• Title, Summary, Keyword: LTE(Long Term Evolution)

Search Result 279, Processing Time 0.036 seconds

A Study of PCI (Physical Cell Identification) Assignment in LTE (Long Term Evolution) SON (Self-Organization Network) (LTE 자가 구성 네트워크망에서 물리적 셀 ID할당 방법 연구)

  • Yang, Mochan
    • Journal of IKEEE
    • /
    • v.23 no.3
    • /
    • pp.941-946
    • /
    • 2019
  • In this paper, the author analyzed the PCI (Physical Cell Identification) allocation methods in the LTE (Long Term Evolution) SON (Self Organization Network) environment. A variety of techniques have been proposed for how to allocate PCI, and the LTE standard fundamentally explained that collision between a cell and neighbor cells arise while a cell assign the PCI. Therefore, in this paper, the author examined the scenarios of PCI collision, weak collision, and confusion proposed by LTE specification. In addition, the cell central approach and the distributed approach were discussed as solutions for each scenario. In this paper, the author reviewed the approach of graphic coloring technique which was studied recently and explained the strategy of central approach.

Performance evaluation of LTE/LTE-A closed subscriber group femto-cell discovery (LTE/LTE-A 배타적 접속 펨토셀에 대한 검출 성능 평가)

  • Joo, Yang-Ick
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.38 no.4
    • /
    • pp.451-455
    • /
    • 2014
  • In LTE (Long Term Evolution)/LTE-A (Long Term Evolution-Advanced) networks, hierarchical macro/femto-cell structure is adopted to enhance system capacity. Such a femto-cell is deployed as a Closed Subscriber Group (CSG) eNB. However, the inbound handover to CSG cell experiences longer delay than normal handover because it spends more time detecting the associated CSG cells due to its sparse deployment. Most of all the legacy UEs (User Equipments) have been implemented without considering the inbound CSG handover. Accordingly, they may not meet the performance requirements on the cell discovery described in the LTE/LTE-A standards. Therefore, in this paper, the performance of the CSG femto-cell detection is evaluated using computer simulation. The evaluation results will provide a basis to tackle the latency problem of inbound CSG handover.

A Study on the Public Safety Long Term Evolution Disaster Communication Network (PS-LTE 재난안전통신망에 관한 정책 연구)

  • Kang, Heau-Jo
    • Journal of Digital Contents Society
    • /
    • v.16 no.1
    • /
    • pp.43-51
    • /
    • 2015
  • South Korea decided to use the public safety long term evolution (PS-LTE) method to build a wireless communications network for national disaster. The move will allow all disaster management agencies, including police, firefighters and the military to use multimedia information, including videos, in addition to voice to carry out rescue operations from 2017. The Ministry of Science, ICT and Future Planning said Thursday that it adopted PS-LTE as the technology method for national disaster management system following a national policy coordination meeting last month. PS-LTE is a method integrating group communication, direction communication between terminals and independent base station function with existing LTE technology. Until now, disaster management agencies used technology that only allowed voice communication. However, transmission of multimedia information is possible using PS-LTE.

Power-Saving Mechanism Considering Round-Trip Delay in LTE Systems (LTE 시스템에서 양방향 지연을 고려한 전력절감 방식)

  • Choi, Hyun-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.38A no.12
    • /
    • pp.1045-1053
    • /
    • 2013
  • In this paper, we propose a new power-saving mechanism (PSM) for Long-Term Evolution (LTE) systems by considering a round-trip delay between a user equipment (UE) and its correspondence node. The proposed PSM changes the order of the operational procedures of the legacy LTE PSM by taking the traffic arrival pattern suffering the round-trip delay into account. After modeling the round-trip delay, we numerically analyze the proposed PSM with respect to energy consumption and buffering delay. Then, we characterize these performances by employing a simple energy-delay tradeoff (EDT) curve according to the operational parameters. The resulting EDT curve clearly shows that the proposed PSM outperforms the legacy LTE PSM in terms of both the energy consumption and buffering delay.

