AP-initiated multi-user transmissions in IEEE 802.11ax WLANs

English
Publication: 
AP-initiated multi-user transmissions in IEEE 802.11ax WLANs
Publishing date: 
March, 2019
Show in user profiles:: 
kosek's picture
dr hab. inż.
Katarzyna
Kosek-Szott
Ph.D., hab.
profesor nadzwyczajny
room: 
B9/307
phone: 
+48 12 617 35 38
email: 
kosek@kt.agh.edu.pl
www: 
http://home.agh.edu.pl/~kks/index.html
konsultacje: 
wtorek 9:00-10:30
Informacje dodatkowe: 

Katarzyna Kosek-Szott w roku 2006 obroniła z wyróżnieniem pracę magisterską na wydziale EAIiE Akademii Górniczo-Hutniczej w Krakowie. W roku 2011 obroniła z wyróżnieniem pracę doktorską z dziedziny Telekomunikacja na tym samym wydziale. W roku 2016 uzyskała stopień doktora habilitowanego. Obecnie jest zatrudniona na stanowisku profesora nadzwyczajnego w Katedrze Telekomunikacji Akademii Górniczo-Hutniczej w Krakowie. Jej ogólne zainteresowania dotyczą sieci bezprzewodowych, szczególnie najnowszych rozszerzeń standardu IEEE 802.11. Jest recenzentem dla licznych czasopism oraz konferencji międzynarodowych. Była/jest zaangażowana w realizację prac w ramach projektów europejskich:  DAIDALOS II, CONTENT, CARMEN, FLAVIA, PROACTIVE, RESCUE, CANALETTO. Realizowała także prace związane z polskimi grantami. Była kierownikiem projektu finansowanego przez Narodowe Centrum Nauki w ramach programu SONATA. Obecnie jest kierownikiem projektu finansowanego przez Narodowe Centrum Nauki w ramach programu HARMONIA. Jest autorką licznych publikacji. Jest członkiem komitetu redakcyjnego czasopisma Ad Hoc Networks wydawnictwa Elsevier. Pełniła rolę eksperta dla Komisji Eurpejskiej, NCBiR oraz European Research Council (ERC).

Additional information: 

Katarzyna Kosek-Szott received her M.Sc. and Ph.D. degrees in telecommunications (both with honours) from the AGH University of Science and Technology, Krakow, Poland in 2006 and 2011, respectively. In 2016 she received habilitation degree. Currently she is working as an assistant professor at the Department of Telecommunications, AGH University of Science and Technology. Her general research interests are focused on wireless networking. The major topics include wireless LANs (especially the newest amendments to the IEEE 802.11 standard).She is a reviewer for international journals and conferences. She has been involved in several European projects: CANALETTO, DAIDALOS II, CONTENT, CARMEN, FLAVIA, PROACTIVE, RESCUE as well as grants supported by the Polish Ministry of Science and Higher Education. She has also co-authored a number of research papers. Since January 2015 she is a member of the editorial board of the Ad Hoc Networks journal published by Elsevier. She served as an expert for the European Commission and the European Research Council.

Author/s: 
Bellalta B., Kosek-Szott K.
Publication type: 
article
Publisher: 
Elsevier Ad Hoc Networks
vol.: 
85
pages(from-to): 
145-159
Summary: 
Next-generation IEEE 802.11ax Wireless Local Area Networks (WLANs) will make extensive use of multi-user communications in both Downlink (DL) and Uplink (UL) directions to achieve high and efficient spectrum utilization in scenarios with many user stations per access point. It will become possible with the support of Multiuser (MU) Multiple Input, Multiple output (MIMO) and Orthogonal Frequency Division Multiple Access (OFDMA) transmissions. In this paper, we first overview the novel characteristics introduced by IEEE 802.11ax to implement AP-initiated OFDMA and multiuser MIMO (MU-MIMO) transmissions in both DL and UL directions. Namely, we describe the changes made at the Physical (PHY) layer and at the Medium Access Control (MAC) layer to support OFDMA, the use of trigger frames to schedule uplink multi-user transmissions, and the new multiuser RTS/CTS mechanism to protect large multi-user transmissions from collisions. Then, in order to study the achievable throughput of an IEEE 802.11ax WLAN, we use both mathematical analysis and simulations to numerically quantify the gains of MU transmissions and the impact of IEEE 802.11ax overheads on the WLAN saturation throughput. Results show the advantages of using MU transmissions in scenarios with many user stations. Additionally, we provide novel insights on the conditions in which IEEE 802.11ax WLANs are able to maximize their performance, such as the need to provide strict prioritization to AP-initiated MU transmissions to avoid collisions with transmissions from user stations.
publikuj: 
na wszystkich stronach