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In this paper, an improved AODV - PWAODV (Piggyback and Weighted neighbor stability Ad hoc On-demand Distance Vector routing) protocol with lower route cost and smaller delay is presented. In the algorithm we introduce a piggyback mechanism and weighted neighbor stability algorithm. Essentially, the route cost can be reduced greatly by the use of piggyback mechanism and the link stability algorithm...
The inherent uncertainty in wireless mobile ad hoc networks (MANET), due to nodal mobility, unstable links, and limited resources, frequently renders routing paths unusable. Due to the unpredictable movement of mobile nodes, the network topology of a mobile ad hoc network changes frequently. It will directly cause the routes to be broken and greatly degrade the network performance. However, selecting...
Geographic forwarding has been widely studied as a routing strategy for mobile ad hoc networks, mainly due to the low complexity, scalability of the routing algorithm. However, in a network with routing holes, existing geographic routing schemes such as GPSR, GOAFR could cause the throughput capacity to drop significantly due to concentration of traffic on the face of the holes. The slope-based stateless...
IEEE 802.15.4 is the emerging next generation wireless standard designed for low-rate wireless personal area networks (LR-WPAN), which suit wireless sensor networks applications. It attempts to provide a low cost, low power and short range wireless networking. The QoS is more challenging in heterogeneous wireless sensors networks, where a diverse mixture of sensors for monitoring temperature, pressure,...
Flow convergence on particular nodes causes various problems such as degradation in QoS. We describe a new routing method for reducing the maximum number of relay flows on the node that relays maximum flows (called “the maximum number of relay flows”). A full search is required for calculating the optimal algorithm of this problem. Thus, we created an approximate algorithm to calculate a near optimal...
Message Ferrying (MF) is a recently proposed scheme to restore a Mobile Ad Hoc Network (MANET) from partitioning. Despite of the effectiveness in partition restoration, it sometimes suffers from long delay caused by the poor design of ferry route. The Message Ferry Route (MFR) problem has earlier been studied to minimize this drawback of MF schemes. In this paper, we argue that a dynamic way of determining...
In this paper, we propose an energy-balanced cross-layer multi-path routing algorithm for wireless Ad hoc networks. This algorithm utilizes cross-layer information of the network nodes and can balance the energy consumption of the network nodes in flow distribution under the situation that the network topology is maintained unchanged; moreover, the transmission power can be adjusted in routing process...
Beaconless georouting algorithms are fully reactive and work without prior knowledge of their neighbors. However, existing approaches can either not guarantee delivery or they require the exchange of complete neighborhood information. We describe two general methods for completely reactive face routing with guaranteed delivery. The beaconless forwarder planarization (BFP) scheme determines correct...
It is possible to provide applications for life-saving and traffic control on VANET in which characteristic of high mobility and extreme topology changes is shown. And greedy-forwarding strategy that is one of the position-based routing schemes cause inefficient path forwarding and frequent transmission failure. Thus, we propose efficient routing scheme using circular node to provide service registration...
The topology of a delay tolerant network (DTN) over time has been modeled by a space-time graph. However, the mobility of nodes, such as buses, may not be completely predictable due to factors such as traffic load, road condition, the number of passengers getting on and off the buses, and the operations of traffic lights. In this paper, we adapt the space-time graph by augmenting each horizontal edge...
In a mobile ad hoc network, where nodes are deployed without any wired infrastructure and communicate via multihop wireless links, the network topology is based on the nodes' locations and transmission ranges. The nodes communicate through wireless links, with each node acting as a relay when necessary to allow multihop communications. The network topology can have a major impact on network performance...
One of the notoriously difficult problems in vehicular ad-hoc networks is to ensure that established paths do not break before the end of data transmission. This is a difficult problem because the network topology is changing constantly and the routing links are inherently unstable. Inspired by ticket based probing, we propose a scheme to selects a stable routing path in vehicular network environment...
This paper considers the problem of routing packets across a multi-hop wireless network while ensuring throughput optimality. One of the main challenges in the design of throughput optimal routing policies is identifying appropriate and universal Lyapunov functions with negative expected drift. The few well-known throughput optimal routing policies in the literature are constructed using simple quadratic...
Due to the dynamic nature of the network topology and restricted resources, quality of service (QoS) and stability routing in mobile ad hoc network (MANET) is a challenging task. This paper presents fuzzy controllers based QoS routing algorithm (FQRA). The performance of this scheduler is studied using NS2 and evaluated in terms of quantitative metrics such as path success ratio, average end-to-end...
Delay Tolerant Networks (DTNs), in which contacts between nodes come and go over time, is a promising approach to model communications in mobile ad-hoc networks, where scenarios of network partitioning and node disconnections are likely to happen. One of the most important challenges in such networks is how to route information and schedule transmissions, coping with the continuously changing network...
Wireless ad hoc networks consist of nodes which can communicate with each other in a peer-to-peer fashion over single hop or multi hops without any fixed infrastructure such as access point or base station. In flat topology there is no topology management concept and all the nodes participate in routing. In this paper the task of topology management for ad hoc networks is implemented using routing...
Host resources (e.g., CPU time and buffer space) in mobile ad hoc networks must be shared between the devices own applications and networking functions, such as routing and packet forwarding on behalf of remote nodes. Previous work has ignored the performance conflicts that arise due to the need to share host resources. In this work, using both analytical and statistical-based empirical analysis,...
Information and network communications play a vital role in the everyday operations of the United States Armed Forces. As the Department of Defense moves more toward net-centric warfare, this role will only increase. Traditional work in mobile ad-hoc networks (MANETs) assumes there is no knowledge available about mobility patterns or communication traffic over time. However, this is generally not...
The wireless mesh network (WMN) is a novel wireless network architecture that puts several wireless routers into wireless ad hoc networks for mobile nodes to access the Internet. Due to the similarity in network topology between WMN and the Mobile ad hoc network (MANET), the routing algorithm from MANET can be adopted to WMN. Traditionally, the routing algorithms in MANET choose the shortest route...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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