Cooperative coding caching method in D2D network based on dynamic request

Abstract

The invention discloses a cooperative coding caching method based on a dynamic request D2D network. The cooperative coding caching method comprises the following steps: 1, establishing a network architecture; 2, establishing a user content sharing model in the D2D network; 3, processing the content in the network through a maximum distance separable (MDS) code ; 4, obtaining a content packet by a user ; 5, calculating the content transmission delay of the transmission process from the base station to the user in the D2D transmission process; 6, analyzing the dynamic request of the user; 7, establishing a coding cache problem in the D2D network as a Markov decision process (MDP); 8, calculating the average value of the cache rewards; 9, establishing an optimization problem by taking an average value of maximizing the total time cache rewards as an optimization target; and 10, proposing a cooperative coding cache algorithm based on Q-learning to carry out solution. According to the method, the cache redundancy is reduced, and the traffic load pressure of the base station is relieved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a dynamic request-based collaborative encoding and caching method in a D2D network. Background technique [0002] With the development of wireless network technology and the popularization of cloud applications, content diversity and mobile data traffic are exploding. Mobile data traffic is currently growing at an exponential rate. This rapid growth has led to a heavier burden on the backhaul link and reduced the quality of service (Quality of service, QoS) of users in the mobile cellular network. In order to solve this problem, caching technology has caused extreme Big attention because it can effectively reduce backhaul traffic by eliminating multiple duplicate data transmissions for popular content. The core idea of ​​caching technology is to place content in different locations to avoid communication link congestion caused by simultaneous requests ...

AI Technical Summary

Problems solved by technology

[0005] However, there are still some deficiencies in the research on caching in D2D networks. Users in D2D networks lack effective collaboration methods, and there are few studies on how to formulate coding caching strategies under the condition of dynamic changes in user request status. The cache efficiency of the medium user equipment is reduced, and a large amount of cache redundancy is generated at the same time, and the cache capacity of the user equipment is wasted.

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