期刊
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
卷 9, 期 3, 页码 B22-B32出版社
OPTICAL SOC AMER
DOI: 10.1364/JOCN.9.000B22
关键词
5G mobile/wireless convergence; Cloud RAN; Elastic optical networks; Sliceable transponders
类别
资金
- Spanish MINECO SYNERGY [TEC201459995-R]
- Catalan Institution for Research and Advanced Studies
- DOE [DEFC02-13ER26154]
- National Science Foundation under EECS [1028729]
- Army Research Laboratory [W911NF-14-2-0114]
- Direct For Computer & Info Scie & Enginr [1619173] Funding Source: National Science Foundation
- Directorate For Engineering [1028729] Funding Source: National Science Foundation
- Division Of Computer and Network Systems [1619173] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [1028729] Funding Source: National Science Foundation
Radio access network (RAN) cost savings are expected in future cloud RAN (C-RAN). In contrast to traditional distributed RAN architectures, in C-RAN, remote radio heads (RRHs) from different sites can share baseband processing resources from virtualized baseband unit pools placed in a few central locations (COs). Due to the stringent requirements of the several interfaces needed in C-RAN, optical networks have been proposed to support C-RAN. One of the key elements that needs to be considered are optical transponders. Specifically, sliceable bandwidth-variable transponders (SBVTs) have recently shown many advantages for core optical transport networks. In this paper, we study the connectivity requirements of C-RAN applications and conclude that dynamicity, fine granularity, and elasticity are needed. However, there is no SBVT implementation that supports those requirements, and thus, we propose and assess an SBVT architecture based on dynamic optical arbitrary generation/measurement. We consider different long-term evolution-advanced configurations and study the impact of the centralization level in terms of the capital expense and operating expense. An optimization problem is modeled to decide which COs should be equipped and which equipment, including transponders, needs to be installed. The results show noticeable cost savings from installing the proposed SBVTs compared to installing fixed transponders. Finally, compared to the maximum centralization level, remarkable cost savings are shown when a lower level of centralization is considered.
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