A Distributed Cooperative Caching Method Based on mec-d2d

Abstract

A distributed collaborative caching method based on MEC‑D2D, which belongs to wireless communication technology. Firstly, it analyzes the effects of factors such as content popularity in the collaborative communication model, the limitation of cache space C, and D2D communication layer interference on the average delay of user content acquisition. Influence, the joint content caching mechanism between the edge server and the terminal is constructed as a delay optimization problem; secondly, the content segmentation model is established, and the cache placement strategy is used for content deployment, and the user can obtain the total Kc from the adjacent terminal through the D2D link f content fragments, when the cached fragments in the neighboring device are not enough to reconstruct the content f, it needs to be obtained from the MEC server [s f ‑min(Kc f ,s f )] content fragments to ensure the integrity of the content, the optimization goal of reducing the average delay of user content acquisition is transformed into a complete knapsack problem, the optimization goal is divided into several different sub-problems, and each sub-problem is dynamically The planning algorithm is used to solve the problem and find the optimal cache allocation scheme {c f} * .

Description

technical field [0001] The invention relates to wireless communication technology. Background technique [0002] In the era of the Internet of Everything, the rapid development of mobile communication has led to the emergence of a variety of new terminals, and the network traffic generated by massive terminals has exploded. The traditional method of obtaining data from the core network has caused an increasing probability of network congestion. The ever-increasing requirements for network service quality will not be able to meet the needs of delay-sensitive and differentiated performance applications such as AR / VR. In order to solve the above problems, it is the general trend for edge distributed collaborative cache to become a supporting platform for emerging Internet of Everything applications. [0003] Edge caching is a new low-latency content distribution method in future mobile communication networks. Content providers cache popular content fragments on edge clouds or t...

AI Technical Summary

Problems solved by technology

Both edge servers and terminal devices can deploy cache resources. In the current public research, most of the edge caches and terminal caches are considered separately. In this way, although the optimization of intra-layer cache redundancy is realized at different edge layers or user layers, But this does not guarantee the efficient utilization of cache space in the entire network system

On the other hand, the current research mostly deploys a single file as a whole in a base station or a terminal. When the content of a single file is large and the end user is in a mobile state, the user terminal can only cache a small number of files, and the communication between the user and the base station Insufficient time will lead to a higher probability of content transmission failure, and the advantages of distributed caching cannot be fully reflected

[0004] In the patent of the collaborative caching solution based on the MEC and D2D cooperation mode, the modeling of the traditional method is too idealized and does not consider more communication obstacles in real communication scenarios, such as effective communication radius, interference, etc., so the application range is narrow and expandable Low

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