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There are multiple
radio access technologies used in IMT. As of
WRC-07,
the list is:
�CDMA-Direct
Spread (Universal Terrestrial Radio Access-UTRA)
�CDMA-Multi
Carrier (CDMA2000)
�CDMA
TDD (UTRA TDD)
�TDMA
Single Carrier (UWC (Universal Wireless Communication)-136)
�FDMA/TDMA
(Digital Enhanced Cordless Communications-DECT)
�OFDMA
TDD WMAN (WiMAX)
Currently under study
are technologies for Long Term Evolution (LTE) and LTE-Advanced (LTE-A.)
See �More Information� at left for links to additional detail.
ITU-R Recommendation
M.1457-9
(May 2010) �5 indicates the radio interfaces for the terrestrial
component of IMT-2000 as listed above and also indicates that an
overview of each radio interface is provided in ��5.1.1, 5.2.1, 5.3.1,
5.4.1, 5.5.1 and 5.6.1 of
M.1457-9.
These sections refer to specifications transposed by the 3GPP and 3GPP2
Organizational Partners into national or regional specifications which
are then submitted to ITU-R for referencing. The level of detail in the
referenced documents is relevant to those who are deeply immersed in the
implementation of the technologies, or are doing research and
development in their various aspects.
Other sources provide
substantive but less detailed information on the radio access
technologies. The following
Wikipedia
articles should be treated as informative and unsuitable for decision
making or specifying purchases:
�CDMA
is a general article on code division multiple access technology
�FDMA/TDMA
(Digital Enhanced Cordless Communications-DECT)
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