3G Long-Term Evolution(LTE) 시스템에서의 무선프로토콜 기술

  • Cheon, Seong-Deok;Lee, Seung-Jun;Choe, Jin-Seong
    • Information and Communications Magazine
    • /
    • v.24 no.12
    • /
    • pp.31-38
    • /
    • 2007
  • 본고에서는 현재 3GPP(3rd Generation Partner Project)에서 표준화 작업이 진행중인 LTE(Long Term Evolution) 시스템에서, Layer 2와 Layer 3에 해당되는 무선프로토콜 기술에 대해서 알아본다.

Trends of Railway Communication Services based on LTE-R (LTE-R 기반 철도 통신 서비스 동향)

  • Kim, Young-Dong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • /
    • pp.864-867
    • /
    • 2016
  • In high speed railway system, LTE(Long Term Evolution) based LTE-R(LTE-Railray) mobile technology is used to supply various control signal required for safty operation of train. In this paper, railway communication technology be used in railway communication system based on LTE-R is investigated in focused on application services. Standardization trends for LTE-R technology are also considered. Results of this study can be used as basic data for research and development of LTE-R and railway mobile communication.

  • PDF

Standardization Trends of Railway Communication based on LTE-R (LTE-R 기반 철도 통신 표준화 동향)

  • Kim, Young-Dong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • /
    • pp.549-552
    • /
    • 2018
  • One of railway communication technology, LTE(Long Term Evolution) based LTE-R(LTE-Railway) is rapidily adopted to supply various control signal and to supply diverse communication service be needed for safety operation of train. In this paper, railway communication technology and service based on LTE-R is studied. And domestic an international standardization trends of related on railway communications are investigated. Results of this study can be used as basic data for research of railway communication based on LTE-R and development of railway communication systems.

  • PDF

Transmission Performance of Video Traffic on LTE-R Networks (LTE-R 네트워크에서 비디오 트래픽의 전송 성능)

  • Kim, Young-Dong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • /
    • pp.527-530
    • /
    • 2017
  • LTE-R(Long Term Evolution-Railway) based on LTE technology is expected to use core communication technology for high speed railway as one of standards for railway communications. In this paper, transmission performance of video traffic as an application is analyzed on LTE-R networks. Performance is evaluated with compter simulation based NS(Network Simulator)-2, open video traffic is used, RTP(Real Time Protocol) is used for transmission protocol. Results and methods of this paper can be used for research and developmemt of LTE-R networks.

  • PDF

A Study on the Multi-band MIMO Antenna with MD material for Next-generation Mobile Communication (MD 매질을 이용한 차세대 이동통신 단말기용 다중대역 MIMO 안테나 설계 및 구현)

  • Kim, Woo-Su;Yoon, Cheol;Lee, Won-Jong;Kang, Suk-Youb;Park, Hyo-Dal
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.14 no.4
    • /
    • pp.983-990
    • /
    • 2010
  • In this paper, we designed and implemented the MIMO antenna for LTE(Long Term Evolution), supposed to be a next generation communications network, DCS1800, DCS1900 and WCDMA. Using conventional monopole antenna with MD material results in good characteristics, miniaturization for LTE band and as well as broadbanding for DCS, WCDMA band. The performance of the proposed MIMO antenna shows VSWR < 2, under -10 dB of isolation and the gain is -1.66 ~ 1.33 dBi for LTE(Long Term Evolution), DCS1800, DCS1900 and WCDMA, which has omnidirectional radiation pattern.

Evolution of MIMO Technology (MIMO 기술의 진화)

  • Shim, Byonghyo;Lee, Byungju
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.38A no.8
    • /
    • pp.712-723
    • /
    • 2013
  • Recent exploration of smart-phone user is fueling the deployment of long term evolution (LTE) service that offers higher data rates service over 3G HSPA networks. In particular, Korea, mobile powerhouse, recently launched the service of LTE-Advanced (LTE-A) which is the latest release in LTE standard. Multiple-input-multiple-output (MIMO) technology is the one of key enablers for LTE and LTE-A for achieving high data rate. MIMO technology has received much attention since it is possible to achieve channel capacity in proportion to the number of antennas without increasing frequency and power. In this paper, we overview of the theoretical background of MIMO technology regarding from single-user MIMO, multiuser MIMO, and massive MIMO and design considerations to implement the communication system.