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Author: Abdallah Shami Publisher: ISBN: Category : Languages : en Pages :
Book Description
The need for energy efficient communications is essential in current and next-generation wireless communications systems. A large component of energy expenditure in mobile devices is in the mobile radio interface. Proper scheduling and resource allocation techniques that exploit instantaneous and long-term average knowledge of the channel, queue state and quality of service parameters can be used to improve the energy efficiency of communication. This thesis focuses on exploiting queue and channel state information as well as quality of service parameters in order to design energy efficient scheduling techniques. The proposed designs are for multi-stream, multi-channel systems and in general have high computational complexity. The large contributions of this thesis are in both the design of optimal/near-optimal scheduling/resource allocation schemes for these systems as well as proposing complexity reduction methods in their design. Methods are proposed for both a MIMO downlink system as well as an LTE uplink system. The effect of power efficiency on quality of service parameters is well studied as well as complexity/efficiency comparisons between optimal/near optimal allocations.
Author: Abdallah Shami Publisher: ISBN: Category : Languages : en Pages :
Book Description
The need for energy efficient communications is essential in current and next-generation wireless communications systems. A large component of energy expenditure in mobile devices is in the mobile radio interface. Proper scheduling and resource allocation techniques that exploit instantaneous and long-term average knowledge of the channel, queue state and quality of service parameters can be used to improve the energy efficiency of communication. This thesis focuses on exploiting queue and channel state information as well as quality of service parameters in order to design energy efficient scheduling techniques. The proposed designs are for multi-stream, multi-channel systems and in general have high computational complexity. The large contributions of this thesis are in both the design of optimal/near-optimal scheduling/resource allocation schemes for these systems as well as proposing complexity reduction methods in their design. Methods are proposed for both a MIMO downlink system as well as an LTE uplink system. The effect of power efficiency on quality of service parameters is well studied as well as complexity/efficiency comparisons between optimal/near optimal allocations.
Author: Ashima Gupta Publisher: ISBN: 9781109661842 Category : Languages : en Pages :
Book Description
Wireless networks and devices are ubiquitous today. This is primarily due to the increased mobility, flexibility and connectivity as well as high speed and low cost deployment that they provide. However quality of service, capacity, spectral efficiency and battery lifetime are some major concerns of wireless devices and networks. The broadcast nature of wireless media makes them prone to losses and high bit error rates. These variabilities make it challenging to guarantee quality of service parameters like rate, latency and jitter. Wireless devices consume more power than corresponding wired devices. These devices function on limited battery capacity to facilitate portability and mobility. Hence, their operational lifecycle is governed by the efficiency of their battery usage. The objective of this thesis is to analyze and apply novel application aware cross-layer scheduling techniques for energy conservation and quality enhancement in multi-hop wireless networks. We focus on scheduling techniques as many of these can integrated with existing systems and incorporated in new designs. Application awareness helps to identify the constraints and requirements at lower network layers (network and MAC layer). This facilitates the lower layers to perform prioritized scheduling to optimize bandwidth utilization for class differentiated flows and devise adaptive sleep-awake scheduling while minimizing the impact on quality of service. Specifically, we identify three applications: OFDMA based multi-hop networks, Sensor networks and Voice over Internet Protocol (VoIP). We model QoS aware centralized slot allocation scheme for prioritized flows in OFDMA based networks as an ILP that maximizes the described Flow Admittance metric. Several computationally tractable heuristics are compared for efficiency using different topologies and workloads. We enhance this solution for IEEE 802.16j networks making it scalable and adaptive to rate changes and link demands. We illustrate how a multi-channel sensor network scheduling scheme results in considerable energy savings when used to model a moving phenomenon or to deploy a heterogeneous sensor network. This is achieved without significant degradation in data gathering: quality or latency. Finally, we show how an adaptive scanning technique utilizing the sleep-awake scheduling in Wi-Fi networks is used to conserve energy and increase battery lifetime in VoIP Wi-Fi devices.
