Wi-Fi Transmission and Enhancement
, Contents
1. Overview of WiFi transmission
❑ WiFi encapsulation in OSI
❑ 802.11 frame types
❑ Management frame
❑ Control frame
❑ Data frame
❑ Medium access control
2. Case study
❑ Lab WiFi environment
❑ STA and AP retransmit so much in low RSSI condition
3. WiFi enhancement
❑ Physical layer enhancement
❑ MAC layer enhancement
, WiFi encapsulation in OSI
▪ The IEEE 802.11-2007 standard defines communication mechanisms only at the Physical layer and MAC sublayer of the Data-Link layer of
By design, the 802.11 standard does not address the upper layers of the OSI model
▪ When capturing wireless frames, if wireless encryption is implemented, all of the layer 3 through layer 7 information will be grouped and
encrypted payload
, Contents
1. Overview of WiFi transmission
❑ WiFi encapsulation in OSI
❑ 802.11 frame types
❑ Management frame
❑ Control frame
❑ Data frame
❑ Medium access control
2. Case study
❑ Lab WiFi environment
❑ STA and AP retransmit so much in low RSSI condition
3. WiFi enhancement
❑ Physical layer enhancement
❑ MAC layer enhancement
, WiFi encapsulation in OSI
▪ The IEEE 802.11-2007 standard defines communication mechanisms only at the Physical layer and MAC sublayer of the Data-Link layer of
By design, the 802.11 standard does not address the upper layers of the OSI model
▪ When capturing wireless frames, if wireless encryption is implemented, all of the layer 3 through layer 7 information will be grouped and
encrypted payload
