This article is about the mobile phone technology. For the channel access method, see Code-division multiple access.
CDMA2000 (also known as C2K or IMT Multi‑Carrier (IMT‑MC)) is a family of 3G[1] mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is developed by 3GPP2 as a backwards-compatible successor to second-generationcdmaOne (IS-95) set of standards and used especially in North America and South Korea.
CDMA2000 compares to UMTS, a competing set of 3G standards, which is developed by 3GPP and used in Europe, Japan, China, and Singapore.
The name CDMA2000 denotes a family of standards that represent the successive, evolutionary stages of the underlying technology. These are:
CDMA2000 1X (IS-2000), also known as 1x and 1xRTT, is the core CDMA2000 wireless air interface standard. The designation "1x", meaning 1 times radio transmission technology, indicates the same radio frequency (RF) bandwidth as IS-95: a duplex pair of 1.25MHz radio channels. 1xRTT almost doubles the capacity of IS-95 by adding 64 more traffic channels to the forward link, orthogonal to (in quadrature with) the original set of 64. The 1X standard supports packet data speeds of up to 153kbit/s with real world data transmission averaging 80–100kbit/s in most commercial applications.[3] IMT-2000 also made changes to the data link layer for greater use of data services, including medium and link access control protocols and quality of service (QoS). The IS-95 data link layer only provided best-effort delivery for data and circuit switched channel for voice (i.e., a voice frame once every 20 ms).
The CDMA Development Group states that, as of April 2014, there are 314 operators in 118 countries offering CDMA2000 1X and/or 1xEV-DO service.[7][needs update]
History
CDMA2000 technology was developed by Qualcomm in the late 1990s as an enhancement to the CDMA standard.
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.[8]
This section needs expansion. You can help by adding to it. (March 2011)
Patent licensing
In 2007, Qualcomm provided a global patent license for CDMA2000 to the Chinese company Teleepoch.[9]
CDMA2000 Overviews of the CDMA2000 standards - 1X to UMB
cdma2000.info Online interactive cdma2000 SDU decoder - covers all releases up to C.S0005-F 2.0
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