Arbitration inter-frame spacing (AIFS), in
wireless LAN
A wireless LAN (WLAN) is a wireless computer network
A wireless network is a computer network that uses wireless data connections between network nodes.
Wireless networking is a method by which homes, telecommunications networks and bus ...
communications, is a method of prioritizing one Access Category (AC) over the other, such as giving voice or video priority over email. AIFS functions by shortening or expanding the period a wireless node has to wait before it is allowed to transmit its next frame. A shorter AIFS period means a message has a higher probability of being transmitted with low latency, which is particularly important for delay-critical data such as voice or streaming video.
AIFS is a time interval between frames being transmitted under the IEEE
802.11e EDCA MAC. It depends on the Access Category and generally depends on the AIFSN, or AIFS-number. AIFS is defined by the formula AIFSN
C* ST + SIFS, where the AIFSN depends on the Access Category. Slot time ST (also denoted by
) is dependent on the physical layer.
Short Interframe Space
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 fra ...
(SIFS) is the time between a DATA and ACK frame.
AIFSN
Cwill be set by the AP in the EDCA Parameter set in beacon and probe response frames. If it is not set then the STA has to use the default values.
The IEEE
802.11e EDCA MAC has been adopted as part of the IEEE
802.11p IEEE 802.11p is an approved amendment to the IEEE 802.11 standard to add wireless access in vehicular environments (WAVE), a vehicular communication system. It defines enhancements to 802.11 (the basis of products marketed as Wi-Fi) required to sup ...
standard for Wireless Access in Vehicular Environments (WAVE).
IEEE 802.11
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