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Scheduling In Wireless Networks
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Book Synopsis Scheduling in Wireless Networks by : Anna Pantelidou
Download or read book Scheduling in Wireless Networks written by Anna Pantelidou and published by Now Publishers Inc. This book was released on 2011 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the problem of scheduled channel access in wireless networks with emphasis on ad hoc and sensor networks as opposed to WiFi, cellular, and infrastructure-based networks. It is intended to provide a reference point for the rich set of problems that arise in the allocation of resources in modern and future networks.
Book Synopsis Energy-Efficient Scheduling under Delay Constraints for Wireless Networks by : Randal Berry
Download or read book Energy-Efficient Scheduling under Delay Constraints for Wireless Networks written by Randal Berry and published by Springer Nature. This book was released on 2022-05-31 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis On Distributed Scheduling for Wireless Networks with Time-varying Channels by : Akula Aneesh Reddy
Download or read book On Distributed Scheduling for Wireless Networks with Time-varying Channels written by Akula Aneesh Reddy and published by . This book was released on 2013 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless scheduling is a fundamental problem in wireless networks that involves scheduling transmissions of multiple users in order to support data flows with as high rates as possible. This problem was first addressed by Tassuilas and Ephremides, resulting in the celebrated Back-Pressure network scheduling algorithm. This algorithm schedules network links to maximize throughput in an opportunistic fashion using instantaneous network state information (NSI), i.e., queue and channel state knowledge across the entire network. However, the Back-Pressure (BP) algorithm suffers from various drawbacks - (a) it requires knowledge of instantaneous NSI from the whole network, i.e. feedback about time-varying channel and queue states from all links of the network, (b) the algorithm requires solving a global optimization problem at each time to determine the schedule, making it highly centralized. Further, Back-pressure algorithm was originally designed for wireless networks where interference is modeled using protocol interference model. As recent break-throughs in full-duplex communications and interference cancelation techniques provide greatly increased capacity and scheduling flexibility, it is not clear how BP algorithm can be modified to improve the data rates and reduce the delay. In this thesis, we address the drawbacks of Back-Pressure algorithm to some extent. In particular, our first work provides a new scheduling algorithm (similar to BP) that allows users to make individual decisions (distributed) based on heterogeneously delayed network state information (NSI). Regarding the complexity issue, in our second work, we analyze the performance of the greedy version of BP algorithm, known as Greedy Maximal Scheduling (GMS) and understand the effect of channel variations on the performance of GMS. In particular, we characterize the efficiency ratio of GMS in wireless networks with fading. In our third and fourth work, we propose and analyze new scheduling algorithms that can benefit from new advancements in interference cancelation techniques.
Book Synopsis Scheduling and Congestion Control for Wireless and Processing Networks by : Libin Jiang
Download or read book Scheduling and Congestion Control for Wireless and Processing Networks written by Libin Jiang and published by Springer Nature. This book was released on 2022-06-01 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, we consider the problem of achieving the maximum throughput and utility in a class of networks with resource-sharing constraints. This is a classical problem of great importance. In the context of wireless networks, we first propose a fully distributed scheduling algorithm that achieves the maximum throughput. Inspired by CSMA (Carrier Sense Multiple Access), which is widely deployed in today's wireless networks, our algorithm is simple, asynchronous, and easy to implement. Second, using a novel maximal-entropy technique, we combine the CSMA scheduling algorithm with congestion control to approach the maximum utility. Also, we further show that CSMA scheduling is a modular MAC-layer algorithm that can work with other protocols in the transport layer and network layer. Third, for wireless networks where packet collisions are unavoidable, we establish a general analytical model and extend the above algorithms to that case. Stochastic Processing Networks (SPNs) model manufacturing, communication, and service systems. In manufacturing networks, for example, tasks require parts and resources to produce other parts. SPNs are more general than queueing networks and pose novel challenges to throughput-optimum scheduling. We proposes a "deficit maximum weight" (DMW) algorithm to achieve throughput optimality and maximize the net utility of the production in SPNs. Table of Contents: Introduction / Overview / Scheduling in Wireless Networks / Utility Maximization in Wireless Networks / Distributed CSMA Scheduling with Collisions / Stochastic Processing networks
Book Synopsis Scheduling and Congestion Control for Wireless Internet by : Xin Wang
Download or read book Scheduling and Congestion Control for Wireless Internet written by Xin Wang and published by Springer Science & Business Media. This book was released on 2013-07-30 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This brief proposes that the keys to internet cross-layer optimization are the development of non-standard implicit primal-dual solvers for underlying optimization problems, and design of jointly optimal network protocols as decomposition of such solvers. Relying on this novel design-space oriented approach, the author develops joint TCP congestion control and wireless-link scheduling schemes for wireless applications over Internet with centralized and distributed (multi-hop) wireless links. Different from the existing solutions, the proposed schemes can be asynchronously implemented without message passing among network nodes; thus they are readily deployed with current infrastructure. Moreover, global convergence/stability of the proposed schemes to optimal equilibrium is established using the Lyapunov method in the network fluid model. Simulation results are provided to evaluate the proposed schemes in practical networks.
