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Fixed WiMAX deployments do not cater for handoff between Base Stations, therefore the service provider cannot offer mobility. This is a phrase frequently          used to refer to systems built using 802.16-2004 ('802.16d') and the OFDM PHY          as the air interface technology.

Mobile WiMAX implementations can be used to deliver both fixed and mobile services.A phrase frequently used to refer to systems built using 802.16e-2005          and the OFDMA PHY as the air interface technology.