[특허]Method and system for providing a different frequency handoff in a CDMA cellular telephone system

Method and system for providing a different frequency handoff in a CDMA cellular telephone system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-007/22 H04Q-007/24
출원번호	US-0354436 (1994-12-12)
우선권정보	KR-0030100 (1994-11-16)
발명자 / 주소	Lee Dong-Wook (Daejeon KRX) Kim Myoung-Jin (Daejeon KRX) Chung Yeoung-Jee (Daejeon KRX)
출원인 / 주소	Electronics & Telecommunications Research Institute (Daejeon-shi KRX 03)
인용정보	피인용 횟수 : 97 인용 특허 : 0

초록 ▼

A cellular system transfers a call from a source base station to the target base station. A mobile unit measures the strength of pilot signals emanating from surrounding base stations. In response to the result of the measurement, a different frequency hand off operation is initiated by the mobile unit when all pilot signals are lower than a threshold or is initiated by a system controller with consideration being given to the frequency band occupation state of surrounding base stations and the strength information reported from the mobile unit. In a handoff operation, the mobile unit reduces a maximum data rate to modulate user information with a current used frequency and to modulate a different frequency preposition code with a primary frequency so that neighboring base stations may measure the intensity of the preposition code and the system controller can determine how the different frequency hand-off should be operated.

대표청구항 ▼

A CDMA cellular telephone communication system having a mobile unit communicating to a source cell-site, a system controller for directing communications between said mobile unit and said cell-site, wherein the mobile unit requires a communication transfer from the source cell-site to a target cell-site selected from a number of proximal cell-sites, said source cell-site communicating user information with said mobile unit through a predetermined frequency channel different from a primary frequency channel, said proximal cell-sites not using said predetermined frequency channel, said communication system comprising: control means, at the mobile unit, for determining if the mobile unit is to initiate a different frequency handoff based upon a comparison of intensity of pilot signals received from said source cell-site and said proximal cell-sites with a threshold value, for limiting a user data rate, and for controlling a data positioning device and a frequency synthesizer to operate in the different frequency handoff; means, at the mobile unit, for deciding a transmitting position of said user information data to be transferred to said source cell-site and a different frequency handoff preposition code under control of the control means; means, at the mobile unit, for modulating the data and said different frequency handoff preposition code with different frequencies; means, at the cell-site, for demodulating said user information data if the cell site is in a normal mode or measuring intensity of said different frequency handoff preposition code if the cell site is in the different frequency handoff mode from said mobile unit; channel control means, at the cell-site, for notifying said means for demodulating a receiving position of received data or for measuring intensity of a different frequency preposition code; means, at the system controller, for receiving the different frequency handoff request from said mobile unit, determining the different frequency handoff, controlling said source cell-site and the cell-sites in a range around said source cell-site to measure the intensity of the received different frequency handoff preposition code, selecting the target cell-site on a basis of measurements of said intensities from said cell-sites, and cutting off a call between the mobile unit and the proximal cell-sites except the target cell-site when in said handoff mode.

이 특허를 인용한 특허 (97)

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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
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연합인증

Method and system for providing a different frequency handoff in a CDMA cellular telephone system 원문보기

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연구과제 타임라인

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Method and system for providing a different frequency handoff in a CDMA cellular telephone system 원문보기

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