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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.
In the Wikipedia
article on
3G
there is a table labelled �Overview of 3G/IMT-2000 standards� which
provides information along with links to other Wikipedia articles
providing information on the technologies. In addition, there is a
useful article on
4G
providing useful information and references fir more detailed reading.
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. This process is illustrated
below. 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. |
