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Energy-Efficient Virtual Base Station Formation in Optical-Access-Enabled
Cloud-RAN
Abstract:
In recent years, the increasing traffic demand in radio access networks (RANs) has
led to considerable growth in the number of base stations (BSs), posing a serious
scalability issue, including the energy consumption of BSs. Optical-access-
enabled Cloud-RAN (CRAN) has been recently proposed as a next-generation
access network. In CRAN, the digital unit (DU) of a conventional cell site is
separated from the radio unit (RU) and moved to the “cloud” (DU cloud) for
centralized signal processing and management. Each DU/RU pair exchanges
bandwidth-intensive digitized baseband signals through an optical access network
(fronthaul). Time-wavelength division multiplexing (TWDM) passive optical
network (PON) is a promising fronthaul solution due to its low energy
consumption and high capacity. In this paper, we propose and leverage the
concept of a virtual base station (VBS), which is dynamically formed for each cell
by assigning virtualized network resources, i.e., a virtualized fronthaul link
connecting the DU and RU, and virtualized functional entities performing
baseband processing in DUcloud. We formulate and solve the VBS formation
(VF) optimization problem using an integer linear program (ILP). We propose
novel energy-saving schemes exploiting VF for both the network planning stage
and traffic engineering stage. Extensive simulations show that CRAN with our
proposed VF schemes achieves significant energy savings compared to traditional
RAN and CRAN without VF.

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Energy efficient virtual base station formation in optical-access-enabled cloud-ran

  • 1. Energy-Efficient Virtual Base Station Formation in Optical-Access-Enabled Cloud-RAN Abstract: In recent years, the increasing traffic demand in radio access networks (RANs) has led to considerable growth in the number of base stations (BSs), posing a serious scalability issue, including the energy consumption of BSs. Optical-access- enabled Cloud-RAN (CRAN) has been recently proposed as a next-generation access network. In CRAN, the digital unit (DU) of a conventional cell site is separated from the radio unit (RU) and moved to the “cloud” (DU cloud) for centralized signal processing and management. Each DU/RU pair exchanges bandwidth-intensive digitized baseband signals through an optical access network (fronthaul). Time-wavelength division multiplexing (TWDM) passive optical network (PON) is a promising fronthaul solution due to its low energy consumption and high capacity. In this paper, we propose and leverage the concept of a virtual base station (VBS), which is dynamically formed for each cell by assigning virtualized network resources, i.e., a virtualized fronthaul link connecting the DU and RU, and virtualized functional entities performing baseband processing in DUcloud. We formulate and solve the VBS formation (VF) optimization problem using an integer linear program (ILP). We propose novel energy-saving schemes exploiting VF for both the network planning stage and traffic engineering stage. Extensive simulations show that CRAN with our proposed VF schemes achieves significant energy savings compared to traditional RAN and CRAN without VF.