2,526 research outputs found
Performance Analysis of Location Profile Routing
We propose using the predictability of human motion to eliminate the overhead
of distributed location services in human-carried MANETs, dubbing the technique
location profile routing. This method outperforms the Geographic Hashing
Location Service when nodes change locations 2x more frequently than they
initiate connections (e.g., start new TCP streams), as in applications like
text- and instant-messaging. Prior characterizations of human mobility are used
to show that location profile routing achieves a 93% delivery ratio with a
1.75x first-packet latency increase relative to an oracle location service
VANET Routing Protocols: Pros and Cons
VANET (Vehicular Ad-hoc Network) is a new technology which has taken enormous
attention in the recent years. Due to rapid topology changing and frequent
disconnection makes it difficult to design an efficient routing protocol for
routing data among vehicles, called V2V or vehicle to vehicle communication and
vehicle to road side infrastructure, called V2I. The existing routing protocols
for VANET are not efficient to meet every traffic scenarios. Thus design of an
efficient routing protocol has taken significant attention. So, it is very
necessary to identify the pros and cons of routing protocols which can be used
for further improvement or development of any new routing protocol. This paper
presents the pros and cons of VANET routing protocols for inter vehicle
communication
Behavior of Wireless Body-to-Body Networks Routing Strategies for Public Protection and Disaster Relief
Critical and public safety operations require real-time data transfer from
the incident area(s) to the distant operations command center going through the
evacuation and medical support areas. Any delay in communication may cause
significant loss. In some cases, it is anticipated that the existing
communication infrastructures can be damaged or out-of-service. It is thus
required to deploy tactical ad-hoc networks to cover the operation zones.
Routing data over the deployed network is a significant challenge with
consideration to the operations conditions. In this paper we evaluate the
performance of mutli-hop routing protocols while using different wireless
technologies in an urban critical and emergency scenario. Using a realistic
mobility model, Mobile Ad hoc, geographic based and data-centric routing
protocols are evaluated with different communication technologies (i.e. WiFi
IEEE 802.11; WSN IEEE 802.15.4; WBAN IEEE 802.15.6). It is concluded that, WiFi
IEEE 802.11 is the best wireless technology with consideration to the packet
reception rate and the energy consumption. Whereas, in terms of delay, WBAN
IEEE 802.15.6 is the most efficient. With regards to the routing protocols,
assuming that the location information is available, geographical based routing
protocol with WiFi IEEE 802.11 performed much better compared to the others
routing protocols. In case where the location information is unavailable,
gradient based routing protocol with WBAN IEEE 802.15.6 seems the best
combination.Comment: WiMob, Oct 2015, Abu Dhabi, United Arab Emirate
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
Geographic routing protocols for underwater wireless sensor networks:a survey
Underwater wireless sensor networks (UWSN), similar to the terrestrial sensor
networks, have different challenges such as limited bandwidth, low battery
power, defective underwater channels, and high variable propagation delay. A
crucial problem in UWSN is finding an efficient route between a source and a
destination. Consequently, great efforts have been made for designing efficient
protocols while considering the unique characteristics of underwater
communication. Several routing protocols are proposed for this issue and can be
classified into geographic and non-geographic routing protocols. In this paper
we focus on the geographic routing protocols. We introduce a review and
comparison of different algorithms proposed recently in the literature. We also
presented a novel taxonomy of these routing in which the protocols are
classified into three categories (greedy, restricted directional flooding and
hierarchical) according to their forwarding strategies.Comment: 19 pages, IJWMN journa
CoopGeo: A Beaconless Geographic Cross-Layer Protocol for Cooperative Wireless Ad Hoc Networks
Cooperative relaying has been proposed as a promising transmission technique
that effectively creates spatial diversity through the cooperation among
spatially distributed nodes. However, to achieve efficient communications while
gaining full benefits from cooperation, more interactions at higher protocol
layers, particularly the MAC (Medium Access Control) and network layers, are
