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多种技术制式并存是无源光网络平滑演进的必然要求,各制式系统单独运行必然存在全网资源利用率不高的问题,而不同制式间的协同调度将成为提高网络资源利用率的关键技术。本文在分析制式间带宽协同调度所面临的问题的基础上,针对性地提出了一种用于多制式环境下虚拟无源光接入网的基于人工免疫原理的多制式协同动态带宽调度算法。根据该算法可实现不同制式间的负载均衡,同时将跨制式调度引入的时延影响降到最低。进一步仿真实验表明,在高负载情况下,所提算法能很好地平衡各制式下的平均分组时延,同时全网带宽利用率得到较大提高。
The coexistence of multiple technologies and systems is an inevitable requirement for the smooth evolution of passive optical networks. Each system runs inevitably with low utilization of resources across the entire network. Coordinated scheduling among different standards will become a key technology for improving network resource utilization . Based on the analysis of the problems faced by the inter-standard bandwidth collaborative scheduling, this paper proposes a multi-standard collaborative dynamic bandwidth scheduling algorithm based on artificial immune principles for virtual passive optical access networks in multi-mode environment. According to this algorithm, load balancing among different standards can be realized, and the influence of delay introduced by cross-mode scheduling can be minimized. Further simulation shows that under high load, the proposed algorithm can well balance the average packet delay under each standard, and at the same time the bandwidth utilization of the entire network is greatly improved.