# An Active Path-Associated Cache Scheme for Mobile Scenes
###### Abstract  
With the widespread growth of mass content, information-centric networks (ICN) have become one of the research hotspots of future network architecture. One of the important features of ICN is ubiquitous in-network caching. In recent years, the explosive growth of mobile devices has brought content dynamics, which poses a new challenge to the original ICN caching mechanism. This paper focuses on the WiFi mobile scenario of ICN. We design a new path-associated active caching scheme to shorten the time delay of users obtaining content to enhance the user experience. In this article, based on the WiFi scenario, we first propose a solution for neighbor access point selection from a theoretical perspective, considering the caching cost and transition probability. The cache content is then forwarded based on the selected neighbor set. For cached content, we propose content freshness according to mobile characteristics and consider content popularity at the same time. For cache nodes, we focus on the size of the remaining cache space and the number of hops from the cache to the user. We have implemented this strategy based on the value of caching on the forwarding path. The simulation results show that our caching strategy has a significant improvement in performance compared with active caching and other caching strategies. ICN; proactive caching; mobility; caching strategy Article  
An Active Path-Associated Cache Scheme for Mobile Scenes  
[PERSON], [PERSON]. At present, academia generally pays attention to the user-side mobile, that is, the mobile scene in which the user side moves and the opposite end remains stationary. The research on user mobility caching methods can be roughly divided into the following four types [8]:  
* Reactive: the old path node continues to cache the content requested by the user until the user accesses the new connection point, and the new connection point requests the previously cached content. * Persistent subscription: cache the items subscribed by mobile users through an intermediate agent. * Active: the content is cached to the new access point in advance, and the content is directly obtained when the user connects to the new access point. * Enable: dynamically adjust the cache policy to improve the hit rate of the local cache. Through the investigation and analysis of relevant literature, the first method introduces a large time delay, while the second method causes an unnecessary waste of space. Combining the advantages of the third proactive type and the fourth heuristic type, this paper proposes a set of collaborative caching mechanisms based on neighbor message propagation for the user-side mobile WiFi scenario. For cached destination access point (AP) selection, this mechanism can select a set of destination APs according to the transition probability table of the source AP and the set transition threshold after the terminal device moves. In addition, after the terminal device accesses the destination AP, the destination AP will reply with a message to update the transition probability table of the source AP. For the selection of cache nodes, this article is different from other proactive caching strategies that send content directly to the destination AP. We dynamically pull the content in advance to the forwarding path from the source AP to the destination AP through a collaborative caching algorithm based on the freshness and popularity of the content to reduce network delay and improve user experience. The main contributions of this article are as follows:  
* We propose a caching mechanism for neighbor message propagation based on user behavior. This mechanism selects the target AP set according to the transition probability table and the transition threshold of the source AP and triggers active caching when the user moves.