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Channel Access Scheduling In Ad Hoc Networks With Unidirectional Links
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Book Synopsis Channel Access Scheduling in Ad Hoc Networks with Unidirectional Links by :
Download or read book Channel Access Scheduling in Ad Hoc Networks with Unidirectional Links written by and published by . This book was released on 2001 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new family of collision-free channel access protocols for ad hoc networks with unidirectional links is introduced. These protocols are based on a distributed contention resolution algorithm that operates at each node based on the list of direct contenders (one-hop neighbors or incident links) and indirect interferences (two-hop neighbors and related links). Depending on the activation scheme (node activation or link activation), a network node uses the identifiers of its neighbors one and two hops away to elect deterministically one or multiple winners for channel access in each contention context (e.g., a time slot or a frequency band). The protocols are shown to be fair and capable of achieving maximum utilization of the channel bandwidth. The delay and throughput characteristics of the channel access protocols is studied by simulations.
Book Synopsis Security and Routing in Wireless Networks by : Yang Xiao
Download or read book Security and Routing in Wireless Networks written by Yang Xiao and published by Nova Publishers. This book was released on 2005 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the advance of wireless networks, building reliable and secured network connections is becoming extremely important. On the other hand, ad hoc networks become especially important and have many useful applications. The primary focus of this book is to present these two hot and rapidly evolving areas in wireless networks. Security and scheduling/routing in wireless networks remain challenging research problems due to the complexity involved. How to develop more efficient and reliable wireless networks remains a hot research area. It is this realisation that has motivated the editing of this book. The goal of the book is to serve as a reference for both security in wireless networks and channel access, scheduling, and routing in ad hoc networks. In this book, the authors review important developments and new strategies for these topics. Important features and limitations of methods and models are identified. Consequently, this book can serve as a useful reference for researchers, educators, graduate students, and practitioners in the field of wireless networks. This book contains 14 invited chapters from prominent researchers working in this area around the world. All of the cha
Book Synopsis Hybrid Channel Access Scheduling in Ad Hoc Networks by :
Download or read book Hybrid Channel Access Scheduling in Ad Hoc Networks written by and published by . This book was released on 2002 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the hybrid activation multiple access (HAMA) protocol for ad hoc networks. Unlike previous channel access scheduling protocols that activate either nodes or links only, HAMA is a node-activation channel access protocol that also maximizes the chance of link activations using time- and code-division schemes. HAMA only requires identifiers of the neighbors within two hops from each node to schedule channel access. Using this neighborhood information, each node determines whether to transmit in the current time slot on a dynamically assigned spreading code. A neighbor protocol supplements HAMA with up-to-date two-hop neighborhood information by reliably propagating the one-hop neighbor updates through a novel random access technique. The throughput and delay characteristics of HAMA in randomly-generated multihop wireless networks are studied by analyses and simulations. The results of the analyses show that HAMA achieves higher channel utilization in ad hoc networks than a distributed scheduling scheme based on node activation, similar throughout as a well-known scheduling algorithm based on complete topology information, and much higher throughout than the ideal CSMA and CSMA/CA protocols.
Book Synopsis Topology Control in Wireless Ad Hoc and Sensor Networks by : Paolo Santi
Download or read book Topology Control in Wireless Ad Hoc and Sensor Networks written by Paolo Santi and published by John Wiley & Sons. This book was released on 2005-08-05 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topology control is fundamental to solving scalability and capacity problems in large-scale wireless ad hoc and sensor networks. Forthcoming wireless multi-hop networks such as ad hoc and sensor networks will allow network nodes to control the communication topology by choosing their transmitting ranges. Briefly, topology control (TC) is the art of co-ordinating nodes’ decisions regarding their transmitting ranges, to generate a network with the desired features. Building an optimized network topology helps surpass the prevalent scalability and capacity problems. Topology Control in Wireless Ad Hoc and Sensor Networks makes the case for topology control and provides an exhaustive coverage of TC techniques in wireless ad hoc and sensor networks, considering both stationary networks, to which most of the existing solutions are tailored, and mobile networks. The author introduces a new taxonomy of topology control and gives a full explication of the applications and challenges of this important topic. Topology Control in Wireless Ad Hoc and Sensor Networks: Defines topology control and explains its necessity, considering both stationary and mobile networks. Describes the most representative TC protocols and their performance. Covers the critical transmitting range for stationary and mobile networks, topology optimization problems such as energy efficiency, and distributed topology control. Discusses implementation and ‘open issues’, including realistic models and the effect of multi-hop data traffic. Presents a case study on routing protocol design, to demonstrate how TC can ease the design of cooperative routing protocols. This invaluable text will provide graduate students in Computer Science, Electrical and Computer Engineering, Applied Mathematics and Physics, researchers in the field of ad hoc networking, and professionals in wireless telecoms as well as networking system developers with a single reference resource on topology control.