Author: Randal Berry Publisher: Springer Nature ISBN: 3031792548 Category : Computers Languages : en Pages : 84
Book Description
Packet delay and energy consumption are important considerations in wireless and sensor networks as these metrics directly affect the quality of service of the application and the resource consumption of the network; especially, for a rapidly growing class of real-time applications that impose strict restrictions on packet delays. Dynamic rate control is a novel technique for adapting the transmission rate of wireless devices, almost in real-time, to opportunistically exploit time-varying channel conditions as well as changing traffic patterns. Since power consumption is not a linear function of the rate and varies significantly with the channel conditions, adapting the rate has significant benefits in minimizing energy consumption. These benefits have prompted significant research in developing algorithms for achieving optimal rate adaptation while satisfying quality of service requirements. In this book, we provide a comprehensive study of dynamic rate control for energy minimization under packet delay constraints. We present several formulations and approaches adopted in the literature ranging from discrete-time formulations and dynamic programming based solutions to continuous-time approaches utilizing ideas from network calculus and stochastic optimal control theory. The goal of this book is to expose the reader to the important problem of wireless data transmission with delay constraints and to the rich set of tools developed in recent years to address it. Table of Contents: Introduction / Transmission Rate Adaptation under Deadline Constraints / Average Delay Constraints
Author: Soham Sarkar Publisher: John Wiley & Sons ISBN: 1119571383 Category : Technology & Engineering Languages : en Pages : 292
Book Description
A comprehensive review of the most recent applications of intelligent multi-modal data processing Intelligent Multi-Modal Data Processing contains a review of the most recent applications of data processing. The Editors and contributors – noted experts on the topic – offer a review of the new and challenging areas of multimedia data processing as well as state-of-the-art algorithms to solve the problems in an intelligent manner. The text provides a clear understanding of the real-life implementation of different statistical theories and explains how to implement various statistical theories. Intelligent Multi-Modal Data Processing is an authoritative guide for developing innovative research ideas for interdisciplinary research practices. Designed as a practical resource, the book contains tables to compare statistical analysis results of a novel technique to that of the state-of-the-art techniques and illustrations in the form of algorithms to establish a pre-processing and/or post-processing technique for model building. The book also contains images that show the efficiency of the algorithm on standard data set. This important book: Includes an in-depth analysis of the state-of-the-art applications of signal and data processing Contains contributions from noted experts in the field Offers information on hybrid differential evolution for optimal multilevel image thresholding Presents a fuzzy decision based multi-objective evolutionary method for video summarisation Written for students of technology and management, computer scientists and professionals in information technology, Intelligent Multi-Modal Data Processing brings together in one volume the range of multi-modal data processing.
Author: Qi Liu Publisher: Springer Nature ISBN: 9811665540 Category : Technology & Engineering Languages : en Pages : 1700
Book Description
This conference proceeding is a collection of the papers accepted by the CENet2021 – the 11th International Conference on Computer Engineering and Networks held on October 21-25, 2021 in Hechi, China. The topics focus but are not limited to Internet of Things and Smart Systems, Artificial Intelligence and Applications, Communication System Detection, Analysis and Application, and Medical Engineering and Information Systems. Each part can be used as an excellent reference by industry practitioners, university faculties, research fellows and undergraduates as well as graduate students who need to build a knowledge base of the most current advances and state-of-practice in the topics covered by this conference proceedings. This will enable them to produce, maintain, and manage systems with high levels of trustworthiness and complexity.
