Scalable Video Caching for Information Centric Wireless Networks

Zhilong Zhang,Minyin Zeng,Shiwen Mao,Danpu Liu,Jianmei Dai

doi:10.1109/access.2020.2989532

Abstract

Recently, information centric wireless network (ICWN) has been concerned due to its flexible network structure and high efficiency of content delivery. Meanwhile, scalable video coding (SVC) is a promising solution to provide high quality of video services. Combining ICWN and SVC is expected to improve the performance of wireless video delivery services. Since caching strategy plays a significant role in ICWN, in this paper, we address the caching problem for scalable videos over ICWN in mobile scenarios. By jointly considering the layered structure of SVC and the hierarchical architecture of ICWN, we formulate an optimization problem to minimize the average download delay. A novel layered hierarchical caching method is proposed for solving the problem. Furthermore, we focus on a special but common case in which the above delay minimization problem is equivalently transformed into a cache hit ratio maximization problem. A simplified algorithm with 1/2 approximation ratio is provided. Finally, simulation results show that our proposed caching schemes outperform baseline methods in cache hit rate and delay performance.

Highlights

With the development of wireless communication technologies and the proliferation of smart devices, we have witnessed the explosive increment of mobile traffic
We address the problem of scalable video caching over Information centric wireless networks (ICWN), and aim to minimize the average transmission delay
In this paper, we address the caching problem for scalable video coding (SVC)-based video steaming over ICWN, which is characterized by both layered video contents and hierarchical network structures

Summary

Introduction

With the development of wireless communication technologies and the proliferation of smart devices, we have witnessed the explosive increment of mobile traffic. According to [1], the total amount of mobile traffic is predicted to reach 136 exabytes (EB) per month by the end of 2024, and over 74% of the traffic will be contributed by videos. To effectively cope with such a traffic growth, network operators aim at expanding the network capacity, and changing the network structure to prevent unnecessary traffic forwarding and large delays. Information centric wireless networks (ICWN) is regarded as a promising technology to achieve the aforementioned goals. Different from the content delivery network (CDN) which caches contents in the application layer outside the access networks, ICWN provides in-network caching capabilities nearby mobile users, and reduces the average download delay when the requested contents are locally cached.

Objectives

Results

Conclusion