Wireless Broadband Technologies: Wimax
The WiMAX framework is based on several core principles:
- Support for different RAN topologies
- Well-defined interfaces to enable 802.16 RAN architecture
independence while enabling seamless integration and
interworking with Wi-Fi, 3GPP3 and 3GPP2 networks.
- Leverage and open, IETF-defined IP technologies
to build scalable all-IP 802.16 access networks using
common off the shelf (COTS) equipment.
- Support for Ipv4 and Ipv6 clients and application
servers, recommending use of Ipv6 in the infrastructure.
- Functional extensibility to support future migration
to full mobility and delivery of rich broadband multimedia.
WiMAX has defined two MAC system profiles the basic ATM
and the basic IP. They have also defined two primary PHY
system profiles, the 25 MHz-wide channel for use in (US
deployments) the 10.66 GHz range, and the 28 MHz wide channel
for use in (European deployments) the 10.66 GHz range.
The WiMAX technical working group is defining MAC and
PHY system profiles for IEEE 802.16a and HiperMan standards.
The MAC profile includes an IP-based version for both wireless
MAN (licensed) and wireless HUMAN (licence-exempt).
IEEE Standard 802.16 was designed to evolve as a set
of air interfaces standards for WMAN based on a common MAC
protocol but with physical layer specifications dependent
on the spectrum of use and the associated regulations.
a. WiMAX Architecture/Network