- The cause of
poor performance in
the Stop-and-Wait protocol:
- The sender must wait for an ACK frame before the sender can transmit the next frame
- Reason
why a
sender must
wait:
- The Stop-and-Wait protocol will
only need to
deal with
- One lost data frame or ACK frame at any moment in time.
- This simplifies the analysis of its correctness greatly
- The Stop-and-Wait protocol will
only need to
deal with
- The channel utilization can
be increased by
- allowing the
sender to transmit a
multiply
of frames
without having to
wait
for an ACK frame:
- allowing the
sender to transmit a
multiply
of frames
without having to
wait
for an ACK frame:
- However:
- This complicates
the task of
- reliable data communication
greatly !!!
- This complicates
the task of
- Sliding Window:
- Sliding Window =
an
automatic repeat request (ARQ) protocol,
in which:
- the sending process continues to send a number of frames specified by a (send) window size even without receiving an acknowledgement (ACK) frame from the receiver.
Wikipedia page: click here
- Sliding Window =
an
automatic repeat request (ARQ) protocol,
in which:
- Go-back-N:
- Go-Back-N ARQ =
a specific instance of the
Sliding Window protocol,
in which:
- The receive window size = 1
Wikipedia page: click here
- Go-Back-N ARQ =
a specific instance of the
Sliding Window protocol,
in which: