关于802.11b nav设置的疑惑

AIIC

以下摘自802.11mac 协议标准 9.2.5.4
A STA that used information from an RTS frame as the most recent basis to update its NAV setting is
permitted to reset its NAV if no PHY-RXSTART.indication is detected from the PHY during a period with a
duration of (2 × aSIFSTime) + (CTS_Time) + aPHY-RX-START-Delay + (2 × aSlotTime) starting at the
PHY-RXEND.indication corresponding to the detection of the RTS frame. The “CTS_Time” shall be
calculated using the length of the CTS frame and the data rate at which the RTS frame used for the most recent
NAV update was received.
按照协议规定，一个节点在收到一个不发给自己的rts后应该设置nav，时间为2 × aSIFSTime) + (CTS_Time) + aPHY-RX-START-Delay + (2 × aSlotTime)，
但是很多书上说nav该设置到ack，
请问一个节点在收到一个不发给自己的rts后  到底该如何设置nav？

望达人不吝赐教！！

谢谢

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aaron_520520

要研究！

lisheng509

学习一下