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A Network Calculus Based Delay and Backlog Analysis for Cloud Radio Access Networks

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Abstract

Cloud radio access network (C-RAN) has been widely regarded as a promising techniques for 5G cellular mobile communication. By decoupling radio and baseband processing from all-in-one macro base station into remote radio head (RRH) and baseband unit (BBU) pool, C-RAN can significantly improve the flexibility and scalability of cellular mobile system with less ownership cost and operational expenditure. In 5G systems, the delay tolerance is very strict and usually limited within 5ms; while applications hold different quality-of-service (QoS) towards providing proper service. In terms of this, we classify mobile applications with different priorities, each of which holds a specified delay constraint. Based on network calculus, a theory for deterministic queuing systems, we propose an analysis method revealing delay and backlog upper-bounds for applications with different priorities, indicating the minimum required processing capacity of the C-RAN system. Numerical analysis and experiments driven by real data trace are conducted to validate the derived upper-bounds. Experiment results show that the proposed bounds for both delay and backlog in C-RAN hold great potential to guide the mobile network operator for C-RAN deployment and operation.

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Acknowledgements

This research was supported by the Ministry of Education and China Mobile Research Foundation under Grant No. MCM20170307, and the NSF of China under Grant Nos. 61772480, 61602199, 61672474, 61402425.

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Authors and Affiliations

  1. School of Computer Science, China University of Geosciences, Wuhan, 430074, China

    Muzhou Xiong, Haixin Liu, Deze Zeng & Hong Yao

  2. School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China

    Lin Gu

  3. State Key Laboratory of Novel Software Technology, Department of Computer Science and Technology, Nanjing University, Nanjing, 210023, People’s Republic of China

    Zhuzhong Qian

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  1. Muzhou Xiong
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  2. Lin Gu
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  3. Haixin Liu
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Correspondence to Lin Gu.

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Xiong, M., Gu, L., Liu, H. et al. A Network Calculus Based Delay and Backlog Analysis for Cloud Radio Access Networks. Mobile Netw Appl 26, 1172–1181 (2021). https://doi.org/10.1007/s11036-019-01349-w

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