Performance evaluation and parameterization of the IEEE 802.16 contention-based CDMA bandwidth request mechanism for the OFDMA physical layer

Authors:
Dirk Staehle;Rastin Pries;Alexey Vinel;Andreas Mäder
Affiliations:
University of Würzburg, Würzburg, Germany;University of Würzburg, Würzburg, Germany;Russian Academy of Sciences, St. Petersburg, Russian Fed.;NEC Network Laboratories Europe, Heidelberg, Germany
Venue:
Proceedings of the 12th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
Year:
2009

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Abstract

The IEEE 802.16 standard specifies two contention-based mechanisms for the OFDMA physical layer to transmit bandwidth requests from subscriber station to base station: the standard mechanism is based on Slotted Aloha with a truncated binary exponential backoff; the alternative one is based on CDMA. This paper describes the CDMA-based contention mechanism and presents an analytic model to compute its performance in terms of delay and consumed resources. The tunable parameters for the CDMA-based random access procedure are the number of ranging subchannels, the number of codes per ranging subchannels, and the detection threshold. An optimal configuration is derived for a given load in terms of the request arrival rate.