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SUMMARY:Towards Performant Networking from Low-Earth Orbit - Debopam Bhatt
 acherjee\, ETH Zürich
DTSTART:20220113T150000Z
DTEND:20220113T160000Z
UID:TALK163288@talks.cam.ac.uk
CONTACT:Srinivasan Keshav
DESCRIPTION:\nUpstart space companies are building massive constellations 
 of low-flying satellites to provide Internet service. These developments c
 omprise “one giant leap” in Internet infrastructure\, promising global
  coverage and lower latency. However\, fully exploiting the potential of s
 uch satellite constellations requires tackling their inherent challenges: 
 thousands of low-Earth orbit (LEO) satellites travel at high velocities re
 lative to each other\, and relative to terrestrial ground stations. The re
 sulting highly-dynamic connectivity is at odds with the Internet’s desig
 n\, which assumes a largely static core infrastructure. Virtually every as
 pect of Internet design — physical interconnection\, routing\, congestio
 n control\, and application behavior — will need substantial rethinking 
 to integrate this new building block.\n\nIn this talk\, I will focus on to
 pology design\, while also briefly touching upon the other open networking
  challenges in this context. Coming to topology design\, we posit that the
  high density of these new constellations and the high-velocity nature of 
 such systems render traditional approaches for network design ineffective\
 , motivating new methods specialized for this problem setting. We propose 
 one such method\, explicitly aimed at tackling the high temporal dynamism 
 inherent to low-Earth orbit satellites. We exploit repetitive patterns in 
 the network topology to avoid expensive link changes over time\, while sti
 ll providing near-minimal latencies at nearly 2× the throughput of standa
 rd past methods.\n\nI will also present Hypatia\, a framework for simulati
 ng and visualizing LEO networks\, that we built to enable broader research
  in this area. Using publicly available design details for the upcoming ne
 tworks to drive our framework\, we characterize the expected behavior of t
 hese networks\, including latency and link utilization fluctuations over t
 ime\, and the implications of these variations for congestion control and 
 routing.\n
LOCATION:FW11 and https://cl-cam-ac-uk.zoom.us/j/97216272378?pwd=M2diTFhMT
 nppckJtNWhFVTBKK0REZz09
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