1 / 10

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

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. ODMRP Overview. Sources build routes on demand by flooding Update and maintain only active routes

dori
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related