移動云服務架構設計與計算卸載策略研究
[Abstract]:With the rapid development of the Internet and the explosive growth of mobile applications based on "cloud", the data flow increases sharply. Mobile communication networks need to seek new development direction to meet higher service demand, but no matter how the future network evolves, The features of the cloud are essential. The combination of cloud computing and mobile communication network will facilitate the formation of communication, computing, storage "trinity" network form, using the communication network to carry computing tasks, using computing technology to solve communication problems. Therefore, a new cloud service network architecture which combines computing and communication needs to be proposed and has profound significance. Computing uninstall is the basic principle and main service delivery mode of mobile cloud computing, which is helpful for users to break through the limitation of physical resources, and to realize complex cloud services and better user experience. The main characteristics of computing and uninstalling are interactivity and permutation. In the process of information exchange between user and cloud, the powerful storage / computing resources of cloud are replaced by consuming part of communication energy and bandwidth resources. Time cost, energy consumption cost and other factors should be taken into account in the calculation of uninstall. Therefore, a reasonable calculation and unloading strategy is proposed to minimize the cost of users and optimize the utilization of the network. Aiming at the above two problems, this paper first reconstructs and innovates the overall network architecture that supports mobile cloud services, and then synthetically considers task information, cloud information and communication network information. A multi-site opportunity computing uninstall strategy for this architecture is proposed. The main research work and innovation are as follows: (1) based on the integration of computing and communication, this paper designs a hierarchical distributed mobile cloud service architecture, which is based on the traditional core cloud services and integrates into the emerging edge cloud services. And innovative device cloud services. The edge cloud is used to bring the cloud service closer to the access side to reduce the communication delay and relieve the backbone link pressure. The device cloud is used to further integrate the cloud service into the client to realize the cooperative computing of the terminal. At the same time, this paper also designs a collaborative control cloud service system based on Software-Defined networking (SDN) technology, which can effectively alleviate the management problems caused by distributed cloud resources. (2) the cloud service architecture based on hierarchical distributed deployment. In this paper, the delivery process of multi-site computing unload service based on SDN local cooperative controller is studied, and the opportunistic computing characteristics of computing uninstall service in mobile environment are analyzed. A model for computing the effective connectivity probability of "terminal-cloud" in mobile environment is presented. Finally, the proposed model is simulated and verified by Matlab, which proves the validity of the model. (3) based on the multi-site opportunity to calculate the unloading service flow, this paper comprehensively considers computing task information, cloud information and network channel information. A multi-site calculation and uninstall strategy is designed. In this paper, the task state is defined by computation and transmission, cloud state is measured by effective connectivity probability, and wireless channel state is fitted by Gilbert-Elliott (GE) channel model to minimize system cost (including time cost). Energy consumption and penalty cost) as the goal, the computational unload problem is transformed into an optimization problem, a mathematical model based on constrained Markov decision is established, and a backward iterative algorithm with Q learning is used to solve the optimal strategy for calculating unload. Finally, compared with other three strategies through Matlab simulation, the results show that the superiority of the algorithm can effectively reduce the cost of users.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN929.5;TP393.09
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