ABSTRACT
The IEEE 802.16 Working Group began the development of a new amendment to the IEEE 802.16 baseline standard in January 2007 as an advanced air interface, in order to materialize the ITU-R vision for the IMT-Advanced systems as laid out in Recommendation ITU-R M.1645 [1]. The requirements for the IEEE 802.16m standard were selected to ensure competitiveness with the emerging 4th-generation radio access technologies, while extending and significantly improving the functionality and efficiency of the legacy system. The areas of improvement and extension included control/signaling mechanisms, overhead reduction, coverage of control and traffic channels at the cell-edge, downlink/uplink link budget, air-link access latency, client power consumption, transmission and detection of control channels, scan latency and network entry/reentry procedures, downlink and uplink subchannelization schemes, MAC management messages, MAC headers, support of the FDD duplex scheme, advanced single-user MIMO (SU-MIMO) and multiuser MIMO (MU-MIMO) techniques, relay, femto-cells, enhanced multicast and broadcast, enhanced location-based services, and self-configuration networks.
