WiMax hasn’t been seen as a serious threat to 3G or many of the existing technologies. That is, until now. The WiMax forum is planning an FDD profile for Mobile WiMax which may see the light of day as early as 6 months from now and would provide stiff competition to the competing standards. From this TechWorld article:
FDD WiMax could well be pitched head-on against HSPA, EVDO, LTE and other 3G technologies in the 2.5Ghz band….
