• Title/Summary/Keyword: telecommunications network

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An Algorithm for Performance Index of Telecommunications Network

  • Shin, YongYeon;Lee, SoYeon;Koh, JaiSang
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.2 no.2
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    • pp.111-123
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    • 1998
  • Performance index is a measure of telecommunications network integrating reliability and capacity simultaneously. This paper suggests a computerized algorithm evaluating a performance index for telecommunications network and compares this computerized algorithm with the algorithm[1] by experimenting on several benchmarks. A computerized algorithm proposed by this paper is superior to the algorithm[1] with respect to the computation time for most of the benchmarks.

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Ultra-low-latency services in 5G systems: A perspective from 3GPP standards

  • Jun, Sunmi;Kang, Yoohwa;Kim, Jaeho;Kim, Changki
    • ETRI Journal
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    • v.42 no.5
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    • pp.721-733
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    • 2020
  • Recently, there is an increasing demand for ultra-low-latency (ULL) services such as factory automation, autonomous driving, and telesurgery that must meet an end-to-end latency of less than 10 ms. Fifth-generation (5G) New Radio guarantees 0.5 ms one-way latency, so the feasibility of ULL services is higher than in previous mobile communications. However, this feasibility ensures performance at the radio access network level and requires an innovative 5G network architecture for end-to-end ULL across the entire 5G system. Hence, we survey in detailed two the 3rd Generation Partnership Party (3GPP) standardization activities to ensure low latency at network level. 3GPP standardizes mobile edge computing (MEC), a low-latency solution at the edge network, in Release 15/16 and is standardizing time-sensitive communication in Release 16/17 for interworking 5G systems and IEEE 802.1 time-sensitive networking (TSN), a next-generation industry technology for ensuring low/deterministic latency. We developed a 5G system based on 3GPP Release 15 to support MEC with a potential sub-10 ms end-to-end latency in the edge network. In the near future, to provide ULL services in the external network of a 5G system, we suggest a 5G-IEEE TSN interworking system based on 3GPP Release 16/17 that meets an end-to-end latency of 2 ms.

Interworking technology of neural network and data among deep learning frameworks

  • Park, Jaebok;Yoo, Seungmok;Yoon, Seokjin;Lee, Kyunghee;Cho, Changsik
    • ETRI Journal
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    • v.41 no.6
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    • pp.760-770
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    • 2019
  • Based on the growing demand for neural network technologies, various neural network inference engines are being developed. However, each inference engine has its own neural network storage format. There is a growing demand for standardization to solve this problem. This study presents interworking techniques for ensuring the compatibility of neural networks and data among the various deep learning frameworks. The proposed technique standardizes the graphic expression grammar and learning data storage format using the Neural Network Exchange Format (NNEF) of Khronos. The proposed converter includes a lexical, syntax, and parser. This NNEF parser converts neural network information into a parsing tree and quantizes data. To validate the proposed system, we verified that MNIST is immediately executed by importing AlexNet's neural network and learned data. Therefore, this study contributes an efficient design technique for a converter that can execute a neural network and learned data in various frameworks regardless of the storage format of each framework.

PMD compensator using DOP as Penalty signal (DOP를 이용한 1차 PMD 보상 장치)

  • Seo Jae-Eun;Kim Sang-In;Jeong Ki-Tae;Song Gil-Ho
    • 한국정보통신설비학회:학술대회논문집
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    • 2002.08a
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    • pp.140-141
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    • 2002
  • 본 논문에서는 degree of polarization (DOP)을 편광모드분산의 간접적인 측정수단으로 사용하는 1차 편광모드분산 보상 장치의 개발을 보고한다. 개발된 장치를 이용한 10Gb/s의 전송 속도에 대한 성공적인 편광모드분산 보상 실험 결과를 보고한다. 현재 개발된 장치의 응답속도는 약 1.5초이며 이는 DOP 측정 장비의 속도에 의해서 제약된다.

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Network Selection Algorithm Based on Spectral Bandwidth Mapping and an Economic Model in WLAN

  • Pan, Su;Zhou, Weiwei;Gu, Qingqing;Ye, Qiang
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.1
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    • pp.68-86
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    • 2015
  • Future wireless network aims to integrate different radio access networks (RANs) to provide a seamless access and service continuity. In this paper, a new resource denotation method is proposed in the WLAN and LTE heterogeneous networks based on a concept of spectral bandwidth mapping. This method simplifies the denotation of system resources and makes it possible to calculate system residual capacity, upon which an economic model-based network selection algorithm is designed in both under-loaded and over-loaded scenarios in the heterogeneous networks. The simulation results show that this algorithm achieves better performance than the utility function-based access selection (UFAS) method proposed in [12] in increasing system capacity and system revenue, achieving load balancing and reducing the new call blocking probability in the heterogeneous networks.

