Abstract:
본 발명은 RRH 등과 같은 기지국 장치 또는 중계기에서 이동통신 신호를 중계하는데 있어서, 주변 환경 및 신호 상태를 분석하여 송출하는 신호의 이득 및 출력을 최적화된 조건으로 설정하기 위한 이동통신 신호의 출력 제어 방법 및 장치에 관한 것으로서, 기지국으로부터 이동통신 단말로 전송되는 하향 이동통신 신호를 증폭하여 송출하는 장치로 입력된 하향 이동통신 신호를 분석하여, 구성 형태 및 레벨을 나타내는 무선 파라미터를 추출하고, 추출된 무선 파라미터를 이용하여 전송되는 하향 이동통신 신호의 데이터량을 산출하고, 산출한 데이터량에 근거하여 상기 하향 이동통신 신호의 출력 레벨을 설정하고, 조절하도록 구현된다.
Abstract:
본 발명은 전압 조절 장치에 관한 것으로, 입력 신호를 증폭하기 위한 푸시풀(push-pull) 구조의 증폭기에서 풀 다운(pull down) 부분 대신에 음극이 부하 방향을 향하도록 배치한 방향성 다이오드인 제1 다이오드(diode)를 포함시키고 풀 업(pull up) 경로만을 사용하는 선형 증폭 모듈, 상기 선형 증폭 모듈에서 공급하는 전압과 부하에 걸리는 전압 간의 차이를 감지하여 제어 신호를 전달하는 신호 감지 모듈, 및 상기 신호 감지 모듈의 제어 신호에 따라 부하로 전력을 전달하는 하나 이상의 전압 가변 모듈을 포함하며, 이로 인해 부하로 전달하는 전력의 효율을 높일 수 있다.
Abstract:
PURPOSE: An optical repeater having a transmission diversity function is provided to divide a transmitting signal transmitted from a base station to a mobile station into the first and second signals, adjust the second signal so that the second signal has the time difference over one chip as to the first signal, and transmit the first and second signals to the mobile station. CONSTITUTION: A master unit(240) transmits a transmitting signal from a base station(200) through an optical cable. A slave unit(250) has a forward signal processing unit for dividing the transmitting signal received from the master unit(240) through the optical cable into the first signal and the second signal, and a transmission diversity unit for adjusting the second signal so that the second signal has a uniform time difference as to the first signal. The slave unit(250) includes the first transmitting and receiving antenna(252) for transmitting the first signal to a mobile station(210), and the second transmitting and receiving antenna(254) for transmitting the adjusted second signal to the mobile station(210).
Abstract:
본 발명은 GPS(Global Positioning System)기능과 Navigation 기능이 장착된 휴대인터넷 단말장치를 이용하여 이용자가 차량 운행시 자신의 운행 도로 및 운행속도 등의 상태 정보를 휴대인터넷 단말장치를 이용하여 실시간으로 무선 휴대인터넷 기지국에 송신하고 서버에 전송하게 된다. 서버는 각각의 이용자의 휴대인터넷 단말장치를 통하여 데이터베이스를 제공받게 되고 각각을 종합하여 저장하고 저장되는 데이터베이스는 사용자에게 실시간으로 제공하여 가장 효율적인 정보를 전송 받게 됨으로써 현재의 도로상태를 정확하게 파악하고 신속하게 대처하면서 운행할 수 있도록 하는 도로상황 정보 전송 시스템이다. 도로상황 정보, GPS, 휴대인터넷 단말장치
Abstract:
PURPOSE: An optical repeater in a mobile communication network is provided to control many signals having multi paths to have at least one-chip time difference, to perform a time diversity function, so as to improve a service quality of the mobile communication network. CONSTITUTION: A mobile station-facing antenna(342) receives the first signal from a mobile station(310). The first diversity antenna(346) receives the second signal having a different transmission path from the first signal. A receiving only antenna(344) receives the third signal from the mobile station(310). The second diversity antenna(348) receives the fourth signal having a different transmission path from the third signal. The first time diversity unit controls the second signal to have a regular time different for the first signal. The second time diversity unit controls the fourth signal to have a regular time difference for the third signal. A slave unit(340) synthesizes the first synthetic signal and the second synthetic signal to generate the third synthetic signal. The first synthetic signal is made by synthesizing the first signal with the controlled second signal. The second synthetic signal is made by synthesizing the third signal with the controlled fourth signal. The slave unit(340) has reverse signal processors for converting the third synthetic signal into an optical signal to output the optical signal through an optical cable. A master unit(330) converts the third synthetic signal into an electrical signal, and separates the converted third synthetic signal into the first and the second synthetic signals, to transmit the first synthetic signal to a base station(300), then converts a frequency of the second synthetic signal to transmit the frequency-converted second synthetic signal to the base station(300).
