overview of the orbit radio grid testbed for evaluation of next-generation wireless network...
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Overview of the ORBIT Radio Grid Testbed
for Evaluation of Next-Generation
Wireless Network ProtocolsD.Raychaudhuri, M.ott, S.Ganu, K.ramachandran,
H.Kremo, R.Siracusa, H.Liu, Singh WINLABReviewed by Lee YoungSoo
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Motivation There is great deal of research activ-
ity on future wireless/sensor net-works and application. Do not capture real physical layer ef-
fects. ORBIT aims to provide a flexible,
open-access multi-user experimental facility to support research on next-generation wireless networks.
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Difference from wired test-bed
Radio channel properties depend on specific wireless node locations and surroundings.
Physical layer bit-rates and error-rates are time-varying.
Shared medium layer-2 protocols on the ra-dio link have a strong impact on network performance.
There are complex interactions between dif-ferent layers
User’s exhibit random mobility and location.
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ORBIT testbed’s goal Scalability Reproducibility Open-access flexibility Extensive measurements capability Remote access
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2-Tier ORBIT system archi-tecture
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ORBIT system architecture
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Hardware components ORBIT radio nodes
1-GHz VIA C3 processor with 512 MB of RAM & 20GB local hard disk
Two wireless mini-PCI 802.11 a/b/g interfaces Integrated chassis manager : remotely moni-
tor the status of each radio node’s hardware. Instrumentation subsystem
Provide capabilities for measurement of ra-dio signal levels & create artificial RF inter-ference.
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Hardware components Independent WLAN monitor system
Provide MAC/network layer view of radio grid’s components
Support severs Front-end servers for web services and
backend server for experimentation and data storage.
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Software components Management/
Control soft-ware.
Software for Radio nodes.
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Management/Control software
Node Handler Disseminate experiment scripts using multi-
cast to the Node Agent. Node Agent
Reports back the state of experiment com-mand execution to the Node Handler.
Disk-Loading Server Enable to quick re-imaging of hard disks on
the nodes as per the requirements of the user.
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Measurement collection software
ORBIT Measurement Library(OML) Filters to be applied to each measured
metric. Collection Server(CS)
Collect the reported measurements
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Lifecycle of an Experiment
The experiment details are translated into a script.
The information is disseminated by Node Handler. The Node Agent executes the script.
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Lifecycle of an Experiment
Performs the experiment which may involves statistics collection done by OML library.
A separate run-time and post-experiment database allows users to quickly view results.
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Sample Experiment Results. Ex.1) To study the effect of 802.11b
interference on the performance of a link under test. Consist of 8 nodes, send UDP packets. 6 interfering nodes, send UDP packets.
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Sample Experiment Results.
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Sample Experiment Results.
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Sample Experiment Results. Ex.2) Effect of varying transmit
power of sender on the performance in the presence of interferers. Demonstrate the effect of changing the
transmit power of sender-receiver link. One sender-receiver pair. 6 interferers.
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Sample Experiment Results.
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Sample Experiment Results. Ex.3) Multi-hop experiment with dual
interface forwarding node(FN) Measure the improvement in network
performance for a multi-hop network with and without using a dual interface forwarding node.
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Sample Experiment Results.
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Conclusion Present the design of a novel radio
grid emulator testbed that facilitate a broad range of experimental re-search on next-generation protocols & applications.
Proof-of-concept validation of the testbed design.