The IEEE 802.16 standard is designed to provide a system for fixed and mobile broadband wireless access. Mobility operation is added with IEEE 802.16e-2005 amendment for frequencies below 6 GHz.
In the previous chapter, we discussed the OFDMA physical layer of the standard. Now, we introduce the medium access layer (MAC) where it defines access in two ways: point-to-multipoint (PMP) and mesh type of communication. PMP access is a one-hop wireless communication between a base station (BS) that has a direct connection to the network and plurality of mobile stations (MSs). Downlink transmission from BS to MSs is broadcast and uplink transmissions from MSs to BS are unicast. BS acts as the central point to facilitate downlink and uplink access for a particular mobile station. BS allocates burst regions within a frame for an MS to send or receive data. MS knows these allocated regions by decoding the MAP portion of each frame where it can learn the burst region that is destined to it in the downlink, and to find out the dedicated region in the uplink for it to place a transmission.
KeywordsHome Agent Bandwidth Request Idle Mode Target Base Station Sleep Window
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