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Slide 1 - Ant Colony Optimization An adaptative nature inspired algorithm explained, concretely implemented, and applied to routing protocols in wired and wireless networks.
Slide 2 - Plan The ants The double bridge experiment From biological ants to agents Java Implementation Demonstration 1 The different moves of the ants Demonstration 2 Adaptation of the Ants-based algorithm to routing protocols ACO compared to RIP and OSPF Examples of effective implementations Results of the analysed reports Questions
Slide 3 - The ants Can explore vast areas without global view of the ground. Can find the food and bring it back to the nest. Will converge to the shortest path.
Slide 4 - How can they manage such great tasks ? By leaving pheromones behind them. Wherever they go, they let pheromones behind here, marking the area as explored and communicating to the other ants that the way is known. Double Bridge experiment
Slide 5 - Double Bridge experiment
Slide 6 - From biological ants to ant-agent Distributed process: local decision-taking Autonomous Simultaneous Macroscopic development from microscopic probabilistic decisions Problem: adaptation to reality
Slide 7 - From biological ants to ant-agent Solution: Pheromone upgrade: evaporation. Ant aging: after a given time, ants are tired and have to come back to the nest. 2 different pheromones : away (from nest) and back (from source of food).
Slide 8 - Java Implementation Object modeling: Definition of the objects: Ant Playground Traces Playground: central object, contains a list of ants, an array of traces. Manages the processes and the graphical output. Ant: can move by itself, according to the traces around it and a random decision. Traces: amount of pheromones of 2 types, Away and Back.
Slide 9 - Demonstration 1 2-Bridge Experiment Interesting Convergence
Slide 10 - Possible moves of Ants Four types: From home to food Goal has never been reached: moveStraightAwayFromAway(); Goal reached: moveTowardAway(); Back to home Goal has never been reached: moveFromFoodToHome(); Goal reached: moveFromHomeToFood(); Idea: generates several random moves and see which one is the best among them.
Slide 11 - Demonstration 2 A difficult playground
Slide 12 - Adaptation of the Ants-based algorithm to routing protocols Ants will start from A the nest and look for D the food. At every step, they will upgrade the routing tables and as soon as the first one reaches the food, the best path will be known, thus allowing communication from D to A.
Slide 13 - ACO Compared to RIP and OSPF RIP / OSPF: Transmit routing table or flood LSPs at regular interval High routing overhead Update the entire table Based on transmission time / delay ACO algorithm: Can be attached to data Frequent transmissions of ants Low routing overhead Update an entry in a pheromone table independently
Slide 14 - Examples of effective implementations Existing MANET routing protocols: DSDV, OLSR, AODV, DSR, ZRP (Zone Routing Protocol), GPSR (Greedy Perimeter Stateless Routing), TRP (Terminale Routing Protocol) Routing protocols presented in the paper: ABC, Ant Based Control system, for wired networks. AntNet, for MANET. ARA, Ant-Colony-Based Routing Algorithm, for MANET. AntHocNet, for MANET. MARA, Multiple-agents Ants-based Routing Algorithm
Slide 15 - Results of the analysed reports ABC applied to SDH network (30 nodes): the routes are perfectly resumed and alternative possibilities are memorized as well. AntNet in a complex wired network is more efficient than OSPF, and show very stable performances. ARA, for 50 mobile nodes in 1500x300m area, give the same performance than DSR for less overhead traffic. AntHocNet, simulated with QualNet: 100 nodes in 3000x3000m area, radio range of 300m, data rate 2Mbit/s. AntHocNet twice more efficient than AODV to deliver packets, and is more scalable
Slide 16 - Questions ?
Slide 17 - Thank you !