214 research outputs found
Single-Layer versus Multilayer Preplanned Lightpath Restoration
Special Issue on ”Optical Networks” October 200
Virtualized eNB Latency Limits
In flexible functional split, functions of a virtualized evolved NodeB (eNB) can be disaggregated in distributed computational resources. One of the main constraints for their placement is the latency experienced by the communication between the Virtual Machines (VM) hosting the functions. This paper evaluates experimentally the latency limits for different functional splits providing insights on flexible functional split implementationThis work has been partially funded by the EU H2020 5G-Transformer Project (grant no. 761536
Orchestrating Lightpath Adaptation and Flexible Functional Split to Recover Virtualized RAN Connectivity
This study shows that a two-step recovery scheme orchestrating lightpath transmission adaptation and evolved NodeB (eNB) functional split reconfiguration preserves the Virtualized RAN fronthaul connectivity even when network capacity is scarce.This work has been partially funded by the EU H2020 “5G-Transformer” Project (grant no. 761536
Efficient Management of Flexible Functional Split through Software Defined 5G Converged Access
Softwarization of mobile and optical networks facilitates
the inter-working between control planes of the two
domains, allowing a more efficient management of available
resources. Radio resource utilization benefits from the centralization
of mobile network functionalities with the application
of high-order functional split options by fronthauling. However,
higher-order options require larger bandwidth and lower latency
in the fronthaul. Advanced mechanisms for the joint control of
the access network represent the sole solution to support such
fronthaul requirements. This paper proposes a new cooperation
scheme to manage the adaptive flexible functional split in 5G
networks conditioned to the resource availability in the optical
access network. Results show that the proposed converged
approach guarantees the optimal allocation of optical resources
through a software defined wavelength and bandwidth allocation.
The proposed scheme adapts to current traffic demand and
simultaneously allows the mobile network to take advantage of
the highest possible centralization of mobile network functions
by leveraging flexible functional split adaptively compliant to the
current optical traffic demand.This work was partially supported by the Italian Government
under CIPE resolution no. 135 (December 21, 2012),
project INnovating City Planning through Information and
Communication Technologies (INCIPICT) and by the EC
through the H2020 5G-TRANSFORMER project (Project ID
761536
Exploiting flexible functional split in converged software defined access networks
5G targets to offer a huge network capacity to support the expected unprecedented traffic growth due mainly to mobile and machine-type services. Thus, the 5G access network has to comply with very challenging architectural requirements. Mobile network scalability is achieved by playing appropriately with the centralization of network functions and by applying the functional split introducing the fronthaul. Although more advantageous in terms of network management and performance optimization, low-layer functional split options require larger bandwidth and lower latency to be guaranteed by the fronthaul in the access network, while preserving other concurrent fiber-to-the-x services. Thus, advanced mechanisms for the efficient management of available resources in the access network are required to control jointly both radio and optical domains. Softwarized mobile and optical segments facilitate the introduction of dedicated protocols to enable the inter-working of the two control planes. This paper proposes a new cooperation scheme to manage the adaptive flexible functional split in 5G networks conditioned to the resource availability in the optical access network. Techniques for the accurate estimation of available bandwidth and the associated real-time selection of the best suitable functional split option are investigated. Results show that the proposed software defined converged approach to wavelength and bandwidth management guarantees the optimal allocation of optical resources. The triple exponential smoothing forecasting technique enables efficient coexistence of mobile fronthaul and fixed connectivity traffic in the network, reducing traffic impairments with respect to other well-known forecasting techniques, while keeping the same level of centralization.This work was partially supported by the Italian Government under CIPE resolution no. 135 (December 21, 2012), project INnovating City Planning through Information and Communication Technologies (INCIPICT) and by the EC through the H2020 5G-TRANSFORMER project (Project ID 761536)
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