In view of the continuously growing demands for such new mobile applications as high-rate data

high-quality audio and video data

a novel service-based smart handoff method for Access Point（AP） forwarding mode is proposed.The forwarding mode is dynamically decided by adding a dedicated adjacent AP-state table and a smart handoff module in an AP of a WLAN to decrease transmission delay and improve the user experience of different services so as to optimize the existing handoff mode.Its performance tests are performed in a WLAN laboratory

the results of which prove that the data transmission delay can be dramatically reduced by using this method.