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This article presents simulation results for a mobile ad-hoc network running Dynamic Source Routing reactive protocol under the conditions of limited availability and heightened response times of network nodes. Authors conclude that dynamic source routing stops being efficient in large networks and propose a hybrid routing protocol that includes the proactive phase and uses availability criterion...
In this work we investigate the performance of Ad-hoc on-demand distance vector routing (AODV), Dynamic source routing (DSR), Temporary ordered routing (TORA), Optimized link state routing (OLSR) and Geographic routing (GRP) protocols in wireless ad-hoc networks by using OPNET simulation program. In ad-hoc networks consisting of fixed and mobile stations, routing protocols are compared for different...
A Mobile Ad-hoc networks (MANETs) is composed of Mobile Nodes without any fixed infrastructure. Multicast routing in mobile Ad-hoc networks (MANETs) have many defiance due to implicit characteristics of the network such as node mobility, reliability, finite network resources etc. So, in this paper we have introduced a new scheme to improve the performance and efficiency of multicast routing protocols...
Mobile ad-hoc network is a type of ad-hoc network where nodes change locations with time, configure themselves and get the information transmitted from source to destination without the help of any fixed router or base station. Hence, for efficient data transmission, it is critical to understand the type of routing algorithms that is being used by these networks. Since they have no fixed infrastructure...
Ad hoc is a Latin word which describes solutions for this or specific purpose. In the world of computer network, an ad hoc network refers to a network connection which established for a single session and does not require wireless base station; they are on-the-fly networks. Energy, security and selfishness have been amongst the most popular issues for researchers in recent years. Selfish node is stated...
Research and propose a path collection mechanism optimization scheme of AODV protocol. This scheme adopts the path collection mechanism in DSR protocol to improve the performance of AODV, meanwhile it avoids being affected by the high running overhead and weak scalability of DSR protocol. Results obtained by OPNET Simulation shows that the optimized AODV scheme performs effectively in terms of packet...
The frequent movement of mobile terminal in the process of Ad-hoc network data transmission often leads to data loss and then the Vegas algorithm mistakenly thinks that occurred the congestion of the network, resulting in the decline of network communication performance. This paper proposes a congestion avoidance strategies in the improvement of Vegas algorithm, the new algorithm can increase the...
The ad-hoc network is a collection of wireless mobile nodes without any support of a stationary infrastructure. Due to the node's mobility and the network topology changes to be kinetic, the network disconnection occur frequently. This paper proposes a variation of the AODV protocol, which selects CORE nodes using path's accumulation information, and then establishes multi paths based on CORE-node's...
In case of wireless networks with infrastructure there is a base station which is reachable through all mobile nodes. Ad-hoc network defers in this point where destination nodes might be unreachable from source nodes. The Mobile Ad-Hoc Network are prone to packet loss and route congestion due to their dynamic nature. The lack of centralized infrastructure adds up to these problems. In this respect...
In Mobile Ad-hoc Networks (MANET), the nodes intercommunicate through single-hop and multi-hop paths in a peer-to-peer fashion. Intermediate nodes between two pairs of communication nodes act as routers. Thus, the routing protocols play an important role for construction of MANET. Though the research of the routing protocol for MANET is actively done, most performance evaluations are evaluated via...
Mobile Ad-hoc network is a collection of two or more node equipped with low power device for data transmission. Many Proactive based Power Aware Routing (PAR) protocol was implemented by many researchers. An optimized power reactive routing protocol describes the concepts of cognitive function and AODV protocol. It ensures that data packet is transferred in the shortest path and also in reliable mode...
Energy efficient Routing is one of the key issues in MANETs due to their highly dynamic topology and limited battery power at the nodes. In particular identifying energy efficient routing is the most important design criterion in static and dynamic ad-hoc networks. Power failure of a mobile node not only affects the node itself but also reduces the overall network lifetime. The goal of this paper...
In recent years, there are many research works on ad hoc networks. In the future, we will see many ad hoc network applications, which are very important for realizing ubiquitous environments. The topology of ad hoc networks may change. For this reason, the routing protocols play an important role for construction of ad hoc networks. In this paper, we propose a new zone based routing protocol, which...
The limited lifetime of batteries and the bandwidth limitation of channels are the major issues in Ad-hoc networks. The term Congestion is usually associated with the bandwidth issues. The bandwidth keeps varying and when there is insufficient bandwidth to satisfy the demand, we say we have a congestion problem. Congestion control methods are partially implemented in the network elements (e.g.: routers)...
The IETF working group's aim is to speed up development of the standard for the IP address auto-configuration in Ad-Hoc networks. Many studies have been investigated to complete an automatic configuration, but IP address auto-configuration remains an unresolved issue in Ad-Hoc networks. The approaches taken in these studies differ. We provide a framework to compare factors of Ad-Hoc networks. This...
An ad-hoc network is a multi-hop wireless network where all nodes cooperatively maintain network connectivity without a centralized infrastructure. If these nodes change their positions dynamically, it is called a mobile ad-hoc network (MANET). Since the network topology changes frequently, efficient adaptive routing protocols such as AODV, DSR, and NTP are used. As the network is wireless, security...
Ad-hoc network is a self organizing and adaptive in nature. Since it is a dynamic multihop wireless network and established by a cluster of mobile nodes on a shared wireless channel. The transitive closure of the neighborhood of all the hosts or nodes in the set of mobiles under consideration forms network. Each node is potentially a router and it is possible to dynamically establish routes by changing...
The communication between wireless ad-hoc networks and infrastructure-based networks is essential to extend Internet beyond its traditional scope, to remote inaccessible areas, making Web services in ad-hoc networks available anytime, anywhere. The mobile nodes in a wireless ad-hoc network must be able to detect available gateways and select one of them if they want to have Internet access. In this...
AOMDV protocol is designed for highly dynamic ad hoc networks where link failures and route breaks occur frequently. However, the rapidly changing topology makes the limited power nodes exhaust rapidly, which makes the network split early with the decrease of the networks lifetime. A new multipath protocol called multipath routing protocol for networks lifetime maximization in ad-hoc networks (MRNLM)...
Hybrid wireless networks combining the advantages of both ad-hoc networks and infrastructure wireless networks have been receiving increasingly attentions because of their ultra-high performance. An efficient data routing protocol is an important component in such networks for high capacity and scalability. However, most routing protocols for the networks simply combine an ad-hoc transmission mode...
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