KR100598662B1 - 패킷 전송 프로토콜용의 손상된 패킷을 복구하는 방법 - Google Patents
패킷 전송 프로토콜용의 손상된 패킷을 복구하는 방법 Download PDFInfo
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Abstract
Description
Claims (26)
- 입력 알파벳으로부터 선택되는 정렬된 복수 개의 입력 기호를 구비한 입력 파일을 출력 기호의 세트로부터 원상태로 복구 가능하도록 출력 알파벳 및 출력 기호로부터 선택되는 출력 기호를 발생하는 방법에 있어서,키 알파벳으로부터 키를 선택하고, 상기 키 알파벳 내의 가능한 키의 수가 입력 파일 내의 입력 기호의 수보다 더 큰 출력 기호용 키 I를 구하는 단계와;키 I의 소정의 함수에 따라 상기 출력 기호용 목록 AL(I)를 계산하는 단계를 포함하는데, 상기 AL(I)는 상기 출력 기호와 결합된 W(I) 결합 입력 기호의 표시이고, 중량 W는 적어도 2 개의 값들 사이에서 변화하며 적어도 하나의 I의 값에 대해 1보다 큰 양의 정수이며;출력 기호의 값 B(I)를 AL(I)로 표시된 상기 결합된 입력 기호의 소정의 함수로부터 발생시키는 단계를 포함하는 것을 특징으로 하는 출력 기호의 발생 방법.
- 제1항에 있어서, 상기 출력 기호용 키 I를 구하는 단계는 랜덤 함수 또는 의사 랜덤 함수에 따라 키 I를 계산하는 단계를 포함하는 것인 출력 기호의 발생 방법.
- 제1항에 있어서, 상기 출력 기호용 목록 AL(I)를 계산하는 단계는 키 I의 랜덤 함수 또는 의사 랜덤 함수에 따라 W(I)를 계산하는 단계를 포함하는 것인 출력 기호의 발생 방법.
- 제1항에 있어서, 상기 출력 기호용 목록 AL(I)를 계산하는 단계는 키 I의 랜덤 함수 또는 의사 랜덤 함수에 따라 AL(I)를 계산하는 단계를 포함하는 것인 출력 기호의 발생 방법.
- 제1항에 있어서, 상기 출력 기호용 목록 AL(I)를 계산하는 단계는,키 I의 소정의 함수 및 적어도 2 개의 양의 정수(적어도 하나는 1보다 큰 정수임) 이상인 확률 분포에 따라 중량 W(I)를 계산하는 단계와;목록 AL(I)용의 목록 엔트리를 계산하는 단계와;W(I) 목록 엔트리가 계산될 때까지 목록 AL(I)용의 목록 엔트리를 계산하는 단계를 반복하는 단계를 포함하는 것인 출력 기호의 발생 방법.
- 제5항에 있어서, 상기 중량 W(I)를 계산하는 단계는 W가 키 알파벳을 통해 소정의 분포에 근접하도록 W(I)를 결정하는 단계를 포함하는 것인 출력 기호의 발생 방법.
- 제6항에 있어서, 상기 소정의 분포는 균일한 분포인 것인 출력 기호의 발생 방법.
- 제6항에 있어서, 상기 소정의 분포는 벨 곡선(bell curve) 분포인 것인 출력 기호의 발생 방법.
- 제6항에 있어서, 상기 소정의 분포는, W=1일 때 1/K(여기서, K는 입력 파일 내의 입력 기호의 수임)의 확률을 가지며, W=i일 때 1/i(i-1)(여기서, i = 2,‥‥, K 임)의 확률을 갖는 것인 출력 기호의 발생 방법.
- 제6항에 있어서, 상기 소정의 분포는,소정의 조정 가능한 매개 변수 R1, R2 및 K는 입력 파일 내의 입력 기호의 수이고, 중량 W=1일 때 R1/K에 비례하는 확률을 가지며, 중량 W=2 에서 중량 W=K/R2-1 까지의 범위의 낮은 중량 급의 중량일 때 1/(W(W-1)(1-W·R2/K))에 비례하는 확률을 가지며, 중량 W=K/R2 에서 중량 W=K 까지의 범위의 높은 중량 급의 중량일 때 선택된 확률 분포를 갖는 것인 출력 기호의 발생 방법.
