Wireless Testbed in Tsinghua University Fenghua Li Network Research Center of Tsinghua University AsianFI 2008.

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!