• Title/Summary/Keyword: Ad hoc networks

Search Result 1,365, Processing Time 0.025 seconds

Dynamic Agent Advertisement of Mobile IP to Provide connectivity between Ad Hoc Networks and Internet (Ad Hoc 네트워크와 인터넷 사이의 연결을 제공하는 모바일 IP의 동적 에이전트 광고)

  • 최대인;정진우;강현국
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2004.04a
    • /
    • pp.652-654
    • /
    • 2004
  • Ad Hoc On-Demand Routing Protocol(AODV)이 ad hoc 네트워크에 알맞게 잘 설계되었지만, 인터넷과의 통신에는 그렇지 못하다. 인터넷과 ad hoc 네트워크의 통합에 몇 가지 해결책이 제안되었다. 그러나 그 제안들은 몇 가지 결점을 가지고 있다. 그에 따라 우리는 중복 제어 패킷을 처리하는 동안의 제어패킷 오버헤드와 전원 소모를 줄인 동적 에이전트 광고를 제안하였으며 패킷 전송에 대한 오버헤드를 기존의 해결책과 비교하였다.

  • PDF

A Secure Authentication Mechanism using PKI in Ad Hoc Networks (Ad hoc 네트워크에서 공개키 기반구조를 이용한 신뢰적인 인증 메커니즘)

  • 봉진숙;윤미연;신용태
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2004.10a
    • /
    • pp.436-438
    • /
    • 2004
  • 이동 ad-hoc 네트워크(mobile ad-hoc network : MANET)는 유선 기반 망 흑은 액세스 포인트 없이 이동 단말기들로 구성된 망이다. 기존의 기반망을 사용하지 않으므로 유선 기반망이 구축되어 있지 않은 곳이나 유선 기반망이 파괴된 지역에 사용한다. 그러나 HANET에서는 노출된 매체와 동적인 토폴로지, 중앙의 감시와 관리 결여, 자원의 제약성 등과 같은 이유로 인해 유선망보다 더욱 않은 보안 문제가 발생한다. 본 논문에서는 이동 ad hoc 네트워크에서 노드의 신분 보장을 제공하기 위하여 기밀성에 중점을 둔 공개키 기반 구조에서의 노드 간 인증 기법을 제안한다.

  • PDF

An Enhanced Routing Protocol for Supporting Node Mobility in Multi-hop Ad-hoc Networks (다중 홉 Ad-hoc 네트워크에서 노드이동성을 고려한 라우팅 프로토콜에 관한 연구)

  • Kim, Kwan-Woong;Kim, Byun-Gon;Kim, Yong-Kab
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.11 no.9
    • /
    • pp.1665-1671
    • /
    • 2007
  • Mobile Ad hoc Networks (MANETs) refer to autonomous networks in which wireless data communications are established between multiple nodes in a given coverage area without a base station or centralized administration. Because of node mobility and limited battery life, the network topology may changes frequently. Selecting the most reliable path during route discovery process is important to improve performance in ad-hoc networks. In this study, we proposed an enhanced routing protocol based on AODV by monitoring variation of receiving signal strength. New metric function that consists of node mobility and hops of path is used for routing decision. From extensive experiments by using NS-2, The performance of the proposed routing scheme has been imp개ved by comparison to AODV protocol.

Improved Intelligent Routing Protocol in Vehicle Ad-hoc Networks (차량 Ad-hoc 혹 통신에서 개선된 지능형 경로 프로토콜)

  • Lee, Dong Chun
    • Convergence Security Journal
    • /
    • v.21 no.1
    • /
    • pp.129-135
    • /
    • 2021
  • Greedy protocols show good performance in Vehicular Ad-hoc Networks (VANETs) environment in general. But they make longer routes causing by surroundings or turn out routing failures in some cases when there are many traffic signals which generate empty streets temporary, or there is no merge roads after a road divide into two roads. When a node selects the next node simply using the distance to the destination node, the longer route is made by traditional greedy protocols in some cases and sometimes the route ends up routing failure. Most of traditional greedy protocols just take into account the distance to the destination to select a next node. Each node needs to consider not only the distance to the destination node but also the direction to the destination while routing a packet because of geographical environment. The proposed routing scheme considers both of the distance and the direction for forwarding packets to make a stable route. And the protocol can configure as the surrounding environment. We evaluate the performance of the protocol using two mobility models and network simulations. Most of network performances are improved rather than in compared with traditional greedy protocols.

Authentication Protocol Using Hamming Distance for Mobile Ad-hoc Network (모바일 Ad-hoc 네트워크에서 Hamming Distance를 이용한 인증프로토콜)

  • Lee, Seok-Lae;Song, Joo-Seok
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.16 no.5
    • /
    • pp.47-57
    • /
    • 2006
  • Mobile Ad-hoc networks have various implementation constraints such as infrastructure-free, no trusted authority, node mobility, and the limited power and small memory of mobile device. And just like wired networks, various security issues such as authentication, confidentiality, integrity, non-repudiation, access control, availability and so on have been arisen in mobile Ad-hoc networks. But we focus on authentication of these security issues because it is quitely affected by the characteristics of networks. In this paper, we propose the authentication protocol that can limit the size of certificate repository as $log_2N$ and assures to make a trusted certificate path from one node to another, adopting the concept of Hamming distance. Particularly, our protocol can construct a trusted certificate path in spite of decreasing or increasing the number of nodes in mobile Ad-hoc network.

