• Title, Summary, Keyword: WCDMA

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Exploratory Research on Relationship between the satisfaction of WCDMA and the Intention to use: Focused on the role of the customer's attitude of technology adoption (기술수용태도에 따른 WCDMA 서비스의 기능별 만족도가 서비스 이용의향에 미치는 영향에 대한 탐색적 연구)

  • Kim, Myoung-Soo;Kim, Young-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.9
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    • pp.2306-2312
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    • 2009
  • Todays, telecommunications companies tried to transform CDMA users into 3G service, WCDMA users. However, the WCDMA market growth is postponed by the lack of difference between CDMA and WCDMA service, customer's switching barriers such as loyalty program and handset, etc. Therefore, in this study, we tried to identify the relationship between the customer's satisfaction to the WCDMA services and the intention to uses using the WCDMA users' data. Additionally, we set the customer's attitude of technology adoption as a moderating variable between the customer's satisfaction to the WCDMA services and the intention to use. We expect that our results will be useful in planning the strategies of WCDMA service.

Performance Analysis of WCDMA System with the Rake Receiver over Wireless Mobile Environment (무선 모바일 환경에서 레이크 수신기를 채용한 WCDMA 시스템의 성능 분석)

  • Kang, Heau-Jo
    • Journal of Advanced Navigation Technology
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    • v.11 no.3
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    • pp.266-273
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    • 2007
  • In this paper presents the WCDMA(Wideband Code Division Multiple Access) system using the rake receiver over multipath fading and wireless mobile communication environments. The interference between the propagation paths in a multipath fading causes a serious degradation in the wireless mobile communication environments. In order to derive the path interference and reduce the fading effect the rake receiver is used. As a result, the WCDMA system using the rake receiver gives a better performance than the convention WCDMA system over a multipath fading and wireless mobile communication environments.

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Interference Investigation between WCDMA TDD System and cdma2000 System by Link-level Simulation and System-level Simulation (링크 레벨 시뮬레이션과 시스템 레벨 시뮬레이션에 의한 WCDMA TDD시스템과 cdma2000시스템 간의 상호간섭분석)

  • 차인석;장경희;김성진;최용석
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.7
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    • pp.21-30
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    • 2004
  • The capacity of WCDMA TDD system is limited mainly by the interference. So, to achieve the expected performance of WCDMA TDD system and to minimize the interference to cdma2000 system interferences, such as interference within WCDMA TDD system inter-cell interference, and interferences between cdma2000 systems, should be considered carefully. In this paper, by using System-level Simulation, we analyzed the interferences between WCDMA TDD system and cdma2000 system in practical situation based on the exact parameters of 3GPP TR 25.942 and by using System-level Simulation considering Link-level we analyze the interferences between WCDMA TDD system and cdam2000 system. From Simulation Results, we propose the condition for optimizing system capacity considering the interferences between WCDMA TDD system & cdam2000 system

Effects of Radio Frequency Electromagnetic Fields Emitted by WCDMA Mobile Phones on Pacemakers and ICDs (WCDMA 휴대전화 전자파가 인공심장 박동기 및 이식형 제세동기에 미치는 영향)

  • Chung, Jai Won;Choi, Soo Beom;Park, Jee Soo;Kim, Deok Won
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.1
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    • pp.148-154
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    • 2015
  • Reports show that global system for mobile communication (GSM) mobile phones, or two-generation (2G) mobile phones, could affect functions of pacemakers and implantable cardioverter defibrillators (ICDs). In this study, we evaluated the effects of radio frequency electromagnetic fields (RF-EMFs) emitted by wideband code division multiple access (WCDMA) mobile phones, which were third-generation (3G) mobile phones, on pacemakers and ICDs. Five pacemakers and three ICDs were subjected to in-vitro test using a ECG simulator. We used a WCDMA module (average power : 0.25 W, frequency band : 1950 MHz) instead of a real WCDMA mobile phone. To assess the effects of the WCDMA module on pacemakers and ICDs, each implantable device was placed in close proximity (within 3 mm) to the WCDMA module for 5 min. As a result, no effects were observed on the five pacemakers and three ICDs for the RF-EMFs emitted by the WCDMA module. Because WCDMA mobile phones have the higher frequency band (1800-2200 MHz) and lower power output (0.01-0.25 W) than GSM moboile phone, the RF-EMFs emitted by WCDMA mobile phones do not affect patients with pacemaker or ICD.

Factors Influencing the Market Diffusion and Marketing Strategy of WCDMA Service (국내 WCDMA 서비스의 시장확산과 마케팅전략 영향요인)

  • Kim Moon-Koo;Park Jong-Hyun;Nam Changi
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.8B
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    • pp.569-580
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    • 2005
  • In case of one of the next generation mobile telecommunication; WCDMA service, the relevant market growth is delayed by market uncertainty, lack of effective demands, rapid evolution of technology, non-existence of business strategy, lack of distinction with competitive services and killer applications. In this study we intended to analyze the influence factors of market diffusion and marketing strategy of WCDMA. For doing so, we obtained both promotion and hindrance factors for diffusing the market of WCDMA through expert survey. Also we acquired such categories as factor for adoption, willingness to pay, killer application, preferred terminal and pronising customer, which becomes the reason ifluencing on the decision of WCDMA service marketing strategy. On the basis of such results, this paper suggests the direction of deployment for marketing focusing on the strategies as customer, price, sewice, terminal provision, and positioning of WCDMA.

