• Title/Summary/Keyword: Ad hoc networks

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A 4S DESIGN ON MOBILE AD HOC NETWORKS

  • Lee, Eun-Kyu;Kim, Mi-Jeong;Oh, Byoung-Woo;Kim, Min-Soo
    • Proceedings of the KSRS Conference
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    • 2002.10a
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    • pp.844-849
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    • 2002
  • A provision of spatial information is expected to make a market explosion in various fields. A distribution of spatial data on wireless mobile environments indicates a huge expansion of mobile technology as well as a spread of geospatial applications. For high quality spatial information, 4S technology project integrating 4 kinds of spatial systems is currently being executed with the goal of nationwide integration of spatial data and spatial information systems. In terms of network environments, a mobile ad hoc network where mobile terminals communicate with each other without any infrastructures has been standardized for the next generation mobile wireless network. With respect to the future technologies for spatial information, it is necessary to design 4S applications on mobile ad hoc networks. This paper addresses the issue, which is proposing design points for distributing 4S spatial data on mobile ad hoc networks and ad hoc styled 4S applications.

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Transmission of Multimedia Traffic over Mobile Ad-hoc Networks (모바일 ad-hoc 네트워크에서 멀티미디어 트래픽 전송)

  • Kim, Young-Dong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.1
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    • pp.95-101
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    • 2005
  • In this paper, some performance characteristics of multimedia traffic for mobile ad-hoc networks is studied with simulations. Synthetic streaming video is considered as the multimedia traffic for MPEG-coded video in the simulation. The synthetic video stream is generated with a video stream generation algorithm. The algorithm generate VBR traffics for MPEG video streams with special predefined GOP(group of pictures) patterns that is consisted of a sequence of I(intra-coded), P(predicted-coded) and B(bidirectional-coded) frames. The synthetic VBR streams is transmitted through UDP protocol with on-demand mobile ad-hoc network routing protocols like as AODV and DSR. And performances for video streams through mobile ad-hoc networks is evaluated, the throughputs is compared between data and video traffics.

Analysis of Power-Saving Protocols for Multi-hop Ad Hoc Networks (다중 홉 Ad Hoc 망에서 Power-Saving 프로토콜의 성능분석)

  • 김동현;김동일
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.05a
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    • pp.203-207
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    • 2003
  • Mobile Ad Hoc Network is a kind of network technology, that mobile hosts can compose networks freely and temporarily where the base networks don't exist and where its establishment is difficult or as occasion demands. Ubiquitous computer network is prograssing in the forms of miniaturization, lightweight or portability. So far, MANET was studied in the point how to route it efficiently, but its power saving problems are been issuing nowadays. We try to not only compare and analyze power saving protocols in multi-hop Ad Hoc network but also present their efficiencies in this thesis.

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An Architecture for Supporting QoS Multicast Routing in Mobile Ad-hoc Networks (모바일 Ad-hoc 네트워크에서 QoS 멀티캐스트 라우팅을 지원하기 위한 구조)

  • An Beong ku
    • Journal of Korea Multimedia Society
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    • v.8 no.1
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    • pp.62-70
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    • 2005
  • In this paper, we present an architecture for supporting QoS multicast routing in mobile ad-hoc networks. The proposed architecture consists of three parts as follows. The first part is a mobility-based clustering as underlying structure for supporting stable multicast services. In the second part, a framework which can support and evaluate the stability of route and network for supporting QoS routing is presented. In the third part, we describe a method which uses two structures of the first and second parts for supporting QoS multicast routing services. The performance evaluation of our proposed architecture is accomplished via modeling and simulation using the Optimized Network Engineering tool(OPNET).

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A Power Aware QoS Routing in Multimedia Ad-hoc Networks (멀티미디어 Ad-hoc 네트워크에서의 전력인지 QoS 라우팅)

  • Kim, Yoon-Do;Seo, Kyung-Ryong
    • Journal of Korea Multimedia Society
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    • v.13 no.2
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    • pp.258-264
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    • 2010
  • In the Ad-hoc networks, the limitation on the availability of power for operation is a significant bottleneck, given the requirements of portability, weight, and size of mobile devices. Hence, the use of routing metrics that consider the capabilities of the power sources of the network nodes contributes to the efficient utilization of energy. This paper presents a QoS routing protocol that minimize the power consumed by a packet in traversing from source node to the destination node. Results obtained of simulation show that, with our approach we can reduce the power consumption of nodes and increases the life time of the network.

A 4S Design on Mobile Ad hoc Networks

  • Lee, Eun-Kyu;Kim, Mi-Jeong;Oh, Byoung-Woo;Kim, Min-Soo
    • Korean Journal of Remote Sensing
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    • v.19 no.1
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    • pp.81-89
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    • 2003
  • A provision of spatial information is expected to make a market explosion in various fields. A distribution of spatial data on wireless mobile environments indicates a huge expansion of mobile technology as well as a spread of geospatial applications. For high-qualified spatial information, the 4S technology Project that is integrating four kinds of spatial systems is currently being executed with the goal of nationwide integration of spatial data and spatial information systems. In terms of network environments, a mobile ad hoc network where mobile terminals communicate with each other without any infrastructures has been standardized for the next generation mobile wireless network. With respect to the future technologies for spatial information, it is necessary to design 4S applications on mobile ad hoc networks. This paper addresses the issue, which is proposing design concepts for distributing 4S spatial data on mobile ad hoc networks and for ad hoc styled 4S applications.

