在ns发布的版本中，不包括IEEE802.11PCF功能的实现，这个源代码填补了这个空白。-In the ns release version, does not include the realization of IEEE802.11PCF function, the source code to fill the gaps.
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new mac-802_11.c mac-802_11.h mac.h mac-timers.c mac-timers.h ll.c
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