Simulation Modeling and Analysis
Simulation Modeling and Analysis
The Analysis of the Optimal Contention Period for Broadband Wireless Access Network
PERCOMW '05 Proceedings of the Third IEEE International Conference on Pervasive Computing and Communications Workshops
Performance Evaluation of the IEEE 802.16 MAC for QoS Support
IEEE Transactions on Mobile Computing
Comparative Study of the IEEE 802.16 Random Access Mechanisms
NGMAST '07 Proceedings of the The 2007 International Conference on Next Generation Mobile Applications, Services and Technologies
Analysis and performance evaluation of the OFDM-based metropolitan area network IEEE 802.16
Computer Networks: The International Journal of Computer and Telecommunications Networking - Selected papers from the European wireless 2004 conference
Broadband wireless access with WiMax/802.16: current performance benchmarks and future potential
IEEE Communications Magazine
Quality of service support in IEEE 802.16 networks
IEEE Network: The Magazine of Global Internetworking
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The IEEE 802.16 is a leading technology for Broadband Wireless Access (BWA), where a Base Station (BS) provides a set of Subscriber Stations (SSs) with first-mile network access. Each SS has multiple connections directed to the BS, which are assigned bandwidth on a demand basis. Specifically, the BS allocates part of the channel as request slots, which are accessed by best-effort connections in a random access manner to transmit bandwidth requests. Although bandwidth requests sent by different SSs may collide the standard does not specify an explicit acknowledgment mechanism. This, and the bandwidth being assigned by the BS to each SS as a whole, may lead to critical inconsistencies between the perception of the SSs' requirements at the BS and the actual SSs' requirements, which in turn may entail SS service disruption. While the standard suggests that an SS should regularly update the BS about the backlog of its connections, the algorithm to do so is left unspecified. In this paper we propose a simple, yet effective, mechanism to be employed by the SSs, called Bandwidth Request Reiteration (BR2), which prevents deadlock from occurring. Using detailed packet-level simulation, we compare BR2 to an alternative approach based on timeout, and show that BR2 achieves better performance, in terms of the average transfer delay, while it does not incur a significant additional overhead, in terms of MAC signaling.