2,921 research outputs found
A study of research trends and issues in wireless ad hoc networks
Ad hoc network enables network creation on the fly without support of any
predefined infrastructure. The spontaneous erection of networks in anytime and
anywhere fashion enables development of various novel applications based on ad
hoc networks. However, at the same ad hoc network presents several new
challenges. Different research proposals have came forward to resolve these
challenges. This chapter provides a survey of current issues, solutions and
research trends in wireless ad hoc network. Even though various surveys are
already available on the topic, rapid developments in recent years call for an
updated account on this topic. The chapter has been organized as follows. In
the first part of the chapter, various ad hoc network's issues arising at
different layers of TCP/IP protocol stack are presented. An overview of
research proposals to address each of these issues is also provided. The second
part of the chapter investigates various emerging models of ad hoc networks,
discusses their distinctive properties and highlights various research issues
arising due to these properties. We specifically provide discussion on ad hoc
grids, ad hoc clouds, wireless mesh networks and cognitive radio ad hoc
networks. The chapter ends with presenting summary of the current research on
ad hoc network, ignored research areas and directions for further research
Resource Management of energy-aware Cognitive Radio Networks and cloud-based Infrastructures
The field of wireless networks has been rapidly developed during the past
decade due to the increasing popularity of the mobile devices. The great demand
for mobility and connectivity makes wireless networking a field whose
continuous technological development is very important as new challenges and
issues are arising. Many scientists and researchers are currently engaged in
developing new approaches and optimization methods in several topics of
wireless networking. This survey paper study works from the following topics:
Cognitive Radio Networks, Interactive Broadcasting, Energy Efficient Networks,
Cloud Computing and Resource Management, Interactive Marketing and
Optimization
Topology Control and Routing in Mobile Ad Hoc Networks with Cognitive Radios
Cognitive radio (CR) technology will have significant impacts on upper layer
performance in mobile ad hoc networks (MANETs). In this paper, we study
topology control and routing in CR-MANETs. We propose a distributed
Prediction-based Cognitive Topology Control (PCTC) scheme to provision
cognition capability to routing in CR-MANETs. PCTC is a midware-like
cross-layer module residing between CR module and routing. The proposed PCTC
scheme uses cognitive link availability prediction, which is aware of the
interference to primary users, to predict the available duration of links in
CR-MANETs. Based on the link prediction, PCTC constructs an efficient and
reliable topology, which is aimed at mitigating re-routing frequency and
improving end-to-end network performance such as throughput and delay.
Simulation results are presented to show the effectiveness of the proposed
scheme
Opportunistic Spectrum Sharing in Dynamic Access Networks: Deployment Challenges, Optimizations, Solutions, and Open Issues
In this paper, we investigate the issue of spectrum assignment in CRNs and
examine various opportunistic spectrum access approaches proposed in the
literature. We provide insight into the efficiency of such approaches and their
ability to attain their design objectives. We discuss the factors that impact
the selection of the appropriate operating channel(s), including the important
interaction between the cognitive linkquality conditions and the time-varying
nature of PRNs. Protocols that consider such interaction are described. We
argue that using best quality channels does not achieve the maximum possible
throughput in CRNs (does not provide the best spectrum utilization). The impact
of guard bands on the design of opportunistic spectrum access protocols is also
investigated. Various complementary techniques and optimization methods are
underlined and discussed, including the utilization of variablewidth spectrum
assignment, resource virtualization, full-duplex capability, cross-layer
design, beamforming and MIMO technology, cooperative communication, network
coding, discontinuousOFDM technology, and software defined radios. Finally, we
highlight several directions for future research in this field
Survey of Important Issues in UAV Communication Networks
Unmanned Aerial Vehicles (UAVs) have enormous potential in the public and
civil domains. These are particularly useful in applications where human lives
would otherwise be endangered. Multi-UAV systems can collaboratively complete
missions more efficiently and economically as compared to single UAV systems.
