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

Outlines Inside Thinking Wireless Testbed in Tsinghua University

Inside Thinking Why we focus on wireless technology? What the future Internet looks like? Whats the key points of future Internet?

Why we focus on wireless technology? One of the most important characters of Future Internet (Freedom!~) Access Internet anywhere No cable limitation …

Why we focus on wireless technology? Technique side New Applications, Services, Requirements Transport Layer Network Layer Link Layer New Wireless Communications Technology Top Down Up Bottom

Technique Side Top-Down driven: User Demand New applications MMS, P2P image/video sharing, IPTV streaming, … New requirements Security, privacy, robustness/dependability, management New 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 management 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 Infrastructure Middleware Applications

Which Technique will win? Some people think:Wifi/Wimax would kill 3G Do you believe rat could eat elephant? Although rat is not easy to be killed by elephant. In fact, different wireless access technology has 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: b/a/g/n Cellular networks: 2G, 3G and beyond Mesh networks, Vehicle networks, sensors… Mesh/Vehicle/ Sensor Network Internet Wireless LANs Access Point Cellular Network

Whats 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 Testbed Multi-Radio Mobile Terminals Multi-Structure Access Network Distributed Mobile Middleware Multi-Applications

What we have done is … 14 Beijing Tsinghua University Tianjin Tianjin University Lanzhou Lanzhou University Wuhan Huazhong University of S&T Hangzhou Zhejiang University Guangzhou South China University of Technology a/b/g, d; 200+ indoor, 20+ Mesh outdoor Campus WLAN support both IPv4 and native IPv6

Tsinghua University 15

Tianjin University

Zhejiang University

Applications SIP6: Personal Real Time Communication System Deployed on CERNET2, Pure IPv6 Solution Developing SIP client and server Software based on Open source Support Voice, Video, IM, Presence, PSTN Call

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!