Feature #11: Weighted Exponential Back-off
Explore the concept of weighted exponential back-off used to control collisions in shared network channels. Understand how retransmission delays are calculated using linked lists representing random integers. Learn the step-by-step algorithm to sum these lists and evaluate the total back-off time, along with analyzing the time and space complexity of the solution.
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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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