March 3, 2008
Speaker: Dr. Li (Erran) Li, Bell Labs
We present muNet, a wireless mesh network design to harness the multiuser capacity of wireless channels. Traditionally, media access control is designed to schedule one transmission between one sender and one receiver without interference at any given time. However, this design is suboptimal in terms of achieving the multiuser capacity of multi-access wireless channels. Instead, muNet utilizes well-known physical layer techniques called superposition coding and successive interference cancellation to enable simultaneous unicast transmissions from a single transmitter to multiple receivers as well as from multiple transmitters to a single receiver. muNet includes the first practical MAC protocol that leverages such a physical layer and exposes the multiuser capacity to upper layers. It also includes a simple routing protocol that increases simultaneous transmission opportunities for the MAC layer. A proof-of-concept muNet is implemented on the GNU Radio platform. Measurements on the implementation shows that the throughput gains of muNet are significant (up to 93%). We also supplement our experimental results with extensive simulations. Our simulations show that muNet can increase the throughput of large, dense wireless mesh networks by up to 176%.
Li (Erran) Li received a B.E. in Automatic Control from Beijing Polytechnic University in 1993, a M.E. in Pattern Recognition from the Institute of Automation, Chinese Academy of Sciences, in 1996, and a Ph.D. in Computer Science from Cornell University in 2001 where Joseph Y. Halpern was his advisor. Since graduation, he has been with the Networking Research Center in Bell Labs. His research interests are in networking with a focus on wireless networking and mobile computing. He has served as a program committee member for several conferences including ACM MobiCom, ACM MobiHoc, IEEE INFOCOM and IEEE ICNP. He is an editor of WINET, and a guest editor for JSAC spe cial issue on Non-Cooperative Behavior in Networking. He has published over 30 papers.