Book Synopsis Ad-Hoc, Mobile, and Wireless Networks by : Samuel Pierre
Download or read book Ad-Hoc, Mobile, and Wireless Networks written by Samuel Pierre and published by Springer Science & Business Media. This book was released on 2003-09-29 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the Second International Conference on Ad-Hoc Networks and Wireless, ADHOC-NOW 2003, held in Montreal, Canada in October 2003. The 23 revised full papers and 4 revised short papers presented were carefully reviewed and selected from 42 submissions. All current aspects of ad-hoc networking, mobile, wireless, and cooperating communication systems are addressed including network architectures, access control and discovery, multicasting protocols, performance, quality of service, QoS, routing protocols, scalability, security, and self-configuration.
Book Synopsis Neighbor-aware Control in Ad Hoc Networks by : Lichun Luke Bao
Download or read book Neighbor-aware Control in Ad Hoc Networks written by Lichun Luke Bao and published by . This book was released on 2002 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ad hoc networks have very unique features, such as dynamic topologies, relatively limited bandwidth and wireless signal propagation schemes, which present difficult challenges for wireless communication. We propose control mechanisms for channel access scheduling and topology control in ad hoc networks, respectively, which utilize the neighborhood information within two hops to cope with the difficulties of communicating in ad hoc networks. First, we present the neighbor-aware contention resolution (NCR) algorithm, and analyze its generic performance with regard to the contention delay and system throughput. The required neighbor information in NCR for ad hoc networks is acquired through the neighbor protocol, which is based on a random channel access mechanism and a reliable message propagation scheme using retransmissions. Then, four channel access protocols based on NCR are presented, namely NAMA, LAMA, PAMA and HAMA, which correspond to node-, link-, pair- wise- and hybrid-activation multiple access protocols, respectively. These protocols are aimed at ad hoc networks with omnidirectional antennas, and their performance is analyzed. Furthermore, channel access protocols, adapted from NAMA and PAMA, are considered for heterogeneous ad hoc networks that include unidirectional links, which may occur due to power and signal propagation differences between wireless stations.
Book Synopsis Resource Management in Wireless Networking by : Mihaela Cardei
Download or read book Resource Management in Wireless Networking written by Mihaela Cardei and published by Springer Science & Business Media. This book was released on 2006-07-06 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the pattern of the Internet growth in popularity, started in the early 1990s, the current unprecedented expansion of wireless technology promises to have an even greater effect on how people communicate and interact, with considerable socio-economic impact all over the world. The driving force behind this growth is the remarkable progress in component miniaturization, integration, and also devel- ments in waveforms, coding, and communication protocols. Besides established infrastructurebased wireless networks (cellular, WLAN, sat- lite) ad-hoc wireless networks emerge as a new platform for distributed applications and for personal communication in scenarios where deploying infrastructure is not feasible. In ad-hoc wireless networks, each node is capable of forwarding packets on behalf of other nodes, so that multi-hop paths provide end-to-end connectivity. The increased flexibility and mobility of ad-hoc wireless networks are favored for appli- tions in law enforcement, homeland defense and military. In a world where wireless networks become increasingly interoperable with each other and with the high-speed wired Internet, personal communication systems will transform into universal terminals with instant access to variate content and able of handle demanding tasks, such as multimedia and real-time video. With users roaming between networks, and with wide variation in wireless link quality even in a single domain, the communications terminal must continue to provide a level of Quality of Service that is acceptable to the user and conforms to a contracted Service Level Agreement.
