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As an extension to cloud computing, Mobile Edge Computing (MEC) provides computing capability at close proximity to mobile users to reduce service latency and improve users' quality of experience. In MEC, tiny datacenters, equipped with computing and storage capabilities, are located at the edge of the mobile network. Services in these tiny datacenters are supported by application-specific software...
Centralized Radio Access Network (C-RAN) is a promising mobile network architecture to face the increasing mobile traffic demand. In this paper, we propose a detailed model to evaluate the statistical multiplexing gain achieved through C-RAN baseband pooling, and based on this model we can perform a cost analysis taking into consideration different geographical type areas (geotypes). We show the influence...
Internet of Things (IoT) traffic will become increasingly heterogeneous not only in terms of traditional metrics as required bandwidth and maximum latency, but also in terms of functional requirements such as compute power and temporary storage. Sophisticated planning and engineering approaches must be adopted by service providers to account for this heterogeneity, inherent in IoT applications. Metropolitan...
A scalable, low-latency, high-speed, and energy-efficient datacenter network represents a key element in the deployment of cloud-oriented large-scale datacenters. Photonic switch (PS) architectures can be a solution due to the inherent benefits of optical technology. In this study, we numerically investigate the performance of a packet-switched optical network (PSON) architecture with centralized...
We investigate a machine-learning technique that predicts whether the bit-error-rate of unestablished lightpaths meets the required threshold based on traffic volume, desired route and modulation format. The system is trained and tested on synthetic data.
We propose and compare different baseband-processing-placement strategies in optical aggregation networks. Proper trade-off between baseband-resources consolidation and network blocking can be obtained by dynamically adapting location of processing resources to traffic conditions.
Effective post-disaster cloud-network recovery can significantly improve users' access to important cloud services. We propose a joint progressive recovery strategy for optical network and datacenters to maximize content reachability to users at each repair stage.
We propose close-to-optimal network resource allocation algorithms for modular data centers using optical spatial division multiplexing. A trade-off between the number of established connections and throughput is identified and quantified.
Today's communication networks require special redundancy to overcome severe multiple element failures. These severe failures can isolate entire sub-components of terrestrial networks — e.g., possible aftermath of natural disasters and threats such as a High-Altitude Electromagnetic Pulse (HEMP). An integrated use of all communication systems available is important to help lessen the impact over distressed...
For the incoming 5G mobile communications, enhanced cell coordination is deemed as crucial to maximize network throughput. In this paper we focus on the impact that the placement of coordination controllers in the metro optical network has on the performance of cell coordination, and we aim at verifying how throughput maximization can be achieved through optimized controller placement. Specifically,...
Centralized Radio Access Network (C-RAN) has been recently proposed to increase network capacity, reduce energy consumption, and improve scalability. However, C-RAN requires an extensive modification to the current infrastructure, which results in a considerable deployment cost. In this paper, we conduct a techno-economic study to evaluate the migration cost of C-RAN, and we propose a methodology...
5G Radio Access Networks (RANs) are supposed to increase their capacity by 1000x to handle growing number of connected devices and increasing data rates. The concept of cloud-RAN (CRAN) has been recently proposed to decouple digital units (DUs) and radio units (RUs) of base stations (BSs), and centralize DUs into central offices. CRAN can ease the implementation of advanced radio coordination techniques,...
Cloud Radio Access Network (C-RAN) will improve mobile radio coordination and resource efficiency by allowing baseband processing unit (BBU) functions to be virtualized and centralized, i.e., deployed in a BBU hotel. We consider a BBU hoteling scheme based on the concept of access cloud network (ACN). An ACN consists of virtualized BBUs (vBBUs) placed in metro cloud data centers (metro DCs). A vBBU...
The booming of mobile communications has brought operators to face the issue to improve network capacity utilization to provide high quality of experience to end users. One way to exploit efficiently the available network capacity is mobile data offloading, which allows network operators to reduce congestion by offloading some traffic to other operators' networks, possibly based on different technologies,...
Due to the increasing dependence on network services of our society, research has recently been concentrating on enhancing traditional protection strategies to withstand large-scale failures, as in case of disaster events. The recently-formed EU-funded RECODIS project aims at coordinating and fostering research collaboration in Europe on disaster resiliency in communication networks. In particular,...
Virtualization technologies are changing the way network operators deploy and manage Internet services. In particular in this study we focus on the new Network Function Virtualization (NFV) paradigm, which consists in instantiating Virtual Network Function (VNFs) in Commercial-Off-The-Shelf (COSTS) hardware. Adopting NFV network operators can dynamically instantiate Network Functions (NFs) based on...
Recent natural disasters have revealed that emergency networks presently cannot disseminate the necessary disaster information, making it difficult to deploy and coordinate relief operations. These disasters have reinforced the knowledge that telecommunication networks constitute a critical infrastructure of our society, and the urgency in establishing protection mechanisms against disaster-based...
For RSA optimization in few-mode flexi-grid rings, we derive distance-adaptive reaches for low MIMO complexity transceivers up to 5 modes and optimally solve the problem under two different assumptions on spatial flexibility.
We propose and evaluate four optical interconnect architectures based on spatial division multiplexing for ultra-high capacity modular data centers. It is shown in which way the best option depends on the network load and size.
The Network Function Virtualization paradigm enables the possibility to dynamically instantiate Virtual Network Functions (VNFs) in Commercial-Off-The-Shelf (COTS) hardware. Such VNFs are then concatenated together in Service Chains (SCs) to provide specific Internet services to the users. Depending on latency requirements for such services and considering the aim of maximally consolidating the VNFs...
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