Figure 8
From: An Energy and Application Scenario Aware Active RFID Protocol
Types of back-off algorithms: constant, linear, linear modulus, exponential, and exponential modulus. The arrow ending at time 
(randomly chosen by each tag in the range of the ICW) is the initial back-off, then increasing B-numbers show successive back-offs. Shadowed parts show randomness in the back-off time which is added to each 
.