无线Mesh网中基于网络编码的多路径TCP研究  

Study of Network Coding MPTCP in Wireless Mesh Networks

作　　者：马矿[1,2] 何加铭[1,2] 郑紫微[1] 曾兴斌[1] 樊玲慧 

机构地区：[1]宁波大学通信技术研究所,浙江宁波315211 [2]浙江省移动网应用技术重点实验室,浙江宁波315211 [3]宁波新然电子信息科技发展有限公司,浙江宁波315211

出　　处：《无线电通信技术》2014年第1期10-13,44,共5页Radio Communications Technology

基　　金：浙江省重大科技专项(2011C11042);浙江省移动网络应用技术联合重点实验室(2010E10005);浙江省移动互联网用户端软件科技创新团队(2010R50009);浙江省重点科技创新团队项目(2012R10009-11;2012R10009-20)

摘　　要：在无线多跳网络中,本地重传和网络编码已经被成功地应用到多路径技术上以增加吞吐量并减少丢包。然而,在提高UDP传输性能的同时,也产生了数据包重排序和延迟等副作用,严重影响了TCP性能。针对此问题,主要提出一种基于网络编码的多路径传输方案NC-MPTCP,即在无线mesh网络的多条路径中引入网络编码、执行拥塞控制以及使用一个基于信用的方法控制节点的传输速率,提高网络的吞吐量以及增加网络传输的可靠性。该方案使用一个简单的算法,评估丢包率以及发送线性组合数据包的速率,用来降低目的节点的数据包解码延迟和防止TCP的超时重传。仿真结果表明设计的NC-MPTCP有效。In wireless muhihop networks,local retransmissions and network coding have been successfully applied to the muhipath technology to increase throughput and reduce losses. However, while these techniques improve the performance of UDP, they also produce packet reordering and delay that seriously affect TCP performance.NC-MPTCP is then introduced,i.e.a multipath with network coding scheme that combines multiple paths and network coding, performs congestion control and uses a credit-based method for controlling the transmission rate of the nodes, which improves network throughput and reliability of network transmission in wireless mesh networks.Moreover,NC-MPTCP uses a simple algorithm to evaluate packet losses and the rate of sending linear combinations in order to reduce the decoding delay and prevent TCP timeouts and retransmissions. The simulation results verify the validity of the theoretical results in the paper.

关 键 词：网络编码 无线网络 TCP 多路径 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]