Book Synopsis Scheduling in Wireless Networks with Oblivious Power Assignments by : Alexander Fanghänel
Download or read book Scheduling in Wireless Networks with Oblivious Power Assignments written by Alexander Fanghänel and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2011-12 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies the capacity of multipoint radio networks. One is given a set of requests for connections between pairs of devices. We need to assign each request a time slot and a transmission power such that the requests in each time slot can be scheduled simultaneously. The feasibility of simultaneous communication is defined by the widely accepted SINR interference model. We strive to minimize the time needed to schedule all requests. Our focus lies on algorithms using distance-based power assignments, for which the power of a request relies only on the distance between the devices. Such assignments are inherently local and particularly useful in distributed settings. Our analysis reveals that algorithms applying a clever, nontrivial choice of the transmission powers significantly outperform currently implemented algorithms. We further present good scheduling strategies when restricting to energy-efficient power assignments.
Book Synopsis Scheduling in Wireless Networks with Limited and Imperfect Channel Knowledge by : Wenzhuo Ouyang
Download or read book Scheduling in Wireless Networks with Limited and Imperfect Channel Knowledge written by Wenzhuo Ouyang and published by . This book was released on 2014 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: We model the scheduling problems as Partially Observable Markov Decision Processes (POMDPs). POMDPs are known to be difficult to solve. We are able to analyze the problems in the framework of Restless Multi-armed Bandit Processes and utilize the Whittle's indexability analysis. Based on our analysis, we propose low-complexity scheduling algorithms that have optimality performance in different wireless networks. Our work reveals that, under limited and imperfect channel state information, exploiting channel memory and ARQ-styled feedback for scheduling can result in significant system-level performance gains and that the proposed polynomial-complexity algorithms have provably optimal performances in various settings.
Book Synopsis Scheduling in Multi-Channel Wireless Networks with Limited Information by :
Download or read book Scheduling in Multi-Channel Wireless Networks with Limited Information written by and published by . This book was released on 2008 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The availability of multiple orthogonal channels in a wireless network can potentially lead to substantial performance improvement by alleviating contention and interference. However, this also gives rise to non-trivial channel coordination issues. The situation is exacerbated by variability in the achievable data-rates across channels and links. Thus, scheduling in such networks may require substantial information-exchange and lead to non-negligible overhead. This provides a strong motivation for the study of scheduling algorithms that can operate with limited information, while still providing acceptable worst-case performance guarantees. In this paper, we make an effort in this direction, by examining the scheduling implications of multiple channels, and heterogeneity in channel-rates. We establish lower bounds on performance of a class of maximal schedulers, and describe a scheduler that require limited information-exchange between nodes. We first demonstrate that when the underlying scheduling mechanism is "imperfect", the presence of multiple orthogonal channels can help alleviate the detrimental impact of the imperfect scheduler, and yield a significantly better efficiency-ratio in a wide range of network topologies. We then establish performance bounds for a scheduler than can achieve good efficiency-ratios in the presence of channels with heterogeneous rates without requiring explicit exchange of queue-information. Our results indicate that it may be possible to achieve a desirable trade-off between performance and information.
