ORBIT Project Overview.

Transcription

1 ORBIT Project Overview

2 ORBIT Overview: Project Rationale Wireless testbeds motivated by: cost & time needed to develop experimental prototypes need for reproducible protocol evaluations large-scale system studies (...emergent behavior) growing importance of cross-layer protocol studies creation of communities for wireless network research ORBIT: open-access multi-user facility for experimental wireless networking research ~24/7 service facility with remote access open interfaces for flexible layer 2,3 & cross-layer protocols extensive measurements at PHY, MAC and Net layers support for wide range of radio system scenarios

3 ORBIT co-pi s WINLAB, Rutgers University Dipankar Raychaudhuri Max Ott Ivan Seskar Wade Trappe Manish Parashar Yanyong Zhang Columbia University Henning Schulzrinne Princeton University Hisashi Kobayashi IBM Research Arup Acharya Lucent Bell Labs Sanjoy Paul Thomson Kumar Ramaswamy

4 Radio Mapping Algorithm Suburban ORBIT Testbed Urban 500 meters Office 20 meters Hallway 300 meters 30 meters 20 meters

5 Formulation of Link SNR Mapping STEP 1 Modeling Link SNR of Real Environments Fidelity of Grid SINR to Link SNR STEP 2 Configuring Grid SINR Prototype network (AP, Ad Hoc, etc.) Spatial distribution of terminals Empirical/Analytical path loss model Setting dedicated noise-like sources Setting locations of grid nodes Setting transmission powers of nodes

6 The Grid: Architecture VPN Gateway to Wide-Area Testbed Gigabit backbone Front-end Servers 80 ft ( 20 nodes ) 70 ft m ( 20 nodes ) Data switch Application Servers (User applications/ Delay nodes/ Mobility Controllers / Mobile Nodes) Control switch SA 1 SA 2 SA P IS 1 IS 2 IS Q Back-end servers RF/Spectrum Measurements Interference Sources Internet VPN Gateway / Firewall

7 The Grid: Hardware Atheros Bluetooth minipci USB a/b/g Atheros minipci a/b/g 1 Ghz 512 MB RAM CPU VIA C3 1Ghz (control) Gigabit 20 GB DISK 110 VAC Gigabit Ethernet Ethernet Serial Console Power Supply +5v standby pwr/reset volt/temp 22.1Mhz CPU Rabbit Semi RCM3700 (data) 10 BaseT Ethernet (CM) RJ11 NodeIdBox

8 RF Interference grid Number of transmitter antennas providing spatial distribution of interference sources (BW = 40 MHz, f0=250 KHz 6 GHz) each antenna linear combination of 2-8 sources (cost issue) Variety of interference types (W-CDMA, cdma2000, 1xEV- DO/DV, TD-SCDMA, cdmaone, GSM/EDGE, GPRS/EGPRS, Bluetooth, GPS, enhanced multitone, NPR, AWGN, or up to 8 sec of arbitrary waveform generation) Agilent ESG Agilent ESG Agilent ESG +

9 Experiment Support Architecture Deploy & Configure Control Measure System Definition Results Experimenter

10 Defining an Experiment Properties App 1 Test code Measurements Sys Topology Application Prototype Mapping Strategy P1 Pi - Mapping nodes to prototype - Binding free properties Dynamic Static Experiment

11 OML: Measurement Framework

12 Experiment Definition Experiment.name = "tutorial-1" Experiment.project = "Orbit::Tutorial" Experiment.startMode = Experiment::REBOOT # # Define nodes used in experiment # node([2, 3], :sender) { n n.prototype(" { :if => Node::W0_IF, :packetsize => Experiment.parameter("packetSize"), :rate => Experiment.parameter("rate") }) } node([3, 4]) { n n.prototype(" {:if => Node::W0_IF}) } # # Configure environment # node("/*/*").net.w0 { n n.essid = "HelloWorld" n.mode = "ad-hoc" n.channel = 1 n.xmitpower = 1 ;# What is 1? n.bitrate = "11Mbps" # Force single rate n.ip = "%10.0.%x.%y" } # Start experiment whenready { e, n p.packetsize = 1024 p.rate = 250 e.sleep 5.0 e.done }

13 Prototype Definition <prototype id=' p = Prototype.create(" <name>sender</name> p.name = "Sender" <url> p.description = <description>nodes "Nodes which send which a stream send a stream of packets" of packets</description> <parameters> p.addparameter(:if, "Name of interface to use", Node::W0_IF) <parameter name='packetsize' id='packetsize'> p.addparameter(:packetsize, <description>payload "Payload length length of outgoing of outgoing packets</description> packets", 1000) p.addparameter(:rate, <default>1000</default> "Rate to send", 1000) p.addparameter(:channel, </parameter> "Channel to send on", 1) p.addparameter(:usesocket, "If true use socket, otherwise use libmac for transport", true) </parameters> <applications> genny = p.addapplication(:gennysender, " <application refid=' genny.bindproperty(:interface_name, <properties> :if) genny.bindproperty(:rate) <property idref='interface_name'><binding idref='if'/></property> genny.bindproperty(:payload_length, :packetsize) genny.bindproperty(:use_socket, </properties> :usesocket) <measurements> <measurement id='group3'> genny.addmeasurement(:group3, Filter::SAMPLE, <properties> {Filter::SAMPLE_SIZE <property => idref='uri:oml:filter:trigger'> 100}, [ ["offered_load", </properties> Filter::MEAN] ] <metric refid='offered_load'> ) <filter idref='uri:oml:filter:mean'/>

14 Analyzing Experiments function nsf(dbserver, dbuser, dbpw, database); % Part where we retrieve data from the database; mysql('open',dbserver, dbuser, dbpw); mysql('use', database); output = struct('time',[],'thr_all',[],'node',[]); [output.time, output.thr_all, output.node] = mysql('select timestamp, throughput, node_id from group2'); [thru1_4, time1_4, thru3_1, time3_1] = sort_mysql(output); % Finally, the plotting part subplot(2,1,1); plot(time1_4, thru1_4, '-*'); title('throughput On Obstructed Link'); xlabel('time (sec)'); ylabel('throuhput (bps)'); grid on; subplot(2,1,2); plot(time3_1, thru3_1, '-*'); title('throughput On Monitor Node'); xlabel('time (sec)'); ylabel('throuhput (bps)'); grid on;

15 Progress Installed Production Nodes Scaled to 64 Nodes Added Bluetooth Semi-automated calibration (+/- 10db) Web site is up Supporting Click Started with external experimenter (Columbia) Started exploring mobility & NS-2 integration V2 of node handler & OML in beta 5 Papers accepted

16 Future Delivery of 450 nodes in December Extend Beta testers to industry EWPs Move into new building (???) Explore new radios (Zigbee, Mote, GNU radio) Scale to 400 Interested? Join mailing list

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18 Testbed System ORBIT consists of radio grid emulator + field trial network Emulator used for detailed protocol evaluations in reproducible complex radio environments Field trial network for further real-world evaluation & application trials