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Ad Hoc Probe

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AdHoc Probe: Path Capacity Probing in Wireless Ad Hoc Networks
Definition ,[object Object],[object Object]
Ad hoc path capacity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Neighborhood example ,[object Object],[object Object],[object Object],solid-line circle: effective receive range ( D r ) from node 4 dotted-line circle: interference range ( D i ) caused by node 4 Distance between nodes: 200m
Neighborhood Capacity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why Path Capacity? ,[object Object],[object Object],[object Object]
Example Scenario ,[object Object],[object Object],[object Object],[object Object]
Ad Hoc probe: end to end measurement tool ,[object Object],Receiver Sender Bottleneck PP PP measure PP measure PP
CapProbe Background: Packet Pair Dispersion Capacity = (Packet Size) / (Dispersion) T 3 T 2 T 3 T 3 T 1 T 3 Narrowest Link 20Mbps 10Mbps 5Mbps 10Mbps 20Mbps 8Mbps
Issues: Compression and Expansion ,[object Object],[object Object]
CapProbe (Rohit et al, SIGCOMM’04) ,[object Object],[object Object],[object Object],Capacity
Capacity Estimation in Ad Hoc Wireless Networks ,[object Object],[object Object],[object Object],[object Object]
What do we actually measure? ,[object Object],[object Object],[object Object],[object Object]
Effective Capacity of 802.11b ,[object Object],[object Object],[object Object]
Previous Work (Li et al) ,[object Object],[object Object]
AdHoc Probe ,[object Object],[object Object],[object Object]
One-way vs Round-trip estimates ,[object Object],Immediate response packet of first probing packet will conflict with the second probing packet!
Multihop path simulation 1 hop 2 hop 3 hop 4 hop 5 hop 6 hop 7 hop AP dispersion 2 sender back to back packets wired Internet wireless multihop dispersion 1
Grid Topology ,[object Object],[object Object],CT: horizontal direction CT: horizontal & vertical directions a b
Simulation of mobile hosts ,[object Object],[object Object],[object Object]
Simulation of mobile end hosts ,[object Object],[object Object],[object Object],0 600 1200 1800 2200 2600 2800 3000
Testbed Measurements (WiTMeMo’05) ,[object Object],[object Object],[object Object],[object Object]
Experiment Results (1) ,[object Object]
Experiment Results (2) ,[object Object]
Experiment Results (3) ,[object Object],[object Object]
Experiment Results (4) ,[object Object]
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object]

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Ad Hoc Probe

  • 1. AdHoc Probe: Path Capacity Probing in Wireless Ad Hoc Networks
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  • 9. CapProbe Background: Packet Pair Dispersion Capacity = (Packet Size) / (Dispersion) T 3 T 2 T 3 T 3 T 1 T 3 Narrowest Link 20Mbps 10Mbps 5Mbps 10Mbps 20Mbps 8Mbps
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  • 18. Multihop path simulation 1 hop 2 hop 3 hop 4 hop 5 hop 6 hop 7 hop AP dispersion 2 sender back to back packets wired Internet wireless multihop dispersion 1
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