图14.4CSMA/CA流程图 Start DCF使用CSMA/CA为 Set back-off 访问方式,原因是: to zero Persistence ■冲突检测 strategy ·隐藏站的问题 Wait DIFS Send RTS ·站点之间的距离的问题 Wait back-of Set a timer time NoCTS received before time-out? Yes Wait SIFS Send the frame Set a timer No Back-off Increment No ACK received limit? back-off oefore time-out Yes Yes Abort Success 14.8 14.8 图14.4 CSMA/CA流程图 DCF使用CSMA/CA为 访问方式,原因是: 冲突检测 隐藏站的问题 站点之间的距离的问题