This website uses cookies to ensure you have the best experience. Learn more

Backpressure Based Adaptive Routing And Scheduling In Delay Tolerant Network

728 words - 3 pages

Under high traffic conditions, this works very well, and backpressure is able to fully utilize the available network resources in a highly dynamic fashion. Under low traffic conditions, however, because many other nodes may also have a small or 0 queue size, there is inefficiency in terms of an increase in delay, as packets may loop or take a long time to make their way to the destination. This is particularly of concern in intermittent encounter-based mobile networks which are already delay-limited due to the sparse and highly dynamic network connectivity. Such networks have proposed the use of redundant transmissions to improve delay, which do not work well when the traffic load is high.

Routing protocol, such as Spray and Wait, that advocate the use of redundant transmissions, to make additional copies of the communicated information in the network. The replication of the content makes it faster for the destination to access a copy. However, as the additional replication always increases the network load, these protocols, which are not throughput-optimal to, suffers additional congestion. Hence wemove to an adaptive redundancy technique for backpressure routing, that yields the benefits of replication to reduce delay under low load conditions, while at the same time preserving the performance and benefits of traditional backpressure routing under high traffic conditions. This technique, which we refer to as backpressure with adaptive redundancy (BWAR), essentially creates copies of packets in a new duplicate buffer upon an encounter, when the transmitter’s queue occupancy is low. These duplicate packets are transmitted only when the original queue is empty.

This mechanism can dramatically improve delay of backpressure during lowload conditions due to two reasons:
(1) Due tothe existence of multiple copies of the same packets at multiple nodes, the destination is more likely to encounter a massage intended for it.
(2) This way, the algorithm builds up gradients towards the destinations faster and reduces packet looping.

The additional transmissions incurred by BWAR due to the duplicates utilize available slots which would otherwise go idle, in order to reduce the delay. Particularly for networks that are not energy-limited, this offers a more efficient way to utilize...

Find Another Essay On Backpressure Based Adaptive Routing and Scheduling In Delay Tolerant Network

Hydrogen Vehicles and Their Delay in Production

982 words - 4 pages of now, the negative is outweighing the positive. There are three main reasons for the delay in mass-production of hydrogen vehicles; the cost of the vehicle, the ability to refuel and storing the hydrogen. First, as of now, the vehicles are very expensive. The cost of developing hydrogen technology is high. GM, Toyota, Honda, Hyundai and Daimler all have hydrogen fuel research programs, none is close enough to announcing a price. With

Indecision, Hesitation and Delay in Shakespeare's Hamlet - Excessive Hesitation and Delay?

2913 words - 12 pages )   Is there a connection between verbal hesitation and hesitation in action and decisions? Lawrence Danson in the essay “Tragic Alphabet” discusses the hesitation in action by the hero; this is related to his hesitation in speech:   To speak or act in a world where all speech and action are equivocal seeming is, for Hamlet, both perilous and demeaning, a kind of whoring. The whole vexed question of Hamlet’s delay ought, I

A Cross-Layer Adaptive Modulation and Coding Scheme for realistic OFDMA-based Systems

2615 words - 10 pages A Cross-Layer Adaptive Modulation and Coding Scheme for realistic OFDMA-based Systems Abstract—In this letter, we investigate Adaptive Modulation and Coding schemes (AMC) in fast mobility environment with realistic conditions. We argue that feedback Channel State Information (CSI) are outdated and suffer estimation errors for most mobile channels especially fast users. Therefore, ignoring such conditions in AMC scheme design can be

Indecision, Hesitation and Delay in Shakespeare's Hamlet - Procrastination and Indecision

1840 words - 7 pages demeaning, a kind of whoring. The whole vexed question of Hamlet’s delay ought, I believe, to be considered in light of this dilemma. To a man alienated from his society’s most basic symbolic modes, who finds all speech and action mere seeming and hypocritical playing, comes an imperious demand to speak and act – to express himself in deed his father’s son. The ghost’s stress upon ritual modes indicates that the expression demanded must not

Talks about the levels of religion (Tolerant and intolerant)that were found in North America before 1700)

535 words - 2 pages were looked down on by the Puritan society, The Puritans wanted to reform and purify traditional Catholicism. Thus, they turned away from and punished tolerant ideas of religious liberty.Quakers were nearly completely opposite of the Puritans. In 1676 the English Quakers bought proprietary rights to a western part of New Jersey. They developed ith into a haven for the Society of Friends, a group that the Puritans rejected. The Quakers were devoted

