Traffic characteristics based performance analysis model for efficient random access in OFDMA-PHY system

Authors:
Hyun-Hwa Seo;Byung-Han Ryu;Choong-Ho Cho;Hyong-Woo Lee
Affiliations:
Department of Mobile Transmission Technology Research, Electronics and Telecommunication Research, Institute, Daejeon, Korea;Department of Mobile Transmission Technology Research, Electronics and Telecommunication Research, Institute, Daejeon, Korea;Department of Computer and Information Science;Department of Electronics and Information Engineering, Korea University, Choongnam, Korea
Venue:
WWIC'05 Proceedings of the Third international conference on Wired/Wireless Internet Communications
Year:
2005

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Abstract

Currently, IEEE 802.16a wireless MAN supports the contention based OFDMA-CDMA ranging subsystem for ranging operation (Initial Ranging, Periodic Ranging, Bandwidth Request)[1]. This system uses essentially the slotted ALOHA protocol. However, the number of code-slots/frame for random access transmission tends to be much greater than one and a simple Markov chain analysis may not be numerically feasible. At the same time, the frame size in number of code-slots may be dynamically adjusted based on the traffic load. In order to evaluate delay-throughput performance and stability measure of the random access protocol, we first examine the possible traffic load to be carried throughput the ranging subchannel. We the present performance analysis and numerical examples.