27-03-2012, 03:44 PM
IEEE Standard 802.16:A Technical Overview of the WirelessMAN™ Air Interface for Broadband Wireless Access
C80216-02_05.pdf (Size: 523.17 KB / Downloads: 35)
ABSTRACT
The broadband wireless access industry, which
provides high-rate network connections to stationary
sites, has matured to the point at which
it now has a standard for second-generation
wireless metropolitan area networks. IEEE Standard
802.16, with its WirelessMAN™ air interface,
sets the stage for widespread and effective
deployments worldwide. This article overviews
the technical medium access control and physical
layer features of this new standard.
INTRODUCTION AND MARKET OPPORTUNITIES
IEEE Standard 802.16-2001 [1], completed in
October 2001 and published on 8 April 2002,
defines the WirelessMAN™ air interface specification
for wireless metropolitan area networks
(MANs). The completion of this standard heralds
the entry of broadband wireless access as a
major new tool in the effort to link homes and
businesses to core telecommunications networks
worldwide.
TECHNOLOGY DESIGN ISSUES MEDIUM ACCESS CONTROL
The IEEE 802.16 MAC protocol was designed
for point-to-multipoint broadband wireless
access applications. It addresses the need for
very high bit rates, both uplink (to the BS)
and downlink (from the BS). Access and bandwidth
allocation algorithms must accommodate
hundreds of terminals per channel, with
terminals that may be shared by multiple end
users. The services required by these end users
are varied in their nature and include legacy
time-division multiplex (TDM) voice and data,
Internet Protocol (IP) connectivity, and packetized
voice over IP (VoIP).
SUMMARY AND CONCLUSION
The WirelessMAN™ air interface specified in
IEEE Standard 802.16 provides a platform for
the development and deployment of standardsbased
metropolitan area networks providing
broadband wireless access in many regulatory
environments. The standard is intended to
allow for multiple vendors to produce interoperable
equipment. However, it also allows for
extensive vendor differentiation.