ABSTRACT
Many countries and organizations have already carried out the research of next-generation mobile communication systems, such as ITU (International Telecommunication Union), European Commission FP (Framework Program), WWRF (Wireless World Research Forum), Korean NGMC (Next Generation
Mobile Committee), Japanese MITF (Mobile IT Forum), and China Communication Standardization Association (CCSA). Some international standards organizations are working for the standards of the E3G (enhanced 3G) and 4G (4th Generation Mobile Communication System), such as the LTE (long term evolution) plan of the 3GPP (3rd Generation Partnership Project) and the AIE (air interface of evolution)/UMB (ultramobile broadband) plan of 3GPP2. The ITU also made the calendar of the 4G communication system, IMT (International Mobile Telecommunications) Advanced. WRC’07 (World Radio-Communication Conference 2007), which was held at the end of 2007, has already allocated multiband spectrum resources for future 4G systems. The 4G is coming.
