Researches On Multiple Access Protocols For High Speed Wireless Access System

With the rapid growth of mobile communication and Internet, the last milequestion which offer high speed access to Internet and other communication servicesfor individual has been received wide attention. The researches on wireless accesstechnology become hot. This paper first review the concept, the development and thecritical technology of wireless access. Then various multiple access protocols areexplained and the technologic problems confronted in the current research areproposed. Further the methods of simulation, the modeling of each kinds of trafficsources and the modeling of wireless error channel are presented. Finally User-dependent Perfect-scheduling Multiple Access----UPMA which is used for wirelessInternet access is particularly introduced and applied for wireless ad hoc Internetaccess. Based on the traffic models similar to the WWW applications, theperformance of UPMA is analyzed by computer simulation.