• Title/Summary/Keyword: 데이터링크 프로토콜

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Design and Performance Analysis of CDMA Radio Link Protocols for QoS Control of Multimedia Traffic (멀티미디어 트랙픽의 QoS 지원을 위한 CDMA 무선데이터링크 프로토콜 설계 및 성능분석)

  • 조정호;이형옥;한승완
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.4A
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    • pp.451-463
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    • 2000
  • In this paper, we design the radio data link protocols with QoS provisioning for mobile multimedia such as voice, data, and video in CDMA-based ATM networks, and analyze the performance of the data link protocols. To support mobile multimedia traffic, the required QoS parameters and the characteristics are analyzed, and wireless protocol stacks are proposed for integrating the wireless access network and ATM transport networks, and radio data link protocols are designed for provisioning QoS Control. The data link protocols are analyzed assuming that the system is supporting voice and data traffic simultaneously. In case of data traffic, the delay and throughput of SREJ ARQ and Type-1 Hybrid ARQ scheme are compared, and in case of voice traffic, the packet loss rate of BCH coding is analyzed according to the varying data traffic loads. The results indicate that the adaptive radio link protocols are efficient to support QoS requirements while the complexities are increased.

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Performance Analysis of Data Link Protocol for Interface between EIS and LDTS (전자연동장치와 역정보전송장치간 인터페이스를 위한 데이터링크 프로토콜 성능해석)

  • Hwang, Jong-Gyu;Lee, Jae-Ho
    • Journal of the Korean Society for Railway
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    • v.6 no.2
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    • pp.135-141
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    • 2003
  • According to the computerization of railway signaling systems, the interface link between these signaling equipment is also replaced by digital communication channel, expecially communication link for interface between EIS and LDTS, but there are some problems in the present state of railway signaling. First of all, different communication protocol is applied to interface between above two signaling equipment although they have same functions. The other is that the communication protocol currently used in railway field has some unreasonable points such as structure, formation of byte, error correction scheme and etc. To solve these problems, the standard communication protocol for railway signaling is designed. The structure of designed communication protocol and the results of performance analyses are represented in this paper. It will be expected the increase of safety, reliability and efficiency of maintenance of signaling system by using of the designed communication protocol for railway signaling.

A Study on Network Operation Structure and DataLink Protocol for Interworking of Ground Network ALL-IP at Next-Military Satellite Communication (차기군위성통신에서 지상망 ALL-IP 연동을 위한 네트워크 운용구조 및 데이터링크 프로토콜 연구)

  • Lee, Changyoung;Kang, Kyungran;Shim, Yong-hui
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.6
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    • pp.826-841
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    • 2018
  • The military satellite communication of ROK military, ANASIS is designed for analog data such as voice and streaming data. ANASIS cannot fully support ALL-IP communications due to its long propagation delay. The next generation satellite communication system is being designed to overcome the limitation. Next generation satellite communications system considers both high-speed and low-speed networks to support various operating environment. The low-speed satellite supports both broadband and narrow-band communication. This network works as the infrastructure for of wide-area internetworking over multiple AS's in the terrestrial network. It requires minimum satellite frequency and minimum power and works without PEP and router. In this paper, we propose a network operation structure to enable the inter-operation between high and low-speed satellite networks. In addition, we propose a data link protocol for low speed satellite networks.

OCTOPUS : 다중링크상태분석기

  • Lee, Geun-U
    • ETRI Journal
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    • v.14 no.3
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    • pp.16-30
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    • 1992
  • SMX-1 시스팀과 같이 다수의 신호링크들이 운용되면서 신호망의 시험 및 운용이 이루어질 때 부분적인 분석 검증이 아닌 시스팀의 전반적인 검증에서부터 망차원에서의 동작여부를 판단하여 시스팀을 수정, 보완해가야 할 필요성이 있다. 그러나, 범용의 링크상태분석기를 사용하는 것은 한정된(1 또는 2 링크)신호링크만을 제공하기 때문에 다수의 신호링크에 대한 실시간 상태분석을 할 수 없는 점, 이미 정해진 메시지만을 추출/검색할 수 있기때문에 사용자가 원하는 형태의 니모닉 검색/추출이 되지 않는 기능상의 미비점, 다수의 신호링크를 제공하기 위해서 고가의 링크상태 분석기를 여러대 구입하는 것은 중복구매로 인한 예산문제 등 많은 문제점들이 있다. OCTOPUS는 이러한 문제점들을 해결하기위해 제안된 다중링크상태분석기로서, 상태분석시 다수의 신호링크를 제공할 수 있고, 사용자가 원하는 형태의 니모닉 검색/추출이 가능하며, SMX-1 연구결과인 부산물을 이용한다는 측면과, No. 7 레벨2 프로토콜을 이용한 레벨2 비가용원인이유 파악기능제공, 유사한 형태의 HDLC(데이터링크 프로토콜) 처리기능등을 제공할 수 있다는 것이 장점이다. OCTOPUS의 하드웨어는 자체 개발된 SMX-1시스팀의 하드웨어를 사용하며 그위에 링크상태 분석기용 소프트웨어를 탑재하게 된다.

