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NSF Ultra Low L NSF Ultra Low L

NSF Ultra Low L - PowerPoint Presentation

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Uploaded On 2017-06-22

NSF Ultra Low L - PPT Presentation

atency in Wireless Workshop Technology Shivendra Panwar PhD work of Menglei Zhang and Nicolas Barati Marco Mezzavilla Sundeep Rangan Jing Zhu Thanasis Korakis Amir Hosseini ID: 562200

802 ieee bandwidth mmwave ieee 802 mmwave bandwidth latency zhang cellular rangan wireless mezzavilla access intermittent initial drop paper zorzi link barati

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Slide1

NSF Ultra Low Latency in Wireless Workshop - Technology

Shivendra PanwarPhD work of Menglei Zhang and Nicolas BaratiMarco Mezzavilla, Sundeep Rangan, Jing Zhu, Thanasis Korakis, Amir Hosseini, Ted Rappaport, Michele Zorzi

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Low latency in the pastWill history repeat itself…Priority queuing – why is it rarely turned on?IEEE 802.4, IEEE 802.11e, IEEE 802.11 PCF….But, MPLS TE widely deployedSlide3

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Is this time different?We have gone from a requirement of ~100 ms to ~1 msFrom 20,000km to 200km over fiberFor cellular this itself means that the core network (EPC in 4G) will have to be re-engineeredSlide4

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WiFiIEEE 802.11ac, ad, ax…. Promise of bandwidths up to 10Gb/sIs CSMA finally dead?Slide5

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5G CellularAir link: Massive MIMO, mmWave, Full DuplexNGMN White Paper promises 1 ms delayBut…US carriers are proceeding cautiouslyFixed wireless access will be the initial 5G applicationDo we need high bandwidth, low latency and mobility simultaneously?Slide6

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Cross-layer Issues for mmWaveGigabit/s bandwidths, but very intermittentmmWave also needs directional transmission to workBuildings, body movement can lead to a drop in bandwidthFirst link technology with high bandwidth and intermittent drops in bandwidth. A challenge for networking researchers.Initial access to form a connection within 1 ms is a requirement (see paper by Nicolas Barati et al. [1])Slide7

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TCP for single pedestrian UE scenario (Menglei Zhang et al. [2])The blockage events were simulated by superimposing the real human blockage measurement traces measured with our sounding equipment over the channel models.Drop-tail

Large congestion window

High buffer occupancy and delay

CoDel

Low buffer occupancy and delay

Rate degradation

Dynamic RW

Best performance

HumanSlide8

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References[1] N Barati, SA Hosseini, M Mezzavilla, S Rangan, T Korakis, SS Panwar and M Zorzi, “Initial Access for Millimeter Wave Cellular Systems,” IEEE Transactions on Wireless Communications , accepted to be published.[2] M Zhang , M Mezzavilla, J Zhu, S Rangan, SS Panwar, “The Bufferbloat Problem over Intermittent Multi-Gbps mmWave Links”