• Title/Summary/Keyword: Communication Protocol

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Implementation of Linux RTAI Open CNC System Based on EtherCAT Network (EtherCAT 네트워크 기반 리눅스 RTAI 개방형 CNC 시스템 구현)

  • Park, Sung-Mun;An, Cheol-Jin;Kim, Hyoungwoo;Yi, Hyun-Chul;Choi, Joon-Young
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.10
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    • pp.977-981
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    • 2015
  • We propose a method for the implementation of an EtherCAT communication bus in a Linux-based open source Computerized Numerical Control (CNC) system. Recently, increasingly more CNC systems support real-time Ethernet protocols such as EtherCAT, which is a high-performance industrial communication protocol. For real-time CNC control over an Ethernet-based protocol, an additional layer driver needs to be implemented between the CNC system and the master of industrial communication protocol. Among the various solutions for the connection layer driver, we employ a Hardware Abstraction Layer (HAL) driver based on Linux. The operation of the implemented CNC system is demonstrated and confirmed by Hal Meter, which is used to observe the pins, signals, or parameters of HAL.

A Reactive Routing Scheme based on the Prediction of Link State for Communication between UAV Squadrons in a Large-Scale FANET (대규모 FANET에서 UAV 편대간 통신을 위한 링크 상태 예측에 기반한 반응적 라우팅 기법)

  • Hwang, Heedoo;Kwon, Oh Jun
    • Journal of Korea Multimedia Society
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    • v.20 no.4
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    • pp.593-605
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    • 2017
  • In applications which are covered wide range, it is possible that one or more number of Unmanned Aerial Vehicle(UAV) squadrons are used to perform a mission. In this case, it is most important to communicate seamlessly between the UAV squadrons. In this paper, we applied the modified OLSR(OSLR-Pds) which can prediction for state of the link for the communication in UAV squadron, and applied the modified AOMDV which can build multi-path for the communication between UAV Squadrons. The mobility of nodes are modeled using Gauss-Markov algorithm, and relative speed between nodes were calculated by derive equation of movement, and thereby we can predict link state for in a squadron and between squadrons. An experiment for comparing AODV, AOMDV and the proposed routing protocol was conducted by three factors such as packet delivery ratio, end to end delay, and routing overhead. In experiment result, we make sure that the proposed protocol performance are superior in these three factors. However, if the density of the nodes constituting FANET are too low, and if the moving speed of node is very slow, there is no difference to others protocols.

The Implementation of Communication Protocol for Semiconductor Equipments with Priority of Data Traffic (데이터 트래픽의 우선 순위를 갖는 반도체 장비 통신 프로토콜 구현)

  • Kim, Doo Yong;Kim, Kiwan;Cho, Hyun Chan
    • Journal of the Semiconductor & Display Technology
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    • v.11 no.4
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    • pp.13-18
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    • 2012
  • The semiconductor equipments generate a lot of data traffic via communication channels for the effective manufacturing processes of semiconductors and for the automation of semiconductor equipments. These data should be sent to a host computer in order to keep in a safe. The IEEE 802.11e specification gives differentiated and distributed access to a wireless communication medium with four access categories. These four access categories use different priority parameters which lead to quality of service in data traffic. In this paper, it is shown that the throughput of data depends upon the priority parameters provided by IEEE802.11e. We implement the usage of priority parameters in the SECS protocol for semiconductor equipments. It is necessary that the data from semiconductor equipments should be classified with certain priority for the effective use of our proposed method. Therefore, our scheme will contribute to improving the performance of the manufacturing processes of semiconductors.

Simple Bidirectional Transmission Protocols Cooperative Transmission using Network Coding and Digital Fountain Codes (네트워크 코딩 및 디지털 파운 테인 코드를 사용하여 간단한 양방향 전송 프로토콜)

  • Kong, Hyung-Yun
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.13 no.4
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    • pp.23-28
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    • 2013
  • In this paper, we propose a simple bidirectional transmission protocol using network coding and digital Fountain codes. In particular, in the proposed scheme, two sources use digital Fountain codes to transmit their message to each other with the help of relays. Then, relays use Fountain codes and network coding to forward the source messages to both sources. To evaluate performance of the proposed protocols, we present the average total throughput over Rayleigh fading channels via Various Monte-Carlo simulations. Results show that the proposed protocol outperforms the two-way relaying transmission protocol without using network coding technique at high SNR region.

A MAC Protocol for Integrated Service in the Multi-Hop Ad-Hoc Maritime Communication Network (다중 홉 해양통신망에서 실시간 통합 서비스를 위한 MAC 프로토콜)

  • Cho, Kumin;Yun, Changho;Lim, Yong-Kon;Kang, Chung G.
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.7
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    • pp.603-611
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    • 2013
  • In this paper, we propose a new frame structure and the underlying dynamic resource control mechanism to support an integrated service, including a real-time (RT) service that requires to serve the end-to-end delay performance, as well as non-real-time (NRT) service, using Self-Organizing Time Division Multiple Access (SO-TDMA)-based MAC protocol in a multi-hop ad-hoc maritime communication network. The underlying frame structure is dynamically configured by resource allocation to guarantee the average target outage performance of the real-time service. Toward this end, we analyze the average outage probability and its performance is verified for the proposed frame structure by simulation.

