KDDI will introduce EV-DO Rev.A that enhances the function of the CDMA2000 1x EV-DO method, which is the infrastructure for their data communication on au cellphones, by the end of 2006. It is assumed that with the construction of an “Ultra 3G” network, the fixed movement integrated communication infrastructure will enable improved connection speed of up to 3.1Mbps service. The decision for this next generation standard was made at a recent 3GPP2 meeting in the United States by joint proposal of 29 major telecomm equipment manufacturer companies worldwide.
A present CDMA2000 1x EV-DO method is developed by the end of 2006 and EV-DO Rev.A that enhances the function is developed one by one. In Rev.A, the data communication speed is sped up to descending 3.1Mbps and going up 1.8Mbps, and the quality control of the delayed inhibition etc. of packet transmission becomes possible. See KDDI’s Press Release Here