Publication: ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum
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ISSN: 1063-6692
Publication date
2018-11-12
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IEEE
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Abstract
Future mobile networks will exploit unlicensed
spectrum to boost capacity and meet growing user demands
cost-effectively. The 3rd Generation Partnership Project (3GPP)
has recently defined a License Assisted Access (LAA) scheme
to enable global Unlicensed LTE (U-LTE) deployment, aiming
at 1) ensuring fair coexistence with incumbent WiFi networks,
i.e., impacting on their performance no more than another
WiFi device; and 2) achieving superior airtime efficiency as
compared with WiFi. 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
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 evaluation
through which we demonstrate that, when aggregating packets,
IEEE 802.11ac WiFi can be more efficient than LAA, whereas
our proposals attains 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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Keywords
Coexistence, Spectrum sharing, Unlicensed LTE, LTE-U, LAA, WiFi, Listen-before-talk
Bibliographic citation
García Saavedra, A., Patras, P., Valls, V., Costa Pérez, X. y Leith., D.J. (2018). ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum. IEEE/ACM Transactions on Networking, 26 (6), pp. 2665-2678.