• 한국정보통신학회논문지
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• 제14권3호
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• pp.572-580
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• 2010

무선 메쉬 네트워크 기술은 유선과 비슷한 전송속도를 가지는 무선 통신 기술을 이용해서 무선 백본망으로 사용하는 기술을 의미하며 토폴로지는 메쉬 형태를 갖는다. 이러한 형태는 Ad-hoc 네트워크와 유사한 점을 가지고 있지만 운용 목적과 내부 동작에서 다르기 때문에 채널접속 제어방법을 설정하기 위한 메트릭이 요구 된다. 본 논문에서는 데이터를 전달하기 위한 효율적인 채널접속 제어방법을 개선하여 무선 메쉬 네트워크의 성능을 향상시키는 방안에 대하여 제안하였으며 음영과 노출 메쉬 클라이언트, 채널 독점 등을 통해서 제안한 방법에 대한 성능을 분석하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권10호
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• pp.2509-2528
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• 2012

Time division multiple access (TDMA) is a widely used media access control (MAC) technique that can provide collision-free and reliable communications, save energy and bound the delay of packets. In TDMA, energy saving is usually achieved by switching the nodes' radio off when such nodes are not engaged. However, the frequent switching of the radio's state not only wastes energy, but also increases end-to-end delay. To achieve high energy efficiency and low delay, as well as to further minimize the number of time slots, a multi-objective TDMA scheduling problem for industrial wireless mesh networks is presented. A hybrid algorithm that combines genetic algorithm (GA) and simulated annealing (SA) algorithm is then proposed to solve the TDMA scheduling problem effectively. A number of critical techniques are also adopted to reduce energy consumption and to shorten end-to-end delay further. Simulation results with different kinds of networks demonstrate that the proposed algorithm outperforms traditional scheduling algorithms in terms of addressing the problems of energy consumption and end-to-end delay, thus satisfying the demands of industrial wireless mesh networks.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권7호
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• pp.3386-3411
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• 2019

Secured and reliable routing is a crucial factor for improving the performance of Wireless Mesh Networks (WMN) since these networks are susceptible to many types of attacks. The existing assumption about the internal nodes in wireless mesh networks is that they cooperate well during the forwarding of packets all the time. However, it is not always true due to the presence of malicious and mistrustful nodes. Hence, it is essential to establish a secure, reliable and stable route between a source node and a destination node in WMN. In this paper, a trust based secure routing algorithm is proposed for enhancing security and reliability of WMN, which contains cross layer and subject logic based reliable reputation scheme with security tag model for providing effective secured routing. This model uses only the trusted nodes with the forwarding reliability of data transmission and it isolates the malicious nodes from the providing path. Moreover, every node in this model is assigned with a security tag that is used for efficient authentication. Thus, by combining authentication, trust and subject logic, the proposed approach is capable of choosing the trusted nodes effectively to participate in forwarding the packets of trustful peer nodes successfully. The simulation results obtained from this work show that the proposed routing protocol provides optimal network performance in terms of security and packet delivery ratio.

• Journal of Communications and Networks
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• 제18권6호
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• pp.884-891
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• 2016

The wireless mesh network (WMN) has attracted significant interests as a broadband wireless network to provide ubiquitous wireless access for broadband services. Especially with incorporating multiple orthogonal channels and multiple directional antennas into the WMN, each node can communicate with its neighbor nodes simultaneously without interference between them. However, as we allow more freedom, we need a more sophisticated algorithm to fully utilize it and developing such an algorithm is not easy in general. In this paper, we study a joint channel assignment, link scheduling, routing, and rate control problem for the WMN with multiple orthogonal channels and multiple directional antennas. This problem is inherently hard to solve, since the problem is formulated as a mixed integer nonlinear problem (MINLP). However, despite of its inherent difficulty, we develop an algorithm to solve the problem by using the generalized Benders decomposition approach [2]. The simulation results show the proposed algorithm provides the optimal solution to maximize the network utility, which is defined as the sum of utilities of all sessions.

• 한국통신학회논문지
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• 제33권3A호
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• pp.304-310
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• 2008

In a wireless mesh network, there are two types of nodes: mesh routers and mesh clients. These two contradistinct network entities will be characterized and modeled depending on their role in the network. Mesh routers are essentially not mobile unlike the mesh clients. The differences on these nodes should be noted in any protocol design. In this paper, we present a mobility management for wireless mesh network (WMN). This mobility management handles movement of wireless mesh clients as it leaves from a coverage area of a wireless mesh router to another. We consider signaling overhead and mobility as performance metrics.