Air Path Establishment Based on Multi-Criteria Decision Making Method in Tactical Ad Hoc Networks (전술 애드혹 네트워크에서 다속성 의사결정 방법 기반 공중 경로 생성 방안)

  • Kim, Beom-Su;Roh, BongSoo;Kim, Ki-Il
    • IEMEK Journal of Embedded Systems and Applications
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    • v.15 no.1
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    • pp.25-33
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    • 2020
  • Multipath routing protocols with unmanned aerial vehicles have been proposed to improve reliability in tactical ad hoc networks. Most of existing studies tend to establish the paths with multiple metrics. However, these approaches suffer from link loss and congestion problems according to the network condition because they apply same metric for both ground and air path or employ the simple weight value to combine multiple metrics. To overcome this limitation, in this study, we propose new routing metrics for path over unmanned aerial vehicles and use the multi-criteria decision making (MCDM) method to determine the weight factors between multiple metrics. For the case studies, we extend the ad-hoc on-demand distance vector protocol and propose a strategy for modifying the route discovery and route recovery procedure. The simulation results show that the proposed mechanism is able to achieve high end-to-end reliability and low end-to-end delay in tactical ad hoc networks.

Aero-Sim: An NS-2 Based simulator for Aeronautical Ad Hoc Networks

  • Luo, Qin;Wang, Junfeng;Wang, Xiaoqing;Wu, Ke
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.7
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    • pp.2548-2567
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    • 2015
  • Recently, there has been a clear trend towards the application of ad hoc networking technology in civil aviation communication systems, giving birth to a new research field, namely, aeronautical ad hoc networks (AANETs). An AANET is a special type of ad hoc wireless network with a significantly larger scale and distinct characteristics of its mobile nodes. Thus, there is an urgent need to develop a simulator to facilitate the research in these networks. In this paper, we present a network simulator, Aero-Sim, for AANETs. Aero-Sim, which is based on the freely distributed NS-2 simulator, enables detailed packet-level simulations of protocols at the MAC, link, network, transport, and application layers by composing simulations with existing modules and protocols in NS-2. Moreover, Aero-Sim supports three-dimensional network deployment. Through several case studies using realistic China domestic air traffic, we show that the proposed simulator can be used to simulate AANETs and can reproduce the real world with high fidelity.

A Load-balancing Routing Protocol using Dynamic Threshold in Ad-hoc Networks (Ad-hoc 망에서 동적 임계값을 이용한 부하균등 라우팅 프로토콜)

  • 한욱표;이춘재;정영준
    • Proceedings of the Korean Information Science Society Conference
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    • 2004.04a
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    • pp.868-870
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    • 2004
  • ad-hoc 망에서 라우팅 프로토콜의 부하균등(load balancing)은 이동성과 전송 지연사이의 trade-off로 인하여 성능 관점에서 중요한 이슈가 되어왔다. 부하균등을 고려한 SLAP(Simple Load-balancing Ad-hoc routing Protocol)이 제안되었으나 혼잡이 발생하거나 망의 토폴로지가 변화하였을 때 유연하게 대처하지 못한다. 본 논문에서는 ad-hoc 망에서 트래픽 혼잡 제어와 망의 이동성에 적응하기 위하여 동적인 임계치를 사용하는 부하균등 라우팅 프로토콜을 제안하였다. 제안된 프로토콜은 성능은 GloMoSim으로 시뮬레이션을 수행하여 AODV, DSR, SLAP과 지연, 패킷 전송률 등을 비교하여 평가하였다.

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Mobile OP Support in Ad-hoc Networks (Ad-hoc 네트워크에서의 Mobile IP 지원!)

  • Shin, J.W.;Na, J.H.;Lee, H.R.;Nam, S.W.;Kim, S.H.
    • Electronics and Telecommunications Trends
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    • v.18 no.4 s.82
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    • pp.11-22
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    • 2003
  • 본 문서는 Ad-hoc 네트워크가 인터넷과 연동되는 환경에서 Mobile IP 기능을 지원하기 위한 기술에 대한 연구 동향을 분석한다. Mobile IP는 이동 노드와 Foreign Agent(FA) 간에 링크 레벨의 연결이 존재하는 네트워크 환경에서 동작하지만, Ad-hoc 네트워크의 경우 노드간에 멀티 홉 라우팅에 의한 통신 방법을 기본적으로 사용하고 있고, 노드의 자유로운 이동으로 인하여 이동 노드에서 FA로의 루트가 수시로 변경되는 특성을 가지고 있기 때문에 Ad-hoc 네트워크에서 Mobile IP를 지원하는 데에는 여러 가지 문제점이 따른다.

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