Transcript NoLo: No Long-haul provider…

NoLo: No Long-haul provider…
Jon Crowcroft
Tom Drummond
CL/Cambridge University
LCE/Cambridge University
MobileMan 6/3/2003
Motivation
Location of 802.11 Base Stations in Wireless Only MAN
Use node as router w/ p2p link to next zone
Mechanism to allocate node as inter-zone route
Use shadows (not shadow pricing)
Performance Evaluation
MobileMan 6/3/2003
Base Station Location…
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Like BT + Consume.Net
Hot Spot
Look at prop. Near Hot Spot
Look at dual home clients…
MobileMan 6/3/2003
2 level network
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Let base stations fight out freq alloc
Alloc a client node to be router (I.e. not ad hoc 802.11
Client has to be multihomed
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Work (in ietf) to do base station selection consciously/informed
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…
MobileMan 6/3/2003
Need Router Designation/Discovery
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Build Ad Hoc IP level
Use multicast a LOT
Client multicast to find router
Router multicast advert
Designation/election protocol…use 802.1d style…(spanning tree
MobileMan 6/3/2003
Leapfrog – hopping from pond to pond
Leapfrog Routing Client Node
Normal DumbClient Node
Designation&
Advertisement
logical
His&hers
packets
Base Stn
Base Stn
Service local clients
MobileMan 6/3/2003
Shadows
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London has a nice skyline
Fractal
Use it….
Place hot spots high up as well as low
“collaborating”/”Cooperating” nodes might subscribe “high” and “low”
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Need to look at this…Node needs to state (or measure) likely scope…
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MobileMan 6/3/2003
Eval
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Use top, middle and bottom of buildings
Have RF propagation model for buildings
Have surface model for ISM band
Have consume.net basestation locations (note they and BT use wireline net to
connect)
MobileMan 6/3/2003
Conclusions
 NoLo
 Not exactly MANET
Router Election based on Likelihood of movement! (less likely to move,
more able to route…)
Nothing to stop one removing base stations later –
Assuming MOST “cell”s have basestation (not quite mainstream for
project!)
Future work
Perf Eval
MobileMan 6/3/2003