Feature #11: Weighted Exponential Back-off
Explore the concept of weighted exponential back-off used in network communication to handle data transmission collisions. Understand how two linked lists represent retransmission delays and learn to sum them digit-by-digit to find the total back-off time. This lesson helps you simulate collision avoidance using linked list algorithms and manage carry-over values for accurate results.
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Description
In our network topology, we have a shared communication channel. On this channel, all the connected devices can simultaneously transmit data, resulting in a collision. The transmission is time-slotted. After a collision, the transmitting devices back off, that is, they refrain from retransmitting for a random number of time slots.
To this end, the device draws a random integer, r, between 1 and 9 and waits for as many time slots. In case of another collision on the first retry, the device draws a random integer again, r, between 1 and 9, and waits for time slots. In case of successive retransmission failures, the device backs off for ...