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Unicast Performance Analysis of Extended ODMRP in a Wired-to-Wireless Hybrid Ad-Hoc Network

This study evaluates the performance of Extended ODMRP (On-Demand Multicast Routing Protocol) in a hybrid ad-hoc network. It discusses the advantages and drawbacks of ODMRP, presents a wired-to-wireless testbed setup, and presents experimental results with and without mobility.

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Unicast Performance Analysis of Extended ODMRP in a Wired-to-Wireless Hybrid Ad-Hoc Network

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  1. Unicast Performance Analysis of Extended ODMRP in a Wired-to-Wireless Hybrid Ad-Hoc Network Sang Ho Bae Sungwook Lee Mario Gerla UCLA Computer Science {sbae, swlee, gerla}@cs.ucla.edu

  2. ODMRP Overview • Sources build routes on demand by flooding • Update and maintain only active routes • Less traffic overhead compared with proactive schemes • Flooding overhead & longer delays because of route acquisition latency • Developed on Linux version 2.2.12 with kernel level multicast support • Running over IEEE 802.11 device (2.4 GHz) • Implemented both unicast and multicast • Wired to ad hoc wireless extension

  3. S S S S D D D D D D D D Routing Example Source Node Join Query S Destination Nodes Join Reply D

  4. Wired-to-Wireless Testbed • FTP server on top of Solaris 8 • Wired-to-Wireless Gateway has 10/100 ethernet card and orinoco 802.11 pcmcia card • Wireless nodes are Dell Inspiron 4000 laptops with 1GHz P3 running Mandrake 8.1 Linux • Wireless channel with 2Mbps and RTS/CTS

  5. Reference Experiment without Mobility • Wired to multihop wireless network with static route • FTP from MR1 to CH (wireless one hop) • FTP from MH to CH (wireless two hop) MH : Mobile Host MR : Mobile Router WWR : Wire-to-Wireless Router IG : Internet Gateway CH : Corresponding Host

  6. Reference Experiment Result • Less throughput than optimal bandwidth (1.59Mbps)* due to environmental noise and link condition • Results depend on the signal strength • Optimal locations are chosen for equal signal strength and multihop topology • Avg. throughput for the two hop transmission  ½ avg. throughput for the single hop -5 * Orinoco data sheet (given error rate < 10 )

  7. Single Access PointExperiment • Wired to multihop wireless network with dynamic routing • FTP from MH to CH MH : Mobile Host MR : Mobile Router WWR : Wire-to-Wireless Router IG : Internet Gateway CH : Corresponding Host

  8. Single Access Point Experiment Result • Same topology with the reference experiment • Routes are generated dynamically by ODMRP • Routing overhead is negligible • With mobility, avg. throughput increases due to the change of number of hops • Packet loss due to route change triggers slow-start resulting in further reduction in throughput

  9. Multiple Access Points Experiment MH : Mobile Host MR : Mobile Router WWR : Wire-to-Wireless Router IG : Internet Gateway CH : Corresponding Host

  10. Multiple Access Point Experiment Result • The results vary from trial to trial due to the link conditions between nodes • In trial 1, immediate change from MR1 to WWR1 and remained in one-hop condition • In trial 2, MH has been routed through MR1 and MR2 for the longer period of time • Extended ODMRP can provide equivalent throughput as in static wired network with minimal overhead

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