Enhancements to the CDMA wireless cellphone technology that allow data to be transmitted. In 2000, CDMA2000 was the first 3G technology to be commercially deployed as part of the ITU's IMT-2000 framework (see IMT-2000). By 2006, the CDMA Development Group (CDG) reported that the international CDMA2000 subscriber base had surpassed 185 million users.
1xRTT
The first version of CDMA2000 provides data rates of 307 Kbps (downlink) and 153 Kbps (uplink) as well as twice the voice capacity on a single 1.25 MHz CMDA channel in new or existing spectrum. The use of the single channel is known as "1X" or "1xRTT" (1X Radio Transmission Technology). It is also known as "IS-2000," "MC-1X," and "IMT-CDMA MultiCarrier 1X."
1xEV (1xEV-DO and 1xEV-DV)
1xEV technology provides higher speeds implemented in two phases. Phase 1 is Evolution-Data Only (1xEV-DO), which increases the downlink peak data rate to 2.4 Mbps. The average rate a user experiences is between 300 and 600 Kbps. 1xEV-DO Revision A supports IP packets, increases the downlink to 3.1 Mbps and boosts uplink dramatically to 1.2 Mbps.
Phase 2 is Evolution-Data Voice (1xEV-DV), which integrates voice and data on the same carrier with rates up to 4.8 Mbps.
3x
CDMA2000 3x uses three 1.25 MHz CDMA channels. It is part of the CDMA2000 specification for countries that require 5 MHz of spectrum for 3G use. CDMA2000 3X is also known as "3XRTT," "MC-3X," and "IMT-CDMA MultiCarrier 3X." See CDMA, WCDMA and cellular generations.
1X Signal Strength
The \"1X\" is the 1xRTT signal strength on this cellphone, which is only one bar at this moment. The \"EV\" signal, also one bar, is the 1xEV-DO channel. As the phone travels, the strength of the two signals may differ.
1xRTT
The first version of CDMA2000 provides data rates of 307 Kbps (downlink) and 153 Kbps (uplink) as well as twice the voice capacity on a single 1.25 MHz CMDA channel in new or existing spectrum. The use of the single channel is known as "1X" or "1xRTT" (1X Radio Transmission Technology). It is also known as "IS-2000," "MC-1X," and "IMT-CDMA MultiCarrier 1X."
1xEV (1xEV-DO and 1xEV-DV)
1xEV technology provides higher speeds implemented in two phases. Phase 1 is Evolution-Data Only (1xEV-DO), which increases the downlink peak data rate to 2.4 Mbps. The average rate a user experiences is between 300 and 600 Kbps. 1xEV-DO Revision A supports IP packets, increases the downlink to 3.1 Mbps and boosts uplink dramatically to 1.2 Mbps.
Phase 2 is Evolution-Data Voice (1xEV-DV), which integrates voice and data on the same carrier with rates up to 4.8 Mbps.
3x
CDMA2000 3x uses three 1.25 MHz CDMA channels. It is part of the CDMA2000 specification for countries that require 5 MHz of spectrum for 3G use. CDMA2000 3X is also known as "3XRTT," "MC-3X," and "IMT-CDMA MultiCarrier 3X." See CDMA, WCDMA and cellular generations.
1X Signal Strength
The \"1X\" is the 1xRTT signal strength on this cellphone, which is only one bar at this moment. The \"EV\" signal, also one bar, is the 1xEV-DO channel. As the phone travels, the strength of the two signals may differ.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Wanted: Alcatel-Lucent new leaders to fix merger debacle
- Wanted: Alcatel-Lucent new leaders to fix merger debacleRelying on CDMA sales? LOL. CDMA is dead.Verizon Half of Sprint Nextel is IDEN, Japans' KDD, Korea Telecom, and India's Tata TeleServices are the last remaining CDMA strong holds. The rest of the world has moved to GSM and related technologies and this...
- Discussion threads 2008-07-29
- A closer look at the HTC Shift from Sprint
- I've been using an HTC Shift from Sprint for over a week now and as you can see in the more than 140 photos and screenshots found in my image gallery and quick and dirty post yesterday I have had a chance to try out most all aspects of the...
- Blog posts 2008-03-20
- More 3G options for HP, Lenovo laptops
- The news out of GSMA Mobile World Congress in Barcelona isn't all cell phones. Qualcomm announced that HP will ship several business laptops this year using its Gobi 3G chipset. Gobi is notable because it is a single chipset that works with both types of 3G networks,...
- Blog posts 2008-02-14
- Palm announces the Centro for US$99
- Today Palm introduced the long rumored Palm Centro that will sell for a low US$99 on Sprint. While the device may not knock the socks off of the smartphone enthusiast, the Centro is a very capable Palm OS 5.4.9 device. Specs include a 320x320 color display, dual-band CDMA2000 EV-DO with...
- Blog posts 2007-09-27
- The iPhone might never be free of AT&T
- The iPhone might never be free of AT&THardware lock???? er NoDoes any GSM only phone work on an CDMA2000 network??? er... No.Is AT&T the only network that it will be released on??? er No.Have you forgotten about the rest of the world? err YesIf the iPhone isn't cracked before...
- Discussion threads 2007-07-05
- The iPhone might never be free of AT&T
- I've been taking a look around the web at the efforts by hackers to free the iPhone from the AT&T shackles so that it could be used as an iPod or with other network providers, both in the US and abroad. I've come to the conclusion that while it might...
- Blog posts 2007-07-05
- iPhone activation and sync
- iPhone activation and syncwowDidn't now the iPhone had 80 Gb ;)Apple does it againOnce again, we see Apple taking a product, or in this case a process, designed by other companies and making it vastly better. No, Apple didn't invent signing up for cel phone service, but damn, sitting...
