异构网络环境下多径并行传输若干关键技术研究
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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。
With the rapid development of ubiquitous networks from level interconnection to level cooperation, the heterogeneity for different networks and multi-access characters for multi-interface terminals provide the basis and conditions for the concurrent multipath transfer by multiple access methods in the network overlapped areas. Concurrent multipath transfer system can improve the utilization of network resource effectively and enhance capacity of transmit rate and load balancing by aggregating multi-access transmission performance. In addition, using a single interface is often insufficient to meet the requirements of popular, especially for bandwidth intensive services. In order to make full use of a wide variety of surrounding user devices, and further to provide users with real-time, high efficiency and high quality services, it has become a necessary demand for a variety of terminals to work together and jointly provide services.
In this dissertation, the packet reordering in concurrent multipath transfer of heterogeneous networks, the fairness of network resource allocation, congestion control mechanisms and concurrent muti-streaming transfer system based on multi-terminals cooperation are discussed. In addition, the architecture and optimization algorithms of concurrent multipath transfer based on virtual terminal are proposed. Furthermore, an analysis model for packet reordering and a multi-user multi-terminal multipath transmission optimization model are also studied in order to optimize the system performance. The concrete contents of this dissertation are given in details as follows:
1. In order to analyze the fundamental behavior and influencing factors of packet reordering, several sets of simulation-based multipath experiments are conducted with different aggregating paths. In addition, the relationship between reordering and number of paths is discussed. Furthermore, an end-to-end measurement study of packet reordering in concurrent multipath transfer is presented. To simply the analysis process, a cumulative distribution function of transmission delay for each packet is used. The model is proved to be an effective one by contrastive analysis. What's more, some solutions to handle it are provided with a further discussion. Finally, based on the model an optimal throughput optimization analysis model for concurrent multipath transfer is proposed by minimizing the reordering time in the receiver.
2. To resolve the fairness problem of bottleneck links in concurrent multipath transfer system, the design principle of congestion control as well as the characteristic and fairness for concurrent multipath transfer is analyzed. In the meanwhile, an overview of the existing multipath congestion control methods is summarized and some open research problems are also stated. According to the characteristics of multi-user multi-terminal multi-path transmission, a transmission control model is proposed based on the network utility optimization. Furthermore, a distributed algorithm for solving the optimization problem is designed, and the stability of the system is verified.
3. In order to solve the resource and capacity insufficient in a single terminal, a multi-terminal based collaborative virtual terminal system is proposed. Collaborating with multiple devices in their surroundings and aggregating capacities adaptively is an effective way to improve the user's experience. The problem of traffic flow assignment in this collaborating system is studied and the architecture for the virtual terminal system is also proposed. Based on queuing theory, the system model is analyzed by the optimization algorithm with the overall system delay and packet loss rate as the performance evaluation. The performance results demonstrate that this system can effectively improve the transmission performance of different types of applications, thus meeting the user's quality of experience.
4. According to theoretical research, a key technology verification and demonstration platform for multi-terminal cooperation and concurrent multi-stream transfer is proposed. In this platform, the heterogeneous network convergence, Wi-Fi based independent service discovery and application layer concurrent multi-stream transmission control method are studied respectively. Through an analysis of typical application scenarios, this dissertation provides some viable solutions for the expanding and applying of related technology. What's more, this platform can also verify the typical key technologies and give some performance evaluations.
In conclusion, all the research work in this dissertation lays an import foundation for the modeling architecture, protocol design and practical applying of muti-terminal cooperation and concurrent multipath transfer in the heterogeneous networks environment, and provides theoretical support for the implement of intelligence application in ubiquitous networks.
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。
With the rapid development of ubiquitous networks from level interconnection to level cooperation, the heterogeneity for different networks and multi-access characters for multi-interface terminals provide the basis and conditions for the concurrent multipath transfer by multiple access methods in the network overlapped areas. Concurrent multipath transfer system can improve the utilization of network resource effectively and enhance capacity of transmit rate and load balancing by aggregating multi-access transmission performance. In addition, using a single interface is often insufficient to meet the requirements of popular, especially for bandwidth intensive services. In order to make full use of a wide variety of surrounding user devices, and further to provide users with real-time, high efficiency and high quality services, it has become a necessary demand for a variety of terminals to work together and jointly provide services.
In this dissertation, the packet reordering in concurrent multipath transfer of heterogeneous networks, the fairness of network resource allocation, congestion control mechanisms and concurrent muti-streaming transfer system based on multi-terminals cooperation are discussed. In addition, the architecture and optimization algorithms of concurrent multipath transfer based on virtual terminal are proposed. Furthermore, an analysis model for packet reordering and a multi-user multi-terminal multipath transmission optimization model are also studied in order to optimize the system performance. The concrete contents of this dissertation are given in details as follows:
1. In order to analyze the fundamental behavior and influencing factors of packet reordering, several sets of simulation-based multipath experiments are conducted with different aggregating paths. In addition, the relationship between reordering and number of paths is discussed. Furthermore, an end-to-end measurement study of packet reordering in concurrent multipath transfer is presented. To simply the analysis process, a cumulative distribution function of transmission delay for each packet is used. The model is proved to be an effective one by contrastive analysis. What's more, some solutions to handle it are provided with a further discussion. Finally, based on the model an optimal throughput optimization analysis model for concurrent multipath transfer is proposed by minimizing the reordering time in the receiver.
2. To resolve the fairness problem of bottleneck links in concurrent multipath transfer system, the design principle of congestion control as well as the characteristic and fairness for concurrent multipath transfer is analyzed. In the meanwhile, an overview of the existing multipath congestion control methods is summarized and some open research problems are also stated. According to the characteristics of multi-user multi-terminal multi-path transmission, a transmission control model is proposed based on the network utility optimization. Furthermore, a distributed algorithm for solving the optimization problem is designed, and the stability of the system is verified.
3. In order to solve the resource and capacity insufficient in a single terminal, a multi-terminal based collaborative virtual terminal system is proposed. Collaborating with multiple devices in their surroundings and aggregating capacities adaptively is an effective way to improve the user's experience. The problem of traffic flow assignment in this collaborating system is studied and the architecture for the virtual terminal system is also proposed. Based on queuing theory, the system model is analyzed by the optimization algorithm with the overall system delay and packet loss rate as the performance evaluation. The performance results demonstrate that this system can effectively improve the transmission performance of different types of applications, thus meeting the user's quality of experience.
4. According to theoretical research, a key technology verification and demonstration platform for multi-terminal cooperation and concurrent multi-stream transfer is proposed. In this platform, the heterogeneous network convergence, Wi-Fi based independent service discovery and application layer concurrent multi-stream transmission control method are studied respectively. Through an analysis of typical application scenarios, this dissertation provides some viable solutions for the expanding and applying of related technology. What's more, this platform can also verify the typical key technologies and give some performance evaluations.
In conclusion, all the research work in this dissertation lays an import foundation for the modeling architecture, protocol design and practical applying of muti-terminal cooperation and concurrent multipath transfer in the heterogeneous networks environment, and provides theoretical support for the implement of intelligence application in ubiquitous networks.
引文
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