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计算机工程 ›› 2007, Vol. 33 ›› Issue (24): 4-6. doi: 10.3969/j.issn.1000-3428.2007.24.002

• 博士论文 • 上一篇    下一篇

基于优先级的混合自动请求重传方法

姜 戬1,刘 敏1,徐 刚1,马 建2,张冬梅

  

  1. 1. 中国科学院计算技术研究所,北京 100080;2. 诺基亚中国研究中心,北京 100013
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-12-20 发布日期:2007-12-20

Algorithm for Hybrid Automatic Repeat Request Based on Priority

JIANG Jian1, LIU Min1, XU Gang1, MA Jian2, ZHANG Dong-mei2   

  1. 1. Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100080; 2. Nokia Research Center(China), Beijing 100013
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-12-20 Published:2007-12-20

摘要: 提出了一种基于优先级的混合自动请求重传(HARQ)方法,该方法基于多用户N通道等停异步模式HARQ。无线视频传输时每个数据块有不同的时延要求,为了减少时延在物理层对数据块传输顺序进行调整,通过重传数据块等待的时间来决定其优先级,对等待时间较长的数据块优先传输。通过对这种方法的理论分析和仿真实验,证明其在基于QoS保障无线视频传输信道条件较差情况下能有效地减少端到端的时延和丢包率。

关键词: 混合自动请求重传, 优先级, 多用户N通道等停

Abstract:

This paper introduces a novel retransmission scheme for hybrid automatic repeat request (HARQ) based on priority, this method is used for asynchronous HARQ of multi-user N channel stop and wait mechanism. Because video transmission over wireless is sensitive to packet delay, in order to reduce packet delay retransmission, it calculates the priority based on retransmission waiting time and regulation the order about transmission, transmits packet which has longer waiting time with higher priority. According to theoretical analysis and simulation about this scheme, it can effectively reduce the end to end delay and pack loss for video retransmission over wireless channel under the circumstance of bad channel status so as to meet QoS assurances.

Key words: hybrid automatic repeat request (HARQ), priority, multi-user Nchannel stop and wait

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