CDMA2000 Wireless Communications System (1)
CDMA2000
Definition:
CDMA2000 (also
known as IMT Multi‑Carrier (IMT‑MC)) is a family of 3G mobile technology standards, which
use CDMA channel access, to send voice, data, and signaling data between mobile phones and cell sites.
The
name CDMA2000 actually denotes a family of standards that represent the
successive, evolutionary stages of the underlying technology. These are, in
order of evolution:
· CDMA2000
1xRTT
· CDMA2000
1xEV-DO: Release 0, Revision A, Revision B
· CDMA2000
1xEV-DO Revision C or Ultra Mobile Broadband (UMB)
· CDMA2000
1xEVDV
Cdma2000 Network architecture:
The CDMA2000 3G wireless systems are based on
the code-division multiple access (CDMA) system. The CDMA2000 system delivers
high-bandwidth data and voice services to users of mobile equipment.
ü BTS: base
transceiver station
ü BSC:
base station controller
ü MSC: mobile switching center
ü PDSN: packet data serving node
ü HA: home agent
ü IWF: interworking function
CDMA2000 Infrastructure Node Architecture:
You can build the
CDMA2000 infrastructure node, which consists of a host processor, adjacent node
interfaces, and switch fabric, on an Internet protocol router.
In Figure, the adjacent node interface and the
switch can be implemented in programmable logic. Together, they form the voice
and data path. An Internet protocol router transports packet voice and data
within the CDMA2000 wireless network.
CDMA2000 Spectrum:
CDMA2000
operates in a relatively small amount of spectrum, 1.25 MHz, in most of the
frequency bands designated by the International Telecommunication Union (ITU)
for the IMT-2000 systems. The smaller 1.25 MHz channel size enables greater
spectrum assignment flexibility to (a) incrementally assign channels as the
demand for capacity increases, and (b) to facilitate in-band migration
deployments which require the clearing of spectrum.
CDMA2000
1X, EV-DO Rel. 0 and Rev. A operate in a paired 2 x 1.25 MHz FDD channel -
compared to other 3G technologies which require a much larger 2 x 5 MHz
channel. By using a narrower radio channel, operators benefit from greater
flexibility and improved cost efficiencies in managing their scarce spectrum
resources. EV-DO Rev. B enables operators to aggregate multiple 1.25 MHz
channels, up to 15 channels in 20 MHz of spectrum, to deliver the
next-generation multi-mega-bits-per-second data connectivity and bandwidth
intensive applications more economically.
Currently,
CDMA2000 network infrastructure and user devices are available in most of the
IMT-2000 frequency bands designated by the ITU, including the 450 MHz, 700 MHz,
800 MHz, 1700 MHz, 1900 MHz, AWS and 2100 MHz bands.
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