System for re-transmission in data communication

Details System for re-transmission in data communication System for re-transmission in data communication

1995-10-10

1998-02-03

Baker, Stephen M.

Excavating

H04L 108

Patent

active

057152578

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.

REFERENCES:
patent: 5163054 (1992-11-01), Nagy
"An Improved Selective-Repeat ARQ Strategy", Weldon, Jr., IEEE Transactions on Communications, vol. COM-30, No. 3, Mar. 1982, pp. 480-486.
"Improving Automatic Repeat-Request (ARQ) Performance on Satellite Channels Under High Error Rate Conditions", SASTRY, IEEE Transactions on Communications, vol. COM-23, No. 4, Apr. 1975, pp. 436-439.

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