vitally required. This is ignored in most existing articles that mainly focus
on physical (PHY)-layer relaying techniques. In this paper, we propose a novel
cross-layer framework involving two levels of joint design---a MAC-network
cross-layer design for forwarder selection (or termed routing) and a MAC-PHY
for relay selection---over symbol-wise varying channels. Based on location
knowledge and contention processes, the proposed cross-layer protocol, CoopGeo,
aims at providing an efficient, distributed approach to select next hops and
optimal relays along a communication path. Simulation results demonstrate that
CoopGeo not only operates properly with varying densities of nodes, but
performs significantly better than the existing protocol BOSS in terms of
packet error rate, transmission error probability, and saturated throughput
Density-aware Dynamic Mobile Networks: Opportunities and Challenges
We experience a major paradigm change in mobile networks. The infrastructure
of cellular networks becomes mobile as it is densified by using mobile and
nomadic small cells to increase coverage and capacity. Furthermore, the
innovative approaches such as green operation through sleep scheduling,
user-controlled small cells, and end-to-end slicing will make the network
highly dynamic. Mobile cells, while bringing many benefits, introduce many
unconventional challenges that we present in this paper. We have to introduce
novel techniques for adapting network functions, communication protocols and
their parameters to network density. Especially when cells on wheels or wings
are considered, static and man-made configurations will waste valuable
resources such as spectrum or energy if density is not considered as an
optimization parameter. In this paper, we present the existing density
estimators. We analyze the impact of density on coverage, interference,
mobility management, scalability, capacity, caching, routing protocols and
energy consumption. We evaluate nomadic cells in dynamic networks in a
comprehensive way and illustrate the potential objectives we can achieve by
adapting mobile networks to base station density. The main challenges we may
face by employing dynamic networks and how we can tackle these problems are
discussed in detail
Rendezvous Regions: A Scalable Architecture for Resource Discovery and Service Location in Large-Scale Mobile Networks
In large-scale wireless networks such as mobile ad hoc and sensor networks,
efficient and robust service discovery and data-access mechanisms are both
essential and challenging. Rendezvous-based mechanisms provide a valuable
solution for provisioning a wide range of services. In this paper, we describe
Rendezvous Regions (RRs) - a novel scalable rendezvous-based architecture for
wireless networks. RR is a general architecture proposed for service location
and bootstrapping in ad hoc networks, in addition to data-centric storage,
configuration, and task assignment in sensor networks. In RR the network
topology is divided into geographical regions, where each region is responsible
for a set of keys representing the services or data of interest. Each key is
mapped to a region based on a hash-table-like mapping scheme. A few elected
nodes inside each region are responsible for maintaining the mapped
information. The service or data provider stores the information in the
corresponding region and the seekers retrieve it from there. We run extensive
detailed simulations, and high-level simulations and analysis, to investigate
the design space, and study the architecture in various environments including
node mobility and failures. We evaluate it against other approaches to identify
its merits and limitations. The results show high success rate and low overhead
even with dynamics. RR scales to large number of nodes and is highly robust and
efficient to node failures. It is also robust to node mobility and location
inaccuracy with a significant advantage over point-based rendezvous mechanisms
GrLS : group-based location service in mobile ad hoc networks
2006-2007 > Academic research: refereed > Refereed conference paperVersion of RecordPublishe
A Comparative Study of Various Routing Protocols in VANET
Vehicular Ad Hoc Networks (VANET) is a subclass of Mobile ad hoc networks
which provides a distinguished approach for Intelligent Transport System (ITS).
The survey of routing protocols in VANET is important and necessary for smart
ITS. This paper discusses the advantages / disadvantages and the applications
of various routing protocols for vehicular ad hoc networks. It explores the
motivation behind the designed, and traces the evolution of these routing
protocols. F inally the paper concludes by a tabular comparison of the various
routing protocols for VANET.Comment: 6 pages, 1 figure and 2 table
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