2017 IEEE International Symposium on Parallel and Distributed Processing with Applications and 2017 IEEE International Conference on Ubiquitous Computing and Communications (ISPA/IUCC) (2017)
Dec 12, 2017 to Dec 15, 2017
Distributed Coordination Function (DCF) is a basic MAC protocol used in the world-wide WiFi networks and plays a key role in determining the network performance, especially in situations with a large number of users and high-density Access Point (AP) deployed. To achieve a better understanding of the real-world performance o7 802.11 DCF networks, we have constructed an emulation platform and a prototype testbed for performance evaluation. The design and implementation of these two platforms are discussed in this paper. The key DCF parameters, i.e., the initial contention window size (CWmin) and the maximum contention window size (CWmax), are tuneable so that we are able to study the impact o7 these DCF parameters on the network performance. These experiment results are compared against with a recently proposed unified analytical framework to examine the model assumptions and system performance bottlenecks. Our results demonstrate that by adapting the values of CWmin based on WiFi traffic load, the maximal network throughput can be achieved, and the optimal value of CWmin varies when the network size changes. As a reality check, the emerging software defined WiFi network architecture can be optimized for performance enhancement guided by this unified performance model.
access protocols, multi-access systems, telecommunication traffic, wireless LAN
Z. Chen, D. Fu, Y. Gao and X. Hei, "Performance Evaluation for WiFi DCF Networks from Theory to Testbed," 2017 IEEE International Symposium on Parallel and Distributed Processing with Applications and 2017 IEEE International Conference on Ubiquitous Computing and Communications (ISPA/IUCC)(ISPA-IUCC), Guangzhou, China, 2018, pp. 1364-1371.