Search results for " NR-U"

showing 2 items of 2 documents

Downlink channel access performance of NR-U: Impact of numerology and mini-slots on coexistence with Wi-Fi in the 5 GHz band

2020

Coexistence between cellular systems and Wi-Fi gained the attention of the research community when LTE License Assisted Access (LAA) entered the unlicensed band. The recent introduction of NR-U as part of 5G introduces new coexistence opportunities because it implements scalable numerology (flexible subcarrier spacing and OFDM symbol lengths), and non-slot based scheduling (mini-slots), which considerably impact channel access. This paper analyzes the impact of NR-U settings on its coexistence with Wi-Fi networks and compares it with LAA operation using simulations and experiments. First, we propose a downlink channel access simulation model, which addresses the problem of the dependency an…

Networking and Internet Architecture (cs.NI)FOS: Computer and information sciencesUplink channelSettore ING-INF/03 - TelecomunicazioniComputer Networks and Communicationsbusiness.industryComputer scienceOrthogonal frequency-division multiplexingComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS5G NR-U Coexistence IEEE 802.11 LTE LAA Unlicensed bands020206 networking & telecommunications02 engineering and technology91A06 91A10 91A80SubcarrierScheduling (computing)Computer Science - Networking and Internet ArchitectureC.2.0C.2.50202 electrical engineering electronic engineering information engineering020201 artificial intelligence & image processingC.2.0; C.2.5business5GComputer networkCommunication channelComputer Networks
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Using self-deferral to achieve fairness between Wi-Fi and NR-U in downlink and uplink scenarios

2022

Wireless networks operating in unlicensed bands generally use one of two channel access paradigms: random access (e.g., Wi-Fi) or scheduled access (e.g., LTE License Assisted Access, LTE LAA and New Radio-Unlicensed, NR-U). The coexistence between these two paradigms is based on listen before talk (LBT), which was, however, designed for random access. Meanwhile, scheduled systems require that their transmissions start at the beginning of a slot boundary. Synchronizing this boundary to the end of LBT usually requires transmitting a reservation signal (RS) to block the channel. Since the RS is a waste of channel resources, we investigate an alternative self-deferral approach (gap-based access…

Wi-Fi LAA NR-U Coexistence Machine learningSettore ING-INF/03 - TelecomunicazioniComputer Networks and CommunicationsComputer Communications
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