A network-wide collaborative content cache management system and method based on sd-ran

Abstract

The invention discloses a system and method for network-wide collaborative cache management based on a software-defined access network SD-RAN, which generates a content-popularity mapping table and a waiting cache / replacement list by detecting and counting content popularity, and according to the waiting cache The / replacement list makes a cache decision and sends it to the cache node for cache update; the real-time global cache mapping table is obtained by monitoring the cache decision; and then according to the content request of the user in the community, the cache node responds and delivers the corresponding content. The system and method proposed by the present invention comprehensively take into account the user’s limitation on content acquisition time delay and the characteristics that the popularity of different content changes with time and region, fully utilize the global network view in the control layer of software-defined network, and expand the content The popularity detection range optimizes content placement through network-wide collaborative caching, thereby effectively avoiding repeated retrieval of content from remote content servers, reducing network overhead and improving user experience.

Description

technical field [0001] The present invention belongs to the technical field of wireless communication, and more specifically relates to a network-wide collaborative content cache management system (Caching Management System, CMS) and method based on a Software Defined-Radio Access Network (SD-RAN) . Background technique [0002] Cache is a content storage technology. Based on this technology, it can effectively alleviate the capacity bottleneck of the backhaul network and avoid the problem of the same content being repeatedly called and transmitted from the remote server. In view of this, caching technology is considered to be a key technology that can significantly improve resource utilization and reduce network delay. [0003] Caching technology is to store popular content in the cache server and deploy it on the edge of the network near the user, so that the user can obtain the required information in a more flexible and efficient manner. Considering that the cache serv...

AI Technical Summary

Problems solved by technology

On the one hand, this kind of distributed cooperation between adjacent nodes has high complexity and long delay, which is difficult to realize in the actual system

On the other hand, since the cache nodes only cache content according to the local network state, it is impossible to obtain the globally optimal cache decision.

Images