1xEV-DV, which is short for CDMA2000 1xEV-DV, is a third generation (3G) standard developed to compete against the Evolution-Data Optimized (CDMA2000 1xEV-DO) standard. It was an innovation of a number of cellular wireless telecommunication companies such as Nokia, Motorola, Qualcomm and Lucent.
"1x" stands for "one time," while "EV-DV" stands for "Evolution-Data and Voice." 1xEV-DV was named as such due to its channel structure being backwards compatible with IS-95 and IS-2000 (CDMA2000 1xRTT), hence enabling it to address both data and voice.
Compared to 1xEV-DO, which required an overlay network when deployed in mixed mode and was only able to address data natively, the aforementioned feature of 1xEV-DV’s channel structure allowed an in-band network deployment. This feature of the 1xEV-DV network made it favorable over 1xEV-DO among traditional operators with existing voice networks.
1xEV-DV has two versions; namely, "Revision C" and "Revision D." Revision C featured higher speeds for "download" or forward link, but the speed for its "upload" or reverse link is exactly the same as the 1xRTT standard. Revision D featured higher speeds in both forward link and reverse link, and it also integrated Mobile Equipment Identifiers (MEID) natively. This made Revision D well-suited for applications such as video conferencing and file uploading.
Among newer operators who did not have existing 1x voice networks, 1xEV-DO was preferable since it was more flexible with regards to pilot structures, reverse link silence periods, and improved control channels, among other features. These were all available to 1xEV-DO since it did not have to be backward compatible, unlike 1xEV-DV.
Another disadvantage 1xEV-DV had in comparison to 1xEV-DO was its higher network cost, since it required an SS7 network and complex network switches such as a mobile switching center (MSC). 1x-EVDO only used an IP network.
At the time of its commercial release, 1xEV-DV compatible equipment was not made available in time to meet market demands. 1xEV-DO equipment and mobile application-specific integrated circuits (ASIC), however, were already available. This was a large contributing factor to the lack of appeal of 1xEV-DV to consumers and operators.
In addition to this, a number of telecommunications networks such as Verizon Wireless and Sprint Nextel, among others, chose to deploy 1xEV-DO. This led to the suspension in 1xEV-DV chipset development by Qualcomm in March 2005.