Though WiMAX faces several key challenges in the Asia Pacific market, its subscriber base will grow from over 80,000 in 2005 to over 3.8 mln by 2009, reports In-Stat. In 2009, Asia Pacific WiMAX subscribers will account for 45% of the world total. South Korea is estimated to contribute over 40% of the regional WiMAX equipment revenue in 2009, followed by China with 34% and Japan with 17%. South Korea will also boast the highest WiMAX service revenue in 2009, due to its sophisticated broadband content/application industry, which results in higher ARPU. By 2009, Asia/Pacific WiMAX equipment spending will account for $1,988.2 mln.