21,082 research outputs found
Configurable Distributed Physical Downlink Control Channel for 5G New Radio: ResourceBundling and Diversity Trade-off
New radio technologies for the fifth generation of wireless system have been
extensively studied globally. Specifically, air interface protocols for 5G
radio access network will be standardized in coming years by 3GPP. Due to its
crucial function in scheduled system, physical layer downlink control channel
(PDCCH) is a core element to enable all physical layer data transmissions.
Recently, configurable distributed PDCCH with the intention to cope with
different scenarios has been developed in 3GPP. To have comprehensive
understanding of respective technical advantages and potential scenario
dependent limitations, detailed performance analysis and evaluations of
configurable distributed PDCCH are thoroughly studied in this paper. In
particular, exponential effective SNR mapping (EESM) has been employed as the
performance metric of configurable distributed PDCCH in different scenarios. It
is demonstrated from EESM results that configurable distributed PDCCH offers
additional degree of freedom for the trade-off between achieved frequency
diversity and channel estimation gain by adjusting resource bundling level
according to the channel and interference scenario experienced by the control
channel transmission
A Configurable Transport Layer for CAF
The message-driven nature of actors lays a foundation for developing scalable
and distributed software. While the actor itself has been thoroughly modeled,
the message passing layer lacks a common definition. Properties and guarantees
of message exchange often shift with implementations and contexts. This adds
complexity to the development process, limits portability, and removes
transparency from distributed actor systems.
In this work, we examine actor communication, focusing on the implementation
and runtime costs of reliable and ordered delivery. Both guarantees are often
based on TCP for remote messaging, which mixes network transport with the
semantics of messaging. However, the choice of transport may follow different
constraints and is often governed by deployment. As a first step towards
re-architecting actor-to-actor communication, we decouple the messaging
guarantees from the transport protocol. We validate our approach by redesigning
the network stack of the C++ Actor Framework (CAF) so that it allows to combine
an arbitrary transport protocol with additional functions for remote messaging.
An evaluation quantifies the cost of composability and the impact of individual
layers on the entire stack
Survey on wireless technology trade-offs for the industrial internet of things
Aside from vast deployment cost reduction, Industrial Wireless Sensor and Actuator Networks (IWSAN) introduce a new level of industrial connectivity. Wireless connection of sensors and actuators in industrial environments not only enables wireless monitoring and actuation, it also enables coordination of production stages, connecting mobile robots and autonomous transport vehicles, as well as localization and tracking of assets. All these opportunities already inspired the development of many wireless technologies in an effort to fully enable Industry 4.0. However, different technologies significantly differ in performance and capabilities, none being capable of supporting all industrial use cases. When designing a network solution, one must be aware of the capabilities and the trade-offs that prospective technologies have. This paper evaluates the technologies potentially suitable for IWSAN solutions covering an entire industrial site with limited infrastructure cost and discusses their trade-offs in an effort to provide information for choosing the most suitable technology for the use case of interest. The comparative discussion presented in this paper aims to enable engineers to choose the most suitable wireless technology for their specific IWSAN deployment
Malicious Node Detection in MANET
A mobile ad hoc network consists of mobile wireless nodes. Â MANET is a self organized and self configurable network where the mobile nodes move arbitrarily. The mobile nodes can receive and forward packets as a router. Routing is a critical issue in MANET.In this paper a new scheme has been proposed for security. A comparative study for the performance of the protocols has been done varying in pause time using Network Simulator-2. Performances of the protocols have been compared by taking three metrics as; Packet Delivery Ratio, End to End Delay and Throughput
EYES - Energy Efficient Sensor Networks
The EYES project (IST-2001-34734) is a three years European research project on self-organizing and collaborative energy-efficient sensor networks. It will address the convergence of distributed information processing, wireless communications, and mobile computing. The goal of the project is to develop the architecture and the technology which enables the creation of a new generation of sensors that can effectively network together so as to provide a flexible platform for the support of a large variety of mobile sensor network applications. This document gives an overview of the EYES project
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