软终端的多连接流量控制功能的设计与实现

发布时间：2018-04-17 16:58

本文选题：流量控制 + 多连接　；参考：《北京邮电大学》2014年硕士论文

【摘要】：随着网络技术的发展,一方面越来越多的终端设备(如智能手机、平板电脑、笔记本电脑等).可以同时支持2G、3G和Wi-Fi等多种接入网络；’另一方面伴随着互联网多媒体网络应用的急剧增长,现有网络资源已经无法满足用户对网络带宽的需求。为了提高网络传输数据的效率,充分利用现有网络资源,在通信终端之间实现并发多连接传输已经成为近年来研究人员关注的热点。通过利用通信终端的多网络接口实现多连接技术已经被证明是解决网络带宽不足的有效途径,达到提高网络吞吐量和传输效率的目的。本文即着手基于多连接技术的流量传输控制功能的设计和实现。在现有的并发多连接技术中,大多数的改进或者实现是基于传输层协议,同时关键技术在于多个连接上实现负载均衡以及单个连接上实现拥塞控制,其中以基于SCTP协议和TCP协议实现的并发多连接传输为主。但是基于SCTP和TCP协议的对数据包丢包重传的可靠性传输要求其实并不适合音视频这种实时流媒体传输场景下。一方面,实时流媒体的特点是：数据是动态变化的,事先无法预知大小；实时性强,对传输延迟抖动要求较高；数据量大,对网络吞吐量有较高要求；在不影响体验质量的前提下可少量丢包；另一方面,也没有把各个连接的不同属性以及随时间动态变化的特性考虑在内。本文的目的是设计并实现流媒体应用环境下的并发多连接传输技术。本论文是在SCTP、RTCP、UDP协议的基础上研究并发多连接传输机制,‘并考虑到流媒体数据的特点以及各个连接的QoS的动态变化特性,提出了一种多连接实时流媒体传输控制框架,实现多QoS质量评估、流量调度分配、拥塞控制的功能,最大限度地聚合多个网络的有效带宽,动态实时地调整各连接的传送量,提高各连接的有效带宽利用率。为了验证有效性,本文利用NS2仿真工具对修改的协议进行仿真,对比分析在吞吐量、延时等性能指标下多连接与单连接的不同与差异。最后对本文进行了总结并提出论文工作中有待改进之处。
[Abstract]:With the development of network technology, more and more terminal devices (such as smart phone, tablet computer, notebook computer, etc.)It can support many kinds of access networks such as 2GN 3G and Wi-Fi. On the other hand, with the rapid growth of Internet multimedia network applications, the existing network resources can no longer meet the needs of users for network bandwidth.In order to improve the efficiency of network data transmission and make full use of existing network resources, the realization of concurrent multi-connection transmission between communication terminals has become a hot topic for researchers in recent years.It has been proved that using multi-network interface of communication terminal to realize multi-connection is an effective way to solve the shortage of network bandwidth and to improve network throughput and transmission efficiency.In this paper, the design and implementation of flow transmission control based on multi-connection technology is introduced.Among the existing concurrent multi-connection technologies, most of the improvements or implementations are based on transport layer protocols, while the key technologies are load balancing on multiple connections and congestion control on single connections.Among them, the concurrent multi-connection transmission based on SCTP protocol and TCP protocol is the main one.However, the reliable transmission requirements of packet loss and retransmission based on SCTP and TCP protocols are not suitable for audio and video real-time streaming media transmission scenarios.On the one hand, the characteristics of real-time streaming media are as follows: the data is dynamic and unpredictable in advance; the real time is strong, the requirement of delay jitter is high; the amount of data is large, and the network throughput is high.On the other hand, the different properties of each connection and the characteristics of dynamic changes over time are not taken into account.The purpose of this paper is to design and implement concurrent multi-connection transmission technology in streaming media application environment.In this paper, based on the SCTP / RTCPU UDP protocol, a control framework for multi-connection real-time streaming media transmission is proposed, considering the characteristics of streaming media data and the dynamic characteristics of QoS.The functions of multi- quality evaluation, traffic scheduling and allocation, congestion control, aggregation of the effective bandwidth of multiple networks to the maximum extent, dynamic real-time adjustment of the amount of transmission of each connection, improve the effective bandwidth utilization of each connection.In order to verify the validity, the modified protocol is simulated with NS2 simulation tool, and the differences and differences between multi-connection and single-connection under throughput, delay and other performance indicators are compared and analyzed.Finally, this paper is summarized and the work of the paper needs to be improved.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.06

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