Centralized Contention Based MAC for OFDMA WLAN

Gunhee LEE  Cheeha KIM  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E100-D   No.9   pp.2219-2223
Publication Date: 2017/09/01
Publicized: 2017/06/06
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2017EDL8078
Type of Manuscript: LETTER
Category: Information Network
Keyword: 
wireless local area networks (WLAN),  IEEE 802.11ax,  orthogonal frequency division multiple access (OFDMA),  UL-OFDMA random access,  medium access control (MAC),  

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Summary: 
The IEEE 802.11 wireless local area network (WLAN) is the most widely deployed communication standard in the world. Currently, the IEEE 802.11ax draft standard is one of the most advanced and promising among future wireless network standards. However, the suggested uplink-OFDMA (UL-OFDMA) random access method, based on trigger frame-random access (TF-R) from task group ax (TGax), does not yet show satisfying system performance. To enhance the UL-OFDMA capability of the IEEE 802.11ax draft standard, we propose a centralized contention-based MAC (CC-MAC) and describe its detailed operation. In this paper, we analyze the performance of CC-MAC by solving the Markov chain model and evaluating BSS throughput compared to other methods, such as DCF and TF-R, by computer simulation. Our results show that CC-MAC is a scalable and efficient scheme for improving the system performance in a UL-OFDMA random access situation in IEEE 802.11ax.