The Delay of Development in Guyana and Getting Rid of Class Association

1035 words - 5 pages As mentioned in the first chapter , Guyana’s development is extremely important. As of right now Guyana is the only former British country that has not reached its full potential. The constrains on development in Guyana is based on geography, infrastructure and international markets. All of these constraints mentioned are very true but how do we get rid of class association. Well , we cannot get rid of class association but we can try to get

Software development methodology to improve planning and scheduling in web development

1056 words - 5 pages Software development methodology to improve planning and scheduling in web development. Introduction Now a days Software is an essential part of the modern society. Most of the business companies, government, organizations using IT systems in their operations. But most of the information system projects frequently fail because of the failure to meet the user requirements, insufficient budget, poor communication, poor planning and scheduling

Time and Relative Diversions in Scheduling Work: An Exploration of A Lecturer’s Workload Management

2284 words - 10 pages educational research to further inform and improve my practice. However, in actuality, the paper represents my struggle to improve my understanding and management of all aspects of my professional practice. The paper will start by presenting an overview of action research, its background and history and various models of action research. The paper will then move on to discuss the action research inquiry I conducted before concluding with reflections

An approach of Energy Efficient and secure data transfer using multicast routing protocol in Ad Hoc Networks

946 words - 4 pages protocol is categorized into two schemes: tree based multicast routing protocol and mesh based multicast routing protocol. Figure 1: Classification of Multicast Routing Protocol Tree based multicast routing protocol is based on how to distribute the paths among the group members in multicast network. Its further divided into two types. Shortest-tree based multicast routing protocol and core-tree based multicast routing protocol. The

Social Network and its Impact in America

2019 words - 9 pages District describes, “We connected our classes for a writing activity. We co-taught a lesson to both classes based on the idea of digital storytelling. By the time our kids were done…they eagerly read their stories to an authentic audience in another location. The loved it, and we were hooked” (Childers 10). Not only are social networks providing an educational aspect to schools, but they are making classes more enjoyable as well. Additionally

An Approach of Energy Efficient and Secure Data Transfer Using Multicast Routing Protocol in Ad Hoc Networks

585 words - 3 pages directly with each other and without the aid of access point, and therefore have no fixed infrastructure. A goal of MANET is to broaden mobility into the area of autonomous, mobile and wireless domains, whereas a set of nodes from the network routing infrastructure in an ad-hoc manner. They form an arbitrary topology, where the routers are free to move randomly and arrange themselves as required. Each node or mobile device is equipped with a

Similar Essays

Knowledge Based Expert System In Transportation Engineering And Traffic Adaptive Signal Control System

1462 words - 6 pages Knowledge Based Expert System in Transportation Engineering and Traffic Adaptive Signal Control System I. Abstract Advances in computer technologies have been changing transportation field. Based on those, Intelligent Transportation System has been proposed and being developed for the next generation transportation system. This system requires more utilization of Artificial Intelligence, such as Knowledge Based Expert System, than current

Stable And Self Adaptive Routing For Mobile Ad Hoc Networks Using Cross Layer Design

2857 words - 12 pages may incur delay to initiate the communication, but does not degrade the overall performance of the routing protocol and hence the network performance. This initial delay is due to metric computations involved in route discovery, at the same time identifies a stable and reliable route. In this work the pause time is considered to be constant, and hence the further enhancements to this work is to test the same methodology with the varying pause time

Scalability And Consistency In Peer To Peer Based Network Gaming

2012 words - 8 pages -peer model as it allows for scalability at a lower cost to the vendor. The peer-to-peer model uses connectivity between participants in a network and their cumulative bandwidth rather than conventional centralized resources. It does not have the notion of clients or servers, but only equal peer nodes that simultaneously function as both clients and servers to the other nodes on the network. They are well known for their use in file sharing networks

Indecision, Hesitation And Delay In Shakespeare's Hamlet

2233 words - 9 pages . Ultimately, proves to be one of his greatest flaws and weaknesses as a character. With Hamlet’s tragic flaw being his inability to act, he is plagued throughout the play by his immense intelligence and philosophical nature, which causes him to overanalyze each situation, rendering him unable to carry out any action in response. This is evident in the play by the frequent delay of acting out his father’s revenge due to the uncertainty of the evidence