ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum
Andres Garcia-Saavedra, Paul Patras, Victor Valls, Xavier Costa-Perez,, and Douglas J. Leith

TL;DR
This paper introduces orthogonal coexistence schemes, ORLA and OLAA, that enable unlicensed LTE to outperform WiFi in throughput without harming WiFi performance, addressing limitations of the current LAA standard.
Contribution
The paper proposes two novel orthogonal coexistence policies, ORLA and OLAA, that improve unlicensed LTE throughput while ensuring fair coexistence with WiFi networks.
Findings
ORLA/OLAA achieve over 200% throughput gains compared to LAA.
WiFi can be more efficient than LAA when aggregating packets.
LAA causes up to 92% throughput loss on WiFi, mitigated by ORLA/OLAA.
Abstract
Future mobile networks will exploit unlicensed spectrum to boost capacity and meet growing user demands cost-effectively. The 3GPP has recently defined a Licensed-Assisted Access (LAA) scheme to enable global Unlicensed LTE (U-LTE) deployment, aiming at () ensuring fair coexistence with incumbent WiFi networks, i.e., impacting on their performance no more than another WiFi device, and () achieving superior airtime efficiency as compared to WiFi. In this paper we show the standardized LAA fails to simultaneously fulfill these objectives, and design an alternative orthogonal (collision-free) listen-before-talk coexistence paradigm that provides a substantial improvement in performance, yet imposes no penalty on existing WiFi networks. We derive two LAA optimal transmission policies, ORLA and OLAA, that maximize LAA throughput in both asynchronous and synchronous (i.e., with…
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