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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… Like BT + Consume.Net Hot Spot Look at prop. Near Hot Spot Look at dual home clients… MobileMan 6/3/2003 2 level network 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 Work (in ietf) to do base station selection consciously/informed … MobileMan 6/3/2003 Need Router Designation/Discovery 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 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” Need to look at this…Node needs to state (or measure) likely scope… MobileMan 6/3/2003 Eval 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