access icon free Energy-efficient BBU pool virtualisation for C-RAN with quality of service guarantees

© The Institution of Engineering and Technology
Received 16/02/2019, Accepted 27/08/2019, Revised 05/07/2019, Published 29/08/2019

Cloud radio access network (C-RAN) has been introduced as a promising network paradigm for improving the spectral and energy efficiency of next-generation mobile systems. In C-RAN, the computation resources of the centralised baseband units (BBUs) can be virtualised and dynamically shared among cells for energy-efficient BBU pool utilisation. In this study, a BBU virtualisation scheme is proposed to minimise the total power consumption in the BBU pool subject to constraints on users’ quality of service in terms of real-time requirements, individual fronthaul capacity and BBU capacity. As the BBU processing time and transmission delay for each user data can be compromised to meet the user's real-time requirements while minimising the BBU power consumption, a priori user association phase is proposed and formulated as an optimisation problem to maximise the users’ transmission rate, and hence minimising their transmission delay. Then, the BBU processing allocation phase is formulated as a bin-packing problem to minimise the overall power consumption in the BBU pool. Since this problem is combinatorial, a heuristic algorithm is proposed based on best-fit-decreasing algorithm to solve it. Extensive simulations show that the proposed scheme outperforms the comparable ones in terms of power consumption with reduction up to 33%.

Inspec keywords: bin packing; cloud computing; minimisation; telecommunication power management; telecommunication computing; quality of service; virtualisation; computational complexity; mobile computing; radio access networks; resource allocation

Other keywords: energy-efficient BBU pool utilisation; BBU processing time; computation resources; BBU processing allocation phase; BBU capacity; next-generation mobile systems; energy-efficient BBU pool virtualisation; total power consumption; a priori user association phase; centralised baseband units; real-time requirements; transmission delay; cloud radio access network; energy efficiency; network paradigm; bin-packing problem; spectral efficiency; best-fit-decreasing algorithm; user data; BBU power consumption; BBU virtualisation scheme; BBU pool subject; C-RAN; individual fronthaul capacity; service guarantees

Subjects: Internet software; Radio access systems; Mobile radio systems; Telecommunication systems (energy utilisation); Communications computing; Optimisation techniques; Optimisation techniques

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