• 한국항행학회논문지
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• 제12권4호
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• pp.350-356
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• 2008

무선 네트워크 기술의 급격한 발전으로 유선 인터넷 기반의 서비스가 무선 인터넷에서도 사용되고 있다. 하지만 물리적인 특성만으로는 무선 네트워크의 성능이 유선 네트워크와 대등해 질 수 없다. 따라서 물리적인 특성의 단점을 보완하기 위해 라우팅 프로토콜에 관심을 보여야 한다. 현재의 무선 네트워크의 라우팅 프로토콜은 다른 부분에 비하여 활발히 연구되지 못하고 있다. 이에 본 논문에서는 현재 가장 많이 활용되는 무선 네트워크의 라우팅 프로토콜인 AODV를 분석하여 무선 메쉬 네트워크의 특성에 맞게 개선된 라우팅 알고리즘을 제안하고 시뮬레이션을 통해 그 성능을 평가하였다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2008년도 추계학술대회 및 정기총회
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• pp.525-528
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• 2008

We propose a IDS node selection scheme for intrusion detection in wireless mesh networks. The proposed scheme considers network survivability and energy consumption. To utilize wireless resources efficiently, we apply a set covering problem (SCP) to IDS nodes selection problem. Our proposed scheme also considers congested networks.

• 한국정보과학회논문지:정보통신
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• 제36권1호
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• pp.1-11
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• 2009

이 논문은 WiMAX기반의 무선 메쉬 네트워크에서 QoS를 지원하는 라우팅 프로토콜을 제안한다. 본 논문에서 제안하는 라우팅 프로토콜은 대역폭과 지연을 QoS 파라미터로 사용하여 QoS 요구사항을 만족시키는 최적 경로를 찾는 테이블 관리(table-driven or proactive) 방식의 홉 간(hop-by-hop) QoS 라우팅 프로토콜이다. 우리는 먼저 WiMAX기반의 무선 메쉬 네트워크의 네트워크 모델을 소개하고, WiMAX기반의 무선 메쉬 네트워크에서 QoS 라우팅 프로토콜이 필요한 이유를 설명한다. 그리고 나서 단말과 게이트웨이 사이를 왕복하는 트래픽의 QoS를 보장하는 테이블 관리 방식 홉 간 QoS 라우팅 프로토콜을 제안한다. 성능평가를 위한 시뮬레이션은 제안하는 라우팅 프로토콜이 QOLSR 프로토콜에 비하여 단대단 지연(end-to-end delay)이 낮고, 패킷 전달률(Packet Delivery Ratio)이 높으며, 라우팅 오버헤드 패킷 량을 줄일 수 있음을 보여준다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권5호
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• pp.1642-1661
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• 2015

Wireless mesh networks are a special type of broadcast networks which cover the qualifications of both ad-hoc as well as infrastructure mode networks. These networks offer connectivity to the last mile through hop to hop communication and by comparatively reducing the cost of infrastructure in terms of wire and hardware. Channel assignment has always been the focused area for such networks specifically when using non-overlapping channels and sharing radio frequency spectrum while using multiple radios. It has always been a challenge for mesh network on impartial utilization of the resources (channels), with the increase in users. The rational utilization of multiple channels and multiple radios, not only increases the overall throughput, capacity and scalability, but also creates significant complexities for channel assignment methods. For a better understanding of research challenges, this paper discusses heuristic methods, measurements and channel utilization applications and also examines various researches that yield to overcome this problem. Finally, we highlight prospective directions of research.

• 한국위성정보통신학회논문지
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• 제9권1호
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• pp.45-50
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• 2014

본 논문에서는 한 도시(원주시)를 대상으로 안정적이면서 높은 경제 절감 효과를 얻을 수 있는 광대역 무선 Smart-city형 네트워크 커버리지를 제안하고자 한다. 이를 위하여 해당 지역에 대한 사전 지리적 조사를 실시하고 환경에 적합한 장비를 선택하여 네트워크망의 추가 및 복구가 쉬운 무선 메쉬 네트워크망을 설계하였고 시뮬레이션을 통해 기존에 구축되어 있는 네트워크망과 그 성능을 비교, 평가하고 고찰하였다. 본 논문이 추구하는 목표는 연구를 통해 무선 메쉬 네트워크의 경비 절감 효과 및 우수한 성능을 평가받고 이를 활용하여 그린 IT의 기초가 될 수 있는 미래지향적 도심 통합 네트워크를 제안하는데 있다.