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

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 One hopTwo hop Avg. Throughput 1209.50 Kbps626.89 Kbps  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 * Orinoco data sheet (given error rate < 10 ) -5

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

8. Single Access Point Experiment Result With mobilityWithout mobility Avg. Throughput 671.98 Kbps653.37 Kbps  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 HighLowAverage Avg. Throughput 1215.59 Kbps 920.54 Kbps 1050.55 Kbps  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