Joint Opportunistic Spectrum Access and Optimal Power Allocation Strategies for Full Duplex Single Secondary User MIMO Cognitive Radio Network

  • Yue, Wenjing;Ren, Yapeng;Yang, Zhen;Chen, Zhi;Meng, Qingmin
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.10
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    • pp.3887-3907
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    • 2015
  • This paper introduces a full duplex single secondary user multiple-input multiple-output (FD-SSU-MIMO) cognitive radio network, where secondary user (SU) opportunistically accesses the authorized spectrum unoccupied by primary user (PU) and transmits data based on FD-MIMO mode. Then we study the network achievable average sum-rate maximization problem under sum transmit power budget constraint at SU communication nodes. In order to solve the trade-off problem between SU's sensing time and data transmission time based on opportunistic spectrum access (OSA) and the power allocation problem based on FD-MIMO transmit mode, we propose a simple trisection algorithm to obtain the optimal sensing time and apply an alternating optimization (AO) algorithm to tackle the FD-MIMO based network achievable sum-rate maximization problem. Simulation results show that our proposed sensing time optimization and AO-based optimal power allocation strategies obtain a higher achievable average sum-rate than sequential convex approximations for matrix-variable programming (SCAMP)-based power allocation for the FD transmission mode, as well as equal power allocation for the half duplex (HD) transmission mode.

Ambitious and Challenging Targets for New Generation Network

  • Tran, Minh Anh;Bui, Trung Hieu;Nguyen, Chien Trinh;Bui, Thi Minh Tu
    • IEIE Transactions on Smart Processing and Computing
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    • v.5 no.3
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    • pp.185-192
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    • 2016
  • Today, the Internet has penetrated almost all the ins and outs of social life, has changed work, communications, social influence and the lifestyle of humankind. However, it is still short of flexibility, transparency etc., due to network address translator overuse, masschanges, uncomfortable protocols, and so on. Hence, more research is necessary into future telecommunications networks based on contemporary networks accompanied by new requisitions and new designs that are compatible with today's and tomorrow's demands. This paper researches a new vision of the telecommunication network of the future, its effects on human life and society, and the targets to achieve a new generation network (NwGN). In the paper, we also propose orientation towards an NwGN from the current networks, especially with Vietnam's telecommunications networks.

Study on the return loss of E-PON optical line (E-PON 광선로망에 있어서의 반사손실 영향분석)

  • Kim, Bo-Gyeom;Choe, Yeong-Bok;O, Ho-Seok;Lee, Won-Hyeong;Park, Tae-Dong
    • 한국정보통신설비학회:학술대회논문집
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    • 2005.08a
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    • pp.35-37
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    • 2005
  • 본 논문은 FTTH 의 본격적인 사업에 앞서 순수한 광선희망에서의 반사손실의 영향을 파악하고 문제점 도출 및 해결방안을 찾고자 시스템적인 요소를 제외하고 시험을 하였다. E-PON 광선로망의 반사손실 측정값을 위하여 1 단분기(1*32)에서의 SC/PC, SC/APC, 2 단분기(1*4/1*8)에서의 SC/PC, SC/APC 의 4 가지 형태로 구성하여 측정하였고 SC/PC 커넥터 사용시 단자내가입자단의 공기중에 노출되는 채널수가 많을수록 일정한 패턴을 보이며 반사손실 특성이 저하되었다.

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Vertical Handoff Decision Algorithm combined Improved Entropy Weighting with GRA for Heterogeneous Wireless Networks

  • Zhao, Shasha;Wang, Fei;Ning, Yueqiang;Xiao, Yi;Zhang, Dengying
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.14 no.11
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    • pp.4611-4624
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    • 2020
  • Future network scenario will be a heterogeneous wireless network environment composed of multiple networks and multimode terminals (MMT). Seamless switching and optimal connectivity for MMT among different networks and different services become extremely important. Here, a vertical handoff algorithm combined an improved entropy weighting method based on grey relational analysis (GRA) is proposed. In which, the improved entropy weight method is used to obtain the objective weights of the network attributes, and GRA is done to rank the candidate networks in order to choose the best network. Through simulation and comparing the results with other vertical handoff decision algorithms, the number of handoffs and reversal phenomenon are reduced with the proposed algorithm, which shows a better performance.

Distributed memory access architecture and control for fully disaggregated datacenter network

  • Kyeong-Eun Han;Ji Wook Youn;Jongtae Song;Dae-Ub Kim;Joon Ki Lee
    • ETRI Journal
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    • v.44 no.6
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    • pp.1020-1033
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    • 2022
  • In this paper, we propose novel disaggregated memory module (dMM) architecture and memory access control schemes to solve the collision and contention problems of memory disaggregation, reducing the average memory access time to less than 1 ㎲. In the schemes, the distributed scheduler in each dMM determines the order of memory read/write access based on delay-sensitive priority requests in the disaggregated memory access frame (dMAF). We used the memory-intensive first (MIF) algorithm and priority-based MIF (p-MIF) algorithm that prioritize delay-sensitive and/or memory-intensive (MI) traffic over CPU-intensive (CI) traffic. We evaluated the performance of the proposed schemes through simulation using OPNET and hardware implementation. Our results showed that when the offered load was below 0.7 and the payload of dMAF was 256 bytes, the average round trip time (RTT) was the lowest, ~0.676 ㎲. The dMM scheduling algorithms, MIF and p-MIF, achieved delay less than 1 ㎲ for all MI traffic with less than 10% of transmission overhead.