Distributed collaborative caching method based on MEC-D2D

Abstract

A distributed cooperative caching method based on MEC-D2D belongs to the wireless communication technology, and comprises the following steps: firstly, analyzing the influence of factors such as content popularity in a cooperative communication model, finiteness of a caching space C, D2D communication layer interference and the like on the average time delay of user content acquisition; constructing a joint content caching mechanism between the edge server and the terminal into a time delay optimization problem; establishing a content segmentation model, and adopting a cache placement strategyfor content deployment, so a user can obtain the total number Kcf of content fragments from an adjacent terminal through a D2D link, and when cached fragments in adjacent equipment are not enough toreconstruct content f, the number of [sf-min (Kcf, sf)] content fragments needs to be obtained from an MEC server so as to guarantee content integrity; converting an optimization target for reducing user content acquisition average time delay into a complete knapsack problem, dividing the optimization target into a plurality of different sub-problems, solving each sub-problem by adopting a dynamicprogramming algorithm, and searching an optimal cache allocation scheme {cf}* forming an optimal solution.

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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