The main drawback of classic congestion control algorithms for abr service is that they are based on heuristics that do not have a formal theory to back them and / or depend on a number of measurements that are either difficult to perform , or have a significant amount of noise in their estimates 传统的abr业务拥塞控制方案基于启发式法则而没有正式的理论支持，并且依靠一系列的测量值，这些测量值要不是很难测量就是在估计时参生显著的噪声。
The performance evaluation ( abr . as pe ) plays an important role in establishing modern enterprise system and changing the role of government from a direct controller to an indirect supervisor . the theoretical research and practice of pe in china have developed greatly in recent years 近年来，我国的企业经营业绩评价理论研究与实践工作均取得了很大的进展，相关评价体系得以建立，企业经营业绩评价在一定范围与领域内取得了可观的成果。
Although the simplicity of binary flow control is very attractive , the queue length and allowed cell rate ( acr ) controlled by the standard efci algorithm oscillate with great amplitude , which must have negative impact on the performance , so its applicability was doubted 尽管二进制abr流量控制的简洁性具有相当的吸引力，但标准的efci算法控制的队列长度和允许信元速率( acr )却易出现大幅振荡的现象，这势必会降低链路的利用率，严重影响交换机的性能。
Thirdly , through the combination of fuzzy logic and fid , the paper designs three fuzzy fid controllers and applies them in congestion control of binary abr service successfully . they are direct - action - type fuzzy fdd controller , fuzzy self - tuning fed controller and fuzzy immune fid controller 将模糊逻辑与pid技术相结合，研究设计了直接控制量模糊pid控制器、模糊自适应整定pid控制器及模糊免疫pid控制器，并将其成功地应用于二进制abr流的拥塞控制。
Therefore this paper proposes the delay equalization algorithm which can both guarantee the qos of high priority traffic and effectively reduce the delay of ubr traffic in broadband satellite network . it is based on the prediction and equalization the delay of vbr or abr traffic so that the saved slots can be allocated to ubr traffic . the approach of dynamic alternation slots between vbr and ubr traffic can improve the mean tdma frame utilization while reducing the delay of ubr traffic 因此本文在基于流量估计的资源调度算法基础上,提出了一种在宽带卫星网络下能够保证高级别类业务qos ,同时又能够有效地降低ubr业务时延的时延均衡( delayequalization )调度算法,它是基于对vbr或abr业务时延的预测,均衡时延的方法,保证vbr或者abr业务qos的同时,将节省的时隙分配给ubr业务。
