Efficient Multihop Broadcast

Bernát Wiandt

Budapest University of Technology and Economics

With distributed Heuristic evolution

Mobile, ad hoc, no global knowledge

Reaching a global goal with local interactions

Good heuristics (APF[1], GOSSIP[2]) can approximate complicated protocols quite well

Local measurements

but we can approximate global measurements

[1] Vilmos Simon, László Bacsárdi, Sándor Szabó, Daniele Miorandi: “BIONETS: a new vision of opportunistic networks”, IEEE WRECOM 2007, Rome, Italy, 1-2 October, 2007 [2] Li Li Zygmunt J. Haas, Joseph Y. Halpern.: “Gossip-based ad hoc routing”, IEEE/ACM Transactions on Networking (TON), Volume 14 Issue 3, June 2006

Natural selection?

Genetic programming!

- Mixing heuristic properties - Adaptation to the environment

Custom programming language

Heuristic = Event handlers Event handler = list of instructions Stack based

+ Genetic operators won't mess with the syntax + Simple + Designed specifically for the task

Heuristics communicate with each other

disseminating messages in the network

+ reward useful messages

- punish duplicate ones

Nodes measure heuristics' performance

Populations Renew Periodically

- Each iteration means new, more adapted heuristics - Heuristics evolve

- Heuristics wander in the system

Measurements - ref

Measurements - ev

Conclusion Innovative solution

Adaptive to changing environment

Optimizes it’s own performance

Thank you for your

attention!