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2022 | OriginalPaper | Chapter

3. Delay-Minimized Mobile Edge Caching in the Terrestrial HetVNet

Authors : Huaqing Wu, Feng Lyu, Xuemin Shen

Published in: Mobile Edge Caching in Heterogeneous Vehicular Networks

Publisher: Springer International Publishing

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Abstract

The caching-assisted heterogeneous vehicular networks (HetVNets) are envisioned as a promising solution to support the ever-increasing vehicular applications. In this chapter, we investigate content caching in terrestrial HetVNets where Wi-Fi roadside units (RSUs), TV white space (TVWS) stations, and cellular base stations (CBSs) are considered to cache content files. To characterize the intermittent Wi-Fi and TVWS network connections, we establish an on–off model with service interruptions to describe the vehicular content delivery process. Content coding is then leveraged to resist the impact of unstable network connections with optimized coding parameters. By jointly considering the impact of file profiles and network characteristics, we investigate the content placement in heterogeneous APs to minimize the average content delivery delay, which is formulated as an integer linear programming problem. Adopting the idea of the student admission model, the formulated problem is then transformed into a many-to-one matching problem and solved by our proposed stable matching-based caching scheme. Simulation results demonstrate that the proposed scheme can achieve near-optimal performances in terms of delivery delay and offloading ratio with low complexity.

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previous chapter Techniques for Content Delivery Performance Enhancement
next chapter Optimal UAV Caching and Trajectory Design in the AGVN
Footnotes
1
In addition to Wi-Fi- and TVWS-based access technologies, there exist many other techniques [11]. Although only Wi-Fi, TVWS, and cellular networks are considered in this chapter, our methodology and the proposed scheme are applicable to HetVNets scenarios with more access techniques.
 
2
File popularity information can be obtained based on historical requests and predicted as studied in many existing works (e.g., [12]). Popularity prediction is beyond the scope of this chapter.
 
3
Since overall content delivery delay is significantly affected by file size, average delay per unit data (sec/bit), which is the ratio of the overall delay defined in (3.3) over the total requested file size, is adopted in the simulation to represent the content delivery delay performance.
 
4
All the APs are assumed to have the same storage capacity, and the caching storage ratio is the ratio of the storage capacity of one AP over the total size of all the content files.
 
5
The cache hit rate is defined as the ratio of the number of cache hit in all the APs’ caches to the overall number of vehicular content requests.
 
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Metadata
Title
Delay-Minimized Mobile Edge Caching in the Terrestrial HetVNet
Authors
Huaqing Wu
Feng Lyu
Xuemin Shen
Copyright Year
2022
Book
Mobile Edge Caching in Heterogeneous Vehicular Networks

Print ISBN: 978-3-030-88877-0

Electronic ISBN: 978-3-030-88878-7

Copyright Year: 2022

DOI
https://doi.org/10.1007/978-3-030-88878-7_3