Description: With its promise of a target transmission
range of up to 30 miles and a
target transmission rate of more
than 100 Mbps, WiMAX—the
commercialization of the evolving IEEE 802.16
standard—is the latest hot technology. A recent
amendment boosted the protocol’s mobility support,
making it even more attractive to roaming users.
The standard specifies both a common physical
layer and a media access control (MAC) layer
for WiMAX networks, but to make such networks
more usable and reliable, several security issues
must be addressed first. In this article, we introduce
the security protocols used in WiMAX networks
and discuss the problems they confront
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