Book Synopsis Scheduling and Congestion Control for Wireless and Processing Networks by : Libin Jiang
Download or read book Scheduling and Congestion Control for Wireless and Processing Networks written by Libin Jiang and published by Morgan & Claypool Publishers. This book was released on 2010-10-10 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, we consider the problem of achieving the maximum throughput and utility in a class of networks with resource-sharing constraints. This is a classical problem of great importance. In the context of wireless networks, we first propose a fully distributed scheduling algorithm that achieves the maximum throughput. Inspired by CSMA (Carrier Sense Multiple Access), which is widely deployed in today's wireless networks, our algorithm is simple, asynchronous, and easy to implement. Second, using a novel maximal-entropy technique, we combine the CSMA scheduling algorithm with congestion control to approach the maximum utility. Also, we further show that CSMA scheduling is a modular MAC-layer algorithm that can work with other protocols in the transport layer and network layer. Third, for wireless networks where packet collisions are unavoidable, we establish a general analytical model and extend the above algorithms to that case. Stochastic Processing Networks (SPNs) model manufacturing, communication, and service systems. In manufacturing networks, for example, tasks require parts and resources to produce other parts. SPNs are more general than queueing networks and pose novel challenges to throughput-optimum scheduling. We proposes a "deficit maximum weight" (DMW) algorithm to achieve throughput optimality and maximize the net utility of the production in SPNs. Table of Contents: Introduction / Overview / Scheduling in Wireless Networks / Utility Maximization in Wireless Networks / Distributed CSMA Scheduling with Collisions / Stochastic Processing networks
Book Synopsis Personal Wireless Communications by : Robert Bestak
Download or read book Personal Wireless Communications written by Robert Bestak and published by Springer. This book was released on 2007-11-14 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International conference on Personal Wireless Communications (PWC 2007) was the twelfth conference of its series aimed at stimulating technical exchange between researchers, practitioners and students interested in mobile computing and wireless networks. The program covered a variety of research topics that are of current interest, including Ad-Hoc Networks, WiMAX, Heterogeneous Networks, Wireless Networking, QoS and Security, Sensor Networks, Multicast and Signal processing.
Book Synopsis Online Learning for Scheduling in Wireless Networks by : Isfar Tariq
Download or read book Online Learning for Scheduling in Wireless Networks written by Isfar Tariq and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few years, online learning has grown in importance as it allows us to build systems that can interact with the environment while continuously learning from past interactions to improve future decisions to maximize some objective. While online learning is used in several areas like recommendation systems, however, due to the complexity of wireless scheduling it is unclear how to utilize online learning. For instance, MU-MIMO scheduling involves the selection of a user subset and associated rate selection each time-slot for varying channel states (the vector of quantized channels matrices for each of the users) — a complex integer optimization problem that is different for each channel state. We propose that a low-dimensional structure is present in the wireless systems which can be exploited through online learning. For instance, channel-states "near" each other will likely have the same optimal solution. In our first problem, we present a framework through which we formulate the wireless scheduling problem as a multi-armed bandit problem. We then propose an online algorithm that can cluster the channel-states and learn the capacity region of these clusters. We show that our algorithms can significantly reduce the complexity of online learning for wireless settings and provide regret guarantees for our algorithm. In the second problem, we expand on our previous work and present (1) a framework that further exploits the low-dimensional structure present in the system by clustering users and (2) an online algorithm that utilizes the parameters learned by our previous algorithms to optimize the subset of users to be scheduled for given channel-state. We show that our algorithms can not only converge faster but also improve the overall throughput of the system. We also provide regret guarantees for the user clustering algorithm
Book Synopsis Scheduling and Fairness in Multi-hop Wireless Networks by : Ananthapadmanabha Rajagopala-Rao
Download or read book Scheduling and Fairness in Multi-hop Wireless Networks written by Ananthapadmanabha Rajagopala-Rao and published by . This book was released on 2007 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical Foundations of Channel Scheduling in Wireless Networks by : Amrinder Arora
Download or read book Theoretical Foundations of Channel Scheduling in Wireless Networks written by Amrinder Arora and published by . This book was released on 2006 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scheduling Algorithm Design in Multiuser Wireless Networks by : Yi Chen
