NDLI: Analysis of asymmetric hidden node problem in IEEE 802.11ax heterogeneous WLANs

Content Provider	IEEE Xplore Digital Library
Author	Mvulla, J. Eun-Chan Park Adnan, M. Ju-Hyung Son
Copyright Year	2015
Description	Author affiliation: Dept. of Inf. & Commun. Eng., Dongguk Univ. - Seoul, Seoul, South Korea (Mvulla, J.; Eun-Chan Park; Adnan, M.) \|\| WILUS Inst. of Stand. & Technol., Seoul, South Korea (Ju-Hyung Son)
Abstract	In this paper, we investigate issues of fairness and spatial reuse in heterogeneous wireless local area networks (WLANs) based on IEEE 802.11ax. According to discussions in the evolving IEEE 802.11ax standardization, the value of carrier sensing threshold (CSTH) needs to be increased, in order to improve spectral efficiency of WLANs by means of spatial reuse. We reveal a serious problem of unfairness, referred to as asymmetric hidden node problem, arising when legacy devices that have smaller CSTH coexist and compete for channel access with new devices that have larger CSTH; legacy devices hardly access the wireless channel and the channel is mostly occupied by new devices. The reasons of this problem are analyzed from two viewpoints of asymmetry of carrier sensing and unintended operation of binary exponential backoff. We also show that this problem is not effectively resolved by the ready-to-send/clear-to-send (RTS/CTS) mechanism, which is a well-known solution to the hidden node problem. Via simulation study, we validate this problem and evaluate the trade-off between spatial reuse and fairness with respect to the value of CSTH.
Starting Page	539
Ending Page	544
File Size	730746
Page Count	6
File Format	PDF
e-ISBN	9781467371162
DOI	10.1109/ICTC.2015.7354605
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-28
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless communication Spatial reuse Wireless LAN Wireless sensor networks IEEE 802.11ax Interference Throughput Carrier sensing Sensors Hidden node IEEE 802.11 Standard Fairness
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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