With the popularity of 3G applications, the WLAN which complements the 3G technology at the access rate and the adaption to the environment develops rapidly, it has become a new generation of high-speed wireless access network, and comes to the fore in the 3G's supplementary technologies. At the same time, With the development of the multimedia technology, the application of multimedia is spreading widely, and people become desiredly demanding on multimedia information which including image, video and etc al. The handoff schemes employed in the WLAN based on 802.11 protocol can no longer meet the strict delay constraints of multimedia applications, so the study on handoff mechanism which meet to the needs of the multimedia has become a very key issue in providing seamless mobile services.In the thesis, we firstly reviewed the development and state-of-art of the handoff in the WLAN based on 802.11 protocol, and made performance evaluation and comparison on the exsiting handoff schemes. These two theories provided foundation stone of researches behind. Then we researched on the smooth handoff algorithm. The algorithm reduces the packet loss rate during the handoff and meet he needs of multimedia applications. However, its showcoming is not adapting to the varied network environment.
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