• Title, Summary, Keyword: PCS 단말기

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분실단말기 집중관리센터 운영 현황

  • Go, Jung-Heung
    • 정보화사회
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    • pp.39-41
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    • 1999
  • '99. 4월부터 "PCS폰 주인찾아주기"운동 일원화로 한국정보통신진흥협회는 신세기통신과 PCS 3사가 참여한 가운데 분실단말기 집중관리센터를 개소, 운영해 오고 있다.

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Broadband Main and Sub Antenna Connected by the Transmission Line (전송선으로 연결된 광대역 주, 부 안테나)

  • Park, Mingil;Son, Taeho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.13 no.2
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    • pp.42-49
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    • 2014
  • A broadband antenna using a main and a sub antenna for the mobile communication terminal such as mobile phone and ITS terminal is designed. Two antennas are based on the hybrid antenna that is operating both a monopole and a IFA(Inverted F Antenna). It's applied the transmission line to connect both antennas. Sub antenna located in small space of the terminal allows space usability for the terminal design. Antenna for the hexa-frequency band of LTE700, CDMA, GSM, DCS, PCS and WCDMA is designed and implemented on the bare PC board that is same size of the mobile phone. This antenna was measured 3 : 1 VSWR over the whole design band. And average gains and efficiencies were-3.78 ~ -2.62dBi and 41.9 ~ 54.73% for LTE700/CDMA/GSM frequency band, -3.75 ~ -1.84dBi and 42.19 ~ 65.46% for DCS/PCS/WCDMA frequency band.

Design & Implementation of Receiver RF Block for PCS Mobile Station (PCS 단말기의 수신단 고주파부 설계 및 구현)

  • 안상면;양운근
    • Proceedings of the IEEK Conference
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    • pp.65-68
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    • 2000
  • In this paper, design parameters are investigated and design procedure is established for PCS mobile station, especially for receiver RF block. And simulation environment to analyze parameters of the receiver RF block to determine whether it satisfies the receiver standard, IS-98C, is calculated. Design parameters are simulated and optimized. With simulated results, PCS mobile station is implemented and tested. Measured results show good agreement with simulation Design procedure can be used to get optimum characteristics for each of receiver block. By using optimum characteristics, mobile station can be designed more efficiently.

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Location Information Reusing for Frequent Terminal Mobility in PCS (PCS에서 빈번한 단말기이동성의 위치정보 재사용)

  • 이동춘
    • The Journal of Information Technology
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    • v.3 no.2
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    • pp.115-126
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    • 2000
  • When a terminal frequently crosses a RA or a call originate in a boundry cell, HLR should be updated or queried. Frequent DB accesses and message transfers may cause the HLR bottleneck and degrade the system performance. This paper propose scheme to solve the HLR bottleneck problem and reduce to call registration cost and call tracking cost in wirless networks.

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Improvement of Radiation Performance of Mobile Phone Antenna Using PIFA on U-Shaped Ground Plane (U-형 접지면 상에 배치된 평판형 역 F 안테나 구조를 이용한 휴대폰 단말기의 무선 성능 개선)

  • Lee, Jeong-Ho;Song, Jae-Kwan;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.1
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    • pp.90-97
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    • 2010
  • In this paper, we propose antenna topology and ground plane shape to improve the performance of PIFA (Planar Inverted F Antenna) which is built-in mobile phone. First, we designed the PIFA antenna consists of multiple radiators to provide multi-current paths. Then we designed U-shaped ground plane on the PCB under the antenna. The proposed antenna structure shows TRP/TIS improvement of 2.0 dB/3.7 dB for GSM and 2.2 dB/ 2.0 dB for DCS and 0.8 dB/1.5 dB for PCS and 1.3 dB/0.7 dB for WCDMA at the free space.

The Design of a Low-Profile Loading Sleeve Monopole for PCS and IMT-2000 Frequency Bands (PCS 및 IMT-2000 대역용 소형 로딩 슬리브 모노폴 설계)

  • 최광제;이은학
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.2
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    • pp.178-182
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    • 2003
  • In this paper, we designed a loading sleeve monopole operating at PCS and IMT-2000 frequency bands using the structure of the broadband loading sleeve monopole. The length of the designed antenna is lower than that of the helical antenna coupled with a whip used in commercial PCS handsets. The length and diameter of the designed antenna are 38 mm and 8 mm, respectively. The designed loading sleeve monopole is fabricated and investigated experimently. The VSWR is less than 1.5 in the PCS and IMT-2000 frequency bands(1750 MHz~2170 MHz) and gain is 3.5 dBi.

