Analysing Wi-Fi/LTE Coexistence to Demonstrate the Value of Risk-Informed Interference Assessment Andra M. Voicu, Ljiljana Simić RWTH Aachen University, Germany J. Pierre de Vries Silicon Flatirons Centre, University of Colorado, USA Marina Petrova, Petri Mähönen RWTH Aachen University, Germany
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Analysing Wi-Fi/LTE Coexistence to Demonstratethe Value of Risk-Informed Interference Assessment
Andra M. Voicu, Ljiljana SimićRWTH Aachen University, Germany
J. Pierre de VriesSilicon Flatirons Centre, University of Colorado, USA
Marina Petrova, Petri MähönenRWTH Aachen University, Germany
• risk-informed interference assessment• e.g. risk assessment for Wi-Fi/LTE coexistence
• no regulatory intervention needed for technical coexistence• better coexistence for Wi-Fi: sometimes with itself; sometimes with LTE• in practice typically negligible interference risk
• risk assessment uses likelihood-consequence for hazard scenarios
• risk assessment in spectrum management*(1) inventory of harmful interference hazard modes(2) define consequence metric(3) assess likelihood and consequence(4) aggregate findings for decision making
*J. P. de Vries, “Risk-informed interference assessment: A quantitative basis for spectrum allocation decisions”, Telecommunications Policy, 2017
Risk Assessment for Wi-Fi/LTE Coexistence:(1) inventory of harmful interference
• throughput degradation increases with the AP density• for regulator: LTE (LAA/LTE-U) is sometimes friend, sometimes foe to Wi-Fi• for engineer: Wi-Fi (high risk, low degradation) vs. LTE (high risk, high degradation)
• for regulator: similar likelihood of LTE being friend or foe to Wi-Fi
Risk Assessment for Wi-Fi/LTE Coexistence:(3) assess likelihood and consequence & (4) aggregate findings• unfairness among incumbents: indoor/indoor, 1 channel, 1-30 entrants
• for engineer: unfairness for incumbents higher with LTE than with Wi-Fi entrants
Risk Assessment for Wi-Fi/LTE Coexistence:(3) assess likelihood and consequence & (4) aggregate findings• throughput degradation: indoor/indoor, different no. of channels, 10 entrants
• throughput degradation decreases when no. channels increases• for regulator & engineer: typical case: 19 channels and sense→ degrada on 0• for engineer: sense better than random for 4 channels
Risk Assessment for Wi-Fi/LTE Coexistence:(3) assess likelihood and consequence & (4) aggregate findings• throughput degradation: different scenarios, 1 channel, 10 entrants
• for regulator: LTE is consistently sometimes friend, sometimes foe to Wi-Fi
Conclusions
• risk-informed interference assessment: comprehensive, intuitive, and quantitative
• for regulator: LTE sometimes friend sometimes foe to Wi-Fi → no interven on needed for technical coexistence
• for engineer: – dense deployments: lower risk when Wi-Fi coexists with Wi-Fi– sparse deployments: lower risk when Wi-Fi coexists with LTE
• in practice typically low risk for Wi-Fi coexisting with LTE-in-unlicensed → no interven on from regulator or engineer