• Journal of Advanced Navigation Technology
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• v.14 no.2
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• pp.253-259
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• 2010

Wireless mesh network is flexible network like Ad hoc network or bluetooth together based on base station. But, wireless mesh network shows high packet loss and when TCP was created, however as it was design based on wired link, wireless link made more transmission error than wired link. It is existent problem of TCP congestion control algorithm that TCP unfairness and congestion collapse over wireless mesh network. When TCP operation occurs with the packet loss where is not the congestion loss, it brings the performance degradation which is serious. In this paper, in order to improve efficient TCP congestion control algorithm in wireless mesh network, we proposed that TCP can adaptively regulate the congestion window in wireless link.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.629-632
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• 2006

기존의 무선 네트워크에 비해 빠르고 저렴하며 설치가 편리한 무선 메쉬 네트워크를 인터넷망 구성에 도입하려고 하는 것이 최근의 경향이다. 무선 메쉬 네트워크는 이종망간의 네트워크를 통합함으로 수많은 클라이언트들을 통제해야하며 기존의 IPv4 주소는 10년 내에 고갈이 됨으로, IPv6 주소 환경에 적합하게 연구 개발하여야 한다. 그러나 아직 무선 메쉬 네트워크는 개발 중인 기술로써 보완해야할 보안상의 문제점들이 발견되고 있다. 본 논문에서는 무선 메쉬 네트워크에 MIPv6를 어떻게 도입할지를 언급하고 MIPv6 도입 시에 발생하게 되는 보안상의 문제점을 SEND(SEcure Neighbor Discovery)와 MCGAs를 이용하여 해결하는 방법을 소개한다.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.4
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• pp.421-426
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• 2010

Due to the ease of deployment and the extended coverage, wireless mesh networks (WMNs) are gaining popularity and research focus. For example, the routing protocols that enhance the throughput on the WMNs and the link quality measurement schemes are among the popular research topics. However, most of these works assume that the locations of the mesh routers are predetermined. Since the operators in an Indoor mesh network can determine the locations of the mesh routers by themselves, it is essential to the WMN performance for the mesh routers to be initially placed by considering the performance issues. In this paper, we propose a mesh router placement scheme based on genetic algorithms by considering the characteristics of WMNs such as interference and topology. There have been many related works that solve similar problems such as base station placement in cellular networks and gateway node selection in WMNs. However, none of them actually considers the interference to the mesh clients from non-associated mesh routers in determining the locations of the mesh routers. By simulations, we show that the proposed scheme improves the performance by 30-40% compared to the random selection scheme.

• Journal of Industrial Convergence
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• v.18 no.2
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• pp.69-75
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• 2020

Industrial IoT has much interested in wireless mesh networks (WMNs) due to cost effectiveness and coverage. According to the advance in caching technology, WMNs have been researched to overcome the throughput degradation of multihop environment. However, there is few researches of cache power consumption models for WMNs. In particular, a wired line based cache power consumption model in content-centric networks is not still proper to WMNs. In this paper, we split the amount of cache power from the idle power consumption of CPU, and then the cache hit ratio proportional power consumption model (CHR-model) is proposed. The proposed CHR-model provides more accurate power consumption in WMNs, compared with the conventional cache power efficiency based consumption model (CPE-model). The proposed CHR-model can provide a reference model to improve energy-efficient cache operation for Industrial IoT.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.3
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• pp.572-580
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• 2010

The Wireless Mesh Network uses a wireless communication technology with transmission rates simular to a cable which is used as a backbone networks. The topology structure is in a Mesh form which resembles an Ad-hoc networks. However, a metric is needed in order to set the channel access control method to operate intentions and interior motions are different. In this document, an efficient channel for delivering datas to improve access controls to a wireless mesh networks. The improved performance of the proposed plan is for a hidden and exposed mesh client through an exclusive channels to perform a proposed and analyzed methods.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.5
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• pp.54-62
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• 2007

We propose a novel authentication protocol for wireless mesh network. The proposed authentication protocol is based on the password scheme for convenience of users. The proposed protocol is evaluated through three analyses. The correctness of the proposed protocol is proved using the GNY analysis. By the security analysis, we show that the proposed protocol is resistant to various attacks. For the performance analysis, we implemented the protocol in Linux operating system based laptop and measured the transmission time. The analytic results show that the proposed protocol provides the secure wireless mesh network without considerable performance degradation.

