Figure 12.10 Behavior of three persistence methods 三种坚持型方法的行为 Sense and transmit Continuously sense Time Busy a.1-persistent Sense and transmit Sense Sense Wait Wait >Time Busy b.Nonpersistent Probability outcome does not allow transmission. Transmit Continuously sense Time slot Time slot i Time slot Time Busy C.p-persistent 12.1712.17 Figure 12.10 Behavior of three persistence methods 三种坚持型方法的行为