Contention resolution and blocking fairness improvement based on limited delay preemption

LIU Chun-yu; ZHANG Xu-dong; ZHANG Xue; KANG Jing; YANG Jiu-ru

doi:10.3788/OPE.20172513.0228

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Contention resolution and blocking fairness improvement based on limited delay preemption

更新时间：2020-08-13

- Contention resolution and blocking fairness improvement based on limited delay preemption
- Optics and Precision Engineering Vol. 25, Issue 10s, Pages: 228-234(2017)
- 作者机构：
  
  黑龙江大学电子工程学院, 黑龙江哈尔滨 150080
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172513.0228
  CLC： TP929.11
- Received：02 May 2017，
  
  Revised：04 July 2017，
  
  Published：25 November 2017
- 稿件说明：
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柳春郁, 张旭东, 张雪等. 基于受限延迟抢占的竞争解决与阻塞公平改善[J]. 光学精密工程, 2017,25(10s): 228-234

LIU Chun-yu, ZHANG Xu-dong, ZHANG Xue etc. Contention resolution and blocking fairness improvement based on limited delay preemption[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 228-234
柳春郁, 张旭东, 张雪等. 基于受限延迟抢占的竞争解决与阻塞公平改善[J]. 光学精密工程, 2017,25(10s): 228-234 DOI： 10.3788/OPE.20172513.0228.

LIU Chun-yu, ZHANG Xu-dong, ZHANG Xue etc. Contention resolution and blocking fairness improvement based on limited delay preemption[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 228-234 DOI： 10.3788/OPE.20172513.0228.

摘要

为改善用户的阻塞公平性，提出了一种基于公平性改善的受限延迟抢占方案以同步满足光突发交换网络中高、低优先级突发的低丢弃率要求。在核心节点，依据分组到达的优先级别与实时流量状态，通过动态设定流量门限，限制阻塞条件下高优先级用户的缓存与信道占用权限，有效减少低优先级用户在高流量状态下的无效丢弃。结果表明：丢弃率与高、低优先级用户占比和流量门限设定值直接相关，当高优先级用户占比小于0.3，动态流量门限值为0.5~0.7时，所提方案可保证中、高流量状态下的阻塞率低于10

-2

，且公平性因子保持~0.95。与传统基于优先级的抢占机制相比，所提方案在支持区分服务的同时，兼顾了用户的阻塞与公平性要求，避免了因大量低优先级突发丢弃所导致的无效传输与二次阻塞，有效提升了光交换网络的实用性与可靠性。

Abstract

In order to improve blocking fairness of users

limited delay preemption scheme based on fairness improvement (LDP-FI) was proposed to satisfy the requirement of low discarding rate of high and low priority burst in optical burst switching network synchronously. In core nodes

priority level and real-time traffic states reached by LDP-FI according to groups decreased invalid discard of low priority users effectively under high traffic state by dynamic setting of traffic threshold and restriction of buffer and channel occupancy authority of high priority users under blocking condition. Numerical results show that:discarding rate is directly related to proportion of high and low priority users and set value of traffic threshold. When proportion of high priority users is less than 0.3

and dynamic traffic threshold value is 0.5-0.7

LDP-FI can guarantee that blocking rate under middle and high traffic state is lower than 10

-2

and fairness index is kept to be 0.95. Compared with traditional preemption mechanism based on priority

LDP-FI gives consideration to blocking and fairness requirements of users at the time of supporting differentiated service

avoids invalid transmission and secondary blocking caused by discard of a large number of low priority burst and improves practicability and reliability of optical switching networks effectively.

关键词

Keywords

references

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