基于网络编码的无线协作数据交换延迟最优化机制的研究

项目名称： 基于网络编码的无线协作数据交换延迟最优化机制的研究

项目编号： No.61300212

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 自动化技术、计算机技术

项目作者： 汪秀敏

作者单位： 合肥工业大学

项目金额： 23万元

中文摘要： 新型网络应用和服务的不断涌现使网络用户数量和用户对带宽的需求量持续增长，因此，设计高效的传输策略以缓解网络的高通信量成为当前研究的重要议题。研究显示，利用小范围内的无线协作数据交换不仅可以满足用户的需求，而且可以缓解服务器端的通信瓶颈。本项目拟开展基于网络编码的协作数据交换过程，通过利用网络编码在无线网络吞吐量上的优势和考察无线发送速率对传输延迟等的影响，设计低延迟、高效的协作数据交换机制。具体研究内容包括：1）在单速率无线环境下，研究具有时延约束的协作数据交换过程，设计高效的协作数据交换策略以满足尽可能多的数据包能在时延要求前顺利被接收；2）在多速率无线环境下，分析发送速率选择对数据交换过程中传输延迟的影响，并在此基础上进一步优化传输延迟；3）研究无线发送速率选择对具有时延约束的协作数据交换过程的影响，拟通过速率选择尽可能满足数据包的时延约束，并在此基础上进一步最优化协作数据交换代价。

中文关键词： 无线网络；网络编码；传输延迟；速率调整；

英文摘要： In recent years, there has been a growing demand in large file downloads and video applications for wireless clients. However, it is not efficient for all the clients to download all the files from the servers directly, as the heavy load might be suffered at the servers. Inspired by peer-to-peer content delivery systems, one solution to address these issues is to allow wireless clients to cooperatively exchange data among themselves, named cooperative data exchange. In cooperative data exchange, each client initially holds a subset of packets, and wants all the packets that others have. Recent literatures on cooperative data exchange got good results on optimizing the total number of transmissions, the total tranmsission cost and etc, during data exchange process. However, none of work studies the minimum tranmsission delay, which is especially important for video applications. In this project, we aim to propose a delay efficient cooperative data exchange scheme, which exploits the benefits of both network coding and wireless tranmsission rate selection. The detail researches include: 1) for time critical applications, the cooperative data exchange scheme to be proposed is to maximize the total number of packets that are received/decoded at the clients without missing their deadlines; 2) under the circumstance

英文关键词： wireless networks；network coding；transmission delay；rate adaptation；