802.11协议学习

IEEE 802.11 is defined within the protocol architecture developed as an IEEE 802 standard, consisting of three layers: logical link control (LLC), media access control (MAC), and physical。
其中主要关注的是MAC和PHY层。在研究驱动的时候大多数需要明白帧的管理及交互方式。
Independent basic service sets (IBSSs) 也就是说的adhoc网络，即点对点的方式通信的网络结构。
Basic service sets (BSSs)：一个AP+多个station。
A BSS is a group of 802.11 stations communicating with one another. A BSS requires a specialized station known as an access point (AP). The AP is the central point of communications for all stations in a BSS. The client stations do not communicate directlyother client stations. Rather, they communicate with the AP,and the AP forwards the frames to the destination stations. The AP might be equipped with an uplink port that connects the BSS to a wired network (for example, an Ethernet uplink)
Extended service sets (ESSs)：由多个bss组成。AP和AP之间可以进行通信。
1：PHY层
The 802.11 2.4 GHz frequency hopping PHY(跳频)
The 802.11 2.4 GHz direct sequencing PHY(直接序列)
The 802.11b 2.4 GHz direct sequencing PHY
The 802.11a 5 GHz Orthogonal Frequency Division Multiplexing (OFDM) PHY
The 802.11g 2.4 GHz extended rate physical (ERP) laye