北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2011, Vol. 34 ›› Issue (5): 101-104.doi: 10.13190/jbupt.201105.101.shuaiqj

• 研究报告 • 上一篇    下一篇

改进的EPON系统Online & Offline SPD混合调度算法

帅千钧1,2,颜金尧2,李鉴增1,黄浩程2,朱维嘉2   

  1. 1.中国传媒大学 信息工程学院, 北京 100024; 2.中国传媒大学 计算机与网络中心, 北京 100024
  • 收稿日期:2010-09-19 修回日期:2011-06-01 出版日期:2011-10-28 发布日期:2011-08-26
  • 通讯作者: 帅千钧 E-mail:sqj@cuc.edu.cn
  • 基金资助:

    国家自然科学基金项目(60970127); 新世纪优秀人才支持计划项目(NCET090709); 教育部科学技术研究重点项目(109029); 中国传媒大学工科规划项目(XNG0943)

A Modified Hybrid Online & Offline SPD First  (HSPD) Scheduling for EPONs

  • Received:2010-09-19 Revised:2011-06-01 Online:2011-10-28 Published:2011-08-26
  • Contact: Qian-Jun SHUAI E-mail:sqj@cuc.edu.cn

摘要:

为了减小以太网无源光网络(EPON)offline调度产生的上行信道空闲时间,提出了基于最小群时延优先(SPD)改进的online & offline混合调度算法,考虑到环路时延 (RTT)的影响,在请求带宽大小的基础上再结合对RTT范围的限定,进行online和offline两级分类. 数学分析和仿真结果显示,改进的混合调度算法使网络性能优于MDBA1算法,即使在中低负载的情况下,也优于offline SPD调度算法.

关键词: 无源光网络, 动态带宽分配算法, 调度, 最小群时延优先

Abstract:

In order to shorten the idle time in offline scheduling, a modified hybrid online & offline with Shortest propogation delay first based (HSPD) scheduling is proposed. Due to the round trip time (RTT) influence on the upstream idle time, a scheduling condition parameter is defined to further classify online and offline status based on the diversity of the propogation delay. The network performance is evaluated through analysis and simulation. Results indicate that HSPD scheduling achieves better performance compared with the MDBA1 algorithm and SPD first based offline scheduling especially under light or medium loaded traffic.

Key words: Ethernet passive optical networks, dynamic bandwidth allocation, scheduling, shortest propogation delay first

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