42 research outputs found
A network paradigm for very high capacity mobile and fixed telecommunications ecosystem sustainable evolution
For very high capacity networks (VHC), the main objective is to improve the
quality of the end-user experience. This implies compliance with key
performance indicators (KPIs) required by applications. Key performance
indicators at the application level are throughput, download time, round trip
time, and video delay. They depend on the end-to-end connection between the
server and the end-user device. For VHC networks, Telco operators must provide
the required application quality. Moreover, they must meet the objectives of
economic sustainability. Today, Telco operators rarely achieve the above
objectives, mainly due to the push to increase the bit-rate of access networks
without considering the end-to-end KPIs of the applications. The main
contribution of this paper concerns the definition of a deployment framework to
address performance and cost issues for VHC networks. We show three actions on
which it is necessary to focus. First, limiting bit-rate through video
compression. Second, contain the rate of packet loss through artificial
intelligence algorithms for line stabilization. Third, reduce latency (i.e.,
round-trip time) with edge-cloud computing. The concerted and gradual
application of these measures can allow a Telco to get out of the
ultra-broadband "trap" of the access network, as defined in the paper. We
propose to work on end-to-end optimization of the bandwidth utilization ratio.
This leads to a better performance experienced by the end-user. It also allows
a Telco operator to create new business models and obtain new revenue streams
at a sustainable cost. To give a clear example, we describe how to realize
mobile virtual and augmented reality, which is one of the most challenging
future services.Comment: 42 pages, 4 tables, 6 figures. v2: Revised Englis
An approach to define Very High Capacity Networks with improved quality at an affordable cost
This paper aims to propose one possible approach in the setting of VHCNs
(Very High Capacity Networks) performance targets that should be capable of
promoting efficient investments for operators and, at the same time, improving
the benefits for end-users. To this aim, we suggest relying on some specific
KPIs (Key Performance Indicators), especially throughput - i.e., the bandwidth
as perceived by the customer - valid at the application layer, instead of the
physical layer data-rate. In this regard, the paper underlines that the
bandwidth perceived is strictly linked to the latency. The most important
implication is that some of the most demanding services envisaged for the
future (e.g., mobile virtual and augmented reality, tactile internet) cannot be
met by merely increasing the low-level protocol data-rate. Therefore, for the
VHCNs reducing latency through Edge Cloud Computing (ECC) is a mandatory
pre-requisite.Comment: 6 pages, 4 figures, 1 tabl
Unbundling in optical access networks: Focus on hybrid fiber-VDSL and TWDM-PON2014 Fotonica AEIT Italian Conference on Photonics Technologies
Unbundling in Current Broadband and Next-Generation Ultra-Broadband Access Networks
This article overviews the methods that are currently under investigation for implementing multi-operator open-access/shared-access techniques in next-generation access ultra-broadband architectures, starting from the traditional "unbundling-of-the-local-loop" techniques implemented in legacy twisted-pair digital subscriber line access networks. A straightforward replication of these copper-based unbundling-of-the-local-loop techniques is usually not feasible on next-generation access networks, including fiber-to-the-home point-to-multipoint passive optical networks. To investigate this issue, the article first gives a concise description of traditional copper-based unbundling-of-the-local-loop solutions, then focalizes on both next-generation access hybrid fiber-copper digital subscriber line fiber-to-the-cabinet scenarios and on fiber to the home by accounting for the mix of regulatory and technological reasons driving the next-generation access migration path, focusing mostly on the European situation. © 2014 Taylor and Francis Group, LLC
Statistical channel modelling and performance evaluation in satellite personal communications
This paper is concerned with channel modelling for satellite personal communications and with the associated problem of performance evaluation. Channel characteristics for personal communications tend to differ from those traditionally accepted for vehicular communications. In this paper we report on modelling aspects for both wideband and narrowband personal communications. Then we consider performance evaluation for low-altitude earth orbit (LEO) satellite systems in terms of bit error probability and outage probability. To evaluate the outage probability for LEO systems, a tight and simple upper bound is finally provided. © 1998 John Wiley & Sons, Ltd