- 제1항에 있어서, AL(I)로 표시된 상기 결합된 입력 기호의 소정의 함수는 상기 AL(I)로 표시된 입력 기호의 배타적 논리합(XOR)인 것인 출력 기호의 발생 방법.
- 제1항에 있어서, 상기 입력 알파벳 및 출력 알파벳은 동일한 알파벳인 것인 출력 기호의 발생 방법.
- 제1항에 있어서, 상기 입력 알파벳은 2Mi 기호를 포함하고, 각 입력 기호는 Mi 비트를 부호화하며, 상기 출력 알파벳은 2Mo 기호를 포함하고, 각 출력 기호는 Mo 비트를 부호화하는 것인 출력 기호의 발생 방법.
- 제1항에 있어서, 각각의 연속 키 I는 이전의 키보다 큰 것인 출력 기호의 발생 방법.
- 제1항에 기재된 출력 기호의 발생 방법에 따라서 복수 개의 출력 기호를 각각 부호화하는 방법에 있어서,발생될 각각의 출력 기호용 키 I를 발생하는 단계와;데이터 소거 채널을 통해 전송될 출력 시퀀스로서 상기 발생된 각각의 출력 기호를 출력하는 단계를 포함하는 것을 특징으로 하는 출력 기호의 부호화 방법.
- 제15항에 있어서, 각각의 키 I는 선택된 다른 키와 독립적으로 선택되는 것인 출력 기호의 부호화 방법.
- 제1항에 있어서, 상기 출력 기호용 목록 AL(I)를 계산하는 단계는,입력 파일 내의 입력 기호의 번호 K 및 중량 W(I)를 적어도 근접하게 식별하는 단계와;K보다 크거나 같은 가장 작은 프라임 번호 P를 결정하는 단계와;P가 K보다 크면, 상기 입력 파일을 P-K 패딩 입력 기호로 적어도 논리적으로 패딩하는 단계와;1 ≤X < P 인 제1 정수 X 및 0 ≤Y < P 인 제2 정수 Y를 발생하는 단계와;1 에서 W(I) 까지의 각각의 J에 대해서 AL(I) 내의 J번째 엔트리를 ((Y+(J-1)·X) mod P)로 설정하는 단계를 포함하는 것인 출력 기호의 발생 방법.
- 제17항에 있어서, 각각의 J에 대해서 AL(I) 내의 J번째 엔트리를 설정하는 단계는,어레이 V 내의 제1 엔트리 V[J=0]를 Y로 설정하는 단계와;1 에서 W(I)-1 까지의 각각의 J에 대해서 어레이 V 내의 J 번째 엔트리 V[J]를 (V(J-1)+X) mod P)로 설정하는 단계와;목록 AL(I)로서 상기 어레이 V를 사용하는 단계를 포함하는 것인 출력 기호의 발생 방법.
- 패킷 통신 채널을 통해 소스로부터 목적지로 데이터를 전송하는 방법에 있어서,a) 입력 알파벳으로부터 선택되고 데이터 내의 위치를 각각 갖는 입력 기호의 정렬된 세트로서 전송될 데이터를 배열하는 단계와;b) 출력 알파벳으로부터 각각 선택되는 복수 개의 출력 기호를 발생하는 단계를 포함하는데,상기 복수 개의 출력 기호의 각 출력 기호는, 1) 키 알파벳으로부터 출력 기호가 발생되는 키 I를 선택하는 단계와, 2) 키 I의 함수로서 중량 W(I)를 결정[여기서, 중량 W는 적어도 2 개의 값들 사이 및 상기 키 알파벳 상에서 변화하며 상기 키 알파벳 내의 적어도 일부의 키 I의 값에 대해 1보다 큰 양의 정수임]하는 단계와, 3) 키 I의 함수에 따라 상기 입력 기호의 W(I)를 선택함으로써 상기 출력 기호와 결합된 W(I) 입력 기호의 목록 AL(I)를 형성하는 단계, 및 4) 상기 결합된 W(I) 입력 기호의 소정의 함수 값으로부터 출력 기호의 값 B(I)를 계산하는 단계에 의해 발생되며;c) 상기 복수 개의 출력 기호 중 적어도 하나를 복수 개의 패킷의 각각으로 패킷화하는 단계와;d) 상기 패킷 통신 채널을 통해서 복수 개의 패킷을 전송하는 단계와;e) 목적지에서 상기 복수 개의 패킷 중의 적어도 일부를 수신하는 단계와;f) 상기 수신된 복수 개의 패킷으로부터 데이터를 복호화하는 단계를 포함하는 것을 특징으로 하는 데이터 전송 방법.
