A Soloution For Designing ۴G Networks In Urban Areas

International Mobile Telcommunications-Advanced (IMT-Advanced) or alternatively ۴th Generation (۴G) Cellular Systems are mobile systems that extend and improve upon the capabilities of the IMT-۲۰۰۰ family of standards. Such systems are expected to provide users with access to a variety of advanced IP-based services and applications, supported by mobile and fixed broadband networks which are predominantly packet-based.۴G networks can support a wide range of data rates with different quality of services requirements. Proportional to user mobility conditions in multiuser environments. WiMax embodies the IEEE ۸۰۲.۱۶ family of standards that provision wireless broadband access. with the IEEE ۸۰۲.۱۶e – ۲۰۰۵ or IEEE ۸۰۲.۱۶m  mobility amendement, WiMax promise to address the ever increasing demand for mobile high speed Wireless data in forth – generation (۴G) network. It provides wireless broadband and IP connectivity for the “first-mile to last mile” connection. In this paper we proposed a solution for designing ۴G Networks by mobile wimax technology in urban with an intelligent Medium Access Control (MAC) that adapts with the Physical layer (PHY) to provides requirements ۴G  . In our scheme we present ۲۴ scenario with different parameters. The performance of proposed scheme is evaluate by simulation using Opnet.