Download or read book Scheduling Algorithm Design in Multiuser Wireless Networks written by Yi Chen and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, we discuss throughput-optimal scheduling design in multiuser wireless networks. Throughput-optimal scheduling algorithm design in wireless systems with flow-level dynamics is a challenging open problem, especially considering that the majority of the Internet traffic are short-lived TCP controlled flows. In future wireless networks supporting machine-to-machine and human-to-human applications, both short-lived dynamic flows and long-lived persistent flows coexist. How to design the throughput-optimal scheduling algorithm to support dynamic and persistent flows simultaneously is a difficult and important unsolved problem. Our work starts from how to schedule short-lived dynamic flows in wireless systems to achieve throughput-optimality with queue stability. Classic throughput-optimal scheduling algorithms such as the Queue-length based Maxweight scheduling algorithm (QMW) cannot stabilize systems with dynamic flows in practical communication networks. We propose the Head-of-Line (HOL) access delay based scheduling algorithm (HAD) for flow-level dynamic systems, and show that HAD is able to obtain throughput-optimality which is validated by simulation.As the Transmission Control Protocol (TCP) is the dominant flow and congestion control protocol for the Internet nowadays, we turn our attention to the compatibility between throughput-optimal schedulers and TCP. Most of the existing throughput-optimal scheduling algorithms have encountered unfairness problem in supporting TCP-controlled flows, which leads to undesirable network performance. Motivated by this, we first reveal the reason of the unfairness problem, then study the compatibility between HAD and TCP with different channel assumptions, and finally analyze the mean throughput performance of HAD. The result shows that HAD is compatible with TCP.Since the assumption of an infinite buffer size in the existing theoretical analysis of throughput-optimality is not practical, we analyze the queueing behaviour of the proposed throughput-optimal scheduling algorithm to provide useful guidelines for real system design by using the Markov chain analytic model. We propose the analytic model for the queuing and delay performance for the HAD scheduler, and then further develop an approximation approach to reduce the complexity of the model. Finally, we propose a throughput-optimal scheduling algorithm for hybrid wireless systems with the coexistence of persistent and dynamic flows. Then, to generalize the throughput-optimal scheduling, the control function in the scheduling rule is extended from a specific one to a class of functions, so that the scheduling design can be more flexible to make a tradeoff between delay, fairness, etc. We show that the hybrid wireless networks with coexisting persistent flows and dynamic flows can be stabilized by our proposed scheduling algorithm which can obtain throughput-optimality.In summary, we solve the challenging problem of designing throughput-optimal scheduling algorithm in wireless systems with flow-level dynamics. Then we show that our algorithm can support TCP regulated flows much better than the existing throughput-optimal schedulers. We further analyze the queueing behaviour of the proposed algorithm without the assumption of infinite buffer size that is often used in the throughput-optimality analysis in the literature, and the result provides a guideline for the implementation of our algorithm. At last, we generalize the proposed scheduling algorithm to support different types of flows simultaneously in practical wireless networks.
Book Synopsis Topology-Transparent Distributed Scheduling in Wireless Networks by : Qiong Sun
Download or read book Topology-Transparent Distributed Scheduling in Wireless Networks written by Qiong Sun and published by . This book was released on 2017-01-24 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Topology-transparent Distributed Scheduling in Wireless Networks" by Qiong, Sun, 孙琼, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b4490410 Subjects: Data transmission systems Scheduling Wireless communication systems Algorithms
Book Synopsis Multimedia Traffic Scheduling in Future Wireless Networks by : Ahmed Khattab
Download or read book Multimedia Traffic Scheduling in Future Wireless Networks written by Ahmed Khattab and published by LAP Lambert Academic Publishing. This book was released on 2011-11 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing delay guarantees to time-sensitive multimedia traffic in future wireless networks is a challenging problem. This is due to the time-varying link capacities and the variety of real-time applications expected to be handled by such networks. Multiuser diversity schemes that exploit the variations in the users' channel conditions offer orders of magnitude increase in the performance of wireless systems. This book addresses the problem of channel-aware scheduling of delay bounded traffic for two different wireless network models: Time Division Multiple Access (TDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) broadband wireless networks. A unique feature of this work is the explicit provisioning of statistical QoS while enhancing fairness in data rates, delay bounds, and delay bound violations. We provide extensive simulation results to show the different performance aspects of the proposed schemes.
Book Synopsis Low Complexity Scheduling in Wireless Networks by : Arun Sridharan
Download or read book Low Complexity Scheduling in Wireless Networks written by Arun Sridharan and published by . This book was released on 2013 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thus, the central theme of the dissertation is that by adopting an appropriate choice of algorithm and cross-layer design, the performance guarantees of greedy algorithms can be extended to network models that capture a wide variety of physical layer scenarios.
