Figure 12.11 Flow diagram for three persistence methods 三种坚持型方法的流程框图 Channel? Channel? Wait Busy Busy randomly Idle ldle Station can transmit. Station can transmit. a.1-persistent b.Nonpersistent Channel? Busy ldle Wait a >p Channel? Probability slot outcome? Busy Use back-off process Station can transmit. as though collision occurred. c.p-persistent 12.18 12.18 Figure 12.11 Flow diagram for three persistence methods 三种坚持型方法的流程框图