高速 PON 中基于队列管理的灵活带宽分配

IF 4 2区 计算机科学 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE Journal of Optical Communications and Networking Pub Date : 2024-09-13 DOI:10.1364/JOCN.525843
Jun Li;Guanlun Sun;Xiang Lu;Rui Lin;Lena Wosinska
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引用次数: 0

摘要

设想中的更高速无源光网络(即 ITU-T 50G PON)可支持各种对服务质量(QoS)有不同要求(如延迟和抖动)的时间敏感型业务。为实现这一目标,更高速的 PON 在每个传输容器(T-CONT)中引入了多个队列,使每个队列都能承载一种时间敏感型流量。然而,在现有的动态带宽分配(DBA)方案中,光线路终端(OLT)中的 DBA 引擎根据四类 T-CONT 的缓冲区占用率和优先级分配带宽,而不考虑队列状态(如队列中的数据帧数量)和服务的 QoS 要求。为支持属于同一 T-CONT 的多种服务,每个光网络单元(ONU)中的流量调度器采用基于优先级的调度策略,进一步将 T-CONT 的带宽分配给相关队列。这样,带宽由 DBA 引擎和流量调度器独立分配给队列,无法保证网络性能,也无法满足时间敏感型业务对 QoS 的严格要求。为解决这一问题,我们提出了一种基于灵活队列管理(FQM)的 DBA 机制,可根据队列的 QoS 要求将带宽直接分配给队列。拟议的 FQM 机制使 DBA 引擎能够根据现有的报告/拨款机制,获取不同队列中数据帧的到达时间和 QoS 要求以及队列状态。利用这些参数,可计算出每个队列在下一个轮询周期所需的带宽。然后,DBA 引擎会根据这些队列的带宽请求和优先级定期为其分配带宽。仿真结果表明,在满足对时间敏感的服务的各种 QoS 要求方面,即使流量负载很高,所提出的方案也优于两个基准。
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Flexible-queue-management-based bandwidth allocation in higher-speed PONs
Higher-speed passive optical networks (i.e., ITU-T 50G PONs) are envisioned to support various time-sensitive services with diverse quality of service (QoS) requirements (e.g., latency and jitter). To achieve this goal, higher-speed PON introduces multiple queues in each transmission container (T-CONT) so that each queue can carry a type of time-sensitive traffic. However, in the existing dynamic bandwidth allocation (DBA) schemes, the DBA engine in the optical line terminal (OLT) allocates bandwidth to four types of T-CONTs based on their buffer occupancies and priorities without considering queue status (e.g., the amount of data frames in queues) and services’ QoS requirements. To support multiple services belonging to the same T-CONT, the traffic scheduler in each optical network unit (ONU) further assigns the bandwidth of T-CONTs to their associated queues by using priority-based scheduling strategies. In this way, the bandwidth is allocated to queues by the DBA engine and traffic scheduler independently, which cannot guarantee network performance and meet the stringent QoS requirements of time-sensitive services. To solve this problem, we propose a DBA mechanism based on flexible queue management (FQM) to enable direct allocation of bandwidth to the queues under their QoS requirements. The proposed FQM mechanism enables the DBA engine to obtain the arrival time and QoS requirements of data frames in different queues as well as queue status based on the existing report/grant mechanism. By using these parameters, the required bandwidth for each queue in the next polling cycle can be calculated. Then, the DBA engine allocates bandwidth to these queues according to their bandwidth requests and priorities periodically. Simulation results show that the proposed scheme outperforms two benchmarks in the aspects of meeting time-sensitive services’ diverse QoS requirements, even when the traffic load is high.
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来源期刊
CiteScore
9.40
自引率
16.00%
发文量
104
审稿时长
4 months
期刊介绍: The scope of the Journal includes advances in the state-of-the-art of optical networking science, technology, and engineering. Both theoretical contributions (including new techniques, concepts, analyses, and economic studies) and practical contributions (including optical networking experiments, prototypes, and new applications) are encouraged. Subareas of interest include the architecture and design of optical networks, optical network survivability and security, software-defined optical networking, elastic optical networks, data and control plane advances, network management related innovation, and optical access networks. Enabling technologies and their applications are suitable topics only if the results are shown to directly impact optical networking beyond simple point-to-point networks.
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