• Journal of the Korea Computer Industry Society
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• v.2 no.9
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• pp.1209-1218
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• 2001

In this dissertation, we propose a dynamic source routing protocol supporting asymmetric path for mobile ad hoc networks. At present, the existing dynamic source routing protocol supports only symmetric path for routing. However, in fact, there can exist unidirectional links due to asymmetric property of mobile termenals or current wireless environment. Thus, we implement a mobile ad hoc routing protocol supporting asymmetric routing path, which is fit for more general wireless environment. Especially, the proposed protocol uses an improved multipath maintenance method in order to perform rapid route reconfiguration when route error due to mobility is detected.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.63-64
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• 2016

Ad-hoc Network는 노드의 이동성과 제한된 배터리 수명에 의해 Network 토폴로지가 자주 교체되며 이런 연유로 적합한 Routing Protocol을 선택하는 것도 매우 중요한 과제이다. 본 논문에서는 자주 변화하는 Ad-hoc Network에 적합한 Routing Protocol을 선정하기 위해서 OMNeT++을 이용해 시뮬레이션 환경을 설정하고 각 Routing Protocol 특성을 파라미터 화시켜 적용, 요소별 수치를 비교 분석하여 성능평가를 하였다.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.60 no.4
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• pp.257-261
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• 2011

In this paper, we research the OLSR(Optimized Link State Routing Protocol) of the mobile ad-hoc network protocols, and design the system implementation based on the Embedded Linux for the Ubiquitous Space construction. We prove the performance of proposed system in the various experiment environments through several scenarios which is about transmitting the image data on the mobile ad-hoc network environment.

• The Journal of the Korea Contents Association
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• v.11 no.1
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• pp.65-71
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• 2011

In this paper, the RFID / USN-based ad-hoc network structure is presented for efficient operation of a container terminal yard. Communication between fixed or mobile devices in the container terminal yard is accomplished through the ad-hoc node, to collect the status information of a container in real time. Any outside shipper of the container as well as central server allows to share the status information of a container through ad-hoc communication. In addition, to predict the maximum wireless transmission range of nodes by RFID tag position in the yard, LAODV (Location based AODV) routing protocol is proposed. The validity is proved by performance evaluation via computer simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.12
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• pp.1256-1262
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• 2012

Mobile ad hoc networks (MANETs) are infrastructure-less, autonomous, and stand-alone wireless networks with dynamic topologies. Recently, cluster-based ad hoc networks which enhance the security and efficiency of ad hoc networks are being actively researched. And routing protocols for cluster-based ad hoc networks are also studied. However, there are few studies about secure routing protocols in cluster-based ad hoc networks. In this paper, we propose secure routing protocol for cluster-based ad hoc networks. We use Diffie-Hellman key agreement, HMAC, and digital signature to support integrity of routing messages, and finally can perform secure routing.

• Journal of Korea Multimedia Society
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• v.15 no.3
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• pp.356-363
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• 2012

Power Aware Routing Protocol of MANET(Mobile Ad-hoc Network) minimized the power consumption of each node and helped to extend the lifetime of the network. But due to the nature of the protocol, it tends to increase the transmission delay, so multimedia transmissions were difficult to be applied. In this paper, a delay-power aware routing protocol is proposed considering the delay transmission delay that can be applied to ad hoc network. The proposed protocol consider two conflicting index, transmission delay and power consumption at the same time, maintaining a certain level of delay transmission delay while minimizes the power consumption. It is observed from the simulation results compared to not-considering delay transmission delay that the proposed protocol decrease transmission delay by 30% while the power consumption less than 10% increase.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.5A
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• pp.526-535
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• 2008

Recently, several MAC protocols using the directional antennas have been proposed for wireless mobile ad hoc networks. In the theory, it can improve spatial reuse and communication throughput in the Mobile Ad-hoc networks. But, or However even though direction transmissions using the Directional MAC protocol(D-MAC) are expected to provide significant improvements, they causes other problems such as deafness problem and fairness problem. In this paper, we analyze the D-MAC protocol in Mobile Ad-hoc network for Vehicle to vehicle(V2V) communication. Through the results of the analysis, We the fundamental problem of D-MAC protocol and finally we suggest new D-MAC protocol for V2V networks.

• 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.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.616-618
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• 2003

최근 급속하게 성장하고 있는 무선 이동 통신 분야중의 한 분야가 Ad hoc 네트워크 분야일 것이다. Ad hoc 네트워크는 기존의 고정된 네트워크의 한계를 뛰어 넘는 네트워크이다. 본 연구에서는 Ad hoc 네트워크의 클러스터 기반의 라우팅 프로토콜에서의 인증에 대한 프로토콜을 멀티 계층으로 설계하였다. CBRP(Cluster Based Routing Protocol)의 라우팅 프로토콜에서는 클러스터간의 인증을 위하여 CH(Cluster Head)간의 인증을 통하여 인증을 하게 된다. CH간의 신뢰성을 위하여 MCH(Main Cluster Head)를 두어 CH간의 신뢰성을 보장함으로써 상호 클러스터간의 인증을 위한 프로토콜을 설계하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.8
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• pp.1561-1570
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• 2009

Being different from traditional mobile communication networks or wireless LAN with access points, ad hoc network can provide direct communications between homogeneous stations. Thus, it can be considered as a much advanced network. Somehow, many researches have been done to enhance system performance of ad hoc networks up to now, one of which is cooperative communications. In this paper, a cooperative MAC protocol, called CO-MAC protocol, is proposed and its performance is evaluated with a mathematical approach. Numerical results show that this scheme provides more enhanced system throughput especially when frame transmission error probability is high than DCF scheme, which is the key protocol in IEEE 802.11 standard, and rDCF scheme.