HANDOFF TECHNIQUES FOR 4G MOBILE WIRELESS INTERNET

G network is a network of emerging various networks such as CDMA2000, Wireless LAN and WCDMA into all IP-based networks that will make it globally available. 4G technology is a very complex technology of integrat ing different new techniques, and 4G services for a higher speed wireless internet access. In the near future, wide variety of wireless networks will be merged into the internet and allow users to continue their application with higher degree of mobility. In such environment, wireless mobile internet that are anticipated to deliver service to a mobile terminal "anywhere at anytime", which further requires an efficient handoff. Whereas conventional handoff techniques support single connection terminals that operate within a homogeneous network, 4G wireless systems promise to support terminals with multiple connections carrying different types of traffic, with varying quality of service constraints, which may handoff between different tiers of the same network, or between different types of networks. In this paper, new handoff techniques are proposed to support wireless mobile internet with quality of service constraints within 4G wireless systems. This proposal will include handoff architecture and algorithm which try to combine cellular network for uplink traffic services and 802.11b Wi-Fi network for downlink traffic service during and after handoff according to internet characteristics which uplink traffic services is one of fourth of downlink traffic service.