移动云计算环境下即时通讯框架的研究与实现

发布时间：2018-07-07 18:11

本文选题：移动云计算 + 数据格式　；参考：《中国地质大学（北京）》2014年硕士论文

【摘要】：随着云计算技术和移动互联网技术的快速发展，云端和移动端相结合而形成的移动云计算模式将深刻改变人们的生活方式。当今移动网络的快速发展也使得人们对通信服务的类型要求越来越丰富和质量要求越来越高。人们希望不管是在公司、家中、酒店还是在路上，都可以轻松而高效地处理日常事务、办理工作业务和协作通信等等，这就要求移动通信可以提供稳定的、实时的通信环境。但是由于移动终端的处理能力、续航能力和存储容量都有限，尤其当移动终端设备通过无线网络接入互联网进行大数据量传输的时候，会产生一个非常大的电量消耗。因此，在保证通信稳定性和及时性的前提下，提高移动通信设备在通讯过程中的能效，是一个迫切需要解决的问题。本文将比较成熟的云计算技术和当下正蓬勃发展的移动互联网相结合，研究如何充分利用两者各自的优势，为移动设备提供一个高效、便捷、稳定的通讯环境。本文通过深入研究云计算的特性和移动终端设备连接云端的方式，提出了一个优化的移动云计算环境下即时通讯的框架。围绕该框架，我们从数据传输格式优化技术以及如何利用Markov模型改进网络切换策略等方面进行深入研究。首先，介绍框架云端和移动客户端的设计；云端分为多个层次，主要有数据缓存层、数据存储层和网络切换预测引擎；移动客户端则根据功能分为多个模块，主要有通信、数据转换、网络管理和UI交互等四个模块。然后，介绍了上述各层次和模块的具体实现细节；在数据转换的实现中，采用了一种解析速度更快、数据体积量更小的数据格式Protobuf取代现有的XML或JSON格式；网络切换预测引擎的实现过程则引入了二阶Markov模型，，为用户提供网络切换策略，使用户知道在何地更应该使用何网络，从而达到节省移动端的电量、流量消耗的目的。最后，根据移动云计算环境下即时通讯框架实现的原型系统，通过应用实例的测试，给出使用框架后进行数据传输的能耗情况，验证框架的节能优势。
[Abstract]:With the rapid development of cloud computing technology and mobile Internet technology, the mobile cloud computing model formed by the combination of cloud and mobile terminal will profoundly change people's way of life. Nowadays, with the rapid development of mobile network, people demand more and more types of communication services and higher quality requirements. People hope that whether in the company, home, hotel or on the road, they can easily and efficiently handle daily affairs, work business and cooperative communication, etc., which require mobile communication to provide a stable, real-time communication environment. However, due to the processing capacity of the mobile terminal, the capacity and storage capacity of the mobile terminal are limited, especially when the mobile terminal equipment is connected to the Internet through the wireless network for large amount of data transmission, it will produce a very large consumption of electricity. Therefore, on the premise of ensuring the stability and timeliness of communication, it is an urgent problem to improve the energy efficiency of mobile communication equipment in the communication process. This paper combines the mature cloud computing technology with the booming mobile Internet, and studies how to make full use of their respective advantages to provide an efficient, convenient and stable communication environment for mobile devices. By studying the characteristics of cloud computing and the way that mobile terminal devices connect to the cloud, this paper proposes an optimized framework for instant communication in mobile cloud computing environment. Around this framework, we study the data transmission format optimization technology and how to improve the network handoff strategy using Markov model. First of all, the design of the framework cloud and mobile client is introduced. The cloud is divided into several levels, including data buffer layer, data storage layer and network switch prediction engine, and mobile client is divided into several modules according to its functions. Data conversion, network management and UI interaction are four modules. Then, the implementation details of the above layers and modules are introduced. In the implementation of data conversion, a new data format, Protobuf, which is faster in parsing speed and smaller in volume, is used to replace the existing XML or JSON format. The second order Markov model is introduced in the implementation of the network handoff prediction engine, which provides users with a network handover strategy and enables users to know where and where they should use the network so as to save the power consumption and traffic consumption of the mobile terminal. Finally, according to the prototype system of instant communication framework in mobile cloud computing environment, through the test of application examples, the energy consumption of data transmission after using the framework is given, and the advantages of energy saving of the framework are verified.
【学位授予单位】：中国地质大学（北京）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP311.52;TN929.5

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