80216d802162004

IEEE 802.16d-2004, commonly referred to as 802.16d or fixed WiMAX, is a standard in the IEEE 802.16 family that defines the air interface and media access control for fixed broadband wireless access networks. It was published by the IEEE Standards Association in 2004 as a revision of the early 802.16 baseline and served as the foundation for fixed WiMAX deployments.

The standard specifies a physical layer based on orthogonal frequency-division multiplexing (OFDM) and a MAC layer with time-division multiple access (TDMA) scheduling to support multiple users in a point-to-multipoint topology. It targets licensed bands in the sub-6 GHz range and supports fixed, line-of-sight and non-line-of-sight operation under suitable conditions. It provides service classes, quality-of-service (QoS) features, and security provisions appropriate for wireless access.

In practice, 802.16d established the baseline for early WiMAX networks, enabling broadband connectivity to residential and small business customers over metropolitan areas. It was designed to be complemented by later amendments and revisions, including mobility-oriented developments, and it influenced subsequent 802.16 standards, such as mobile WiMAX developments that followed.

In summary, 802.16d-2004 represents the fixed WiMAX baseline within the IEEE 802.16 family, outlining the essential air interface, MAC mechanisms, and deployment considerations that enabled fixed wireless broadband access in the mid-2000s and informed later evolutions of the standard.