Book Synopsis Communications and Networking by : Bo Li
Download or read book Communications and Networking written by Bo Li and published by Springer. This book was released on 2018-03-26 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two-volume set LNICST 236-237 constitutes the post-conference proceedings of the 12th EAI International Conference on Communications and Networking, ChinaCom 2017, held in Xi’an, China, in September 2017. The total of 112 contributions presented in these volumes are carefully reviewed and selected from 178 submissions. The papers are organized in topical sections on wireless communications and networking, satellite and space communications and networking, big data network track, multimedia communications and smart networking, signal processing and communications, network and information security, advances and trends of V2X networks.
Book Synopsis Distributed Dynamic Channel Access Scheduling for Ad Hoc Networks by :
Download or read book Distributed Dynamic Channel Access Scheduling for Ad Hoc Networks written by and published by . This book was released on 2002 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three types of collision-free channel access protocols for ad hoc networks are presented. These protocols are derived from a novel approach to contention resolution that allows contending entities to elect one or multiple winners for channel access in any given contention context (e.g., a time slot) in a distributed fashion. In multihop wireless networks, the only required information for each entity is the identifiers of its neighbors one and two hops away. The new protocols are shown to be fair and capable of achieving maximal utilization of the channel bandwidth. The delay and throughput characteristics of the contention resolution algorithms are analyzed, and the performance of the three types of channel access protocols is studied by simulations and compared with that of optimal static scheduling algorithms.
Book Synopsis Neighbor-Aware Control in Ad Hoc Networks by : Lichun Bao
Download or read book Neighbor-Aware Control in Ad Hoc Networks written by Lichun Bao and published by LAP Lambert Academic Publishing. This book was released on 2010-03 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Practical ad hoc networks have unique challenges, such as constant network topology changes, bandwidth-constrained connections and diverse wireless signal fading scenarios. This book presents the design and evaluation of novel and efficient control mechanisms for channel access scheduling and topology control functions in ad hoc networks. The work is based on the neighbor-aware contention resolution (NCR) algorithm, which use only local neighborhood information to achieve globally consistent decisions, thus applicable to solve various control problems in ad hoc networks that required high control overhead before. First, channel access protocols based on NCR are presented for ad hoc networks with omni-directional antennas, namely NAMA, LAMA, PAMA and HAMA, which correspond to node-, link-, pair-wise- and hybrid-activation multiple access protocols, respectively. Furthermore, the collision-free channel access functions for ad hoc networks that have unidirectional links or directional antennas are presented, which were difficult if not impossible to achieve without NCR. NCR-based topology management that constructs a backbone structure in ad hoc networks is presented as well.
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 A History-based Scheduling Medium Access Protocol for Ad Hoc Networks by : Ye Bao
Download or read book A History-based Scheduling Medium Access Protocol for Ad Hoc Networks written by Ye Bao and published by . This book was released on 2003 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A New Approach to Channel Access Scheduling for Ad Hoc Networks by :
Download or read book A New Approach to Channel Access Scheduling for Ad Hoc Networks written by and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three types of collision-free channel access protocols for ad hoc networks are presented. These protocols are derived from a novel approach to contention resolution that allows each node to elect deterministically one or multiple winners for channel access in a given contention context (e.g., a time slot), given the identifiers of its neighbors one and two hops away. The new protocols are shown to be fair and capable of achieving maximum utilization of the channel bandwidth. The delay and throughput characteristics of the contention resolution algorithms are analyzed, and the performance of the three types of channel access protocols is studied by simulations.
