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A Mobile Ad hoc Network is a self-organized network. The nodes which are within its radio range can have a direct communication if not it use an intermediate node for transmitting data. In MANET the nodes are wireless and fully distributed but they do not have any fixed infrastructure like base station or access points. MANET is a dynamic topology that is in this type of network the nodes will move...
In mobile ad hoc networks, each node can communicate with disconnected nodes by multi-hop transmission. In wireless communication, flame transmission failures occasionally occur due to obstacle, radio wave interference, moving of node, and so on. In IEEE802.11 MAC, a retransmission process is executed when such a failure occurs. However, there is a possibility that retransmissions continuously fail...
Effective communication is a main safeguard in nuclear power plants, so it is necessary to provide useful communication mode under all kinds of circumstances and events. In this case, Mobile Ad Hoc network is introduced to achieve the goal. In the paper, unidirectional link which appear massively in Mobile Ad Hoc Network under nuclear power plants is studied. After the analyses of the causation and...
In this paper, the performances of FSR wireless routing protocol under different parameters are simulated based on ns2 network simulation platform. The reference point group mobility model is selected as the mobile ad hoc network mobility model. Through the detailed analysis of the results, the three features of the FSR routing protocol in terms of end-to-end delay, packet delivery ratio and routing...
An ad-hoc network comprises of mobile nodes that cooperate with each other using wireless connections to route both data and control packets within the network. They are characterized by the use of wireless links, dynamically changing topology, multi-hop connectivity and decentralized routing mechanism and decision-making. The performance of Ad-hoc On Demand Vector (AODV) protocols has been modified...
The area of mobile ad hoc networking has gained widespread interest of the network research community in recent years because of the ability of the MANETs to provide truly distributed and decentralized communication facility on ad hoc basis. But due to the bandwidth constrained links and limited transmission range of the mobile nodes, MANETs suffer from the inability to cover a wider network area...
Routing delivery is one of the key techniques in mobile ad hoc network, which involves many aspects such as topology update, routing exchange and so on. In this paper, we firstly apply routing tree to describe the complete topology of ad hoc network, and then store the information of routing tree into every node's routing table. Sparse routing tree, as a pruned tree, is used to exchange topology information,...
DYMO as a routing protocol is newly intended for use by mobile nodes in wireless multihop network. It offers adaptation to changing network topology and determines unicast routes between nodes within the network on-demand. It is designed for MANET (Mobile Ad hoc Network) in small, medium, and large node populations. It handles all mobility ranges and various traffic patterns. It is simulated using...
To solve the collaboration issues between wireless Ad Hoc networks and Overlay Network, an Ad Hoc overlay network model was presented and a Key-based Indexing Mechanism (KIM) was proposed accordingly, based on the distributed algorithm of Overlay Network and mobile node local routing algorithm. The mechanism combines protocol of Overlay Network in Logical namespace with routing protocol of mobile...
We investigate the channel formation in a Mobile Ad Hoc Network (MANET) using the NS-2 simulator. The results show that the normalized node density is a good measure for predicting the performance of a MANET: for the normalized node density of 2.8 two nodes in a MANET running the AODV routing protocol stay connected 90% of the time. For the DSR protocol this is only 70%. The results may be used in...
Mobile Ad Hoc Network (MANET) is a type of network with special characteristics and it needs special mechanism to bear with its ad hoc behavior. The important issue in MANET is routing protocol. Routing protocol is a standard used to determine the route path taken during the transmission of data. In this paper we will focus on Ad Hoc On Demand Distance Vector (AODV) routing protocol. The simulation...
Due to the mobility of the nodes, finding routes in a wireless mobile ad hoc network is quite a challenging task, and takes up a lot of system resources such as bandwidth and battery power. Although it would be wise to take full advantage of the already discovered paths, many algorithms simply discard the paths if their topology has changed. To overcome this shortcoming, we have proposed a routing...
In this paper we discuss and propose Optimized Link state Routing Protocol with reliability check function. This protocol is based on the link state algorithm such as Open Shortest Path First Routing Protocol. But it has a better advantage than OSPF routing protocols. OLSR has MPR to manage the flood message. It can reduce the flooding message significantly. But it has some flaws in the Mobile Ad...
A mobile ad hoc network is a wireless network without any fixed infrastructure or centralized control. Due to the infrastructure-less mode of operation, mobile ad-hoc networks are gaining popularity. In order to cover a wider area with less fixed infrastructure, sometimes the ad hoc network may be combined with a wired one to form a hybrid network. In such a combined network, in order to transfer...
When the mobile ad hoc network (MANET) is connected to the Internet, it is important for the mobile nodes to detect available Internet gateway (IGW) providing access to the Internet. We propose a new approach of IGW discovery and selection for MANET to connect with Internet. In the scheme, the multi-path is used to find all paths to IGW by source node in MANET, and multi-metric is used to select the...
A Mobile Ad hoc NETwork (MANET) is composed of a set of wireless mobile devices that are able to communicate with each other in a peer-to-peer mode. In recent years video streaming over MANETs has drawn significant attention due to the popularity of high-speed IEEE 802.11 standard series. However, it is still a challenging task for channel variation and bandwidth limitation and fluctuation. In this...
A mobile ad hoc network (MANET) is composed of a set of wireless mobile devices that are able to communicate with each other in a peer-to-peer mode. In recent years video streaming over MANETs has drawn significant attention due to the popularity of high-speed IEEE 802.11 standard series. However, it is still a challenging task for channel variation and bandwidth limitation and fluctuation. In this...
Video transmission over wireless ad hoc networks is very sensitive to temporal dynamics of the wireless channel. In order to achieve good end to end performance, it is necessary for upper layers to quickly adapt to the variations of the wireless links. Based on this motivation, we propose a novel cross layer design (CLD) which employs an adaptive link estimator to ensure reliable transmissions. The...
Multicast routing paths in ODMRP form a multiple tree in fact and different process of multiple tree construction will result in significant different performance in terms of packet delivery ratio, forwarding efficiency, end-to-end delay, and so forth. In this paper, we outline the model and investigate the process of multiple construction in ODMRP and propose two multiple tree construction process,...
In recent years, various types of ad hoc routing protocols have been studied in the mobile ad hoc networks. Specifically, the clustering hierarchical routing algorithms have been developed to increase the system performance. Hierarchical structure has inevitably brought some drawbacks, maintaining the hierarchical structure needs more complicated cluster heads selection algorithm, which may result...
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