在媒体流调度中改进的DRR算法

Improved DDR algorithm in media stream scheduling

提出了模糊控制变权法多因素决策的自适应DRR算法(VWADRR)———一种改进的亏损轮询调度算法(DRR)。算法应用在调度多个媒体数据流队列时。算法基于模糊控制理论中的多因素决策,具体使用了变权法。可以自适应输出信道的带宽和输入队列的缓存余额。变权法根据可用带宽和队列缓存余额这两个因素做出决策,动态地确定DRR中的常量QN。由于考虑了每个数据包发送的时限,降低了每个数据包的延时。使系统在大流量的情况下有效利用缓存和带宽,降低缓存耗光的可能性,同时平滑了突发。

Fuzzy control variable weight method of multi-factor decision-making adaptive deficit round robin scheduling algorithm（VWADRR）,an improved deficit round robin（DRR） scheduling algorithm is put forward.It＇s used in the circumstance of scheduling multiple multi-media data streams.It bases on multi-factor decision-making in the fuzzy control theory,specific to the use of the variable weight method.It＇s adaptive for output channel bandwidth and buffer size of each input queues.Variable weight method makes decisions based on these two factors,that is,to determine the QN as variable in DRR.Considering the time of each packet sent,it reduces the packet delay.It effective uses buffers and bandwidth in the heavy network traffic situation,significantly reduces the possibility of buffer depletion,also smoothes burst.