With the explosion of the video content industry, the demand for large file downloads is increasing rapidly. Different from text-based contents, video contents require lossless transmission with an ordered constraint to ensure the best utility. Meanwhile, providing low latency and stable downloads under high mobility scenarios, such as vehicle users in a highway, is one of the major challenges in wireless communications. In this work, a caching strategy is adopted to address the problem of downloading large order-sensitive contents, supporting user mobility. Particularly, a multi-layer caching framework is proposed based on a simple yet efficient adaptive chunk-based caching (ACBC) algorithm. The multi-layer caching framework increases the flexibility in deploying file chunks and shortens the distance between user and content with affordable memory cost, while ACBC algorithm introduces a feedback mechanism to provide stable and high-efficiency chunk deployment scheme. The cooperation of the two ensures reliable downloads for high-mobility users with minimal access delay and caching space requirements. Simulation results indicate that our solution achieves a very small content access delay with a low cache space occupation compared with other mobility-based caching algorithms (such as MAP and RICH). 1
A Popularity- and Mobility-Aware Multi-layer Caching with Feedback Mechanism for Highway Vehicular Networks
2020-11-01
2041811 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
IEEE | 2023
|