• Title/Summary/Keyword: 무선통신의 신뢰성 향상

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Reliable Data Transmission using Path-Reliability with Selective, Implicit Acknowledgement (경로별 신뢰도에 따른 선택적, 묵시적 응답을 사용하는 신뢰성있는 데이터 전송 방법)

  • Lee, Ga-Won;Han, Seung-Min;Kim, Kyu-Jin;Huh, Eui-Nam
    • Proceedings of the Korea Information Processing Society Conference
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    • 2009.04a
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    • pp.1300-1302
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    • 2009
  • 인간 생활의 질적인 향상을 위해, 각종 시스템이 연구되고 있다. 특히 작고 설치가 용이한 센서를 중심으로 Ubiquitous 분야가 발달하고 있으며, 센서 네트워크에 대한 연구가 활발히 진행되고 있다. 특히 일반적인 생활에는 물론 의료, 노약자의 보호, 위험 감지 등의 중요한 분야에까지 센서 네트워크가 활용됨으로써 데이터 전송의 정확성과 신뢰성은 중요한 문제로 대두되었다. 이에 본 논문에서는, 센서의 특성과 무선 통신의 특징을 고려하여 에너지 효율성 및 데이터 전송의 신뢰성을 향상시키기 위한 방법을 제시하고자 한다. 특히 RSSI 신호와 채널 에러율을 함께 이용하여 각 노드 경로별 신뢰도를 계산하고, 이에 따라 선택적으로 Acknowledgement를 사용하며 오버히어링 문제를 역으로 이용하여, 묵시적 Acknowledgement로 사용함으로써 에러율이 높고 에너지가 한정되어있는 무선 센서 네트워크에서 계속적인 ACK/NACK 사용으로 인한 에너지 소비 및 트래픽 낭비를 줄이고자 한다.

Performance Analysis of Relay-Based Shipboard Wireless Communication Systems (릴레이 기반 선내 무선통신 시스템의 성능 분석)

  • Joo, Yang-Ick;Kim, Beom-Mu;Jeong, Min-A;Lee, Seong Ro
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.1
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    • pp.202-208
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    • 2015
  • A wireless ship area network is required to configure and control various sensors and electrical instruments embedded or boarded in a ship. In such environment, wireless communication protocol adopting relaying function is needed because direct link or communication between two nodes is hardly guaranteed due to spatial constraints in a ship. In this study, we introduce and analyze a WiMedia Distributed MAC (D-MAC) based approach considering throughput and energy constraint of wireless communication module. Performance evaluation results demonstrate that the relay-based wireless communication protocol improves reliability of wireless communication network in a ship.

Interference-Free Multipath Routing Protocol for M2M Wireless Network to Enhance Packet Delay Performance (M2M 무선 네트워크에서 패킷 지연 성능 향상을 위한 간섭 회피 다중 경로 라우팅 기법)

  • Heo, Hyeong-Min;Hwang, Jun-Ho;Yoo, Myung-Sik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.12B
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    • pp.1259-1266
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    • 2010
  • M2M communication is considered as a key enabling technology to monitor the status of objects, vehicles, humans through auto-configuring wireless networks. In M2M network, there are active research activities to enhance the reliability on data while being collected from wireless sensor network. The reliability issue becomes more important as wireless sensor networks carry multimedia data, which is delay sensitive. The interference caused by the adjacent neighbor sensor nodes is a major factor in network performance degradation, which becomes more severe in multi-hop routing environment. In this paper, we propose inerfernce-free multipath routing protocol for M2M wireless network for enhancement of packet delay performance. The simulation results show that the proposed routing algorithm outperforms the existing routing protocols in terms of packet delay and throughput.

Research on Performance Improvement for Wireless CCN (무선 CCN을 위한 성능향상에 대한 연구)

  • Lee, Seung-Jin;Bae, Hong-Min;Kim, Byung-Seo
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.15 no.2
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    • pp.71-76
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    • 2015
  • To resolve inefficient content delivery mechanism in conventional internet-based networks, Content-Centric Networks (CCN) has been proposed for wired and wireless networks. One of issues in wireless CCN-based networks is overhead to achieve reliability on content delivery because CCN uses end-to-end two-way handshake with Interest/content packets. In this paper, a novel protocol to reduce overhead and achieve reliability is proposed. The protocol allows Interest packet to request multiple data packets and multiple data packets to be sent in a row without a Interest packets. The protocol is evaluated through the simulations and the performance improvement is proved.

