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PERFORMANCE EVALUATION OF COMMON POWER ROUTING FOR AD-HOC NETWORK

PERFORMANCE EVALUATION OF COMMON POWER ROUTING FOR AD-HOC NETWORK. Zhan Liang Supervisor: Prof. Sven-Gustav Häggman Instructor: Researcher Boris Makarevitch Helsinki University of Technology Communications Laboratory 18th, May, 2004. Contents. Background Objectives Introduction

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PERFORMANCE EVALUATION OF COMMON POWER ROUTING FOR AD-HOC NETWORK

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  1. PERFORMANCE EVALUATION OF COMMON POWER ROUTING FOR AD-HOC NETWORK Zhan Liang Supervisor: Prof. Sven-Gustav Häggman Instructor: Researcher Boris Makarevitch Helsinki University of Technology Communications Laboratory 18th, May, 2004

  2. Contents • Background • Objectives • Introduction • Implementation • Evaluation of COMPOW • Conclusion • Future Work

  3. What is Ad-hoc • A local area network, or some small networks, parts are time-limited, and only usable for the duration of a communication session • The routers are free to move randomly, organize themselves arbitrarily • The wireless topology vary rapidly and unpredictably

  4. Background • Many power control methods are designed and implemented over Ad-hoc network’s routing protocols (CLUSTERPOW, COMPOW, MINPOW, etc.) • Few evaluation reports on the power control methods can be found

  5. Why power control methods? • A big effect on improving network capacity • A higher transmit power: • a higher range and a higher signal-to-noise ratio to the receiver • more interference to the adjacent nodes. • Power control  reduce the interfering nodes  improve the capacity • Energy Savings

  6. Objectives • To implement a common power control method (COMPOW) over one Ad-hoc network’s routing protocol, AODV • To evaluate this power control method

  7. Introduction • Ad-hoc routing protocols • Power control methods

  8. Ad-hoc routing protocols(1) • Table-driven: all the nodes know the routing information of the whole network • Source-initiated: routes are established only when the source nodes require them

  9. Ad-hoc routing protocols(2)

  10. Table-driven routing protocols Destination-Sequenced Distance-Vector (DSDV) • To find the shortest paths, the least hops • A routing table where all the routing information is stored

  11. Source-initiated routing protocols(1)Dynamic Source Routing (DSR) • A route cache to cache the known routes to the destinations • Main routing functions: • Route discovery • Route maintenance

  12. Source-initiated routing protocols(2)Ad-hoc On-Demand Distance Vector (AODV) (1) • A combination of both DSR and DSDV protocols • The basic route-discovery and route-maintenance of DSR, • The hop-by-hop routing, sequence numbers and beacons of DSDV

  13. Source-initiated routing protocols(3)Ad-hoc On-Demand Distance Vector (AODV) (2) • Route discovery:

  14. Power control methods(1) • COMPOW (COMmon POWer) control method • CLUSTERPOW (CLUSTERing POWer) control method • MINPOW (MINimum POWer) control method

  15. Power control methods(2)COMPOW • All the nodes use the same power level, the lowest power level at which the network is connected

  16. Power control methods(3)CLUSTERPOW • To separate nodes into several different clusters

  17. Power control methods(3)MINPOW • Each node chooses the transmit power level

  18. Implementation of COMPOW(1)Simulation Assumptions (1) • Simulation Environment: NS2 • Network card: CISCO Aironet 350 • The channel is bi-directional link • The free space loss with two ray ground reflection model

  19. Implementation of COMPOW(2)Simulation Assumptions (2) • The antennas are omni directional (same gain and attenuation in all horizontal directions) • The MAC layer protocol: IEEE 802.11b

  20. Implementation of COMPOW(3)COMPOW over AODV: Route Discovery procedure

  21. Implementation of COMPOW(4)Architecture

  22. Implementation of COMPOW(5)Functions included in Simulation • Route Discovery • Route Maintenance • Route Release • Route Error handle

  23. Evaluation of COMPOWTesting Scenarios • Scenario 1: 10 fixed nodes, 10 pairs of connection, 100 seconds, 250 m^2 • Scenario 2: 25 fixed nodes, 25 pairs of connection, 100 seconds, 625 m^2 • Scenario 3: 25 mobile nodes, 25 pairs of connection, 1000 seconds, 1000*1000 m^2

  24. Results:Throughput vs. Load for fixed nodes (TCP)

  25. Results:Throughput vs. Load for fixed nodes (UDP)

  26. Results:Energy Consumption vs. Load for fixed nodes (TCP)

  27. Results:Energy Consumption vs. Load for fixed nodes (UDP)

  28. Results:Throughput vs. Load for mobile nodes

  29. Results:Energy Consumption vs. Load for mobile nodes

  30. Conclusions • A network transmitting packets by TCP: COMPOW performs good • A network transmitting packets by UDP: the lifetime of the COMPOW network may be even shorter than that of the network without using power control methods

  31. Future works • More complicated scenarios’ test  acquire a complete evaluation • Non-uniform load generation environment • Other Ad-hoc routing protocols  a more complete evaluation of COMPOW

  32. Q & A Thank you for your attention!

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