多业务网络动态带宽分配算法研究

Dynamic Bandwidth Allocation Algorithm for Multi-Service Network

在多业务网络环境中,面对不同的QoS需求,为不同业务分配合理的带宽资源是提高网络效率的有效保障。探讨了多业务网络环境下的带宽资源管理办法。重点研究了区分业务模型Diffserv中相关队列调度算法的基本原理,并对加权循环算法WRR进行改进。在基于周期测量发送队列的基础上对队列分配权值进行动态调整,使高优先级业务能够得到充分带宽资源保证的同时,对低优先级业务也有最低的传输带宽保证,从而满足多个业务的共同需求。通过NS2仿真和分析表明,经过改进的算法能对多业务环境下的数据传输提供区分服务,并且使得高优先级业务在丢包数和数据延迟方面与低优先级业务相比有明显减少。

In the multi-service network,with different requirements of QoS,the reasonable allocation of bandwidth to different services could improve the efficiency of network.The paper describes the bandwidth resources management way for multi-service network,and focuses on the basic principle of queue scheduling algorithm based on Diffserv model.The WRR algorithm is improved,the weight based on the cycle measurement dynamically adjusted,thus ensuring the enough bandwidth for high-priority service while the minimum transmission bandwidth for low-priority service.Finally,the simulation with NS2 shows that the algorithm can offer differentiated service of data transmission in multi-service environment,and the packet-loss data-delay of high-priority service is obviously less than those of low priority service.