Download or read book Packet Aggregation Based Backpressure Scheduling in Multi hop Wireless Networks written by Gaurish Chandrashekhar Deuskar and published by . This book was released on 2010 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Designing for Network and Service Continuity in Wireless Mesh Networks written by Parth H. Pathak and published by Springer Science & Business Media. This book was released on 2012-11-02 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: “Designing for Network and Service Continuity in Wireless Mesh Networks” describes performance predictability of the new wireless mesh network paradigm, and describes considerations in designing networks from the perspective of survivability and service continuity metrics. The work provides design insights for network design researchers and industry professionals. It includes designs for new mesh networks and extensions of existing networks with predictable performance.
Download or read book Packet Scheduling in Multihop Wireless Networks written by Haiyun Luo and published by . This book was released on 2000 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
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
Download or read book Wireless Scheduling in Multi channel Multi radio Multihop Wireless Networks written by Zhu Wang and published by . This book was released on 2014 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resource Allocation and Routing in Multi hop Wireless Networks written by Yong Ding (Graduate of Michigan State University) and published by . This book was released on 2010 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scheduling Packet Transmissions in a Multi hop Packet Switched Network Based on Message Length written by and published by . This book was released on 1997 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes two algorithms for scheduling packets in a multi-hop network. The objective of the algorithms is to reduce end-to-end message (not packet) transmission delays. Both algorithms schedule packet transmissions based on the length of the original message that the packet belongs to. The first algorithm is preemptive and is based on the shortest-message-first principle and the second is based on the shortest-remaining-transmit-time principle. We develop simulation models for analyzing the algorithms. The simulations show that when message sizes vary widely, these algorithms can significantly reduce average end-to-end message delays compared to First-Come-First-Serve scheduling.
Download or read book Scheduling and Error Control in Cellular and Multi hop Wireless Networks written by Teerawat Issariyakul and published by . This book was released on 2005 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Power Scheduling for Multi hop Wireless Networks written by Yuan Yu and published by . This book was released on 2009 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-hop wireless networks remain an important research frontier of wireless communications. Multi-hop wireless networks are rapidly deployable to extend the coverage of the Internet, which can be an economical alternative to building new base stations. Multi-hop wireless networks are particularly useful for first responders for disaster relief, and military operations in battlefields. In this thesis, we study power scheduling issues for multi-hop wireless networks. Power scheduling, also known as medium access control consisting of link scheduling, power control and source beamforming, fundamentally governs the capacity of multi-hop wireless networks. In the first part of this thesis, the achievable network throughput of large-scale multi-hop wireless networks is evaluated under a power scheduling scheme called opportunistic synchronous array method (O-SAM). Under O-SAM, a large network is partitioned into many small subnets, and within each subnet, the link with best channel gain is scheduled for transmission. We examine the impact of traffic load, network topology and multiple antennas on the achievable network throughput. Compared with slotted ALOHA, the throughput of O-SAM is significantly higher. In addition to O-SAM, a distributed synchronous array method (D-SAM) is proposed, and its performance is also evaluated. In the second part of this thesis, we focus on the power scheduling problem for multi-input multi-output (MIMO) relay networks. A generalized water filling (GWF) theorem is established for link rate maximization with multiple power constraints. The corresponding GWF algorithm is a fast solution to an important class of convex optimization problems. The GWF algorithm is a useful building block for joint source and relay optimization for a multiuser MIMO relay network. We study the power scheduling problems for both uplink and downlink cases of the multiuser MIMO relay network. A number of computational strategies are proposed to maximize the sum rate subject to power constraints or to minimize the sum power subject to rate constraints.
Download or read book Efficient Packet Scheduling in Wireless Multihop Networks written by Xue Yang and published by . This book was released on 2005 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Group Multicast Scheduling Schemes in Multi hop Wireless Networks written by 劉昆[Hsuan] and published by . This book was released on 2012 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fair Packet Scheduling and Bandwidth Management in Wireless Networks written by Ying Jian and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Our study focused on fair packet scheduling and bandwidth management in CSMA/CA based wireless networks. We address the fairness problem for MAC-layer links and study end-to-end service differentiation and rate assurance for multihop flows. Fine-level rate control, particularly meeting rate requirements and differentiating various types of end-to-end traffic, remains an open problem for multihop wireless networks. Traditionally, rate assurance in wired networks is achieved through resource reservation and admission control, which can be efficiently implemented since the bandwidth capacity of each communication link is known and the sender of a link has the information of all flows that compete for the bandwidth of the link. In a wireless network, however, the capacity of each wireless link can change unpredictably over time due to contention from nearby links and dynamic channel conditions. An end-to-end flow consumes available bandwidth not only at links on its route but also at all nearby contending links, which makes resource reservation extremely complicated. We propose a new adaptive rate control function based on two novel techniques, called proportional packet scheduling (PPS) and dynamic weight adaptation with floor and ceiling (DWA). PPS distributes channel bandwidth among MAC (one-hop) flows in proportion to their weights. DWA adapts flows' weight according to their rate requirements and priorities. End-to-end traffic is classified into two categories: best-effort flows and QoS flows with rate requirements. The QoS flows are assigned with different priorities. PPS and DWA together achieve three important objectives without resource reservation and admission control. First, when bandwidth contention arises, the rate requirements of the QoS flows are satisfied in the order of priorities.
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:
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.
Download or read book Transmission Scheduling in Single hop and Multi hop Wireless Networks written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Opportunistic Link Scheduling for Multihop Ad Hoc Wireless Networks written by Min Shen and published by . This book was released on 2007 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