• 한국IT서비스학회:학술대회논문집
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• 2007.11a
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• pp.326-331
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• 2007

u-City는 첨단 정보통신 인프라를 바탕으로 유비쿼터스 정보서비스를 제공함으로써 도시의 문화와 역사를 반영한 환경 친화적이고, 경제적이면서 도시의 가치를 높이는 스마트한 미래형 첨단 도시이다. 따라서, u-City를 구축하기 위해서는 경제성을 반드시 고려해야한다. 본 연구에서는 정부와 지자체, 토지개발사업자, 통신사업자, 대형 SI, 솔류션 제공사업자에 의하여 진행되고 있는 신도시 또는 기존도시, 개발사업 등에 효율적으로 적용가능한 무선메쉬네트워크 기술을 제안한다. 본 연구에서 제안한 무선메쉬네트워크를 u-City 인프라로 활용할 경우 50%이상의 경비절감을 구현할 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.2A
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• pp.113-123
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• 2009

Wireless mesh networks have been studied as the next generation technology to solve problems of conventional wireless networks. Particularly, mobile WiMAX based wireless mesh networks are noticed due to many advantages. In this paper, we propose a layer-2 handover scheme for mobile WiMAX based wireless mesh networks. A layer-2 handover scheme based on mobile WiMAX causes many handover failures over mobile WiMAX based wireless mesh networks because it does not consider the characteristics of wireless mesh networks. The proposed scheme does not bring about packet losses achieving lower handover latency than a conventional handover scheme. Simulation results show that the proposed scheme achieves loss-free and low handover latency during the layer-2 handover.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06d
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• pp.311-314
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• 2011

Wi-Fi 메쉬 네트워크는 IEEE 802.11 표준을 기반으로 노트북, 스마트폰 등의 무선 단말에 인터넷 연결을 제공하기 위한 무선 다중 홉 네트워크이다. Wi-Fi 메쉬 네트워크에서는 무선 채널의 방송 특징으로 인해 발생하는 간섭(Interference) 때문에 프레임 충돌 문제가 발생한다. 본 논문에서는 이러한 프레임 간섭을 미연에 방지하는 스케줄링 MAC 프로토콜을 제안한다. 제안하는 방법은 각각의 무선 채널에서 간섭 조건을 만족하는 링크 조합을 결정하고, 이를 통하여 Wi-Fi 메쉬 네트워크의 프레임 전달 수율(Throughput)을 극대화함을 목표로 한다. 시뮬레이션 결과를 통해 본 논문에서 제시하는 스케줄링 MAC 프로토콜이 기존에 알려진 CSMA/CA 기반의 MAC 프로토콜에 비해 수율을 50 % 이상 향상함을 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.928-931
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• 2007

다중 전송률을 지원하는 무선 메쉬 네트워크에서 노드는 전송률 조절을 함으로써 링크의 전송범위를 동적으로 조절할 수 있다. 다중 전송률 무선 메쉬 네트워크에서의 브로드캐스트 알고리즘인 WCDS 에서는 브로드캐스트 트리 생성시 고려하는 노드가 같은 비교 값을 가졌을 때 임의로 노드를 선택한다. 본 논문에서는 이를 보완하여 소스노드로부터의 지연시간을 고려하여 전체 지연시간 최소화를 위한 브로드캐스트 알고리즘인 MinLink_WCDS 알고리즘을 제안한다. 시뮬레이션을 통해 802.11 파라미터를 기본으로 한 다중 전송률 무선 메쉬 네트워크에서 MinLink_WCDS 알고리즘과 기존에 제안된 알고리즘들과의 지연시간 결과를 비교하여 브로드캐스트 지연시간이 향상된 것을 보여준다.