With the development of Internet of Things (IoT), the number of mobile terminal devices is increasing rapidly. Because of\nhigh transmission delay and limited bandwidth, in this paper, we propose a novel three-layer network architecture model which\ncombines cloud computing and edge computing (abbreviated as CENAM). In edge computing layer, we propose a computational\nscheme of mutual cooperation between the edge devices and use the Kruskal algorithm to compute the minimum spanning\ntree of weighted undirected graph consisting of edge nodes, so as to reduce the communication delay between them. Then we\ndivide and assign the tasks based on the constrained optimization problem and solve the computation delay of edge nodes by\nusing the Lagrange multiplier method. In cloud computing layer, we focus on the balanced transmission method to solve the\ndata transmission delay from edge devices to cloud servers and obtain an optimal allocation matrix, which reduces the data\ncommunication delay. Finally, according to the characteristics of cloud servers, we solve the computation delay of cloud computing\nlayer. Simulation shows that the CENAMhas better performance in data processing delay than traditional cloud computing.
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