6-470: CDMA2000 (also known as C2K or IMT Multi‑Carrier ( IMT‑MC )) is a family of 3G 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-generation cdmaOne (IS-95) set of standards and used especially in North America and South Korea. CDMA2000 compares to UMTS ,
12-756: 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: All are approved radio interfaces for the ITU 's IMT-2000 . In the United States, CDMA2000 is a registered trademark of the Telecommunications Industry Association (TIA-USA). CDMA2000 1X (IS-2000) , also known as 1x and 1xRTT ,
18-598: 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 1.25 MHz 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 153 kbit/s with real world data transmission averaging 80–100 kbit/s in most commercial applications. IMT-2000 also made changes to
24-415: 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). CDMA2000 1xEV-DO (Evolution-Data Optimized) , often abbreviated as EV-DO or EV , is a telecommunications standard for
30-399: The wireless transmission of data through radio signals, typically for broadband Internet access . It uses multiplexing techniques including code-division multiple access (CDMA) as well as time-division multiple access to maximize both individual user's throughput and the overall system throughput. It is standardized (IS-856) by 3rd Generation Partnership Project 2 (3GPP2) as part of
36-529: The CDMA2000 family of standards and has been adopted by many mobile phone service providers around the world – particularly those previously employing CDMA networks. 1X Advanced (Rev.E) is the evolution of CDMA2000 1X. It provides up to four times the capacity and 70% more coverage compared to 1X. 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. CDMA2000 technology
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