IEEE802.11b LAN use wireless media to transmit information. Since the wireless media is more complex than wired media, the MAC layer access controling mechanism of IEEE802.11b is more complex.

• IEEE80 2 .；11b采用无线方式传输信息；而无线方式传输与有线方式传输相比；具有较大的复杂性；所以其MAC(媒体访问控制 )机制也更加复杂。