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Design of VDL Mode 2 Protocol under AOA Network for the Implementation of Bit-oriented ATS Applications (AOA망 환경에서 ATS 애플리케이션 구현을 위한 VDL Mode 2 데이터링크 프로토콜 설계)

  • Bae, Joong-won;Kim, Hyoun-kyoung;Kim, In-kyu;Kim, Tae-sik;Kim, Dong-min
    • Journal of Aerospace System Engineering
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    • v.1 no.4
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    • pp.13-21
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    • 2007
  • As one of YHF digital data link technologies, VDL Mode 2 is designed to be an air-to-ground subnetwork of the Aeronautical Telecommunication Network (ATN) based on the Open System Interconnection (OSI) architecture. VDL Mode 2 can be used in ATS Applications especially for CPDLC and ADS. And it is also expected to replace ACARS (Aircraft Communications Addressing and Reporting System) which has broadly been used in AOC for over 20 years. This paper presents the design result of VDL Mode 2 system under AOA (ACARS Over AVLC) environment for the implementation of bit-oriented ATS applications. The system is composed of airborne and ground subsystem. Airborne subsystem consists of VDR, CMU and an aircraft test equipment with CPDLC/ADS client applications for operational test and ground system consists of Ground Station which includes ground VDR and ground communication controller, simple DSP (Datalink Service Processor) and a ground test equipment with CPDLC/ADS server applications.

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A Study on Performance Improvement of Communication Protocol for Railway Signalling (철도신호용 통신 프로토콜 구조 분석 및 성능개선)

  • 황종규;이재호
    • Proceedings of the Korean Information Science Society Conference
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    • pp.313-315
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    • 2003
  • 국내 철도신호설비들이 점차 전자화 되어감에 따라 이러한 신호제어장치간 인터페이스를 위한 표준 통신 프로토콜의 필요성이 점점 증대되고 있다. 본 논문에서는 이러한 기존의 철도신호용 프로토콜에 대한 분석을 하였다 그리고 철도신호용의 새로운 프로토콜의 설계를 위한 데이터 링크 프로토콜의 성능평가 모델을 설명하고, 이를 바탕으로 새롭게 설계된 철도신호용 통신 프로토콜에 대한 구조를 제시하고 성능평가 모델에 의한 기존의 프로토콜과 비교분석을 수행하였다. 프로토콜 평가모델에 의한 기존 프로토콜과 설계한 프로토콜의 비교결과 많은 성능개선이 있음을 확인하였다.

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A Study on Automatic Surveillance System using VHF Data Link Protocol (해상이동통신에서 VHF 데이터링크 프로토콜을 이용한 자동감시시스템)

  • 장동원;조평동
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.7
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    • pp.1026-1031
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    • 2002
  • In this Paper, We analysed the technical characteristics of a automatic identification system that will introduce in aviation and marine radio stations. IMO's Marine Safety Committee approved revision of chapter V of the Safety of Life at Sea(SOLAS) Convention in 73rd meeting. According to this, AIS will become a mandatory carriage requirement by 01 July 2002. AIS as a surveillance system continuously receives its own position from the GNSS and then repeatedly broadcasts it on a W:.u data link for avoiding traffic conflicts and possible disasters. VHF data link is organized so that a specified number of time slots make up a repeatable frame. Each radio station can autonomously allocate and deallocate slots within the frame using selection algorithm which is called SOTDMA(Self-Organized Time Division Multiple Access). The results can be an aid in the continued of understanding technical characteristics for AIS as a broad surveillance system.

A Study on Automatic Surveillance System using VHF Data Link Protocol (해상이동통신에서 VHF 데이터링크 프로토콜을 이용한 자동감시시스템 연구)

  • 장동원
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.187-191
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    • 2002
  • In this paper, We analysed the technical characteristics of a automatic identification system that will introduce in aviation and marine radio stations. IMO's Marine Safety Committee approved revision of chapter V of the Safety of Life at Sea(SOLAS) Convention in 73rd meeting. According to this, AIS will become a mandatory carriage requirement by 01 July 2002. AIS as a surveillance system continuously receives its own position from the GNSS and then repeatedly broadcasts it on a VHF data link for avoiding traffic conflicts and possible disasters. VHF data link is organized so that a specified number of time slots make up a repeatable frame. Each radio station can autonomously allocate and deallocate slots within the frame using selection algorithm which is called SOTDMA(Self-Organized Time Division Multiple Access). The results can be an aid in the continued of understanding technical characteristics for AIS as a broad surveillance system.

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Performance Analysis of Adaptive Frame Size Control Scheme in Wireless Networks (무선 통신망에서의 적응 프레임 길이 제어 방식의 성능 분석)

  • Kim, Eung-In
    • 전자공학회논문지 IE
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    • v.47 no.2
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    • pp.54-59
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    • 2010
  • This paper suggests a new data link protocol with an adaptive frame length control scheme for wireless data networks which is subject to errors that occur with time variance. We analyze the proposed scheme under a two-state markov block interference(BI) model. Numerical results show that the proposed scheme can achieve high throughput performance for both dense and diffuse burst noise channels.

A Study on the Transmission Speed Improvement of Sharing Situation Information by Variable Message Protocol

  • Lee, Jeong-Min;Shin, Sang-Heon;Lim, Won-Gi;Kim, Hyeong-Seok;Kim, Yong-Cheol
    • Journal of the Korea Society of Computer and Information
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    • v.26 no.1
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    • pp.135-146
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    • 2021
  • VMP(Variable Message Protocol) is bit-based variable message processing protocol that enables the sharing situation information in real time as a tactical datalink protocol for Korean Army. System A is currently under development and will be operated as an army system when its development is completed. In system A, the VMP processing terminal is mounted and the VMP is utilized for exchanging tactical information. System A can acquire situation information from mounted situation information acquisition system and share situation information with other system A by the VMP. In this paper, we propose a method of sharing situation information with system A and speed improvement methods of sharing situation information using VMP. As speed improvement methods of sharing situation information, this paper studied 'Removing Process of Sending VMP Observation Report', 'Adopting One-time Situation Information Send Button When Sharing A System Situation Information By VMP', 'Combination of Many VMP Messages Using Repeat Function Of Application Header'. And we conducted the experiment, the result was that the transmission speed of equipment to which the research method was applied was improved by 76.8% compared to the existing equipment.