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A Distance Routing Effect Algorithm for Mobility (DREAM)*

A Distance Routing Effect Algorithm for Mobility (DREAM)*. Stefano Basagni Irnrich Chlamtac Violet R. Syrotiuk Barry A. Woodward. Outline. Introduction DREAM -Dissemination of Location Information -A model of DREAM -DREAM procedure Simulations and Results

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A Distance Routing Effect Algorithm for Mobility (DREAM)*

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  1. A Distance RoutingEffect Algorithm for Mobility (DREAM)* Stefano Basagni Irnrich Chlamtac Violet R. Syrotiuk Barry A. Woodward

  2. Outline • Introduction • DREAM -Dissemination of Location Information -A model of DREAM -DREAM procedure • Simulations and Results • Conclusion

  3. Introduction • Old problem for Ad hoc network routing: -Proactive: it corresponds to a next hop table lookup, sequence is not explicit; -Reactive: the movement of any node in the sequence renders the path invalid. • A new definition of routing table entry is needed

  4. Dissemination of Location Information(DREAM) • Each node transmits control messages bearing its current location to all the others. (e.g. geographic coordinates; obtained by the use of GPS [7]) • The frequency with which these control messages is determined by: -distance effect -mobility rate

  5. Dissemination of Location Information (control message) • We assign each control packet a life time • A majority of the packets have a “short” life time: short lived packets are sent at highfrequency, and “die” after they have traveled. • Long lived packets, sent less frequently, travel farther through the network.

  6. A Model for DREAM • S sends a message to node R, it refers to its LT (Location Table) in order to retrieve location information about R. • S selects from among its neighbors those nodes that are in the direction of R • It is guaranteed that R can be found with agiven probability p, 0< p <1, following result in that direction.

  7. A Model for DREAM • The time interval from t0 to tl, tl > t0 • x = (tl – t0)v • Node R, whose speed is v, cannot be anywhere outside the circle C • one hop neighbors those nodes A, direction A. lies within the range [θ- α, θ+ α] • Angle α must be chosen in a way that the probability of finding R in the sector S is at least p. • we want to find a minimum value for α

  8. A Model for DREAM (method of finding α)-1

  9. A Model for DREAM (method of finding α)-2

  10. Distance Routing Effect Algorithmfor Mobility (DREAM procedure)

  11. Distance Routing Effect Algorithmfor Mobility (DREAM procedure)

  12. Distance Routing Effect Algorithmfor Mobility (DREAM procedure:Recovery) • Its actual implementation may vary, depending on the characteristic of the network. • For instance, flooding

  13. Simulations Results • Simulated our DREAM protocol using MAISIE [1] • Placing n = 30 nodes randomly on a grid of size 100 x 100. • we assume that each node has the same speed V • given in grid units per 100 ticks of the simulation clock • average end-to-end delay

  14. Conclusions • Simulation results showed that with over 80% probability this method can find a route to a given node. (if any exists) • The average end-to-end delays with respect to the DSR reactive protocol are lower. • DREAM protocol provides loopfree routes, and is robust in providing multiple routes.

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