5G mobile access targets unprecedented performance, not only in terms of higher data rates per user and lower latency, but also network intelligence capillarity. To achieve this, networks will resort to solutions as small cell deployment, multipoint coordination (CoMP, ICIC) centralized radio (C-RAN) with baseband units (BBUs) hotelling. As adopting such techniques requires a high-capacity low-latency access/aggregation support backhaul, fronthaul (i.e., digitized signal) traffic, optical...

Paradoxically, with an ever-increasing traffic demand, today transport-network operators experience a progressive erosion of their margins. The alarms change are set, and software define networking (SDN) is coming to the rescue promise reducing capital expenditures operational expenses. Driven by economic needs network innovation facilities, transport SDN (T-SDN) reality. It gained big momentum in last years, however, industry, will be perhaps segment embrace SDN, mainly due heterogeneous...

Virtualization technologies are changing the way network operators deploy and manage Internet services. In particular in this study we focus on new Network Function (NFV) paradigm, which consists instantiating Virtual (VNFs) Commercial-Off-The-Shelf (COSTS) hardware. Adopting NFV can dynamically instantiate Functions (NFs) based current demands conditions, allowing to save capital operational costs. Typically, VNFs concatenated together a sequential order form Service Chains (SCs) that...

The problem of bandwidth allocation in a packet switch supporting broadband services is addressed. To reduce the performance constraints imposed by limiting data link to single channel, author introduces concept channel group as set channels that viewed data-link connection routing entities. He uses two-step scheme. At setup time, call allocated group. transmission specific are optimally packets destined Because statistical smoothing large number sources served group, traffic improved. This...

In general, humans follow a routine with highly predictable daily movements. For instance, we commute from home to work on basis and visit selected set of places for commercial recreational purposes during the nights weekends. The use mobile phones increases when commuting via public transportation, lunch breaks, at night. Such regular behavior creates spatiotemporal fluctuations traffic patterns. this paper, introduce matheuristic dynamic optical routing, which can be implemented as an...

As Internet traffic is estimated to substantially grow in the near future, one of most challenging issues will concern reduction its power requirement. For core/transport section Internet, various network architectures can be considered, typically multi-layer composed an optical wavelength division multiplexing (WDM) transport layer under classical electronic IP layer. Thus, we consider this paper four architectures: basic over WDM with no switching, synchronous digital hierarchy (SDH) WDM,...

In recent years, researchers realized that the analysis of traffic datasets can reveal valuable information for management mobile and metro-core networks. That is getting more true with increase in use social media Internet applications on devices. this work, we focus deep learning methods to make prediction matrices allow us proactively optimize resource allocations optical backbone Recurrent Neural Networks (RNNs) are designed sequence problems they achieved great results past years tasks...

The advantages of employing passive optical architectures in the access network have been largely recognized. Particularly, recent developments technologies made realization wavelength division multiplexing networks (WDM PONs) feasible and cost-effective. These are more future-proof than conventional PONs, thanks to their intrinsic transparency extremely high transmission capacity. A very useful routing device, called waveguide grating router, is basic building-block new PON capable...

General models for a class of nonblocking architectures asynchronous transfer mode (ATM) switches are described. Hardware aspects discussed to show the implementation feasibility proposed switch by means current technology. Performance issues studied point out traffic bottlenecks different structures. It is shown that classification queueing main concept enables ATM switches. Three packet strategies can be adopted in switching fabric: input queueing, shared and output queueing. Switch...

A design technique for reliable optical transport networks is presented. The network first dimensioned in order to carry a given set of static protected connections, each one routed maximizing its availability. can be further optimized by minimizing the number fibers installed, while keeping control on connection availability, which remain same or decrease prefixed margin factor. Design and optimization algorithms are provided adopting dedicated shared path-protection. approach heuristic....

