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NoLo: No Long-haul provider…

NoLo: No Long-haul provider…. Jon Crowcroft CL/Cambridge University Tom Drummond LCE/Cambridge University. 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

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NoLo: No Long-haul provider…

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  1. NoLo: No Long-haul provider… Jon Crowcroft CL/Cambridge University Tom Drummond LCE/Cambridge University MobileMan 6/3/2003

  2. 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

  3. Base Station Location… • Like BT + Consume.Net • Hot Spot • Look at prop. Near Hot Spot • Look at dual home clients… MobileMan 6/3/2003

  4. 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

  5. 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

  6. Normal DumbClient Node Designation& Advertisement logical Base Stn Base Stn His&hers packets Service local clients Leapfrog – hopping from pond to pond Leapfrog Routing Client Node MobileMan 6/3/2003

  7. 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 tostate (or measure) likely scope… MobileMan 6/3/2003

  8. 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

  9. 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

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