[ns] there are many different between Mac/802_11 and article of IEEE802_11

hello i study the  article "IEEE 802.11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications" and compare the frames and structure of MAC protocol with MAC/802_11 in NS2 but there are many different between article and simulated Mac protocol in NS2 can any bo

[ns] there are many different between Mac/802_11 and article of IEEE802_11

hello i study the  article "IEEE 802.11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications" and compare the frames and structure of MAC protocol with MAC/802_11 in NS2 but there are many different between article and simulated Mac protocol in NS2 can any body help