Wireless Testbed in Tsinghua Univ ersity Fenghua Li Network Research Center of Tsinghua University AsianFI 2008
Mar 27, 2015
Wireless Testbed in Tsinghua University
Fenghua LiNetwork Research Center ofTsinghua UniversityAsianFI 2008
Outlines
Inside Thinking Wireless Testbed in Tsinghua University
Inside Thinking
Why we focus on wireless technology? What the future Internet looks like? What’s the key points of future Internet?
Why we focus on wireless technology?
One of the most important characters of Future Internet (Freedom!~)Access Internet anywhereNo cable limitation…
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
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?
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?
What the future Internet looks like?
We still can conclude the architecture of future wireless internet as three parts InfrastructureMiddlewareApplications
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.
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
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
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
What we try to build is…
Large-scale IPv6 Heterogeneous Wireless Network TestbedMulti-Radio Mobile TerminalsMulti-Structure Access NetworkDistributed Mobile MiddlewareMulti-Applications
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
Tsinghua University
15
Tianjin University
Zhejiang University
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
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.
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
Rat Year: Hope you could run faster!!
Thank you for your listening!