关键词: 内容异构, 5G无线网络, 云对边, 混合缓存, 服务延迟

Abstract: Most existing content caching algorithms require accurate estimation of content popularity, which is difficult to implement in a dynamic mobile network environment. This paper proposes a cloud-to-side hybrid caching strategy for content heterogeneous 5G wireless networks, and designs and optimizes the content caching location, which can be the original content server, Cloud Unit（CUs） and Base Station（BSs）. Firstly, Lyapunov optimization method is used to solve the tight coupling problem between NP-hard cache control and CU cache and BS cache control decision. It is helpful to improve and identify the hierarchy of network architecture and the membership relationship between Cus cache and BSs cache. Cloud-centric and edge-centric caching improves content caching performance and supports high average request content data rates. Secondly, the Lyapunov optimization technique is used to realize the limited service latency of all arrival rates in the constant fraction capacity area, and then the fast reading of the cached data is realized. Simulation results show that the proposed cache strategy has significant advantages in terms of average end-to-end service delay and load reduction rate.

Key words: content heterogeneity, 5G wireless network, cloud to side, hybrid cache, service latency