- Discussion threads 2007-06-26
- TCP Over CDMA2000 Networks: A Cross-Layer Measurement Study
- Modern cellular channels in 3G networks incorporate sophisticated power control and dynamic rate adaptation which can have a significant impact on adaptive transport layer protocols, such as TCP. Though there exists studies that have evaluated the performance of TCP over such networks, they are based solely on observations at the...
- White papers 2007-02-09
- On the Detection of Signaling DoS Attacks on 3G Wireless Networks
- Third Generation (3G) wireless networks based on the CDMA2000 and UMTS standards are now increasingly being deployed throughout the world. Because of their complex signaling and relatively limited bandwidth, these 3G networks are generally more vulnerable than their wireline counterparts, thus making them fertile ground for new attacks. This paper...
- White papers 2007-01-29
- Video to Go: The Effects of Mobility on Streaming Media in a CDMA2000 1xEV-DO Network
- This paper experimentally examines the performance of streaming media applications over a CDMA2000 1xEVDO network. The performance of streaming in a cellular network is tested across three different levels of mobility, two applications, and the two transport layer protocols, TCP and UDP. Findings of this study are that streaming applications...
- White papers 2007-01-01
- Distributed Uplink Scheduling in CDMA Networks
- As mobile devices grow more powerful and diverse in the applications they run, it becomes increasingly desirable to give them some independence in scheduling their transmissions. The latest release of the CDMA2000 1xEV-DO system incorporates a number of mechanisms that afford mobile devices some flexibility in making uplink transmission decisions....
- White papers 2006-12-13
- Development of a CDMA2000 (3G1x)-Based Radio Network Controller Node
- The company wanted to develop the customer's CDMA2000 (3G1x) RNC product line in joint development partnership with the customer's Indian center and enhance the existing RNC code as well as deliver complex features under stringent time-to-market requirements. The challenge was to enhance the components to improve the performance and stability...
- Case studies 2006-10-25
- Thursday's Mobile Review Roundup
- Our reviews team was very busy with a bunch of new mobile products in the last day. Here's some of what our reviews team published in the last 24 hours:The big screen of handhelds? Creative's Zen Vision W video review here: It almost looks more like an OQO (that...
- Blog posts 2006-09-14
- On the Interaction Between TCP and the Wireless Channel in CDMA2000 Networks
- In the wok discussed in this paper, the authors conducted extensive active measurements on a large nationwide CDMA2000 1xRTT network in order to characterize the impact of both the Radio Link Protocol and more importantly, the wireless scheduler, on TCP. Measurements include standard TCP/UDP logs, as well as detailed RF...
- White papers 2006-06-09
- CDMA 2000 EV-DO Revision B
- CDMA2000 is a 3G technology consisting of voice and data traffic. Voice traffic is often referred to as CDMA 2000 1X and data as CDMA EV-DO. The CDMA 2000 delivers the highest voice efficiency in the wireless industry, and EV-DO is clearly the market leader for high speed wireless mobile...
- White papers 2006-05-01
- The Role of CDMA2000 in the Success of Wireless Broadband
- Technology businesses move quickly. And the operator's role is not an easy one. They must stay abreast of complex technology advancements - many of which sound impressive when an excited electrical engineer is describing their merits, but don't translate easily to market dynamics and "Needs." The operators that can match...
- White papers 2006-05-01
- Cisco CDMA2000 Packet Data Services
- This paper describes Cisco CDMA2000 Packet Data Services, a standards-based, cost-effective solution that allows mobile operators to deliver feature-rich packet data services in a Code Division Multiple Access CDMA environment. This paper includes the Cisco Packet Data Serving Node PDSN; home agent and foreign agent functions; an Authentication, Authorization, and...
- White papers 2006-02-01
- China's new 3G cellular standard finally upgraded
- After a lengthy delay, China has finally approved its 3G standards for cellular service reports the Mercury News. China has 35 million cellphone users and a has a huge potential for new markets. The government said it would begin to grant licenses in the middle of 2006. Officials have...
- Blog posts 2006-01-09
- 50 mln 3G subscribers in July 2005
- Wireless handset component makers are scrambling to support some challenging market trends including the proliferation of 3G services, reports In-Stat. By mid-2005, the number of 3G subscribers (CDMA2000 1X EV-DO & WCDMA) exceeded 50 mln. The rollout of 3G services has created pressure for carriers to earn cellular data revenue,...
- Blog posts 2005-12-15
- Delivering Voice and Data: Comparing CDMA2000 and GSM/GPRS/EDGE/UMTS
- Regardless of the wireless technology used, the same rule applies: The more subscribers, minutes and megabytes that a cell site can handle, the lower the operator's cost to deliver those services. Lower overhead costs in turn determine the operator's ability to price voice and data services competitively and still turn...
- White papers 2005-12-01
Premier Vendor Content Whitepapers, webcasts & resources from our Power Center Sponsors
- Intel IT Data Center Efficiency Initiative - Going Green
-
"See how Intel is consolidating down to 8 global data center hubs through the use of consolidation, virtualization and standardization. The initiative is expected to save Intel $1.8B by project completion.
- See how Intel plans to save $1.8 billion >>
- BNET Industries
- Check out BNET's newest resource for managers and executives. Need to do research on your competitors? Don't have time to read every trade pub? BNET Industries is the new source for daily news, insights, and research on 11 major industries and 9,000 public companies.
-
- The technology industry from a different angle
-
- See what's hot in the auto industry
-
- Stay on top of the energy industry
