[특허]Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system

Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-009/02
출원번호	US-0888685 (1992-05-22)
발명자 / 주소	Malek Charles J. (Crystal Lake IL) Gravunder Greg G. (Kenosha WI)
출원인 / 주소	Motorola, Inc. (Schaumburg IL 02)
인용정보	피인용 횟수 : 35 인용 특허 : 0

초록 ▼

In a wireless communication system comprising a plurality of fixed communication units (FCUs) (102) and portable communication units (PCUs) (120), each comprising an encryption synchronization counter (ESC) (314, 414), the PCU and FCU having a digital transmission format (201), a method of maintaining encryption and decryption throughout a hand-off is shown, comprising the steps of: (a) loading (708) during a hand-off initiation a continuation value for a second FCU ESC; and (b) incrementing (709) synchronously the second FCU ESC and the PCU ESC, starting from the continuation value and beginning at the time of hand-off completion.

대표청구항 ▼

In a wireless communication system comprising a plurality of fixed communication units (FCUs), the FCU comprising an FCU encryption synchronization counter (ESC), and at least one portable communication unit (PCU), the PCU comprising a PCU ESC, the PCU and FCU for generating and receiving transmissions of information having a digital format and comprising a periodically recurring synchronization marker for synchronizing the transmissions, a method of maintaining a synchronized encryption and decryption of the information without interruption throughout a hand-off, the method comprising the steps of: loading, after establishment of a second wireless link between a PCU and a second FCU for receiving a hand-off of the PCU from a first wireless link with a first FCU to the second wireless link with the second FCU, a continuation value for the contents of a second FCU ESC in the second FCU, the continuation value comprising a value expected in the PCU ESC concurrent with hand-off completion, wherein the loading step comprises the steps of: selecting in the PCU a time of a specific future occurrence of the periodically recurring synchronization marker subsequent to the establishment of the second wireless link as the time selected for hand-off completion; calculating in the PCU the continuation value from the contents of the PCU ESC at an occurrence of the periodically recurring synchronization marker prior to the time selected for hand-off completion in response to the selecting step, the continuation value being calculated in a manner that predicts the contents of the PCU ESC at the time selected for hand-off completion; and transmitting the completion value and the time selected for hand-off completion from the PCU to the second FCU in response to the calculating step; and incrementing synchronously the second FCU ESC and the PCU ESC, starting from the continuation value loaded in the loading step and beginning at the time selected for hand-off completion.

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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
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system 원문보기

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Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system 원문보기

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이 특허를 인용한 특허 (35)

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