Future wireless Internet access will be dominated by 3G wide area cellular networks and hot spot wireless LANs. Wired connections usually provide high speed, reliable access to the Internet; wireless network technology enables users to access customized Internet services even when they are moving. If a user wishes to have an uninterrupted Internet service, while frequently switching from one network connection to another, a seamless handoff solution with low latency and low packet loss is mandatory [Ling-Jyh Chen et al]. Wireless technology eradicated the limitation of users mobility and device portability. Among various wireless access technology wireless LAN and cellular network have turned out to be the most widely deployed infrastructures providing mobile access to voice and data services upon users needs. Moving from one subnet to another causes a handoff. During handoff, a mobile node point of attachment to the fixed network is transferred to another. This causes a disruption in the ongoing data flow. If handoff is not handled properly, it causes user perceivable degradation of quality of service.We have analyzed and compare different protocol for handoff, by introducing new features.

Key words: WLAN,UMTS, Handoff, MIP,mSCTP