面向业务体验质量的多径中继传输控制方法研究

发布时间：2018-11-03 21:23

【摘要】：重叠网络中的多径传输有助于克服带宽瓶颈,并且通过路径冗余来提升用户体验质量,是网络传输技术的一个重要发展方向。在面向业务体验质量的多径传输方面,总体上还处于技术研发的初级阶段,特别在相关传输控制机制方面,还没有可用的方案。本文主要研究多径重叠网络中面向业务体验质量的传输控制机制,在应用层实现数据传输转发处理是一种典型的重叠网络技术,基于重叠网络实现多径传输,实际上降低了多径传输应用的技术门槛。建立多路径传输条件只是实现多径传输的基础,多径传输的性能和效率更多依赖于多径传输控制机制和协议,特别是对于面向业务体验质量的多径传输,需要综合考虑业务传输需求和路径QoS条件的动态变化等多种要素,同时依然要保留传输分组之间的时间序列关系。传输控制机制需要平衡传输效率和可靠性的关系,以满足用户的业务体验质量(QoE)为基本目标。本文总结分析了现有的多径传输协议,结合重叠网络中继路径特征和媒体业务实时传输的需求,深入研究了相关的多径传输控制机制和子流重组办法。主要工作和成果是：1)提出基于权值计算多径传输控制机制,设计了两种多径负载分配算法,根据数据业务特征与路径状态,对每条路径传输能力进行综合评价,根据QoE最优预测结果确定各条路径的权值,根据权值分配负载。2)设计了基于服务质量反馈的多径传输控制机制,在发送端设置令牌桶,负载根据令牌桶中指令选择相应的路径进行传送,在接收端设置反馈“应答消息”,发送端通过接收“应答消息”来判断各条路径的当前状况,从而决定下一步的路径令牌指令的设定。在此基础上还提出将两种机制进行有效的结合,即在基于服务质量反馈的多径传输控制机制中加入负载分配算法,同时根据接收端对各条路径的传输状态反馈,动态调整负载分配策略。3)提出了一种基于动态缓冲的子流重组机制,设计了相应的重组办法。在接收端设置缓冲区,将各条子流传输的数据包进行排序后,再传递给数据处理器,从而减弱时延抖动的影响。根据丢包率和时延等参数,动态调整缓冲区的大小。最后通过网络仿真实验,验证了本文提出的面向业务体验质量的多径传输控制机制具有合理性,其中的负载分配算法具有可行性,能够实现数据业务的多径传输控制。
[Abstract]:Multi-path transmission in overlapping networks helps overcome bandwidth bottlenecks and improves user experience quality through path redundancy, which is an important development direction of network transmission technology. In the aspect of service experience quality oriented multipath transmission, it is still in the initial stage of technology research and development, especially in the related transmission control mechanism, there is no available scheme. In this paper, the transmission control mechanism oriented to service experience quality in multipath overlap network is mainly studied. It is a typical overlapping network technology to realize data transmission and forward processing in application layer, which is based on overlapping network to realize multipath transmission. In fact, it reduces the technical threshold for multipath transmission applications. The establishment of multipath transmission conditions is only the basis of multipath transmission. The performance and efficiency of multipath transmission depend more on multipath transmission control mechanisms and protocols, especially for service experience quality oriented multipath transmission. It is necessary to consider various factors such as traffic requirements and dynamic changes of path QoS conditions, while maintaining the time series relationship between transport packets. The transmission control mechanism needs to balance the relationship between transmission efficiency and reliability, and the basic goal is to meet the user's service experience quality (QoE). In this paper, the existing multipath transmission protocols are summarized and analyzed. Combined with the characteristics of relay paths in overlapping networks and the requirements of real-time media traffic, the related multipath transmission control mechanisms and sub-stream reconfiguration methods are studied in depth. The main work and achievements are as follows: 1) the multipath transmission control mechanism based on weight calculation is proposed, and two multipath load allocation algorithms are designed. According to the characteristics of data traffic and path state, the transmission capacity of each path is evaluated synthetically. According to the optimal prediction result of QoE, the weight of each path is determined, and the load is distributed according to the weight. 2) the multipath transmission control mechanism based on QoS feedback is designed, and the token bucket is set at the sending end. The load selects the corresponding path according to the instruction in the token bucket for transmission, sets feedback "reply message" at the receiving end, and the sending side judges the current status of each path by receiving the "reply message". This determines the next path token instruction setting. On the basis of this, it is also proposed to combine the two mechanisms effectively, that is, to add a load allocation algorithm to the multipath transmission control mechanism based on QoS feedback, and at the same time, according to the transmission state feedback of each path at the receiving end. Dynamic adjustment of load allocation strategy. 3) A dynamic buffer based substream recombination mechanism is proposed, and the corresponding recombination method is designed. The buffer is set at the receiving end, the packets transmitted by each sub-stream are sorted, and then transferred to the data processor, so as to reduce the effect of delay jitter. The buffer size is dynamically adjusted according to the parameters such as packet loss rate and delay. Finally, through network simulation experiments, it is verified that the proposed multi-path transmission control mechanism for service experience quality is reasonable, and the load allocation algorithm is feasible and can realize the multi-path transmission control of data services.
【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】：TN919.3

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