Design and Implementation of Multiple Message Handling API for PCS Operating Systems (PCS 정보단말기용 소형 운영체제에 적합한 다중 메시지 처리 API의 설계 및 구현)

  • 김정수;염근혁
    • Proceedings of the Korean Information Science Society Conference
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    • pp.694-696
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    • 1999
  • 최근에는 Non-PC 디바이스들을 위한 Embedded OS들이 PCS, PDA, 핸드헬드(Handheld) 컴퓨터, 터미널, 산업용 제어기 및 다른 소형 컴퓨터에서부터 인터넷 TV, 디지털 셋탑 박스, 웹폰, 인터넷 디바이스, 및 Mobile Computing 분야에 이르기까지 다양한 분야에서 그 요구가 급증하고 있다. 현재 이러한 응용들은 사용자의 응답시간이 빠른 표준 API(Application Programming Interface)의 사용을 필요로 한다. Window System의 Application을 개발하기 위해서는 보통 Win32 API를 사용한다. 그런, Win32 API에서 제공하는 자료형과 관련 함수들이 크기가 크고 속도가 느려서 소형의 적은 메모리와 빠른 속도를 필요로 하는 PCS 단말기에는 적합하지가 않다. 따라서 기존의 API의 기능을 충실히 수행하면서 PCS에 최적화된 API에 대한 연구가 필요하다. 본 논문에서는 PCS 정보단말기용 소형 운영체제에 적합한 API를 GWES(Graphics, Windowing, and Events Subsystem) 모델을 기반으로 설계하였으며 사용자 응답시간 지연을 해결하기 위해서는 Event 처리를 최소화하는 다중 메시지 처리 방식을 개발하였다.

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A location tracking scheme using embedded-pager PCS terminals (Pager 내장형 PCS 단말기를 이용한 location tracking 기법)

  • 장경훈;심재정;박정식;김덕진
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.3
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    • pp.1-11
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    • 1997
  • Since the radio spectrum is limited, future wireless system will have micro cellular architecture in order to provide multimedia traffic services on personal communicatons network. The small coverage area of micro cellular systems results in frequent hadnoffs and location updates. We focuse on network load and terminal power due to frequent location updates and propose a location tracking scheme using embedded-pager PCS terminals. The proposed scheme is expected to minimize theconsumption of PCS terminal powr and improve the receiving rate of callee because of the power saving mechanism and the embedded-pager PCS terminal. This paper proposes signaling flows among the network elements for the proposed location tracking scheme. The signaling flows are accomodated to not only the existed network architectures but alsothe ATM backbone network arcitecture. To verify the signaling flows, we used petri-Net model. The resutls show that the signaling flows are suitable to our proposed location tracking scheme.

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Antenna Efficiency Variation by the Influence of Human Body (인체의 영향에 의한 안테나 효율의 변화)

  • Lee, Yong-Joo;Han, Jun-Hee;Yang, Woon-Geun
    • Journal of IKEEE
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    • v.12 no.4
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    • pp.185-195
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    • 2008
  • In this paper, PIFA(Planar Inverted F Antenna) which operates in PCS(Personal Communication System) band is designed and characteristics are investigated. Designed PIFA was installed in three types of handsets, folder, bar, slide, and the performance was evaluated. Head and hand phantom were added to make the most similar environment to real condition of mobile phone use, and influences on antenna performance were analyzed. The simulation results confirm radiation patterns are greatly changed and antenna efficiency is decreased by the effect of human body. Performance variation of the mobile handset antenna was observed as changing the angle between mobile handset and head phantom from $0^{\circ}$ to $2^{\circ},\;4^{\circ}$ to confirm the variation caused by the relative position of mobile handset and head phantom. Directivity was decreased gradually as the antenna goes away from head phantom, and showed the trend of increasing efficiency. But in the case of bar type, where the position of antenna is relatively close to head phantom, that trend didn't show. It was confirmed that the shape of handset has a great effect on the performance.

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Triple-band printed antenna based upon switching properties (전환특성을 이용한 삼중대역 인쇄형 안테나)

  • Lee, Young-Soon;Yoo, Jin-Ha
    • Journal of Advanced Navigation Technology
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    • v.15 no.2
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    • pp.197-203
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    • 2011
  • A triple-band antenna which can be used at GSM900, PCS1900 and Bluetooth(or Wi-Fi) frequency band is proposed. The proposed antenna is designed based upon switching between IFA(Inverted F Antenna) that has a resonant length of ${\lambda}/4$ and loop antenna that has a resonant length of ${\lambda}/2$. It can be applied to triple-band only by use of single printed pattern due to the switching characteristic. It is designed by use of the IFA for the application to the GSM900, while it is designed by use of the loop antenna for the application to the PCS1900 and by use of additional pattern of IFA for the application to the Bluetooth(or Wi-Fi) respectively. As a result, it has been observed that the proposed antenna satisfies the required return loss(${\leq}10dB$) and also has efficiency(${\geq}80%$) over the whole band. Moreover the proposed antenna has omni-directional radiation pattern which is suitable to apply to the mobile phone.