What is AIFSN (Arbitration Interframe Space Number)?

This is a term utilized in Institute of Electrical and Electronics Engineers 802.11 organizations which are assisting the QoS (Quality of Service) upgrades initially characterized in the 802.11e standard. This is sent from the Access Point, and is utilized by a station to decide the particular Arbitration Interframe Space value for each of the four EDCA (Enhanced Distributed Channel Access) classes.