Energy-Efficient Baseband Unit Placement in a Fixed/Mobile Converged WDM Aggregation Network

Energy efficiency is expected to be a key design parameter for next-generation access/aggregation networks. Using a single network infrastructure to aggregate/backhaul both mobile and fixed network traffic, typically referred to as fixed/mobile convergence (FMC), seems a promising strategy to pursue energy efficiency. WDM networks are a prominent candidate to support next-generation FMC network architectures, as they provide huge capacity at relatively low costs and energy consumption. We consider a FMC WDM aggregation network in which the novel concept of “hotelling” of mobile baseband units (BBUs) is employed. The so-called BBU hotelling consists in separating BBUs from their cell sites and consolidating them in single locations, called hotels. As a result, the aggregation network will transport both IP (fixed and mobile) traffic and CPRI (fronthaul) traffic, the latter exchanged between each BBU and its cell site. In this paper, we propose an energy-efficient WDM aggregation network, and we formally define the BBU placement optimization problem, whose objective is to minimize the defined aggregation infrastructure power (AIP). We consider three different network architectures: Bypass, Opaque, and No-Hotel, which feature different placement of BBUs and routing of traffic. By modeling the power contributions of each active device, we study how and how much BBU consolidation, optical bypass, and active traffic aggregation influence the AIP, for all the three architectures. Our results show that, in our case study, the proposed architectures enable savings up to about 60%-65% in dense-urban/urban and about 40% in rural scenarios.

[1]  Luc Martens,et al.  Energy efficiency of femtocell deployment in combined wireless/optical access networks , 2013, Comput. Networks.

[2]  Azer Bestavros,et al.  Distributed Placement of Service Facilities in Large-Scale Networks , 2007, IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications.

[3]  A. Gladisch,et al.  On the energy consumption of FTTH access networks , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[4]  Andreas Gladisch,et al.  Energy consumption of telecommunication networks , 2009, 2009 35th European Conference on Optical Communication.

[5]  Jiajia Chen,et al.  Scalable Passive Optical Network Architecture for Reliable Service Delivery , 2011, IEEE/OSA Journal of Optical Communications and Networking.

[6]  Biswanath Mukherjee,et al.  Energy saving via dynamic wavelength sharing in WDM-PON , 2013, 2013 17th International Conference on Optical Networking Design and Modeling (ONDM).

[7]  A. Pattavina,et al.  A Power Consumption Analysis for IP-Over-WDM Core Network Architectures , 2012, IEEE/OSA Journal of Optical Communications and Networking.

[8]  Massimo Tornatore,et al.  Placement of Base-Band Units (BBUs) over fixed/mobile converged Multi-Stage WDM-PONs , 2013, 2013 17th International Conference on Optical Networking Design and Modeling (ONDM).

[9]  H. T. Mouftah,et al.  Energy efficiency in the extended-reach fiber-wireless access networks , 2012, IEEE Network.

[10]  R.S. Tucker,et al.  Evolution of WDM Optical IP Networks: A Cost and Energy Perspective , 2009, Journal of Lightwave Technology.

[11]  Ahmed Saadani,et al.  Base stations evolution: Toward 4G technology , 2012, 2012 19th International Conference on Telecommunications (ICT).

[12]  Ahmed Saadani,et al.  Digital radio over fiber for LTE-advanced: Opportunities and challenges , 2013, 2013 17th International Conference on Optical Networking Design and Modeling (ONDM).

[13]  Biswanath Mukherjee,et al.  Traffic grooming in an optical WDM mesh network , 2002, IEEE J. Sel. Areas Commun..