Path toward next generation wireless Internet - cellular mobile 4G WLAN/WPAN and IPv6 backbone

Combination of the exponential growth of Internet and the explosive increase of wireless Internet marks the trend-an increasing demand for wireless Internet. This work discusses next generation wireless Internet, mainly focusing on the next generation cellular mobile system 4G (4th Generation), WLAN (Wireless Local Area Network)/WPAN (Wireless Personal Area Network) for future, and IPv6 backbone of future network. For 4G, its definition and features are discussed, also some of its trends are presented after the example of NTT DoCoMo's success and the analyses of competition of i-mode vs. WAP. For WLAN/WPAN, some standards and specifications, such as IEEE802.11, IEEE802.15, homeRF, HIPERLAN2, Bluetooth, etc., are compared and some prospects are proposed. For IPv6 backbone, its advantages and the way to realize it are considered. The paper concludes with some tendencies worldwide from the viewpoint of technology and market.