1,570 research outputs found
Protocol for Extreme Low Latency M2M Communication Networks
As technology evolves, more Machine to Machine (M2M) deployments and mission critical
services are expected to grow massively, generating new and diverse forms of data
traffic, posing unprecedented challenges in requirements such as delay, reliability, energy
consumption and scalability. This new paradigm vindicates a new set of stringent requirements
that the current mobile networks do not support. A new generation of mobile
networks is needed to attend to this innovative services and requirements - the The fifth
generation of mobile networks (5G) networks. Specifically, achieving ultra-reliable low
latency communication for machine to machine networks represents a major challenge,
that requires a new approach to the design of the Physical (PHY) and Medium Access
Control (MAC) layer to provide these novel services and handle the new heterogeneous
environment in 5G. The current LTE Advanced (LTE-A) radio access network orthogonality
and synchronization requirements are obstacles for this new 5G architecture, since
devices in M2M generate bursty and sporadic traffic, and therefore should not be obliged
to follow the synchronization of the LTE-A PHY layer. A non-orthogonal access scheme
is required, that enables asynchronous access and that does not degrade the spectrum.
This dissertation addresses the requirements of URLLC M2M traffic at the MAC layer.
It proposes an extension of the M2M H-NDMA protocol for a multi base station scenario
and a power control scheme to adapt the protocol to the requirements of URLLC. The
system and power control schemes performance and the introduction of more base stations
are analyzed in a system level simulator developed in MATLAB, which implements
the MAC protocol and applies the power control algorithm.
Results showed that with the increase in the number of base stations, delay can be
significantly reduced and the protocol supports more devices without compromising
delay or reliability bounds for Ultra-Reliable and Low Latency Communication (URLLC),
while also increasing the throughput. The extension of the protocol will enable the study
of different power control algorithms for more complex scenarios and access schemes that
combine asynchronous and synchronous access
SymbioCity: Smart Cities for Smarter Networks
The "Smart City" (SC) concept revolves around the idea of embodying
cutting-edge ICT solutions in the very fabric of future cities, in order to
offer new and better services to citizens while lowering the city management
costs, both in monetary, social, and environmental terms. In this framework,
communication technologies are perceived as subservient to the SC services,
providing the means to collect and process the data needed to make the services
function. In this paper, we propose a new vision in which technology and SC
services are designed to take advantage of each other in a symbiotic manner.
According to this new paradigm, which we call "SymbioCity", SC services can
indeed be exploited to improve the performance of the same communication
systems that provide them with data. Suggestive examples of this symbiotic
ecosystem are discussed in the paper. The dissertation is then substantiated in
a proof-of-concept case study, where we show how the traffic monitoring service
provided by the London Smart City initiative can be used to predict the density
of users in a certain zone and optimize the cellular service in that area.Comment: 14 pages, submitted for publication to ETT Transactions on Emerging
Telecommunications Technologie
Internet of Things-aided Smart Grid: Technologies, Architectures, Applications, Prototypes, and Future Research Directions
Traditional power grids are being transformed into Smart Grids (SGs) to
address the issues in existing power system due to uni-directional information
flow, energy wastage, growing energy demand, reliability and security. SGs
offer bi-directional energy flow between service providers and consumers,
involving power generation, transmission, distribution and utilization systems.
SGs employ various devices for the monitoring, analysis and control of the
grid, deployed at power plants, distribution centers and in consumers' premises
in a very large number. Hence, an SG requires connectivity, automation and the
tracking of such devices. This is achieved with the help of Internet of Things
(IoT). IoT helps SG systems to support various network functions throughout the
generation, transmission, distribution and consumption of energy by
incorporating IoT devices (such as sensors, actuators and smart meters), as
well as by providing the connectivity, automation and tracking for such
devices. In this paper, we provide a comprehensive survey on IoT-aided SG
systems, which includes the existing architectures, applications and prototypes
of IoT-aided SG systems. This survey also highlights the open issues,
challenges and future research directions for IoT-aided SG systems
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