Multi-Channel/Radio based CAC Mechanism for Wireless Ad-hoc Networks (무선 애드혹 통신망용 멀티 채널/라디오 기반 호접속 제어 메저니즘)

  • Ko, Sung-Won;Kang, Min-Su;Kim, Young-Han
    • Journal of KIISE:Information Networking
    • /
    • v.34 no.5
    • /
    • pp.396-404
    • /
    • 2007
  • In this paper, an Ad-hoc Routing Protocol which works in wireless Ad-hoc communication networks with multiple radios and multiple channels, and controls call admission based on bandwidth measurement is proposed. Unlike the conventional Ad-hoc node with a single radio using a single channel, an Ad-hoc node of the protocol proposed, MCQosR(Multiple Channel Quality of Service Routing), has multiple radios and uses multiple channels, which makes full duplex transmission between wireless Ad-hoc nodes, and reduces the intra interference on a route. Also, a fixed channel only for reception at each node enables the measurement of the available bandwidth, which is used to control the call admission for QoS provision. The performance of MCQosR is verified by simulation.

Leader Decision Protocol for Dynamic Changing Topology in Mobile Ad hoc Networks (모바일 ad hoc 네트워크에서 동적인 토폴로지 변화에 따른 리더 결정)

  • Kim, Young-Lan;Han, Hyun-Goo;Park, Sung-Hoon
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.11 no.11
    • /
    • pp.4543-4552
    • /
    • 2010
  • A leader is a special process who roles as the coordinator within multiple processes of a group. In a distributed system, leader election is the procedure of electing a coordinator. This is a very important issue for building fault-tolerant distributed systems. When two normal mobile ad hoc networks are merged, there are two leaders. This violates the safety property, so a mechanism to detect and handle are required. In mobile ad hoc distributed computing system, we propose a leader competition protocol and to prove the temporal logic to it. This solution is based on the group membership detection algorithm.

Comprehensive Survey on Multi Attribute Decision Making Methods for Wireless Ad Hoc Networks

  • Beom-Su Kim;Ki-Il Kim;GyuRi Chang;Kyong Hoon Kim;BongSoo Roh;Jae-Hyun Ham
    • Journal of Internet Technology
    • /
    • v.20 no.5
    • /
    • pp.1575-1588
    • /
    • 2019
  • Recently, to design dynamic networks without existing infrastructure, wireless ad hoc networks have been proposed to establish self-organizing networks. In this type of network, to resolve the primary research challenge of establishing a stable path between source and destination, several metrics or utility values have been proposed to meet the specific objectives, as well as improve packet delivery ratio when developing communication protocols or addressing technical issues. Notably, most existing studies use the Multi Attribute Decision Making (MADM) algorithm to balance weights between relevant metrics to realize the above objective. However, despite their significant efforts, a comprehensive survey paper analyzing them together has not been published. Thus, in this paper, we describe the recent research and development efforts to employ MADM in ad hoc networks. First, we provide an overview of MADM and explain the well-known algorithms. After categorizing the current work according to the algorithms, the existing schemes are further divided by the type of networks. Based on this classification, we then detail the procedures with their research objectives. Furthermore, we present other research challenges and apparent problems in this research area.

A New Framework for Ad Hoc Network routing Protocol without Destination Sequence Number (목적지 순차 번호를 사용하지 않은 새로운 구조의 Ad Hoc 네트워크의 라우팅 프로토콜)

  • Seo, Jae-Hong;Jung, Ho-Youl
    • IEMEK Journal of Embedded Systems and Applications
    • /
    • v.2 no.3
    • /
    • pp.155-163
    • /
    • 2007
  • In Ad Hoc Networks, a connection breaks due to the irregular movement of mobile nodes and the inherent characteristics of the wireless medium such as the interference and the multi-path fading. AODV, a typical on-demand routing protocol in Ad Hoc networks, uses Destination sequence numbering for loop-free, but it may cause RREQ broadcast storm problem. This paper proposes AODV_ods that does not need destination sequence number, in routing message and routing table without routing loop. To show the effectiveness of the proposed scheme, we performed extensive simulation with NS-2. The simulation results show that the proposed ADOV_ods efficiently uses wireless bandwidth compare to the original AODV. Finally AODV ods reduces the routing overhead, end to end delay and increases the overall packet delivery ratio.

  • PDF

Improved Ad Hoc On-demand Distance Vector Routing(AODV) Protocol Based on Blockchain Node Detection in Ad Hoc Networks

  • Yan, Shuailing;Chung, Yeongjee
    • International Journal of Internet, Broadcasting and Communication
    • /
    • v.12 no.3
    • /
    • pp.46-55
    • /
    • 2020
  • Ad Hoc network is a special wireless network, mainly because the nodes are no control center, the topology is flexible, and the networking could be established quickly, which results the transmission stability is lower than other types of networks. In order to guarantee the transmission of data packets in the network effectively, an improved Queue Ad Hoc On-demand Distance Vector Routing protocol (Q-AODV) for node detection by using blockchain technology is proposed. In the route search process. Firstly, according to the node's daily communication record the cluster is formed by the source node using the smart contract and gradually extends to the path detection. Then the best optional path nodes are chained in the form of Merkle tree. Finally, the best path is chosen on the blockchain. Simulation experiments show that the stability of Q-AODV protocol is higher than the AODV protocol or the Dynamic Source Routing (DSR) protocol.