Automatic Repeat-reQuest (ARQ) is an error control method for data transmission which makes use of acknowledgments and timeouts to achieve reliable data transmission. An acknowledgment is a message sent by the receiver to the transmitter to indicate that it has correctly received a data frame. In information theory and coding error control is divided in two main categories: Error Detection Redundancy allows a receiver to check whether received data has been corrupted during transmission. ... Data transmission is the conveyance of any kind of information from one space to another. ...
Usually, when the transmitter does not receive the acknowledgment before the timeout occurs (i.e. within a reasonable amount of time after sending the data frame), it retransmits the frame until it is either correctly received or the error persists beyond a predetermined number of retransmissions.
A few types of ARQ protocols are Stop-and-wait ARQ, Go-Back-N ARQ and Selective Repeat ARQ. Stop-and-wait ARQ is one kind of ARQ Protocol, in which the communication is done one frame at time. ... Go-Back-N ARQ is a specific instance of ARQ Protocol, in which the sending process continues to send a number of frames specified by a window size without receiving an ACK packet from the receiver. ... Selective Repeat ARQ is a specific instance of ARQ Protocol, in which the sending process continues to send a number of frames specified by a window size even after a frame loss. ...
Hybrid ARQ (HARQ) is a variation of the ARQ error control method, which gives better performance than ordinary ARQ, particularly over wireless channels, at the cost of increased implementation complexity. ...
References
Peterson and Davie, Computer Networks: A Systems Approach, Third Edition, 2003
ARQ can also stand for Admission Request in H.323Registration, Admission and Status (RAS) messages we studied well about arq cycle redudance check byke redendancy check pappan redundance check by pappan new delhi H.323 is an umbrella recommendation from the ITU-T, that defines the protocols to provide audio-visual communication sessions on any packet network. ... H.323 Gatekeepers communicate through the RAS channel using different types of RAS messages. ...
ARQ: For over 50 years the nuclear nations of this world were engaged in the race to produce plutonium for their nuclear weapons stockpile, which, we are told, helped maintain world peace based on the insane dogma of mutually assured destruction (MAD).
ARQ: In addition to this urgent desire to dispose of plutonium, the following concerns seem to be of paramount importance: preventing theft and proliferation of nuclear weapons, protecting the public and environment from contamination, and if economically feasible, using plutonium as a viable energy source to fuel further progress.
ARQ: Yes, we know that we live in an environment of natural radioactivity and, therefore, it is unnatural to think of a "radiation-free" environment.
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