Efficient and Secure Routing Protocol forWireless Sensor Networks through SNR Based Dynamic Clustering Mechanisms

  • Ganesh, Subramanian;Amutha, Ramachandran
    • Journal of Communications and Networks
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    • v.15 no.4
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    • pp.422-429
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    • 2013
  • Advances in wireless sensor network (WSN) technology have enabled small and low-cost sensors with the capability of sensing various types of physical and environmental conditions, data processing, and wireless communication. In the WSN, the sensor nodes have a limited transmission range and their processing and storage capabilities as well as their energy resources are limited. A triple umpiring system has already been proved for its better performance in WSNs. The clustering technique is effective in prolonging the lifetime of the WSN. In this study, we have modified the ad-hoc on demand distance vector routing by incorporating signal-to-noise ratio (SNR) based dynamic clustering. The proposed scheme, which is an efficient and secure routing protocol for wireless sensor networks through SNR-based dynamic clustering (ESRPSDC) mechanisms, can partition the nodes into clusters and select the cluster head (CH) among the nodes based on the energy, and non CH nodes join with a specific CH based on the SNR values. Error recovery has been implemented during the inter-cluster routing in order to avoid end-to-end error recovery. Security has been achieved by isolating the malicious nodes using sink-based routing pattern analysis. Extensive investigation studies using a global mobile simulator have shown that this hybrid ESRP significantly improves the energy efficiency and packet reception rate as compared with the SNR unaware routing algorithms such as the low energy aware adaptive clustering hierarchy and power efficient gathering in sensor information systems.

An Improved Algorithm for Performance Evaluation of Communication Protocol Using Extended Timed Petri Nets (확장된 Timed Petri Net을 이용한 통신 프로토콜의 성능분석 알고리즘)

  • 이철희;이상호;김홍식
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.14 no.3
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    • pp.197-206
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    • 1989
  • In this paper, we represent an improved algorithm of performance evaluation for communication protocol. It is an algorithm that analyzes Extended Timed Perti Net models including time which have been successfully used to model and evaluate the performance of distributed system. While Timed Petri Nets generally limted to free-choice and safe nets, our algorithm permits the construnction of elegant models of restricted concurrent processing. Furthermore, to reduce the state space size of Timed Reachability Graph, we improve the algorithm by using Maximum Firing Rule and sets of simultaneously firing transitions. Procedures for constructing of Timed Reachability Graphs and analyzing are presented, and we demonstrate the usefulness of this algorithm by applying it to the analysis of the communication protocol.

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Design of System for Control of Surveillance Camera with the Zigbee (Zigbee Protocol을 이용한 감시용 Camera Control System 설계)

  • Min, Chol;Kim, Young-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.939-942
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    • 2005
  • According to a diversification of surveillance camera function, they have got to control the surveillance camera utilizing the controller or personal computer. The Method of solution is wired communications and wireless communications. But wired communications are a weak point because that need to use another cable and in case of communication system utilizing the Bluetooth universalized, there is the difficulty in the utility because electricity consumption is big. But the wireless communication utilizing the zigbee protocol is that electiricity consumption is more small than Bluetooth and reliability of data transmission is better. Therefore I designed system for control of surveillance camera with Zigbee protocol.

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A Study of Protocol comparison Analysis for MPLS Traffic Engineering (MPLS 트래픽 엔지니어링을 위한 프로토콜 비교 분석에 관한 연구)

  • Ha, Yun-Sik;Kim, Dong-Il;Choi, Sam-Gil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.105-108
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    • 2005
  • To support abruptly increasing data traffic in these days. network management is needed. And also to maintain the steady infra, there is MPLS need which can support traffic engineering. It's necessary that MPLS doesn't only manage network to support recently booming data traffic, but has capacity to support traffic engineering to keep static infrastructure. Traffic engineering, method that a large-scale user shifts traffic to the beforehand designated routes that pass through specific nodes on network, is operation that is mapping traffic flow to the physical network topology. In this paper, we supplement the defect of the traditional RSVP traffic engineering and to construct far more steady infra, we suggest the way of its development of ERSVP signaling protocol.

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A Study on Implementation of IRIG-B Protocol for Time Synchronization of IEC 61850 based Merging Unit (IEC 61850 기반 병합단위장치의 시간 동기화를 위한 IRIG-B 프로토콜 구현에 관한 연구)

  • Kim, Gwan-Su;Lee, Hong-Hee;Kim, Byung-Jin
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.4
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    • pp.303-310
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    • 2008
  • Recently, IEC 61850 supports the standardized communication technique in both station bus and process bus, and presents substation automation model. In order to implement the IEC 61850 based communication in a substation using the MU (merging unit) which is one of the important data acquisition equipments in substation automation, the time synchronization is demanded for cooperative operation between the devices. This paper proposes the precision time synchronization technique using IRIG-B protocol to develop the MU under IEC 61850 communication protocol. The proposed technique is implemented and its performance is verified experimentally.