- 제19항에 있어서, 상기 데이터를 복호화하는 단계는,1) a) 상기 출력 기호에 대한 키 I를 결정하는 단계, b) 상기 출력 기호에 대한 중량 W(I)를 결정하는 단계, 및 c) 상기 출력 기호에 대해 W(I) 결합된 입력 기호를 결정하는 단계에 의해 각각의 수신된 출력 기호를 처리하는 단계와;2) 임의의 입력 기호를 복호하기 위해 충분한 정보가 수신되었는지의 여부를 결정하는 단계와;3) 상기 수신된 정보로부터 복호될 수 있는 입력 기호를 복호화하는 단계를 포함하는 것인 데이터 전송 방법.
- 제20항에 있어서, 상기 키 I를 결정하는 단계는 패킷 통신 채널을 통해서 수신된 패킷 내에 공급되는 데이터로부터 키 I를 적어도 부분적으로 결정하는 단계를 포함하는 것인 데이터 전송 방법.
- 제20항에 있어서, 상기 복호화하는 단계는,수신된 출력 기호를 중량에 따라 선별하는 단계와;높은 중량 기호 보다 이전에 처리되는 낮은 중량 기호에 의해 출력 기호를 중량에 따라 처리하는 단계를 포함하는 것인 데이터 전송 방법.
- 제19항에 있어서, 상기 데이터를 복호화하는 단계는,1) a) 상기 출력 기호에 대한 중량 W(I)를 결정하는 단계, b) 상기 출력 기호에 대해 W(I) 결합된 입력 기호를 결정하는 단계, 및 c) 상기 W(I)에 따른 출력 기호 테이블 내의 출력 기호의 값 B(I)와 상기 출력 기호에 대한 W(I) 결합의 위치를 저장하는 단계에 의해 각각의 수신된 출력 기호를 처리하는 단계와;2) 추가의 출력 기호를 수신하여, 전술한 1)의 단계(수신된 출력 기호를 처리하는 단계) 및 후속 단계에 따라 처리하는 단계와;3) 중량 1을 가지며 출력 기호가 다 사용하지 않은 것으로 표시되지 않은 각각의 출력 기호 OS1에 대해서, a) OS1에 대응하는 입력 기호 위치에 대한 입력 기호를 계산하는 단계, b) 상기 출력 기호 테이블에 결합된 출력 기호를 식별[상기 결합된 출력 기호는 전술한 a)의 단계에서 처리된 입력 기호의 함수인 출력 기호임]하는 단계, c) 전술한 a)의 단계에서 처리된 입력 기호와 독립적으로 결합된 출력 기호를 재계산하는 단계, d) 전술한 c)의 단계에서 재계산된 상기 출력 기호의 중량을 1씩 감소시키는 단계, 및 e) 출력 기호가 다 사용된 것으로서 OS1을 표시하는 단계를 실행하는 단계와;4) 상기 입력 기호의 정렬된 세트가 목적지에서 복구될 때까지 전술한 1) 내지 3)의 단계를 반복 처리하는 단계를 포함하는 것인 데이터 전송 방법.
- 제23항에 있어서, 상기 OS1을 표시하는 단계는 출력 기호를 다 사용하기 위해 중량을 0으로 설정하는 단계를 포함하는 것인 데이터 전송 방법.
- 제23항에 있어서, 상기 OS1을 표시하는 단계는 상기 출력 기호 테이블로부터 출력 기호를 다 사용하는 것을 제거하는 단계를 포함하는 것인 데이터 전송 방법.
- 제19항에 있어서, 상기 패킷화하는 단계는 복수 개의 출력 기호를 각각의 패킷으로 패킷화하는 단계이고,상기 데이터 전송 방법은 상기 출력 기호에 대한 키의 일 부분으로서 패킷 내의 출력 기호의 위치를 사용하는 단계를 더 포함하는 것인 데이터 전송 방법.
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