Wireless Testbed in Tsinghua University Fenghua Li Network Research Center of Tsinghua University...
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Transcript of Wireless Testbed in Tsinghua University Fenghua Li Network Research Center of Tsinghua University...
![Page 1: Wireless Testbed in Tsinghua University Fenghua Li Network Research Center of Tsinghua University AsianFI 2008.](https://reader033.fdocuments.in/reader033/viewer/2022061306/551492d1550346ea6e8b52b0/html5/thumbnails/1.jpg)
Wireless Testbed in Tsinghua University
Fenghua LiNetwork Research Center ofTsinghua UniversityAsianFI 2008
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Outlines
Inside Thinking Wireless Testbed in Tsinghua University
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Inside Thinking
Why we focus on wireless technology? What the future Internet looks like? What’s the key points of future Internet?
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Why we focus on wireless technology?
One of the most important characters of Future Internet (Freedom!~)Access Internet anywhereNo cable limitation…
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Why we focus on wireless technology? Technique side
New Applications, Services, Requirements
Transport LayerNetwork Layer
Link Layer
New Wireless Communications Technology
Top
Down
Up
Bottom
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Technique Side
Top-Down driven: User DemandNew applications
MMS, P2P image/video sharing, IPTV streaming, …
New requirements Security, privacy, robustness/dependability,
managementNew services
Location-based service, Personalized service, …
Challenge: How to support such new demands?
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Technique Side
Bottom-Up Driven: New technology Sector Antenna, antenna arrays, Smart antennas Adaptive modulation, OFDM Spectrum sharing, cognitive radio, channel managem
ent Multi-interface radios, device heterogeneity …
Challenge: How to exploit these new PHY communication capabilities in the protocols?
![Page 8: Wireless Testbed in Tsinghua University Fenghua Li Network Research Center of Tsinghua University AsianFI 2008.](https://reader033.fdocuments.in/reader033/viewer/2022061306/551492d1550346ea6e8b52b0/html5/thumbnails/8.jpg)
What the future Internet looks like?
We still can conclude the architecture of future wireless internet as three parts InfrastructureMiddlewareApplications
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Which Technique will win?
Some people think:Wifi/Wimax would kill 3G Do you believe rat could eat elephant? Although r
at is not easy to be killed by elephant. In fact, different wireless access technology h
as different nature(just like different wine), they could not instead of each other but co-exist in next 5 or 10 years. The game is not one win but all win.
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Future Internet maybe …
Coexistence of Heterogeneous Wireless Networking Tech.
•Wireless LAN: 802.11b/a/g/n•Cellular networks: 2G, 3G and beyond•Mesh networks, Vehicle networks, sensors…
Mesh/Vehicle/Sensor
Network
InternetWireless
LANs
Access Point Cellular Network
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What’s the key points of future Internet? Architecture: mobility management
Identifier Locator Separated Cross-layer
Killer Applications? Value-added Services Multi-homing and Heterogeneous
Others Security QoS Scalability
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Wireless Testbed in THU
Why We need a testbed? Modeling problem
User behavior Wireless transmit model
Simulation problem Any result you want
Network research is more like traditional physics experiment: Only trust the result from real experiments
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What we try to build is…
Large-scale IPv6 Heterogeneous Wireless Network TestbedMulti-Radio Mobile TerminalsMulti-Structure Access NetworkDistributed Mobile MiddlewareMulti-Applications
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What we have done is …
14
Beijing Tsinghua University
TianjinTianjin University
LanzhouLanzhou University
WuhanHuazhong University of S&T
HangzhouZhejiang University
GuangzhouSouth China University of Technology802.11 a/b/g, 802.16d;
200+ indoor, 20+ Mesh outdoorCampus WLAN support both IPv4 and native IPv6
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Tsinghua University
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Tianjin University
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Zhejiang University
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Applications
SIP6: Personal Real Time Communication SystemDeployed on CERNET2, Pure IPv6 SolutionDeveloping SIP client and server Software ba
sed on Open sourceSupport Voice, Video, IM, Presence, PSTN C
all
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Services
IPv6 PSTN Call Peered with commercial VoIP Provider
Living Broadcast Nobel Prize Holders’ Presentation Source: Chinese University of Hong Kong(CUHK) Receiver: 6 Universities Students. Scale: Over 1,500 concurrent users.
Exploration of SIP controlled P2P Streaming.
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Conclusion
Future Internet inside thinking All kinds of technology co-exist Need new protocols solve problems
Identifier is much important Problem should be solved one by one, but we should
treat them as a part of whole system Tsinghua Wireless Testbed
Large-scale IPv6 Heterogeneous Wireless Network Testbed
IPv6 Applications and services
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Rat Year: Hope you could run faster!!
Thank you for your listening!