RT Journal Article
T1 ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum
A1 García Saavedra, Andrés
A1 Patras, Paul
A1 Valls, Víctor
A1 Costa Pérez, Xavier
A1 Leith, Douglas J.
AB Future mobile networks will exploit unlicensedspectrum to boost capacity and meet growing user demandscost-effectively. The 3rd Generation Partnership Project (3GPP)has recently defined a License Assisted Access (LAA) schemeto enable global Unlicensed LTE (U-LTE) deployment, aimingat 1) ensuring fair coexistence with incumbent WiFi networks,i.e., impacting on their performance no more than anotherWiFi device; and 2) achieving superior airtime efficiency ascompared with WiFi. We show the standardized LAA fails tosimultaneously fulfill these objectives, and design an alternativeorthogonal (collision-free) listen-before-talk coexistence paradigmthat provides a substantial improvement in performance, yetimposes no penalty on existing WiFi networks. We derive twooptimal transmission policies, ORLA and OLAA, that maximizeLAA throughput in both asynchronous and synchronous (i.e.,with alignment to licensed anchor frame boundaries) modes ofoperation, respectively. We present a comprehensive evaluationthrough which we demonstrate that, when aggregating packets,IEEE 802.11ac WiFi can be more efficient than LAA, whereasour proposals attains 100% higher throughput, without harmingWiFi. We further show that long U-LTE frames incur up to92% throughput losses on WiFi when using 3GPP LAA, whilstORLA/OLAA sustain >200% gains at no cost, even in thepresence of non-saturated WiFi and/or in multi-rate scenarios.
PB IEEE
SN 1063-6692
YR 2018
FD 2018-11-12
LK https://hdl.handle.net/10016/28424
UL https://hdl.handle.net/10016/28424
LA eng
NO This work was supported in part by the EC H2020 5G-Transformer Project under Grant 761536.
DS e-Archivo
RD 5 jul. 2024