Download or read book Access Networks written by Xiao Jun Hei and published by Springer. This book was released on 2010-02-09 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid growth of the Internet as well as the increasing demand for broadband services, access networks have been receiving growing investments in recent years. This has led to a massive network deployment with the goal of eliminating the ba- width bottleneck between end-users and the network core. Today many diverse te- nologies are being used to provide broadband access to end users. The architecture and performance of the access segment (local loop, wired and wireless access n- works, and even home networks) are getting increasing attention for ensuring quality of service of diverse broadband applications. Moreover, most access lines will no longer terminate on a single device, thus leading to the necessity of having a home network designed for applications that transcend simple Internet access sharing among multiple personal computers and enable multimedia support. Therefore, the access network and its home portion have become a hot investment pool from both a fin- cial as well as a research perspective. The aim of the annual International Conference on Access Networks (AccessNets) is to provide a forum that brings together scientists and researchers from academia as well as managers and engineers from the industry and government organizations to meet and exchange ideas and recent work on all aspects of access networks and how they integrate with their in-home counterparts. After Athens in 2006, Ottawa in 2007, and Las Vegas in 2008, this year AccessNets moved to Asia for the first time.
Book Synopsis Distributed Scheduling in Multihop Ad Hoc Networks by : Yijiang Sun
Download or read book Distributed Scheduling in Multihop Ad Hoc Networks written by Yijiang Sun and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Distributed Scheduling in Multihop Ad Hoc Networks" by Yijiang, Sun, 孫一江, 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. Abstract: Abstract of thesis entitled "Distributed Scheduling in Multihop Ad Hoc Networks" Submitted by Sun Yijiang for the degree of Master of Philosophy at The University of Hong Kong in February 2008 A multihop ad hoc network is a network formed by multiple nodes with- out the aid of any centralized administration, and data traffic is typically forwarded by multiple intermediate nodes before reaching its destination. In this thesis, we focus on improving QoS of end-to-end traffic flows in multihop ad hoc networks through packet transmission scheduling. Our approach was to design a framework in which existing schedul- ingalgorithmsoriginallydesigned forinfrastructure-basedwirelessnetworks could be adapted to multihop ad hoc networks. While infrastructure-based wireless scheduling has been studied extensively and most of the proposed algorithms handle the characteristics of wireless medium in an effective and fairway, ourapproach aimstogeneralizetheadaptationofthese algorithms to ad hoc networks and thus to make maximum use of the existing resource of wireless scheduling. iThe framework consists of two sets of mechanisms. The first one is an end-to-end service compensation mechanism. Each multihop flow is asso- ciated with some QoS requirement, which is requested and granted in the form of the desired service rate. The achieved rate is estimated at the des- tination and fed back to the source periodically. Both the desired rate and achieved rate of a multihop flow are propagated from the source node to all its downstream relaying nodes. With this information, a compensation- capable scheduling algorithm originally designed for infrastructure-based wireless networks can be adapted to each ad hoc node for error compensa- tion. The second part of the framework is a set of mechanisms for distributed opportunistic scheduling in multihop wireless ad hoc networks. The frame- work includes a wireless link state estimation mechanism, a requirement on medium access control protocol and two mechanisms to limit the access of the wireless medium. The link state estimation mechanism provides the necessary status of each wireless link and thus enables the adaptation of various opportunistic scheduling algorithms. The performance ofthe proposed framework was evaluated by computer simulations. Theresultsshowed thattheframeworkcaneffectivelycompen- sate flows that suffer sporadic burst channel errors in an end-to-end fashion and provides robust outcome fairness in the presence of channel errors. (Total number of words: 357) Signed Sun Yijiang ii DOI: 10.5353/th_b3955828 Subjects: Ad hoc networks (Computer networks) Computer algorithms
Book Synopsis Channel Aware Scheduling and Resource Allocation with Cross Layer Optimization in Wireless Networks by : Sheu-Sheu Tan
