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Arbitration inter-frame spacing (AIFS), in wireless LAN 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 Class and generally depends on the AIFSN, or AIFS-number. AIFS is defined by the formula AIFSN[AC] * ST + SIFS, where the AIFSN depends on the Access Class. Slot time ST (also denoted by ) is dependent on the physical layer. Short Interframe Space (SIFS) is the time between a DATA and ACK frame.

AIFSN[AC] will be set by AP in EDCA Parameter set in beacon and probe response frame. If its not set then STA has to use the default values.

The IEEE 802.11e EDCA MAC has been adopted as part of the IEEE 802.11p standard for Wireless Access in Vehicular Environments (WAVE)

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