2,582 research outputs found
End-to-End Design and Evaluation of mmWave Cellular Networks
Full text linkThe next generation of cellular networks (5G) is being designed to provide unprecedented performance in mobile scenarios, with an increase in capacity, ultra-low latency and a massive number of connections. This will require the integration of novel technologies in more advanced and complex networks. Millimeter wave (mmWave) communications are considered as a key enabler for ultra-high datarates and low latency, thanks to the massive amount of available bandwidth at such high frequencies. Nonetheless, there are a number of challenges that must be solved before this technology can be deployed, mainly related to the high propagation loss, the need for directional communications and the blockage.
This thesis provides system-level solutions to make mmWave mobile networks more reliable, robust and better performing. Notably, we consider mmWave links as a part of more complex, end-to-end networks, in which the quality of experience that the end user perceives is the result of the interaction among the variability and unreliability of the mmWave channel, the full protocol stack, and the deployment strategy of the wireless network. To this end, we develop and describe a tool for the simulation of end-to-end mmWave cellular networks that, combined with analysis and experimental results, makes it possible to consistently evaluate how these systems behave in their entirety.
The main research areas that this thesis explores are the design and evaluation of (i) architectures for mmWave systems, in terms of mobility and beam management, and wireless backhaul solutions; (ii) protocols for end-to-end connectivity over mmWave networks; and (iii) intelligent and data-driven optimizations in cellular networks. Among other results, we highlight the importance of multi connectivity for mmWave systems, in the access network and at the transport layer, discuss the tradeoffs of beam management in 3GPP NR, propose how to update protocols at the transport layer for an improved end-to-end performance, and evaluate practical approaches for the integration of intelligent techniques in 5G networks
The strategic role of local banks' networks for quality standards of corporate banking services for SMEs
No full textIn many countries the majority of banks is characterized by a local dimension, giving the important relationship with stakeholders perceivable on a local basis. However, the current concentration process of banking sector has gradually reduced local banks number
leaving space and market to banks of greater dimensions. The morphological evolution has created a condition for which local banks’ role seems to be risky, as well as its positioning in bank market.
Hence, it seems appropriate to investigate local banks corporate banking services, with specific reference to their services and quality performances, in order to verify if and to which extent they may promote or guarantee territorial competitiveness especially in
context where SMEs have historically had strong relationships with banks of minor dimension.
Starting from the relationship’s analysis between banks and enterprises, the contribution deepens quality standards and characteristics of corporate banking in specific territorial services, observing service’s traits and changes following the cited metamorphosis. In this sense, the paper suggests how a polycentric network of local banks may be an effective organizational solution capable of leveraging corporate banking services offered
by local banks to the high standards of banks groups, strengthening service quality and banks performances for their stakeholders and clients benefits.
Keywords: Local banks; bank network; SMEs, bank services; local development
TCP and MP-TCP in mmWave 5G Networks
No full textFuture 5G networks will likely include mmWave radio access communication links, because of their potential multi-gigabit-per-second capacity. However, these frequencies are characterized by very dynamic channel conditions which lead to wide fluctuations in the received signal quality. This article explains how the end-to-end user experience in mobile mmWave networks could be affected by a sub-optimal interaction between the most widely used transport protocol, TCP, and mmWave links. It also provides insights on the throughput-latency trade-off when Multipath TCP (MP-TCP) is used judiciously across various links (e.g., LTE and mmWave)
Performance Comparison of Dual Connectivity and Hard Handover for LTE-5G Tight Integration
No full textMulti-Sector and Multi-Panel Performance in 5G mmWave Cellular Networks
No full textThe next generation of cellular networks (5G) will exploit the mmWave spectrum to increase the available capacity. Communication at such high frequencies, however, suffers from high path loss and blockage, therefore directional transmissions using antenna arrays and dense deployments are needed. Thus, when evaluating the performance of mmWave mobile networks, it is necessary to accurately model the complex channel, the directionality of the transmission, but also the interplay that these elements can have with the whole protocol stack, both in the radio access and in the higher layers. In this paper, we improve the channel model abstraction of the mmWave module for ns-3, by introducing the support of a more realistic antenna array model, compliant with 3GPP NR requirements, and of multiple antenna arrays at the base stations and mobile handsets. We then study the end-to-end performance of a mmWave cellular network by varying the channel and antenna array configurations, and show that increasing the number of antenna arrays and, consequently, the number of sectors is beneficial for both throughput and latency
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