Abstract
The delayed channel access (DCA) protocol is an improved version of IEEE 802.11 DCF. In DCA, a node first waits for an extra delay before it enters the normal DCF procedure, so that more packets can be backlogged and transmitted upon each transmission opportunity. Therefore, DCA is of great practical importance in improving channel utilization. However, how the extra delay affects the performance of DCA has never been theoretically investigated. In this paper, we propose a theoretical model to characterize the impact of a deterministic extra delay on collision probability, throughput, and MAC delay. We find that the system performance is significantly affected by the relationship between the deterministic delay and the number of nodes and can be well predicted by our model. The extensive ns2 simulations verify that our model is very accurate.
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This work is partially supported by the NNSF of China for contract 61373027 and NSF of Shandong Province for contract ZR2012FM023, Macao Science and Technology Development Fund under Grant (No. 013/2014/A1 and No. 104/2014/A3).
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Feng, L., Yu, J., Cheng, X., Wang, S. (2015). Impact of a Deterministic Delay in the DCA Protocol. In: Xu, K., Zhu, H. (eds) Wireless Algorithms, Systems, and Applications. WASA 2015. Lecture Notes in Computer Science(), vol 9204. Springer, Cham. https://doi.org/10.1007/978-3-319-21837-3_14
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DOI: https://doi.org/10.1007/978-3-319-21837-3_14
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