Inter-Cell Cooperative Transmission Scheme for Improving Reliability at the Heterogeneous Network (이종 네트워크 환경에서 신뢰성 향상을 위한 인접 셀 간 협력 전송 기법)

  • Kang, Sung-jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.10
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    • pp.1931-1933
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    • 2015
  • This paper proposes inter-cell cooperative transmission scheme in order to improve the reliability of the wireless communication system at the heterogeneous network environments. The heterogeneous network can increase data rate by using existing network technologies. However, degradation of communication performance in the cell edge has been a serious problem. Therefore, this letter proposes an adaptive transmission scheme according to the diverse situations in order to solve this problem.

A Reliable Protocol for Real-time Monitoring in Industrial Wireless Sensor Networks (산업 무선 센서 네트워크에서 실시간 모니터링을 위한 신뢰성 향상 기법)

  • Oh, Seungmin;Jung, Kwansoo
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.10 no.5
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    • pp.424-434
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    • 2017
  • In industrial wireless sensor networks, many applications require integrated QoS supporting. This paper proposes a reliable protocol for real-time monitoring in industrial wireless sensor networks. Retransmission is well-known to recover the transmission failure, however, this might cause the time delay to violate the real-time requirement. The proposed protocol exploits broadcasting feature of wireless networks and the temporal opportunity concept. The opportunities to relay the data packets are shared by the broadcasting feature and the temporal opportunity concept maximize the number of candidates in communication. Simulation results show that the proposed protocol is superior to the existing real-time protocols in term of real-time service and reliability.

소출력 무선설비 관리제도 개선 방향

  • 여경진;윤세정;염호선;류충상
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.4
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    • pp.13-23
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    • 2001
  • Recently, the demands on the short range radio device has been highly increasing, with the advantage of its mobility and improvement of its reliability which has been ensured by development of digital communication techniques. This study suggests the direction for the improvement of the national regulations in the technical, administrative and regulatory aspects, discussing the present situation of the regulations. While suggesting to launch the study on spectrum source and RE environments, we expect that several proposals in this paper will give a satisfaction on the development of strategy for spectrum management, development of radio technology and booming the short range radio communication.

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A WSN Routing Algorithm for Improving the Reliability of Directed Diffusion (Directed Diffusion 기반의 신뢰성 향상을 위한무선 센서 네트워크 라우팅 알고리즘)

  • Kim, Yong-Pyo;Jung, Eui-Hyun;Park, Yong-Jin
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.47 no.2
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    • pp.39-47
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    • 2010
  • In Wireless Sensor Network, transmission errors are frequently occurred due to the node failure, battery discharge, and interference by objects. Although Directed Diffusion has been considered as a prominent Data-centric routing algorithm, it revealed some weaknesses at this kind of unexpected network errors. In order to address the problem, we proposed a radio-aware routing algorithm for improving reliability of Directed Diffusion in Wireless Sensor Networks. The proposed algorithm is aware of the network status based on the radio information of MAC and PHY layers using a cross-layer approach. The link quality and the node failure information from the acquired network status were used to decide an alternative path to provide a reliable data transmission in error-prone sensor networks. The proposed algorithm showed its effectiveness of the data delivery rate and data ratio with several simulations consisting of various error rates and the number of nodes.

Comparison Study of Interoperability of Railway Wireless Communication Networks (철도 무선통신망 연동방안 비교)

  • Cho, Woong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.8
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    • pp.729-734
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    • 2016
  • The current domestic railway wireless communication networks transmit and receive data using several communication schemes such as VHF, TRS-ASTRO, and TRS-TETRA depending on the specific region. Recently, LTE scheme has been adopting in railway wireless communication systems to provide various services and increase reliability. It is critical to support the network interoperability between the existing communication schemes and new communication scheme for seamless data transmission. In this paper, we propose two interoperability schemes in railway communications networks, i.e., network oriented scheme and terminal oriented scheme. We consider the operation scenario for each scheme and compare two interoperability schemes. The practical implementation issues are also discussed based on suggested schemes.

Performance Measurement of LTE based Railway Wireless Communication Systems in the Testbed (테스트베드상에서 LTE기반 철도 무선통신시스템의 성능 측정)

  • Kim, Bum-Gon;Kwon, Byung-Hee;Cho, Han-Byeog;Cho, Woong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.5
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    • pp.755-762
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    • 2017
  • In railway communication, LTE based railway wireless communication systems have been developed to support high data rate and reliable communication link. In this paper, the testbed of LTE based railway wireless communication systems is introduced. Then, we describe measurement results of communication performance such as radiation strength, communication coverage, call setup time, handover success rate, and data transmission rate in the testbed. We also consider requirements for commercialization based on measurement results.