Download or read book Channel Aware Scheduling and Resource Allocation with Cross Layer Optimization in Wireless Networks written by Sheu-Sheu Tan and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: We develop channel aware scheduling and resource allocation schemes with cross-layer optimization for several problems in multiuser wireless networks. We consider problems of distributed opportunistic scheduling, where multiple users contend to access the same set of channels. Instead of scheduling users to the earliest available idle channels, we also take the instantaneous channel quality into consideration and schedule the users only when the channel quality is sufficiently high. This can lead to significant gains in throughput compared to system where PHY and MAC layers are designed separately and the wireless fading channels are abstracted as time invariant, fixed rate channels for scheduling purposes. We first consider opportunistic spectrum access in a cognitive radio network, where a secondary user (SU) share the spectrum opportunistically with incumbent primary users (PUs). Similar to earlier works on distributed opportunistic scheduling (DOS), we maximize the throughput of SU by formulating the channel access problem as a maximum rate-of-return problem in the optimal stopping theory framework. We show that the optimal channel access strategy is a pure threshold policy, namely the SU decides to use or skip transmission opportunities by comparing the channel qualities to a fixed threshold. We further increase the spectrum utilization by interleaving SU's packets with periodic sensing to detect PU's return. We jointly optimize the rate threshold and the packet transmission time to maximize the average throughput of SU, while limiting interference to PU. Next, we develop channel-aware opportunistic spectrum access strategies in a more general cognitive radio network with multiple SUs. Here, we additionally take into account the collisions and complex interaction between SUs and sharing of resources between them. We derive strategies for both cooperative settings where SUs maximize their sum total of throughputs, as well as non-cooperative game theoretic settings, where each SU tries to maximize its own throughput. We show that the optimal schemes for both scenarios are pure threshold policies. In the non-cooperative case, we establish the existence of Nash equilibrium and develop best response strategies that can converge to equilibria, with SUs relying only on their local observations. We study the trade-off between maximal throughput in the cooperative setting and fairness in the non-cooperative setting, and schemes based on utility functions and pricing that mitigate this tradeoff. In addition to maximizing throughput and fair sharing of resources, it is important to consider network/scheduling delays for QoS performance of delay-sensitive applications. We study DOS under both network-wide and user-specific average delay constraints. We take a stochastic Lagrangian approach and characterize the corresponding optimal scheduling policies accordingly, and show that they have a pure threshold structure. Next, we consider the use of different types of channel quality information, i.e., channel state information (CSI) and channel distribution information (CDI) in the opportunistic scheduling design for MIMO ad hoc networks. CSI is highly dynamic in nature and provides time diversity in the wireless channel, but is difficult to track. CDI offers temporal stability, but is incapable of capturing the instantaneous channel conditions. We design a new class of cross-layer opportunistic channel access scheduling framework for MIMO networks where CDI is used in the network context to group the simultaneous transmission links for spatial channel access and CSI is used in the link context to decide when and which link group should transmit based on a pre designed threshold. We thereby reap the benefits of both the temporal stability of CDI and the time diversity of CSI. Finally, we consider a novel application of cross layer optimization for communication of progressive coded images over OFDM wireless fading channels. We first consider adaptive modulation based on the instantaneous channel state information. An algorithm is proposed to allocate power and constellation size at each subchannel by maximizing the throughput. We next consider both the variance and the average of the throughput when deciding the constellation size for adaptive modulation. Simulation results confirm that cross-layer optimization with adaptive modulation enhances system performance.
Book Synopsis A Protocol for Topology-Dependent Transmission Scheduling in Wireless Networks by :
Download or read book A Protocol for Topology-Dependent Transmission Scheduling in Wireless Networks written by and published by . This book was released on 1999 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new channel access protocol for ad-hoc networks based on topology-dependent transmission scheduling, named collision-avoidance time allocation (CATA), is introduced. CATA allows nodes to contend for and reserve time slots by means of a distributed reservation and handshake mechanism. Contention is limited among nodes within two hops of one another, which provides a very efficient spatial reuse of the bandwidth available. CATA ensures that no collisions occur in successfully reserved time slots, even when hidden terminals exist. Reservations in CATA support unicasting, multicasting and broadcasting simultaneously, and adapt to dynamic service time. The throughput achieved by CATA is analyzed for the case of a fully-connected network topology. Numerical results show that CATA can achieve very high throughput.
