Performance Analyses of Uplink MU-OFDMA Hybrid Access MAC in IEEE 802.11ax WLANs.

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Name of the Speaker: Aparna Behara (EE16D038)
Guide: Dr. TG Venkatesh
Venue/Online meeting link:
Date/Time: 2nd December 2022, 11.00 am

Future Wireless Local Area Networks (WLANs) are expected to cater to dense WLAN use case scenarios such as airports, smart homes, outdoor stadiums, etc., having numerous stations (STAs) deployed with diverse traffic requirements. The IEEE 802.11ax is the current WLAN standard proposed to meet these requirements. In this seminar, we discuss the Static and Dynamic resource allocation methodologies of the Multi-User Orthogonal Frequency Division Multiple Access (MU-OFDMA) feature of the IEEE 802.11ax network. In contrast to Static MU-OFDMA, in the case of Dynamic MU-OFDMA system, resource units (RUs) are allocated dynamically between the schedule and random access (RA) RUs based on the heterogeneous traffic requirements of the stations (STAs). We have modeled the Static MU-OFDMA system using the Fluid limit approach and the Dynamic MU-OFDMA system using the Discrete-Time Markov Chain (DTMC) Methodology. The tradeoff between throughput and RA capability (rate of new users accessing the system) of a static & dynamic system are studied and validated against simulation.

Further, we discuss the impact of the non-saturated traffic models, such as the Poisson and Pareto traffic models, on the Throughput of a WLAN system and have also studied the impact of the Multi-TID-based packet aggregation feature on the Throughput of the IEEE 802.11ax WLAN systems.