Two-layer distributed content caching for infotainment applications in VANETs

Xue, Z., Liu, Y., Han, G., Ayaz, F. , Sheng, Z. and Wang, Y. (2022) Two-layer distributed content caching for infotainment applications in VANETs. IEEE Internet of Things Journal, 9(3), pp. 1696-1711. (doi: 10.1109/JIOT.2021.3089280)

Abstract

For vehicular ad-hoc networks (VANETs), edge caching has attracted considerable research attention to maximize the efficiency and reliability of infotainment applications. In this paper, we propose a two-layer distributed content caching scheme for VANETs by jointly exploiting the cache at both vehicles and roadside units (RSUs). Specifically, we formulate content caching problem to minimize the overall transmission delay and cost as a nonlinear integer programming (NLIP) problem and propose an alternate dynamic programming search (ADPS) based algorithm to solve it. In ADPS, we divide the original problem into three sub-problems, then we use the dynamic programming (DP) method to solve each sub-problem separately. To reduce the complexity, we further propose a cooperation-based greedy (CBG) algorithm to solve the large scale original problem. Both numerical simulation results and experiments in testbed show that the proposed caching scheme outperforms existed caching schemes, the transmission delay and cost can be reduced by 10% and 24% respectively, while the hit ratio can be increased by 30% in a practical environment, as compared to popularity-based caching scheme.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ayaz, Ms Ferheen
• Authors: Xue, Z., Liu, Y., Han, G., Ayaz, F., Sheng, Z., and Wang, Y.
• College/School: College of Science and Engineering > School of Computing Science
• Journal Name: IEEE Internet of Things Journal
• Publisher: IEEE
• ISSN: 2372-2541
• ISSN (Online): 2327-4662
• Published Online: 14 June 2021