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Tradeoff Caching Strategy of Outage Probability and Fronthaul Usage in Cloud-RAN

Ye, Zhun, Pan, Cunhua, Zhu, Huiling, Wang, Jiangzhou (2018) Tradeoff Caching Strategy of Outage Probability and Fronthaul Usage in Cloud-RAN. IEEE Transactions on Vehicular Technology, 67 (7). ISSN 0018-9545. (doi:10.1109/TVT.2018.2797957)

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http://dx.doi.org/10.1109/TVT.2018.2797957

Abstract

In this paper, tradeoff content caching strategy is proposed to jointly minimize the cell average outage probability and fronthaul usage in cloud radio access network (Cloud-RAN). At first, an accurate closed form expression of the outage probability conditioned on the user’s location is presented, and the cell average outage probability is obtained through the composite Simpson’s integration. The caching strategy for jointly optimizing the cell average outage probability and fronthaul usage is then formulated as a weighted sum minimization problem, which is a nonlinear 0-1 integer problem. Two heuristic algorithms are proposed to solve the problem. Firstly, a genetic algorithm (GA) based approach is proposed. Numerical results show that the performance of the proposed GA-based approach with significantly reduced computational complexity is close to the optimal performance achieved by exhaustive search based caching strategy, and the GA-based approach can improve the performance by up to 47.5% on average than the typical probabilistic caching strategy. Secondly, in order to further reduce the computational complexity, a mode selection approach is proposed. Numerical results show that this approach can achieve near-optimal performance over a wide range of the weighting factors through a single computation.

Item Type: Article
DOI/Identification number: 10.1109/TVT.2018.2797957
Uncontrolled keywords: Caching strategy, Cloud-RAN, joint optimization, outage probability, fronthaul usage
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK5101 Telecommunications > TK5103.4 Broadband communication systems
Divisions: Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Huiling Zhu
Date Deposited: 16 Jul 2018 02:58 UTC
Last Modified: 12 Feb 2020 04:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/67620 (The current URI for this page, for reference purposes)
Wang, Jiangzhou: https://orcid.org/0000-0003-0881-3594
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