The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 1998
Filed:
Oct. 10, 1995
Hideo Matsuki, Kanagawa, JP;
Hitoshi Takanashi, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An SR (Selective Repeat) ARQ system with limited buffer memory is realized by modifying a part of a user data area. A transmitter side modifies a part of a user data area in a data frame so that it differs at least one bit from corresponding part of a frame with the same frame number as that of a current frame in a preceding modulo turn, and a receiver side compares said part of a user data area with corresponding part of a frame with the same frame number as that of a current frame in a preceding modulo turn. When they coincide, the receiver side disregards the received frame as it is re-transmitted frame which is already received correctly, and when they do not coincide, the receiver side takes the received frame. Preferably, said part of a user data area is the last word area in a user data area in a frame structure. When a user data has more words than capacity of a user data area in a frame structure, and when last word is completely equal to last word of a frame with the same frame number as that of a current frame in a preceding modulo turn, the last word in a user data area is transferred to a succeeding frame, and an area for that last word is filled with a data which differs at least one bit from a data in the last word in the corresponding frame having the same frame number as that of the current frame in a preceding modulo turn.