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Optimizing Base Station Placement and Routing in Wireless MAN: MobileMan Insights

This document discusses innovative strategies for the placement of 802.11 base stations in a wireless-only metropolitan area network (MAN). Utilizing nodes as routers with peer-to-peer links, it highlights mechanisms for inter-zone routing and the importance of node designation and discovery. The concept of "shadow" nodes is introduced, with various performance evaluation methods, including RF propagation and building surface models. The paper concludes with a call for future work in router election based on movement likelihood, emphasizing the need for collaborative client nodes in efficient network design.

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Optimizing Base Station Placement and Routing in Wireless MAN: MobileMan Insights

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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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