Author: Luís Miguel Borges Publisher: CRC Press ISBN: 1000794733 Category : Technology & Engineering Languages : en Pages : 432
Book Description
Wireless Sensor Networks (WSNs) and the Internet of Things are facing tremendous advances both in terms of energy-efficiency as well as in the number of available applications. Consequently, there are challenges that need to be tackled for the future generation of WSNs. After giving an overview of the WSN protocols and IEEE 802.15.4 standard, this book proposes IEEE 802.15.4 Medium Access Control (MAC) sub-layer performance enhancements by employing not only RTS/CTS combined with packet concatenation but also scheduled channel poling (MC-SCP). Results have shown that the use of the RTS/CTS mechanism improves channel efficiency by decreasing the deferral time before transmitting a data packet. Furthermore, the Sensor Block Acknowledgment MAC (SBACK-MAC) protocol enables more efficiency as it allows the aggregation of several acknowledgement responses in one special Block Acknowledgment (BACK) Response packet. The throughput and delay performance have been mathematically derived under both ideal conditions (a channel environment with no transmission errors) and non-ideal conditions (with transmission errors). Simulation results successfully validate the proposed analytical models. This research reveals the importance of an appropriate design for the MAC sub-layer protocol for the desired WSN application. Depending on the mission of the WSN application, different protocols are required. Therefore, the overall performance of a WSN application certainly depends on the development and application of suitable e.g., MAC, network layer protocols.
Author: Rajesh Babu Prathipati Publisher: ISBN: Category : Languages : en Pages :
Book Description
Battery-powered portable embedded systems have been widely used in many applications. These embedded systems have to concurrently perform a multitude of complex tasks under stringent time constraints. As these systems become more complex and incorporate more functionality, they became more power-hungry. Thus, reducing power consumption and extending battery lifespan while guaranteeing the timing constraints has became a critical aspect in designing such systems. This gives rise to three aspects of research: (i) Guaranteeing the execution of the hard real-time tasks by their deadlines, (ii) Determining the minimum voltage under which each task can be executed, and (iii) Techniques to take advantage of run-time variations in the execution times of tasks. In this research, we present techniques that address the above aspects in single and multi processor embedded systems. We study the performance of the proposed techniques on various benchmarks in terms of energy savings.
Author: Josip Lorincz Publisher: MDPI ISBN: 3039280384 Category : Technology & Engineering Languages : en Pages : 382
Book Description
The book Green, Energy-Efficient and Sustainable Networks provides insights and solutions for a range of problems in the field of obtaining greener, energy-efficient, and sustainable networks. The book contains the outcomes of the Special Issue on “Green, Energy-Efficient and Sustainable Networks” of the Sensors journal. Seventeen high-quality papers published in the Special Issue have been collected and reproduced in this book, demonstrating significant achievements in the field. Among the published papers, one paper is an editorial and one is a review, while the remaining 15 works are research articles. The published papers are self-contained peer-reviewed scientific works that are authored by more than 75 different contributors with both academic and industry backgrounds. The editorial paper gives an introduction to the problem of information and communication technology (ICT) energy consumption and greenhouse gas emissions, presenting the state of the art and future trends in terms of improving the energy-efficiency of wireless networks and data centers, as the major energy consumers in the ICT sector. In addition, the published articles aim to improve energy efficiency in the fields of software-defined networking, Internet of things, machine learning, authentication, energy harvesting, wireless relay systems, routing metrics, wireless sensor networks, device-to-device communications, heterogeneous wireless networks, and image sensing. The last paper is a review that gives a detailed overview of energy-efficiency improvements and methods for the implementation of fifth-generation networks and beyond. This book can serve as a source of information in industrial, teaching, and/or research and development activities. The book is a valuable source of information, since it presents recent advances in different fields related to greening and improving the energy-efficiency and sustainability of those ICTs particularly addressed in this book
Author: Ekram Hossain Publisher: Cambridge University Press ISBN: 1107017548 Category : Technology & Engineering Languages : en Pages : 439
Book Description
Presents state-of-the-art research on green radio communications and networking technology to researchers and professionals working in wireless communication.
Author: Abdallah Shami
Author: Abdallah Shami
Author: Ashima Gupta
Author: Randal Berry
Author: Soham Sarkar
Author: Qi Liu
Author: 李培維
Author: Luís Miguel Borges
Author: Rajesh Babu Prathipati
Author: Josip Lorincz
Author: Ekram Hossain