IEEE 802.16m is an amendment to the released IEEE802.16-2009 Standard. The goal set out in 802.16m is to develop an advanced air interface to meet the requirements for IMT-Advanced next generation networks while still supporting legacy 802.16 OFDMA system. This application note will focus on some of the key features of 16m and provide comparisons to the 802.16-2009 OFDMA PHY (also referred to as 16e.) with explanations of the motivations behind for the advanced features in 802.16m.