The first version of the IEEE 802.16 protocol was
completed in October 2001. This version was called IEEE
802.16-2001 [1] and it defines the air interface and medium
access control (MAC) protocol for a wireless metropolitan
area network (WMAN). It was intended for high-bandwidth
wireless voice and data for residential and enterprise use. At
the beginning of its development, this protocol was oriented
to fixed wireless users with line of sight (LOS) in the 11-66
GHz spectrum range