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

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Title Performance evaluation and parameterization of the IEEE 802.16 contention-based CDMA bandwidth request mechanism for the OFDMA physical layer
Author Dirk Staehle and Rastin Pries and Alexey Vinel and Andreas Mäder
Year 2009
PublicationType Conference Paper
Journal
HostPublication MSWiM '09 : Proceedings of the 12th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
DOI http://dx.doi.org/10.1145/1641804.1641868
Conference 12th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems, Tenerife, SPAIN, OCT 26-29, 2009
Diva url http://hh.diva-portal.org/smash/record.jsf?searchId=1&pid=diva2:587609
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.