9/28/13 CDMA2000 - Wikipedia, the free encyclopedia

en.wikipedia.org/wiki/CDMA2000 1/3

Huawei CDMA2000 EVDO USB

wireless modem

CDMA2000From Wikipedia, the free encyclopedia

CDMA2000 (also known as IMT Multi‑Carrier (IMT‑MC)) is a

family of 3G[1] mobile technology standards, which use CDMA channelaccess, to send voice, data, and signaling data between mobile phonesand cell sites. The name CDMA2000 actually denotes a family ofstandards that represent the successive, evolutionary stages of theunderlying 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

All are approved radio interfaces for the ITU's IMT-2000. CDMA2000 has a relatively long technical history andis backward-compatible with its previous 2G iteration IS-95 (cdmaOne). In the United States, CDMA2000 is a

registered trademark of the Telecommunications Industry Association (TIA-USA).[2]

Contents

1 1X

2 1xEV-DO

3 1X Advanced4 Networks

5 History

6 References

7 External links

1X

CDMA2000 1X (IS-2000), also known as 1x and 1xRTT, is the core CDMA2000 wireless air interfacestandard. The designation "1x", meaning 1 times Radio Transmission Technology, indicates the same radiofrequency (RF) bandwidth as IS-95: a duplex pair of 1.25 MHz radio channels. 1xRTT almost doubles thecapacity of IS-95 by adding 64 more traffic channels to the forward link, orthogonal to (in quadrature with) theoriginal set of 64. The 1X standard supports packet data speeds of up to 153 kbit/s with real world data

transmission averaging 80–100 kbit/s in most commercial applications.[3] IMT-2000 also made changes to the datalink layer for greater use of data services, including medium and link access control protocols and QoS. The IS-95data link layer only provided "best efforts delivery" for data and circuit switched channel for voice (i.e., a voiceframe once every 20 ms).

9/28/13 CDMA2000 - Wikipedia, the free encyclopedia

en.wikipedia.org/wiki/CDMA2000 2/3

BlackBerry smartphone displaying

'1XEV' as the service status in the

upper right corner.

1xEV-DO

Main article: Evolution-Data Only

CDMA2000 1xEV-DO (Evolution-Data Only), often abbreviated asEV-DO or EV, is a telecommunications standard for the wirelesstransmission of data through radio signals, typically for broadbandInternet access. It uses multiplexing techniques including code divisionmultiple access (CDMA) as well as time division multiple access(TDMA) to maximize both individual user's throughput and the overallsystem throughput. It is standardized by 3rd Generation PartnershipProject 2 (3GPP2) as part of the CDMA2000 family of standards andhas been adopted by many mobile phone service providers around theworld – particularly those previously employing CDMA networks. It is

also used on the Globalstar satellite phone network.[4]

1X Advanced

1X Advanced is the evolution of CDMA2000 1X. It provides up to four

times the capacity and 70% more coverage compared to 1X.[5]

Networks

See also: List of CDMA2000 networks

The CDMA Development Group states that, as of May 2012, there are 329 operators in 121 countries offering

CDMA2000 1X and/or 1xEV-DO service.[6]

History

The intended 4G successor to CDMA2000 was UMB (Ultra Mobile Broadband); however, in November 2008,

Qualcomm announced it was ending development of the technology, favoring LTE instead.[7]

References

1. ^ "What really is a Third Generation (3G) Mobile Technology"(http://web.archive.org/web/20110607105523/http://www.itu.int/ITU-D/imt-2000/DocumentsIMT2000/What_really_3G.pdf). International Telecommunications Union. Archived from theoriginal (http://www.itu.int/ITU-D/imt-2000/DocumentsIMT2000/What_really_3G.pdf) on 2011-06-07. Retrieved2012-10-28.

2. ^ CDMA2000 trademark application (http://tess2.uspto.gov/bin/showfield?f=doc&state=4001:kets67.2.3),uspto.gov, November 17, 2009

3. ^ 1X features/speeds (http://www.cdg.org/technology/3g_1X.asp), cdg.org, November 17, 2009

4. ^ Globalstar GSP 1700 satphone also loaded with EVDO (http://www.engadgetmobile.com/2006/11/09/globalstar-gsp-1700-satphone-also-loaded-with-ev-do/)

5. ^ CDMA2000 | 3G Wireless (http://www.qualcomm.com/solutions/wireless-networks/technologies/1x-advanced).