Coexistence of LTE and WLAN in Unlicensed Bands: Full-Duplex Spectrum Sensing

Syrjälä, Ville; Valkama, Mikko

doi:10.1007/978-3-319-24540-9_60

Cited by 7 publications

(1 citation statement)

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“…In [41], Sagari introduced an inter-network coordination architecture to solve the bandwidth and channel selection problem when LTE systems access WiFi bands. Coexistence was modeled as a classic opportunistic spectrum access problem in [42], whereby LTE and WiFi users are considered secondary primary users respectively, operating with cognitive full-duplex transceivers that follow a non ETSI-compliant access protocol.…”

Section: Related Workmentioning

confidence: 99%

ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum

García‐Saavedra¹,

Patras

Valls

et al. 2018

IEEE/ACM Trans. Networking

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Future mobile networks will exploit unlicensed spectrum to boost capacity and meet growing user demands costeffectively. The 3GPP has recently defined a Licensed-Assisted Access (LAA) scheme to enable global Unlicensed LTE (U-LTE) deployment, aiming at (i) ensuring fair coexistence with incumbent WiFi networks, i.e., impacting on their performance no more than another WiFi device, and (ii) 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-beforetalk 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 alignment to licensed anchor frame boundaries) modes of operation, respectively. We present a comprehensive performance evaluation through which we demonstrate that, when aggregating packets, IEEE 802.11ac WiFi can be more efficient than 3GPP LAA, whereas our proposals can attain 100% higher throughput, without harming WiFi. We further show that long U-LTE frames incur up to 92% throughput losses on WiFi when using 3GPP LAA, whilst ORLA/OLAA sustain >200% gains at no cost, even in the presence of non-saturated WiFi and/or in multi-rate scenarios.

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Section: Related Workmentioning

confidence: 99%