The
IEEE 802.11
IEEE 802.11 is part of the IEEE 802 set of local area network (LAN) technical standards, and specifies the set of media access control (MAC) and physical layer (PHY) protocols for implementing wireless local area network (WLAN) computer commun ...
family of standards describe the
DCF protocol, which controls access to the physical medium. A station must sense the status of the wireless medium before transmitting. If it finds that the medium is continuously idle for DCF Interframe Space (DIFS) duration, it is then permitted to transmit a frame. If the channel is found busy during the DIFS interval, the station should defer its transmission.
DIFS duration can be calculated by the following method.
DIFS =
SIFS
Short Interframe Space (SIFS), is the amount of time in microseconds required for a wireless interface to process a received frame and to respond with a response frame. It is the difference in time between the first symbol of the response f ...
+ (2 * Slot time)
[, 2016, Equation (10-6), page 1332.]
IEEE 802.11g is backward compatible with
IEEE 802.11b
IEEE 802.11b-1999 or 802.11b is an amendment to the IEEE 802.11 wireless networking specification that extends throughput up to 11 Mbit/s using the same 2.4 GHz band. A related amendment was incorporated into the IEEE 802.11-2007 standard. ...
. When these devices are associated with same AP all the timing parameters are changed to 802.11b.
See also
*
SIFS
*
PIFS
*
AIFS
*
RIFS
*
EIFS
*
DCF
References
{{reflist
D
Media access control