| 引用本文: | 杨湘,王伟平,王建新.流间网络编码中的自适应通知报文发送机制.[J].国防科技大学学报,2017,39(2):120-127.[点击复制] |
| YANG Xiang,WANG Weiping,WANG Jianxin.Adaptive reception reports sending mechanism in inter-session network coding[J].Journal of National University of Defense Technology,2017,39(2):120-127[点击复制] |
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| 流间网络编码中的自适应通知报文发送机制 |
| 杨湘1,2, 王伟平1, 王建新1 |
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(1. 中南大学 信息科学与工程学院， 湖南 长沙 410083;2.
2. 武汉科技大学 计算机科学与技术学院， 湖北 武汉 430081)
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| 摘要: |
| 流间网络编码机制需要借助通知报文来确定编码机会，现有的机制一般采用“τ间隔通知机制”，但对通知间隔τ的选取及其导致的开销并未进行分析。通过分析“τ间隔通知机制”所产生的通信开销及其对编码机会和吞吐量的影响，提出一种自适应通知报文发送机制。在自适应通知报文发送机制中，无线节点根据局部网络的流量自适应地确定发送间隔，且通知报文仅携带最近2个通知间隔侦听到的数据包信息，在保证编码机会的情况下降低通知报文中携带的信息量和通知报文的发送频度，从而降低附加开销和冲突。网络模拟器仿真实验结果表明：自适应通知报文发送机制能有效地减少通知报文发送的额外带宽开销，取得比采用“τ间隔通知机制”的流间编码机制更高的吞吐量。 |
| 关键词: 流间网络编码 侦听数据包 通知报文 |
| DOI：10.11887/j.cn.201702018 |
| 投稿日期：2015-11-03 |
| 基金项目:国家自然科学基金资助项目（61173169，61402542，61502359） |
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| Adaptive reception reports sending mechanism in inter-session network coding |
| YANG Xiang1,2, WANG Weiping1, WANG Jianxin1 |
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(1. School of Information Science and Engineering, Central South University, Changsha 410083, China;2. School of Computer Science and Technology, Wuhan University of Science and Technology, Wuhan 430081, China)
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| Abstract: |
| The existing inter session network coding mechanisms almost unanimously adopt “τ-interval-notification”, which is used to determine the coding opportunities, and its overhead has not been analyzed. In the current study, its communication overhead and its impacts on coding opportunity and throughput were analyzed, and an adaptive reception report sending mechanism called AR2SM (Adaptive Reception Reports Sending Mechanism) was proposed. In AR2SM, the interval of broadcasting reception reports is determined adaptively according to the traffic of local network, and the reception reports carry the packets overheard in the last 2 intervals. As a result, the size of reception report and the frequency of sending reception report were both reduced on the condition of guaranteeing the coding opportunity. According to the simulator results in network simulator, the proposed mechanism reduces the overhead of transmitting the reception reports, and achieves higher throughput than the “τ-interval-notification” mechanism. |
| Keywords: inter-session network coding overheard packet reception report |
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