The most important thing in communication is to hear what isn’t being said.

—Peter F. Drucker

The IEEE 802.16 standards define only the PHY and MAC layer of wireless MAN networks. The wireless “lower layers” are then expected to connect to other networks such as IP-based networks to provide these networks wireless extensions, mobility, an error-free physical layer, and a service flow based QoS-defined services. This connectivity is expected to happen via the convergence layer of the IEEE 802.16e. Left to its own forces, the IEEE 801.16 standards could lead to a wide range of ways in which networks could be built by using the convergence layer.

If the broadband wireless networks are to develop in the manner the cellular ...

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