Feature #11: Weighted Exponential Back-off
Explore the concept of weighted exponential back-off in network protocols to manage data collisions. Understand how devices use random back-off times represented by linked lists and practice adding these numbers digit-by-digit to find total wait times. This lesson guides you through the algorithm, its implementation, and time and space complexities.
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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 time slots, where r is a random integer between 1 and 9.
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