However, there are many issues to be resolved before effective use of UAVs can
be made to provide stable and reliable context-specific networks. Much of the
work carried out in the areas of Mobile Ad Hoc Networks (MANETs), and Vehicular
Ad Hoc Networks (VANETs) does not address the unique characteristics of the UAV
networks. UAV networks may vary from slow dynamic to dynamic; have intermittent
links and fluid topology. While it is believed that ad hoc mesh network would
be most suitable for UAV networks yet the architecture of multi-UAV networks
has been an understudied area. Software Defined Networking (SDN) could
facilitate flexible deployment and management of new services and help reduce
cost, increase security and availability in networks. Routing demands of UAV
networks go beyond the needs of MANETS and VANETS. Protocols are required that
would adapt to high mobility, dynamic topology, intermittent links, power
constraints and changing link quality. UAVs may fail and the network may get
partitioned making delay and disruption tolerance an important design
consideration. Limited life of the node and dynamicity of the network leads to
the requirement of seamless handovers where researchers are looking at the work
done in the areas of MANETs and VANETs, but the jury is still out. As energy
supply on UAVs is limited, protocols in various layers should contribute
towards greening of the network. This article surveys the work done towards all
of these outstanding issues, relating to this new class of networks, so as to
spur further research in these areas.Comment: arXiv admin note: substantial text overlap with arXiv:1304.3904 by
other author
B.A.T.Mobile: Leveraging Mobility Control Knowledge for Efficient Routing in Mobile Robotic Networks
Efficient routing is one of the key challenges of wireless networking for
unmanned autonomous vehicles (UAVs) due to dynamically changing channel and
network topology characteristics. Various well known mobile-ad-hoc routing
protocols, such as AODV, OLSR and B.A.T.M.A.N. have been proposed to allow for
proactive and reactive routing decisions. In this paper, we present a novel
approach which leverages application layer knowledge derived from mobility
control algorithms guiding the behavior of UAVs to fulfill a dedicated task.
Thereby a prediction of future trajectories of the UAVs can be integrated with
the routing protocol to avoid unexpected route breaks and packet loss. The
proposed extension of the B.A.T.M.A.N. routing protocol by a mobility
prediction component - called B.A.T.Mobile - has shown to be very effective to
realize this concept. The results of in-depth simulation studies show that the
proposed protocol reaches a distinct higher availability compared to the
established approaches and shows robust behavior even in challenging channel
conditions
Information Diffusion issues
In this report there will be a discussion for Information Diffusion. There
will be discussions on what information diffusion is, its key characteristics
and on several other aspects of these kinds of networks. This report will focus
on peer to peer models in information diffusion. There will be discussions on
epidemic model, OSN and other details related to information diffusion.Comment: 7 page
Aeronautical Ad Hoc Networking for the Internet-Above-The-Clouds
The engineering vision of relying on the ``smart sky" for supporting air
traffic and the ``Internet above the clouds" for in-flight entertainment has
become imperative for the future aircraft industry. Aeronautical ad hoc
Networking (AANET) constitutes a compelling concept for providing broadband
communications above clouds by extending the coverage of Air-to-Ground (A2G)
networks to oceanic and remote airspace via autonomous and self-configured
wireless networking amongst commercial passenger airplanes. The AANET concept
may be viewed as a new member of the family of Mobile ad hoc Networks (MANETs)
in action above the clouds. However, AANETs have more dynamic topologies,
larger and more variable geographical network size, stricter security
requirements and more hostile transmission conditions. These specific
characteristics lead to more grave challenges in aircraft mobility modeling,
aeronautical channel modeling and interference mitigation as well as in network
scheduling and routing. This paper provides an overview of AANET solutions by
characterizing the associated scenarios, requirements and challenges.
Explicitly, the research addressing the key techniques of AANETs, such as their
mobility models, network scheduling and routing, security and interference are
reviewed. Furthermore, we also identify the remaining challenges associated
with developing AANETs and present their prospective solutions as well as open
issues. The design framework of AANETs and the key technical issues are
investigated along with some recent research results. Furthermore, a range of
performance metrics optimized in designing AANETs and a number of
representative multi-objective optimization algorithms are outlined
Performance Evaluation of Unicast and Broadcast Mobile Ad hoc Network Routing Protocols
Efficient routing mechanism is a challenging issue for group oriented
computing in Mobile Ad Hoc Networks (MANETs). The ability of MANETs to support
adequate Quality of Service (QoS) for group communication is limited by the
ability of the underlying ad-hoc routing protocols to provide consistent
behavior despite the dynamic properties of mobile computing devices. In MANET
QoS requirements can be quantified in terms of Packet Delivery Ratio (PDR),
Data Latency, Packet Loss Probability, Routing Overhead, Medium Access Control
(MAC) Overhead and Data Throughput etc. This paper presents an in depth study
of one to many and many to many communications in MANETs and provides a
comparative performance evaluation of unicast and broadcast routing protocols.
Dynamic Source Routing protocol (DSR) is used as unicast protocol and BCAST is
used to represent broadcast protocol. The performance differentials are
analyzed using ns2 network simulator varying multicast group size (number of
data senders and data receivers). Both protocols are simulated with identical
traffic loads and mobility models. Simulation result shows that BCAST performs
better than DSR in most cases.Comment: 7 Pages IEEE format, International Journal of Computer Science and
Information Security, IJCSIS January 2010, ISSN 1947 5500,
http://sites.google.com/site/ijcsis
Routing Protocols for Cognitive Radio Networks: A Survey
This article has been withdrawn by arXiv administrators because it
plagiarises http://www2.ece.ohio-state.edu/~ekici/papers/crnroutingsurvey.pdfComment: This article has been withdrawn by arXiv administrators because it
plagiarises http://www2.ece.ohio-state.edu/~ekici/papers/crnroutingsurvey.pd
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