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EN
Mobile Ad hoc Network (MANET) is a collection of wireless mobile nodes that dynamically form a network temporarily without any support of central administration. Moreover, every node in MANET movesarbitrarily making the multi-hop network topology to change randomly at unpredictable times. Therefore, the routing protocol that able to cope with the dynamic nature of the MANET is needed to maintain the communication data between mobile nodes in the network. This paper presents the performance compariso of OLSR and DSDV, protocols based on metrics such as packet delivery ratio, average end-to-end delay, and routing overhead by using the NS-2 simulator. The simulation results show that the performance of DSDV outperformed OLSR protocols in terms of average delay and routing overhead.
PL
Mobile Ad hoc Network (MANET) to zbiór bezprzewodowych węzłów mobilnych, które dynamicznie tworzą tymczasowo sieć bez wsparcia centralnej administracji. Co więcej, każdy węzeł w MANET porusza się w sposób arbitralny, co sprawia, że topologia sieci z wieloma przeskokami zmienia się losowo w nieprzewidywalnych momentach. Dlatego protokół routingu, który jest w stanie poradzić sobie z dynamiczną naturą MANET, jest potrzebny do utrzymania danych komunikacyjnych między węzłami mobilnymi w sieci. W artykule przedstawiono porównanie wydajności OLSR i DSDV, protokołów opartych na metrykach, takich jak współczynnik dostarczania pakietów, średnie opóźnienie między punktami końcowymi oraz obciążenie trasowania przy użyciu symulatora NS-2. Wyniki symulacji pokazują, że wydajność DSDV przewyższała protokoły OLSR pod względem średniego opóźnienia i narzutu routingu.
EN
Recently, the lack of independent wireless networks deployment was the main reason not only loosing victims but also diminution of the performance of security forces and first aids services during natural disasters and wars. Mobile Ad Hoc Networks (MANET) is the technology of choice used in such critical situations where the infrastructure of wireless networks fails to work. MANET relies on its nodes to forward and route packets that gives it a characteristic of an independent network. The independence here means that the network relies on its battery power to achieve its routing. In this research work, we study two types of MANET protocols belonging to different kinds of routing protocol categories: namely reactive protocol and proactive protocol in terms of power consumption. More specifically, we are interested on the Destination-Sequenced Distance-Vector (DSDV), Optimized Link State Routing (OLSR), Ad Hoc On-Demand Distance-Vector (AODV) and Dynamic Source Routing (DSR) protocols to investigate how much power they consume at different layers, operation modes, routing overhead and MAC load. In order to achieve the goal of performance study, we choose some scenarios that can be adapted to different MANET contexts: such scenarios carried out when network area size, network density, pause time and mobile node speed are changing. Extensive simulations and results for these scenarios obtained by NS2 simulation software.
3
Content available remote An Intrinsic Study on Routing Protocols in Mobile Ad-Hoc Network
EN
Mobile Ad-Hoc Networks (MANET) are becoming an emanating technology among mobile devices. It is a structure less network of independent collection of wireless mobile nodes [Smart phones, Laptops, iPads, PDAs, Sensors etc.] connected by wireless links. Routing in Ad-hoc networks is challenging due to mobility of nodes and dynamically changing topology. The primary objective of the routing protocols is to establish an optimal and efficient route between the communicating nodes. Due to different network environments like varying number of nodes, speed, network load, it is difficult to figure out which routing protocol may perform well. This study investigates the performance and behavior of MANET routing protocols such as DSDV, AODV, NCPR and ZRP with a special focus on their comparison, functionality and issues. In this review, we analyzed about the protocols based on various quantitative parameters such as average throughput, packet delivery ratio, routing overhead and average end to end delay.
EN
An ad hoc wireless network consists of mobile networks which create an underlying architecture for communication without the help of traditional fixed-position routers. There are different protocols for handling the routing in the mobile environment. Routing protocols used in fixed infrastructure networks cannot be efficiently used for mobile ad-hoc networks (MANET), so it requires different protocols. The node moves at different speeds in an independent random form, connected by any number of wireless links, where each node is ready to pass or forward both data and control traffic unrelated to its own use ahead (routing) to other nodes in a flexible interdependence of wireless communication in between. In contrast to infrastructure wireless networks, where the communication between network nodes is take place by a special node known as an access point. It is also, in contrast to wired networks in which the routing task is performed by special and specific devices called routers and switches. In this paper, we consider fuzzy inference system, an attempt has been made to present a model using fuzzy logic approach to evaluate and compare three routing protocols i.e. AODV, DSDV and DSR using effective factor of the number of nodes based on 3 outputs of control overhead, delay and PDR (totally fuzzy system with 4 outputs) in order to select one of these two routing protocols properly under different conditions and based on need and goal. To show efficiency and truth of fuzzy system, three protocols have been evaluated equally using NS-2 simulator and attempt has been made to prove efficiency of the designed fuzzy system by comparing results of simulation of fuzzy system and NS-2 software.
5
Content available remote Efficient Mechanism to Exchange Relevant Messages in Vehicular Ad Hoc Networks
EN
Broadcast is the commonly used technique for data dissemination in VANETs .It requires unicast and multicast protocols for connectivity and maintenance of path. Broadcast has the problem of surplus data. In order to resolve it, we modify the” Hello” packet of Optimized Link State Routing Protocol (OLSR) and add a new parameter called preference list. It contains the interest of the vehicle and data which current vehicle has. Due to mobility, there is very short time available for data exchange and limited messages are only communicated according to neighbour preference. We evaluate the modified OLSR with the help of Network Simulator in VANETs scenario. So in this way, surplus data and network load is reduced.
PL
W artykule przedstawiono zmodyfikowany protokół transmisji danych OLSR z dodatkiem tzw. listy preferencji, który wykorzystywano w sieci typu VANET. W związku z mobilnością elementów, możliwa jest tylko krótkoterminowa wymiana danych w ograniczony sposób, wysyłanie wiadomości. Proponowane rozwiązanie pozwala na redukcję danych nadwyżkowych i obciążenia sieci.
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