Resilient architecture for optical access networks
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ORIGINAL PAPER
Resilient architecture for optical access networks C. Christodoulou1 · G. Ellinas1 Received: 14 June 2019 / Accepted: 20 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This work proposes a resilient wheel-based wavelength-division-multiplexed passive optical network optical access network architecture for backhauling network traffic. This proposed resilient architecture can efficiently support not only the fixed users but also the mobile users in the downstream direction under normal and failure operating scenarios, while minimizing the average traffic delivery time and without using extra redundant fibers for protection purposes. Keywords Optical access network · Resiliency · Failure protection
1 Introduction Currently, more and more high-bandwidth services and applications are becoming mainstream, thus service providers are always searching for architecture solutions for the access arena in order to be able to efficiently and effectively backhaul the network traffic. This is taking place, while also considering the integration of next-generation optical access architectures with mobile broadband access technologies that can fully support both mobile and fixed traffic. As wireless/mobile networks have recently received significant attention, this has resulted in an imbalance between the current fixed and future mobile components of next-generation networks; thus, as also highlighted by the ITU-T Focus Group Technologies for Network 2030 (FG NET-2030) [1], next-generation fixed access networks are required to be developed in order to support and guarantee the data throughput of mobile broadband networks. In recent years, a significant amount of research work has taken place focusing on the integration of passive optical networks (PONs) and wireless broadband access technologies, mostly proposing numerous hybrid fiber-wireless
* G. Ellinas [email protected] C. Christodoulou [email protected] 1
Department of Electrical and Computer Engineering and KIOS Research and Innovation Center of Excellence, University of Cyprus, 75 Kallipoleos Street, P.O. Box 20537, 1678 Nicosia, Cyprus
(FiWi) network architectures that will enable the support of fixed-mobile applications and services independent of the access infrastructure [2–4]. These architectures are utilizing the fiber-based passive optical access network to backhaul mobile traffic and can support various residential and business services [5]. Most of these proposed architectures are centralized architectures and can be categorized as (i) independent architectures, where both the wireless and fiber segments are operating independently, by considering the base station (BS) as another user connected to an optical networking unit (ONU), and (ii) integrated architectures, where the ONUs and BSs are co-located and the mobile and fixed traffic are addressed in an integrated fashion. In the latter case, interconnecting the BSs and ONUs via a common standard communication interface is requi
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