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Backwards Explicit Congestion Notification ( BECN ) Rm-cell may be generated by the network or the destination .

后向明确拥塞通知（BECN）源管理（RM）信元可以由网络或目的设备生成。

The characteristic relations has becn developed and it is very suitable to use the Courant difference method with the guarantee condition of convergence .

经特征变换后，采用收敛和稳定性均有保证的Courant差分格式进行数值计算，克服了对称差分格式在处理线路边界条件时的困难。

Backward ECN ( BECN ) suggests a congested router to directly return the congestion information to the sender through ICMP source quench ( ISQ ) messages to reduce the reaction time to congestion .

其中，后向显式拥塞指示（BECN）建议拥塞的路由器直接把拥塞信息通过ISQ返回给发送端，以减少对拥塞的反应时间。

In this thesis , the advantages and disadvantages of the current prevalent congestion control algorithms are discussed in detail . Based on some general AQM algorithms such as RED , REM , RED / ECN and RED / BECN , an improved congestion control scheme is proposed .

本文在对当前几种流行的主动队列管理算法&RED，REM，RED/ECN以及RED/BECN进行详细的分析基础上，总结出当前拥塞控制算法的优势和不足，并提出了一种更优化的解决方案。

Since both ECN and BECN have advantages and disadvantages , the combination may to enhance the effectiveness of the congestion indication . The algorithm can be compatible with Relative Rate Marking Algorithm , that is to say the algorithm can also work well in the relative rate marking switch .

ECN和BECN在指示拥塞的过程中各有优缺点，二者的综合可望提高拥塞指示的效率.这种算法可以兼容ATM论坛提出的相对速率控制算法，在现有的相对速率标记交换机中一样可以很好地工作，不会产生不兼容的情况。通过仿真发现，多比特拥塞指示算法在性能上更加优越。