Evaluating the Cloud-RAN architecture: functional splitting and switched Ethernet Xhaul

Ocampo, Andres F.; Fida, Mah-Rukh; Elmokashfi, Ahmed; Bryhni, Haakon

doi:10.23919/cnsm50824.2020.9269057

Cited by 2 publications

(1 citation statement)

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“…These studies have been complemented with other works that mostly focus on the constraints imposed by the fronthaul network [14]. Worth of attention are papers that consider the x-haul (networking resources shared between backhaul and fronthaul) [15]. Along with it, other lines of research have paid attention to the application of regular networking techniques in RAN, which exploit functional splits.…”

Section: Related Workmentioning

confidence: 99%

Flexible Functional Split and Fronthaul Delay: A Queuing-Based Model

et al. 2021

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We study the delay over virtual RAN (vRAN) topologies, entailing base stations that are divided into centralized and distributed units, as well as the packet-switched fronthaul network that connects them. We consider the use of flexible functional split, where the functions that are executed at each of these two entities can be dynamically shifted. We propose a queuing-based model, which is able to precisely mimic the behavior of such nodes, and we validate it by means of extensive simulations. We also exploit Jackson Networks theory to establish the end-to-end delay over the fronthaul network, allowing us to assess the impact of having different networking policies and conditions (for instance, background traffic or heterogeneous technologies). Thanks to the simulator we can also broaden the analysis, by studying the delay variability. In addition, we conduct an in-depth analysis of the performance exhibited by a realistic network setup, whose particular characteristics might hinder the services performance, due to the longer dwell times at each split configuration. The results evince the validity of the proposed model, even under realistic conditions. We show that it might not be enough to guarantee an average stable operation of the centralized/distributed units, but the traffic load should remain below the slowest service rate, to avoid reaching unacceptable delays. An increase of > 100× is observed in the delay, using the realistic network setup, when these conditions do not hold.• We first extend the DU/CU model, by considering not only different service rates per split configuration, but also dwell times. In addition, this enhanced model also permits having different stand-by times after each split, and avoids the possibility of going to the same split after leaving it. • We exploit Jackson Theory and the CU/DU model to yield the overall end-to-end delay, considering the

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Section: Related Workmentioning

confidence: 99%

Flexible Functional Split and Fronthaul Delay: A Queuing-Based Model

et al. 2021

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Reconfigurable optical crosshaul architecture for 6G radio access networks

Tao,

Ranaweera,

Edirisinghe

et al. 2023

J. Opt. Commun. Netw.

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The radio access network (RAN) architecture is undergoing a significant evolution to support the next-generation mobile networks and their emerging applications. To realize scalable and sustainable deployment and operations, RAN needs to consider the requirements of 6G and beyond wireless technologies such as ultra densification of cells, higher data rates, ubiquitous coverage, and new radio spectrum in the millimeter-wave band. This calls for a careful redesign of every aspect of RAN, including its crosshaul. The crosshaul is an important network segment in future RAN, capable of transporting diverse traffic types with varying stringent requirements within RAN. The crosshaul towards 6G is envisioned to be highly intelligent, reconfigurable, and adaptable to dynamic service requirements and network conditions. To this end, we propose a software defined network (SDN)-enabled reconfigurable optical crosshaul architecture (ROCA) that supports heterogeneous crosshaul transport technologies and dynamic functional splittings. ROCA enables efficient and intelligent control of the crosshaul data plane. The proposed architecture with a set of the next-generation RAN (NG-RAN) transport interfaces is evaluated using network models built on the ns-3 network simulator. Simulation results demonstrate the strengths and weaknesses of different crosshaul interfaces in agreement with the understanding of respective NG-RAN interfaces from the literature, which validates the modeling accuracy. We then demonstrate the reconfigurability of the architecture using a dynamic scenario with different reconfiguration strategies for meeting the user and network demands. The results indicate that ROCA serves as a scalable and flexible foundation for supporting high-capacity delay-stringent RAN that can be used in 6G and beyond wireless technologies.

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Evaluating the Cloud-RAN architecture: functional splitting and switched Ethernet Xhaul

Cited by 2 publications

References 10 publications

Flexible Functional Split and Fronthaul Delay: A Queuing-Based Model

Flexible Functional Split and Fronthaul Delay: A Queuing-Based Model

Reconfigurable optical crosshaul architecture for 6G radio access networks

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