Design of performance analysis model for efficient random access protocol in CDMA based OFDMA-PHY system

Currently, IEEE 802.16a wireless MAN supports the contention based OFDMA-CDMA ranging subsystem for ranging operation (initial ranging, periodic ranging, bandwidth request). This system is basically similar to slotted ALOHA (K. Leonard and S.S. Lam, April 1975), but the frame size (code-slot/frame) allocated for random access or ranging request is relatively big and can be altered by the dynamic adjustment of downlink and uplink subframe size on the MAC frame of OFDMA-PHY system. In this paper, the design performance analytical model for correct interpretation of ranging subsystem is presented. Until now, the Internet traffic study have achieved wire net, but there is still a need for Internet traffic study that correctly reflects the radio environment. In this paper, the performance analysis result of this paper can perform the reference mark for random access protocol in OFDMA-CDMA ranging system. Traffic modeling can also be used to prepare the network resources in radio networks