CDMA2000

CDMA2000 is a family of mobile telecommunications standards for 3G networks developed by 3GPP2, based on the CDMA (code division multiple access) radio interface and built on the earlier IS-95 (cdmaOne) standard. It was designed to deliver higher data rates and improved capacity for both voice and data on licensed spectrum. CDMA2000 is part of the ITU IMT-2000 family of 3G technologies and is distinguished from other IMT-2000 options by its CDMA air interface and its evolution path stemming from IS-95.

The standard defines several radio interfaces, most notably CDMA2000 1xRTT, which provides circuit-switched voice and basic data services, and CDMA2000 1xEV-DO, which targets high-speed data transmissions. EV-DO has been extended through revisions such as Rev A and Rev B, which increase peak throughput and improve uplink performance and multi-carrier capabilities. Data rates vary widely by revision and network deployment, ranging from hundreds of kilobits per second on 1xRTT to multiple megabits per second on EV-DO networks. CDMA2000 utilizes forward and reverse links with power control, supporting both voice and data sessions simultaneously.

CDMA2000 networks have seen extensive deployment in North America, parts of Asia, and other regions, often alongside or in place of rival 3G technologies. As the industry shifted toward higher-speed solutions such as LTE, many operators migrated data traffic away from CDMA2000 while maintaining legacy voice and roaming interoperability in some markets. The standard is defined by 3GPP2 in the IS-2000 family, evolving from the IS-95/cdmaOne lineage.

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