em: Technology Management for Mobile Communications Saad Z. Asif © 2011 John Wiley & Sons, Ltd. ISBN: 978-0-470-74746-9 Next Generation Mobile Communications Ecosystem EVDO (Rev B) EVDO (Rev A) EVDO (Rev 0) CDMA2000 1X (3G) cdmaOne (2G) 1994-1998 Figure 5.1 CDMA evolution 5.2 1xEV-DO (Revisions 0 and A) The EV-DO is one of the leading Wireless IP WAN (Wide Area Network) technologies. The first revision of EV-DO called cdma2000 1xEV-DO Revision 0 was standardized in 2000. 1xEV-DO Revision 0 mainly improves the downlink data rates of cdma2000 1X and has been deployed in many countries around the world. The following Revision A that was standardized in early 2004 not only increases data rates in the downlink but also adds a number of enhancements in the uplink. Neither of the two revisions support circuit switched voice but Rev. A has the capability to support Voice over Internet Protocol (VoIP). These two revisions are based on single carrier methodology and have been standardized by North American TIA (Telecommunications Industry Association) as TIA-856. These systems normally operate in 850 and 1900 MHz frequency bands. EV-DO Rev. A deployment is currently taking place in many countries including Argentina, Guam, Pakistan, USA, and SO on. 5.2.1 1xEV-DO Architecture The 1xEV-DO architecture model consists of the following functional units as shown in Figure 5.2. Rev. 0/A/B of EV-DOEV-DO systems are based on the same architecture. Some basic terminology is as follows: Access Terminal (AT): AT is a device that provides data connectivity to a user. An access terminal may be connected to a computing device such as a laptop personal computer or may be a self-contained data device such as a personal digital assistant. Air Interface Sector Access Terminal Access Network Figure 5.2 Architecture reference model. Reproduced from C 2004 TIA [3] 3GPP2 CDMA2000 1xEV-DO Access Network (AN): The Access Network equipment provides data connectivity between packet data network (typically the Internet) and the access terminal. Secto