Performance Analysis of PCM Cell Search Algorithm for Fast Cell Search in WCDMA Systems (WCDMA. 시스템에서 빠른 셀 탐색을 위한 극성 변조 셀 탐색 알고리즘의 성능 분석)

  • 배성오;임재성
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.8A
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    • pp.598-606
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    • 2003
  • In this paper, we analyze the performance of the PCM cell search algorithm proposed for fast cell search of WCDMA systems. In order to improve both performance and complexity of the cell search algorithm standardized for WCDMA systems the PCM scheme uses a group of the polarization codes produced by a Gold code generator. The PCM scheme only uses one synchronization channel since the polarization codes modulated on P-SCH can replace the RS codes of S-SCH. Thus, the PCM reduces the BS's transmission power since only one synchronization channel can be used, and it can also reduce the complexity of receiver as compared with the conventional one. In this paper, by defining a numerical model, we analyze the performance of the PCM cell search algorithm in terms of detection probability and mean acquisition time. Consequently, we could demonstrate that the PCM cell search algorithm is superior to the standard WCDMA cell search algorithm.

Analysis and Design of WCDMA RF Repeater Uplink Capacity (WCDMA RF중계기 역방향 용량분석 및 설계)

  • Kim Jae-Woo;Jin Beom-Sik;Kwon Woo-Sung;Park Jin-Yong;Byun Jae-Wan
    • 한국정보통신설비학회:학술대회논문집
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    • pp.137-140
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    • 2003
  • 1996. 1월 CDMA방식을 이용한 이동전화서비스가 국내에 소개된 이후 커버리지를 지상에서 지하나 건물 내로 확장하기 위해 RF중계기가 보편적으로 사용되고 있다. RF중계기는 지하 등 전파가 도달하지 않는 곳에 기지국으로부터 RF로 신호를 받아 증폭시켜서 커버리지를 만들어 주는 장치로 가격과 품질 측면에서 유용한 방법이다. WCDMA는 무선구간의 기술방식이 CDMA와 유사하기 때문에 향후 CDMA와 같은 개념의 WCDMA RF중계기가 보편적으로 사용될 것으로 예상된다. 본 논문에서는 WCDMA 전파특성과 향후 제공될 서비스를 바탕으로 WCDMA RF중계기의 용량에 영향을 주는 요인들을 분석하고 새로운 용량 설계 개념을을 정의한다. 본 논문의 결과는 그 WCDMA RF중계기를 설계, 설치하는 분야, WCDMA RF중계기 기능 및 성능분석, 개발, 최적화 분야 등에 활용될 수 있다.

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A Study on Forecasting the Demand of WCDMA Mobile Phones (WCDMA 이동통신 단말기 수요예측에 관한 연구)

  • Lee, Sang-Hoon;Lee, Byoung-Chul;Kim, Yun-Bae;Kim, Jae-Bum
    • Journal of the Korea Society for Simulation
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    • v.15 no.4
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    • pp.153-160
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    • 2006
  • The demand of domestic mobile service has been explosively increasing. The forthcoming WCDMA, which open in 2006, is also a key technology in the mobile service market. The WCDMA service needs HSPDA phones which will be evolved to HSDPA. In the aspect of drawing up management strategy, practical researches about forecasting the demands of new mobile phones are necessary. In this paper, we provide the modified the Lotka-volterra model as a forecasting model, which is concerned with effects of phone prices and performance.

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Optimization Model for Location Management in WCDMA Networks (WCDMA 네트워크에서의 일치관리 최적화 모형)

  • Chung, Yong-Joo
    • Korean Management Science Review
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    • v.26 no.3
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    • pp.23-35
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    • 2009
  • This study deals with the location management in WCDMA (Wideband Code Division Multiple Access) networks. The new location management method is the one of the many techniques used to provide the packet switched (PS) services effectively in WCDMA networks. WCDMA introduces RA (routing area) for the PS services in addition to LA (location area) for the circuit switched (CS) services. WCDMA system also adopts the cooperative paging and the combined area update which are to decrease signaling traffic using the PS network resources for the CS services. Considering the characteristics of the WCDMA networks, this study formulate into the mathematical programming problem for the location management. Rather than the existing researches which consider the single MSC/SGSN networks, we deal with the multi MSC/SGSN networks, where both MSC area and SGSN area should be determined as well. Fairness between traffic loads of MSC/SGSN and the system cost incurred to MSC/SGSN are also incorporated into our model, which make the model more realistic. We propose greedy algorithms for the problems, which consists of the merger of two neighboring areas and the movement of an area. Extensive experiment has been done based on the realistic problem examples. Followed by the analysis of parameter effect on the final solutions and the quality of final solutions obtained by our greedy algorithms. Our proposed model and analysis result can be used to determine WCDMA system areas and to predict the system performance measures by the determination.

Design of WCDMA Indoor Repeater Antenna for High Isolation using the Absorber based on Metamaterial Structure (메타구조 기반의 흡수체를 이용한 높은 격리도 특성의 WCDMA 댁내형 중계기 안테나 설계)

  • Kim, Hyoung-Jun;Yoon, Na-Nae;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.49 no.6
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    • pp.57-62
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    • 2012
  • In this paper, WCDMA indoor repeater antenna using an absorber based on metamaterial structure for high isolation is proposed. The proposed antenna consist of the main patch with the absorber based on metamaterial structure and parasitic patch. The WCDMA bandwidth is obtained by utilizing the coupling between the main and parasitic patches. The size of the absorber based on metamaterial structure is $13mm{\times}13mm$, the absorption is about 94 % at 2.18 GHz. The isolation characteristic of proposed WCDMA indoor repeater antenna between the service and donor antennas is improved by using a absorber based on metamaterial. The proposed WCDMA indoor repeater antenna has a gain higher than 6 dBi with a VSWR less than 2, and an isolation between the service and donor antennas greater than 85 dB over the WCDMA band from 1.92 GHz to 2.17 GHz. And size of the proposed antenna is $75mm{\times}75mm$.