Abstract:
PURPOSE: A band conversion repeater in a mobile communication network is provided to use a half of an assigned service band as a service channel band, and to use the rest half as a link channel band, to convert a frequency signal of a service signal into a frequency signal of the link channel band, so as to maintain a wider coverage in every area without increasing base stations. CONSTITUTION: A donor device(330) converts the first signal received from a base station(300) to make the first signal have a link frequency within a link channel band, which occupies a half of an assigned frequency band. The donor device(330) converts the received second signal, which is converted into a link frequency signal after being transmitted from a mobile station(310), to make the second signal have a service frequency within a service channel band except the link channel band, and transmits the second signal to the base station(300). A remote device(340) converts the converted first signal into a service frequency corresponding to a link frequency, and transmits the service frequency to the mobile station(310). The remote device(340) converts the second signal into the link frequency within the link channel band, and transmits the link frequency to the donor device(330).
Abstract:
The present invention relates to a relay system for a mobile communications service based on time division duplex, capable of precisely synchronizing a switching timing of a downlink with a switching timing of an uplink and being actively adaptive even when the switching timing is changed. In the relay system, a synchronization module analyzes a signal frame received from a base station and extracts a synchronization signal for switching between downlink and uplink intervals which are divided according to a time division scheme. A relay module performs switching between the downlink and uplink intervals based on the synchronization signal extracted by the synchronization module. Therefore, the relay system receives the signal frame from the base station and transmits the signal frame to a user device during the downlink interval, and transmits the signal received from the user device to the base station during the uplink interval.
Abstract:
본 발명은 주파수 변환 중계 방법 및 장치가 개시된다. 본 발명에 의한 주파수 변환 중계 방법에 의하면,기지국으로부터 신호를 수신하고, 기지국에 할당된 주파수 대역 중 현재 사용하고 있지 않은 주파수 대역을 감지하여, 감지된 주파수 대역으로 신호의 주파수를 변환하여, 변환된 주파수로 신호를 이동국으로 전송한다. 본 발명에 따르면, 이동 통신 및 와이브로와 같은 무선 통신 서비스에서 무선 통신 서비스의 커버리지를 확대하면서도 무선 통신 서비스의 운용 및 설치 비용을 줄일 수 있고, 유휴 주파수 신호와 서비스 채널 대역 신호로 변환하는 과정을 반복적으로 수행하여야 하지 않고도 무선 통신 서비스의 주파수 변환 중계가 가능한 장점이 있다. 무선통신, 이동통신, WCDMA, 와이브로, wibro, 기지국, 광중계기, FAC
Abstract:
A method for operating a T-DMB(Terrestrial-Digital Multimedia Broadcasting) service using facilities of a mobile communication repeater system and TV common antenna facilities is provided to easily obtain a coverage with respect to a shadow area additionally generated after a T-DMB repeater is installed in a building. A T-DMB signal radiated from a T-DMB base station is inputted to a DMB receive antenna. The signal inputted to the DMB antenna is combined with a mobile communication signal by using a coupler and a diplexer and then transmitted to a feeder. After passing through the feeder, the signal is divided by the coupler and the diplexer into a DMB signal and a mobile communication signal. The DMB signal is amplified by a T-DMB repeater or a booster, combined by the coupler and the diplexer, and then transmitted to the feeder. The signal which has been transmitted to the feeder is divided again by the coupler and the diplexer so as to be transmitted to a T-DMB service antenna and a mobile communication service antenna, and the service antenna radiates the signal to a propagation shadow area to resolve a propagation shadow.