably and efficiently.

Key words: Notification service, Feedback control, Overload protection, Admission control, Simulation