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Uni-MUMAC: a unified down/up-link MU-MIMO MAC protocol for IEEE 802.11ac WLANs

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dc.contributor.author Liao, Ruizhi
dc.contributor.author Bellalta, Boris
dc.contributor.author Cao, Trang Minh
dc.contributor.author Barceló Vicens, Jaume
dc.contributor.author Oliver, Miquel
dc.date.accessioned 2020-04-16T08:54:58Z
dc.date.available 2020-04-16T08:54:58Z
dc.date.issued 2015
dc.identifier.citation Liao R, Bellalta B, Cao TM, Barcelo J, Oliver M. Uni-MUMAC: a unified down/up-link MU-MIMO MAC protocol for IEEE 802.11ac WLANs. Wireless networks. 2014 Nov 30;21:1457-72. DOI: 10.1007/s11276-014-0861-4
dc.identifier.issn 1022-0038
dc.identifier.uri http://hdl.handle.net/10230/44237
dc.description.abstract Due to the dominance of the downlink traffic in Wireless Local Area Networks (WLANs), a large number of previous research efforts have been put to enhance the downlink transmission, namely, from the Access Point (AP) to stations (STAs). The downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) technique, supported by the latest IEEE amendment-802.11ac, is considered as one of the key enhancements leading WLANs to the Gigabit era. However, as cloud uploading services, Peer-to-Peer and telepresence applications get popular, the need for higher uplink capacity becomes inevitable. In this paper, a unified down/up-link Medium Access Control (MAC) protocol called Uni-MUMAC is proposed to enhance the performance of IEEE 802.11ac WLANs by exploring the multi-user spatial multiplexing technique. Specifically, in the downlink, we implement an IEEE 802.11ac-compliant MU-MIMO transmission scheme to allow the AP to simultaneously send frames to a group of STAs. In the uplink, we extend the traditional one round channel access contention to two rounds, which coordinate multiple STAs to transmit frames to the AP simultaneously. 2-nd round Contention Window (CW2nd), a parameter that makes the length of the 2-nd contention round elastic according to the traffic condition, is introduced. Uni-MUMAC is evaluated through simulations in saturated and non-saturated conditions when both downlink and uplink traffic are present in the system. We also propose an analytic saturation model to validate the simulation results. By properly setting CW2nd and other parameters, Uni-MUMAC is compared to a prominent multi-user transmission scheme in the literature. The results exhibit that Uni-MUMAC not only performs well in the downlink-dominant scenario, but it is also able to balance both the downlink and uplink throughput in the emerging uplink bandwidth-hungry scenario.
dc.description.sponsorship This work has been supported by the Spanish Government and the Catalan Government under projects TEC2012-32354 (Plan Nacional I+D), CSD2008-00010 (Consolider-Ingenio Program) and SGR2009#00617
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Springer
dc.relation.ispartof Wireless networks. 2014 Nov 30;21:1457-72
dc.rights © Springer The final publication is available at Springer via http://dx.doi.org/10.1007/s11276-014-0861-4
dc.title Uni-MUMAC: a unified down/up-link MU-MIMO MAC protocol for IEEE 802.11ac WLANs
dc.type info:eu-repo/semantics/article
dc.identifier.doi http://dx.doi.org/10.1007/s11276-014-0861-4
dc.subject.keyword MAC
dc.subject.keyword MU-MIMO
dc.subject.keyword Down/up-link
dc.subject.keyword IEEE 802.11ac
dc.subject.keyword WLANs
dc.relation.projectID info:eu-repo/grantAgreement/ES/3PN/TEC2012-32354
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.type.version info:eu-repo/semantics/acceptedVersion


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