HiSWANa is the newest of the three WLAN standards in the 5GHz band and has a MAC structure similar to that of HiperLAN
/2. But, unlike HiperLAN
does not offer direct-link mode (which allows terminals to transmit to one another without routing through an AP). HiSWANa
also uses a listen-before-talk mechanism similar to 802.11a to reduce uncoordinated interference. The HiSWANa
MAC combines key features of both 802.11a and HiperLAN
/2, at the expense of increased overhead.
-- Stephan Pietzko - 28 Aug 2003