异构网络环境下多径并行传输若干关键技术研究

发布时间：2018-06-21 04:32

本文选题：泛在网 + 多径并行传输　；参考：《华东理工大学》2014年博士论文

【摘要】：随着泛在网络由泛在互联阶段向泛在协同阶段演进,网络的异构性及终端的多接入特性为终端在网络重叠覆盖区域通过多种接入方式并行传输提供了基础及条件。多径并行传输系统,通过聚合多条链路的传输性能,可以有效提升网络资源利用率,提高业务传输速率及负载均衡能力。另外,通过及时将传输中断链路的数据迁移到其他并行链路可以有效提升网络的鲁棒性,保证数据可靠性。另一方面,当单个终端的能力受限无法完成特定的功能需求时,通过协同其周边环境多个终端设备形成一个能力增强、接口增多的虚拟大终端,成为解决终端资源受限与用户服务需求之间矛盾的突破口。本文针对异构网络环境下多径并行传输中的数据包乱序、网络资源公平性分配、拥塞控制机制、多终端协同业务传输等关键技术进行了研究,提出了基于虚拟终端的多径并行传输架构及优化方法、端到端多径并行传输乱序分析模型、基于网络效用的多用户多终端多径传输优化模型等,并通过搭建实验平台对以多终端协同为主要应用场景的异构终端设备及服务互发现、协作网络搭建及维护以及应用层实现的多流业务并发传输等关键技术进行了验证。主要研究工作包括以下几点： 1.针对多径并行传输中影响传输性能的数据包乱序问题,通过多组仿真实验对多组场景的多个影响因素进行了分析。对多径并行传输中的数据包乱序产生原因、影响因素以及对系统造成的危害进行了系统的分析。基于以上分析,提出了基于累加概率分布的端到端数据包乱序分析模型,通过该模型可以很好的模拟真实网络环境的乱序情况,利用模型分析结果提出了解决数据包乱序的多种方法。最后,基于该模型通过最小化重排序时间获取多径传输系统最优吞吐的优化分析模型。 2.为解决多径并行传输中所面临的瓶颈链路公平性问题,本文对多路径拥塞控制的设计原则进行分析,根据设计原则要求讨论现有多路径拥塞控制算法的性能,提出多路径传输拥塞控制算法设计原则,在保证网络资源公平的前提下,提升系统的整体性能,实现多路径传输效率的最大化。根据多用户多终端多路径传输特点,设计网络效用最优化的传输控制模型,通过设计分布式算法求解模型最优解,并验证了系统的稳定性。 3.为解决单个终端在资源及能力上的不足,提出一种基于多终端协同的虚拟终端系统,基于该系统研究聚合终端的多路径并发传输控制。针对虚拟终端系统中如何实现多径并行传输过程中的业务流控制问题,利用排队论等理论工具建模该系统并通过优化分析给出不同业务类型需求下的分流控制解决方案,提升系统的传输性能。 4.在上述研究的基础上,本文搭建多终端协同及多流并发传输关键技术验证演示平台,分别对异构网络融合、基于Wi-Fi通信协议自主服务发现及组网和应用层实现的多流并发传输控制方法进行研究,通过对典型应用场景的分析为相关技术的推广及应用提供可行的解决方案,并对本文研究的典型关键技术进行可行性验证和性能评估。以上研究成果,对异构网络环境中多终端协同及多路径并行传输系统在建模、架构、协议设计和实际应用方面奠定了重要基础,为泛在网络环境下的协同智能类应用的实施提供了理论支撑。
[Abstract]:The multi - path parallel transmission system can effectively improve the network resource utilization rate and improve the service transmission rate and the load balancing ability by aggregating the transmission performance of a plurality of links .

This paper studies the key technologies of multi - path parallel transmission architecture and optimization method based on virtual terminal , multi - user multi - terminal multi - path transmission optimization model based on virtual terminal , multi - user multi - terminal multi - path transmission optimization model based on virtual terminal , multi - user multi - terminal multi - path transmission optimization model based on network utility , etc .

1 . Based on the above analysis , this paper presents an analysis of several factors affecting transmission performance in multi - path parallel transmission . Based on the above analysis , a sequence analysis model of end - to - end data packet based on accumulation probability distribution is presented . Based on the above analysis , several methods are proposed to solve the disorder of the real network environment . Finally , the optimization model of optimal throughput of multi - path transmission system is obtained based on the model by minimizing the reordering time .

2 . In order to solve the bottleneck link fairness problem faced in multi - path parallel transmission , this paper analyzes the design principle of multi - path congestion control , discusses the performance of the existing multi - path congestion control algorithm according to the design principle , proposes the design principle of multi - path transmission congestion control algorithm , and improves the overall performance of the system under the premise of guaranteeing the fairness of network resources .

3 . In order to solve the shortage of resources and capability of a single terminal , a multi - terminal cooperative virtual terminal system is proposed . Based on the system , the multi - path concurrent transmission control of the aggregation terminal is studied . In view of how to realize the traffic flow control problem in the multi - path parallel transmission process in the virtual terminal system , the system is modeled by using the theory tools such as queuing theory and the shunt control solution under different service types needs to be given through optimization analysis , and the transmission performance of the system is improved .

4 . Based on the above research , this paper sets up a demonstration platform for the key technology of multi - terminal coordination and multi - stream concurrent transmission , and studies the multi - stream concurrent transmission control method realized by heterogeneous network convergence , self - service discovery based on Wi - Fi communication protocol , networking and application layer , and provides a feasible solution for the popularization and application of the related technologies by analyzing typical application scenarios , and feasibility verification and performance evaluation are carried out for typical key technologies in this paper .

The results show that the multi - terminal coordination and multi - path parallel transmission system in the heterogeneous network environment lays an important foundation for modeling , architecture , protocol design and practical application , and provides theoretical support for the implementation of the cooperative intelligent class application under the network environment .
【学位授予单位】：华东理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TP393.06

【参考文献】