[특허]Spread spectrum cellular handoff apparatus and method

Spread spectrum cellular handoff apparatus and method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-027/30
출원번호	US-0727617 (1991-07-10)
발명자 / 주소	Schilling Donald L. (Sands Point NY)
출원인 / 주소	SCS Mobilecom, Inc. (Port Washington NY 02)
인용정보	피인용 횟수 : 137 인용 특허 : 0

초록 ▼

An apparatus for controlling handoff in a spread-spectrum-CDMA-communications system, of radio devices moving from a cell having a base station which transmits a first spread-spectrum-communications signal with a first generic-chip-code signal, toward a different cell having a base station for transmitting a second spread-spectrum-communications signal with a second generic-chip-code signal. A radio device includes a PCN antenna, a first matched filter having an impulse response matched to the first generic-chip-code signal and a first detector for detecting the first generic-chip-code signal embedded in the first spread-spectrum-communications signal. A second matched filter has an impulse response matched to the second generic-chip-code signal and a second detector detects the second generic-chip-code signal embedded in the second spread-spectrum-communications signal. A comparator generates a comparison signal by comparing the first detected signal with the second detected signal. A receiver-message-chip-code generator generates a replica of the message-chip-code signal and a message mixer, using a replica of the message-chip-code signal, despreads the spread-spectrum-communications signal as a modulated-data signal. A synchronization circuit, based on the comparison signal being greater than a threshold, synchronizes the receiver-message-chip-code generator to the first generic-chip-code signal for receiving the first spread-spectrum-communications signal, and in response to the comparison signal being less than the threshold, synchronizes the receiver-message-chip-code generator to the second generic-chip-code signal for receiving the second spread-spectrum-communications signal. A control unit switches transmitting the message data, spread-spectrum processed with a message-chip-code signal, embedded in the first spread-spectrum-communications signal from the first base station, to the second spread-spectrum-communications signal transmitted from the second base station.

대표청구항 ▼

An apparatus for controlling handoff of radio devices moving from one cell toward an adjacent cell of a spread-spectrum-CDMA-communications system, each adjacent cell having its own generic-chip-code signal embedded in a spread-spectrum-communications signal, comprising: a first base station for transmitting a first spread-spectrum-communications signal having a first generic-chip-code signal and message data spread-spectrum processed with a message-chip-code signal, embedded therein; a second base station for transmitting a second spread-spectrum-communications signal having a second generic-chip-code signal embedded therein; a radio device including, a personal-communications-network (PCN) antenna; a first matched filter coupled to said PCN antenna and having an impulse response matched to the first generic-chip-code signal; a first detector coupled to said first matched filter for detecting the first generic-chip-code signal embedded in the first spread-spectrum-communications signal communicated from said first base station and outputting a first detected signal; a second matched filter coupled to said PCN antenna and having an impulse response matched to the second generic-chip-code signal; a second detector coupled to said second matched filter for detecting the second generic-chip-code signal embedded in the second spread-spectrum-communications signal communicated from said second base station and outputting a second detected signal; a comparator coupled to said first detector and to said second detector for generating a comparison signal by comparing the first detected signal with the second detected signal; a receiver-message-chip-code generator for generating a replica of the message-chip-code signal; a message mixer coupled to said receiver-message-chip-code generator and said PCN antenna, responsive to the replica of the message-chip-code signal, for despreading the spread-spectrum-communications signal as a modulated-data signal; a message-bandpass filter coupled to said receiver-message-mixer device for filtering the modulated-data signal; a message detector for demodulating the modulated-data signal as received data; a synchronization circuit coupled to said comparator and responsive to the comparison signal being greater than a threshold, for synchronizing said receiver-message-chip-code generator to the first generic-chip-code signal for receiving the first spread-spectrum-communications signal from said first base station, and responsive to the comparison signal being less than the threshold for synchronizing said receiver-message-chip-code generator to the second generic-chip-code signal for receiving the second spread-spectrum-communications signal from said second base station; and a control unit coupled to said first base station and said second base station and to many other base stations for switching the message data spread-spectrum processed with a message-chip-code signal, embedded in the first spread-spectrum-communications signal transmitted from said first base station, to the second spread-spectrum-communications signal transmitted from said second base station.

이 특허를 인용한 특허 (137)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
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Spread spectrum cellular handoff apparatus and method 원문보기

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Spread spectrum cellular handoff apparatus and method 원문보기

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