3g engineers are engineers engaged in 3G communication technology industry, and they are professionals who focus on 3gdci digital content application, while software development engineers in mobile value-added field are relatively new industries. At present, GSM and CDMA networks are used in China: GSM equipment adopts frequency division multiple access, CDMA adopts code division spread spectrum technology, and advanced power and voice activation can provide at least three times the capacity of GSM network. The industry regards CDMA technology as the mainstream technology of 3G, and ITU has determined three wireless interface standards, namely CDMA2000, WCDMA and TD-SCDMA. In other words, CDMA in China can smoothly transition to 3G network. The main feature of 3G is that it can provide mobile broadband multimedia services, including 144kbit/s in high-speed mobile environment, 384kbit/s in walking and slow mobile environment, and 2Mbit/s in indoor environment.