BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//talks.cam.ac.uk//v3//EN
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CATEGORIES:Computer Laboratory Systems Research Group Seminar
SUMMARY:Towards Performant Networking from Low-Earth Orbit
  - Debopam Bhattacherjee\, ETH Zürich
DTSTART;TZID=Europe/London:20220113T150000
DTEND;TZID=Europe/London:20220113T160000
UID:TALK163288AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/163288
DESCRIPTION:\nUpstart space companies are building massive con
 stellations of low-flying satellites to provide In
 ternet service. These developments comprise “one g
 iant leap” in Internet infrastructure\, promising 
 global coverage and lower latency. However\, fully
  exploiting the potential of such satellite conste
 llations requires tackling their inherent challeng
 es: thousands of low-Earth orbit (LEO) satellites 
 travel at high velocities relative to each other\,
  and relative to terrestrial ground stations. The 
 resulting highly-dynamic connectivity is at odds w
 ith the Internet’s design\, which assumes a largel
 y static core infrastructure. Virtually every aspe
 ct of Internet design — physical interconnection\,
  routing\, congestion control\, and application be
 havior — will need substantial rethinking to integ
 rate this new building block.\n\nIn this talk\, I 
 will focus on topology design\, while also briefly
  touching upon the other open networking challenge
 s in this context. Coming to topology design\, we 
 posit that the high density of these new constella
 tions and the high-velocity nature of such systems
  render traditional approaches for network design 
 ineffective\, motivating new methods specialized f
 or this problem setting. We propose one such metho
 d\, explicitly aimed at tackling the high temporal
  dynamism inherent to low-Earth orbit satellites. 
 We exploit repetitive patterns in the network topo
 logy to avoid expensive link changes over time\, w
 hile still providing near-minimal latencies at nea
 rly 2× the throughput of standard past methods.\n\
 nI will also present Hypatia\, a framework for sim
 ulating and visualizing LEO networks\, that we bui
 lt to enable broader research in this area. Using 
 publicly available design details for the upcoming
  networks to drive our framework\, we characterize
  the expected behavior of these networks\, includi
 ng latency and link utilization fluctuations over 
 time\, and the implications of these variations fo
 r congestion control and routing.\n
LOCATION:FW11 and https://cl-cam-ac-uk.zoom.us/j/9721627237
 8?pwd=M2diTFhMTnppckJtNWhFVTBKK0REZz09
CONTACT:Srinivasan Keshav
END:VEVENT
END:VCALENDAR