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Major applications of Vehicular Ad Hoc Networks (VANETs) are strongly related with safety applications like emergency warning, rescue operations, information about road conditions and accident alert. However, little attention has been given to the design of comfort applications with social approach, such as the connecting of people with common interests (like twitter or SMS services). Most of the...
For the low delay requirements of Ad Hoc networks in high traffic-load, it mentioned an improved algorithm named Slotted ALOHA based on Multichannel Statistics (SAMS) . Compared to the widely used protocol of ALOHA, Slotted ALOHA, CSMA and TDMA, the result of SAMS simulation proved it can maintain very low delay of ensuring the high-priority data send successfully in high traffic-load.
The use of beamforming antennas has received significant attention over the last decade. We consider beamforming applied to dynamic operations such as networked UAV hubs which interconnect with users on the ground. The key problem involves scheduling these communications with users serviced by different beam patterns. This paper develops a linear program to optimally allocate time to beams for client...
Delay is a critical QoS performance metric for Multi-hop Wireless Network (MHWN). It is well known that schemes that give a higher data rate to the link with larger queue length can achieve high throughput performance. However, this queue-length-based approach may potentially suffer from large (even infinite) packet delays due to the subsequent contention problem caused by the next-hop arriving packets...
IRDT (Intermittent Receiver-driven Data Transmission) realizes low-power communication between neighbor sensor nodes. This paper proposes combination IRDT-GEDIR of IRDT and GEDIR which is an on-demand location-based ad-hoc routing protocol. Here, for shorter end-to-end transmission delay, pseudo speed of data message transmission is applied for next-hop selection in an intermediate node and on-line...
Mobile ad hoc networks (MANETs) are notoriously difficult to defend against attack. In this paper we demonstrate that by optimizing a previously reported covert timing channel, it is possible to simultaneously improve the reliability of the channel and create a metric that reliably detects attacks. Using standard methods from information theory, we compute the capacity of the covert channel and show...
In this paper, we propose a fast, dynamic slot assignment scheme to reduce timeslot access delay for newly arrived nodes in tactical ad hoc networks. As there is no central coordinator in distributed networks, a newly arrived node in conventional schemes must negotiate separately with each of its neighbors for timeslot allocation. However, it is not necessary to negotiate with all the neighboring...
We investigate the impact of the node-selfishness on the network connectivity and the path delay of information dissemination in large scale Ad-hoc networks based on the percolation theory. A network framework with links obeying stationary process is conceived by combining the effects of both node-selfishness and link qualities. The existence of the node cooperation probability boundary is proved...
In the past decade, multipath routing has been proposed to provide reliability for mobile ad hoc networks (MANETs). As wireless mesh networks become more and more popular, performance evaluation of different routing algorithms is required in static scenarios. Performance comparison between unipath routing and multipath routing is conducted in this paper. From the simulation results we find that multiple...
Serving the most updated version of a resource with minimal networking overhead is always a challenge for WWW Caching, especially, for weak consistency algorithms such as the widely adopted Adaptive Time-to-Live (ATTL). We adopt the Optimal Stopping Theory (OST) and, specifically, the Odds-algorithm, to enable the caching server to accurately handle the object refreshing and the stale delivery problem...
Tactical mobile ad hoc networks have a hierarchical organization with soldiers reporting to their group leader and from them to the command center. In such a network, it is important to prioritize the traffic associated with the leaders without starving other essential communication in the network. To support such a feature, we propose a hybrid routing protocol, named as “Rank-aware Tree-based Geographical...
In order to have the benefits offered by Proactive Routing and Reactive Routing while reducing the undesirable effects of both respectively, Hybrid Routing is suggested to be used in ad-hoc and Mobile Ad-hoc Networks (MANETs). One such hybrid routing protocol is the Zone Routing Protocol (ZRP). ZRP attempts to reduce the initial route discovery delay in case of reactive routing, and the control traffic...
Wireless mesh networks (WMNs) offer dependable and scalable solutions for services utilizing large bandwidth. Enhancement in the deployed number of applications based on wireless mesh networks necessitated a corresponding increased demand for higher bandwidth. This paper proposes a framework for effective management of bandwidth in WMNs making use of the concepts of cross layer design and ant colony...
Wireless Sensor Networks (WSNs) have been regarded as distinguished Ad Hoc networks that can be used for specific applications. Since a WSN consists of potentially hundreds of low cost, small size and battery powered sensor nodes, it has more potentials than other Ad Hoc networks to be deployed in many emerging applications. The WSNs raised many new challenges such as: the design of embedded sensors...
This article mainly describes the Ad hoc on-demand QoS routing based on Bandwidth Prediction (AQBP). Differing from the existing QoS routing protocols, AQBP takes node future bandwidth into consideration when selects route. The future bandwidth requirement of each node is predicted by its history. The performances of throughput, transmission ratio and delay among AODV, AQOR and AQBP have been simulated...
This paper investigates traffic related performance for TCP/UDP-based traffic flows in a MANET powered by OLSR with various routing metrics. Besides the ETX (expected transmission count), an alternative is proposed that resorts on a cross-layer approach to obtain PER (packet error rate) estimates from the physical layer. Throughput and latency performance are evaluated for various configurations of...
We propose a novel position-based routing protocol Anchor-based Connectivity Aware Routing (ACAR) for Vehicular Ad-hoc Networks (VANETs), which considers both buses and cars as vehicular nodes running in both clockwise and anti-clockwise directions. ACAR is a hybrid protocol, uses both the greedy forwarding approach and the carry-store-and-forward approach to ensure the connectivity of the routes...
A cross-layered communication paradigm for integrating search and surveillance applications of Unmanned Aeronautical Ad-Hoc Networks (UAANETs) is proposed. The idea is to accomplish two conflicting applications of UAANETs simultaneously via a single ad-hoc communication architecture. The proposal supports both searching and tracking missions of UAANETs via a unified cross-layer architecture. In order...
The wireless mobile network is a dynamic environment. The characteristics of the wireless mobile communication include limited channel bandwidth, high BER, dynamic change over time, unstable channel quality, mobile node, competition of multiple users to share the channel, and the users' wireless signal interference from other nodes of the shared channel. These characteristics of wireless communication...
Routing protocols design is an important and essential issue for Vehicular Ad Hoc Networks. In this paper, a more realistic simulation environment is developed based on VanetMobiSim and OPNET, and the performance of several classical routing protocols such as Optimized Link State Routing (OLSR), Geographic Routing Protocol (GRP), Ad hoc On Demand Distance Vector Routing (AODV) and Dynamic Source Routing...
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