面向重叠网络多径传输的路径管理和评价技术研究

发布时间：2018-08-05 18:12

【摘要】：3GPP在R5版本中引入的多媒体通信标准体系IMS,是下一代电信技术的主要网络架构,然而IMS媒体传输模式采用完全依赖承载网络的单径传输模式,存在着端到端QoS保证困难、传输效率低等问题,已严重制约了IMS业务发展。面向重叠网络的多径传输,被认为是实现IMS媒体传输技术升级的重要方式。为实现QoS保证的多径传输,为路径选择和负载动态分配提供依据,均需依赖于传输路径QoS的测量和评价技术。面向重叠网络多径传输的QoS评价,尚没有完善的技术方案：目前的路径QoS测量均是针对于端到端或某段链路的,无法适用于存在中继节点的多径传输路径：传统的预测估计方法虽然可以弥补测量的滞后性,但为保证不失真恢复的多次采样会给网络增加大量额外负担；相关协议方面,目前主要是基于传输层协议或者ICMP协议等,RTCP协议为针对实时传输媒体路径的QoS评价,通过统计分析时延、带宽、丢包率等内容来进行评价,无法兼顾多径传输中继节点间的消息传递。结合本文基于应用中继的多径传输场景,本文重点研究以下几个方面：1)重叠网络中继节点及路径的组织管理；2)中继节点间路径QoS测量-预测机制及协议；3)端到端传输路径QoS评价协议。本文的主要研究内容及成果如下：1]分别对重叠网络路径和中继节点进行分类描述,进而量化的表征了传输路径选择度的概念,为面向重叠网络多径传输的路径管理和路径QoS评价提供依据；2)在总结传统路径QoS评价参数及其测量方法的基础上,确定本文采用时延、可用带宽作为表征路径QoS的评价参数,通过对现有测量方法的扩展,设计出基于中继控制器的中继节点间路径QoS测量机制及其交互消息格式；3)为弥补主动测量方式的不足,通过深入分析传统预测估计算法,设计出主要基于压缩感知理论的路径QoS预测模块,并给出相应的预测估计流程；4)通过对RTCP协议进行扩展,提出多径接收端报告和多径发送端报告,其为两个携带了路径ID等参数信息的新分组类型,并给出相应的交互机制,实现端到端路径的QoS评价。最后通过基于OMNeT++仿真平台的仿真测试,验证本文提出的解决方案的普适性和准确性,能够应用于面向重叠网络的基于应用中继多径传输路径QoS的评价。
[Abstract]:The multimedia communication standard system (IMS) introduced by 3GPP in the R5 version is the main network architecture of the next generation telecommunication technology. However, the IMS media transmission mode adopts the single-path transmission mode which is completely dependent on the carrying network, so it is difficult to guarantee end-to-end QoS. Low transmission efficiency has seriously restricted the development of IMS services. Multi-path transmission for overlapping networks is considered to be an important way to upgrade IMS media transmission technology. In order to realize the multipath transmission guaranteed by QoS and to provide the basis for path selection and load dynamic distribution, it is necessary to rely on the measurement and evaluation technology of the transmission path QoS. There is no perfect technical scheme for QoS evaluation of multi-path transmission in overlapped networks: the current path QoS measurements are aimed at end-to-end or a certain link. It can not be applied to the multipath transmission path with relay node. Although the traditional predictive estimation method can make up for the lag of measurement, the multiple sampling to ensure non-distortion recovery will add a lot of additional burden to the network. At present, it is mainly based on the transport layer protocol or ICMP protocol as the QoS evaluation for real-time transmission media path, through statistical analysis of delay, bandwidth, packet loss rate and other content to evaluate. Unable to accommodate message passing between multipath transport relay nodes. Based on the multi-path transmission scenario of application relay, this paper focuses on the following aspects: 1) organizational management of overlapped network relay nodes and 2) QoS measurement and prediction mechanism and protocols between relay nodes; 3) end-to-end transmission path QoS evaluation protocol. The main research contents and results of this paper are as follows: 1. The overlapping network paths and relay nodes are classified and described respectively, and then the concept of transmission path selection is quantificationally represented. This paper provides a basis for path management and path QoS evaluation for multi-path transmission in overlapping networks. On the basis of summing up the traditional path QoS evaluation parameters and their measurement methods, it is determined that the time delay and available bandwidth are used as the evaluation parameters to characterize the path QoS in this paper. By extending the existing measurement methods, this paper designs a relay node path QoS measurement mechanism based on relay controller and its interactive message format 3) to make up for the deficiency of active measurement methods, through in-depth analysis of the traditional predictive estimation algorithm. A path QoS prediction module based on compression sensing theory is designed, and the corresponding prediction estimation flow is given. By extending the RTCP protocol, the multipath receiving end report and the multipath senders report are presented. It is a new grouping type with path ID and other parameter information, and the corresponding interaction mechanism is given to realize the QoS evaluation of end-to-end path. Finally, the simulation test based on OMNeT platform verifies the universality and accuracy of the proposed solution, and can be applied to the evaluation of QoS based on application relay multipath transmission path for overlapped networks.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.07

【相似文献】