Energy efficiency is expected to be a key design parameter for next-generation access/aggregation networks. Using single network infrastructure aggregate/backhaul both mobile and fixed traffic, typically referred as fixed/mobile convergence (FMC), seems promising strategy pursue energy efficiency. WDM networks are prominent candidate support FMC architectures, they provide huge capacity at relatively low costs consumption. We consider aggregation in which the novel concept of "hotelling"...

The development of optical cross-connect architectures is a very important topic today. We consider here in particular the class space-division switching fabrics configured as multistage structures built with 2/spl times/2 elements (SEs) and derived from combination vertical replication horizontal expansion Banyan networks. determine necessary sufficient conditions for these matrices to be rearrangeably nonblocking free first-order crosstalk SEs. This impairment one major limitations...

Currently, the need for "greener" telecommunication networks is stimulating research efforts to find new solutions cope with power consumption and sustainability issues. Exploiting potential of optical Wavelength Division Multiplexed (WDM) this purpose has been identified as an attractive approach. However, traditional WDM fixed-grid, where 50 GHz-spaced carriers are used Single Line Rates (SLR), may result in lower efficiency from both spectral occupation perspectives. Higher flexibility...

For decades, optical networks have provided larger bandwidths than could be utilized, but with the increasing growth of global Internet traffic demand, new transmission technologies are required to provide a much higher data rate per channel and enable more flexibility in allocation flow. Currently, researchers investigating innovative transceiver architectures capable dynamically adapting modulation format link properties. These transceivers referred as elastic flexible bandwidth resources....

Efficient planning and optimization of wavelength division multiplexing networks is an important issue today. Integer linear programming (ILP) the most used exact method to perform this task. We propose a new ILP formulation that allows solve with less computational effort compared other approaches. This applies multifiber mesh or without conversion, when either total fiber number length cost function be minimized. After presenting we discuss results obtained by exploiting it in two...

This paper deals with the most common protection schemes in WDM optical networks, providing for each of them an algebraic formulation availability analysis. We consider single or multiple link failure scenarios, being a fault that affects all connections routed on involved link. Availability models are applied to some numerical examples allow us compare different degrees granted by technique. When approximation is introduced presented formulas, Monte-Carlo-approach simulation results given...

The mission critical network infrastructures are facing potential large region threats, both intentional (like EMP attack, bomb explosion) and natural earthquake, flooding). available research on failure related vulnerability studies generally adopt a kind of simple "deterministic" models, which can not capture some important features real scenarios, where component in the only fails with certain probability, more importantly, such probability tends to vary its dimension distance center. In...

Telecom operators worldwide are witnessing squeezed profit margins mainly due to hyper‐competition. Hence, new business models/strategies needed help reduce Operational and Capital Expenditures. In this context, the Network Function Virtualization (NFV) paradigm, which consists of running Virtual Instances Functions (NFs) in Commercial‐Off‐The‐Shelf (COTS) hardware, represents a solid alternative. (VNFs) then concatenated together sequential order form service chains (SCs) that provide...

Recent trends in bandwidth markets show that customers are tending to ask providers for a large but limited amount of time support new short-term bandwidth-hungry applications. In order meet these requirements, progress network technologies (fast and reconfigurable switching equipment) protocols [such as generalized multiprotocol label (GMPLS) automatically switched optical (ASON)] is paving the road towards flexible transport networks which leasable circuits could be set up released on...

A switch model for ATM networks is analyzed. Its interconnection network internally nonblocking and provided with dedicated input output queues, one per inlet outlet. The operates an internal speed-up: more than packet slot can be transferred from the head-of-line positions of queues to each queue by network. Two different operation modes are considered interaction between queues: backpressure mode loss mode. analytical developed evaluation performance under random traffic assumes infinite...

Planning and optimization of WDM networks has raised much interest among the research community in last years. Integer linear programming (ILP) is most used exact method to perform this task many studies have been published concerning issue. Unfortunately, works shown that, even for small networks, ILP formulations can easily overwhelm capabilities today state-of-the-art computing facilities. So paper we focus our attention on model computational efficiency order provide a more effective...