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
Download Presentation The PPT/PDF document "NSF Ultra Low L" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
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
1Slide2
2
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
3
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
4
WiFiIEEE 802.11ac, ad, ax…. Promise of bandwidths up to 10Gb/sIs CSMA finally dead?Slide5
5
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
6
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
7
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
8
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”