Net-X is a framework being developed by the Wireless Networking Group at UIUC to provide support for exploiting various forms of diversity available in a wireless network in the form of multiple channels, interfaces, transmission rates/power-levels etc.

Several interface capabilities may be available in next generation wireless networks. These include the ability to set the channel of operation and data rate on a frequent basis, and the ability to equip devices with multiple radio interfaces and multiple antennas. It may be possible to significantly improve the performance of wireless networks by exploiting these interface capabilities through carefully designed protocols. However, current operating systems have poor support for implementing protocols that need to use these diverse capabilities. The goal of the Net-X project is to develop generic OS support for utilizing interface capabilities, such that the support is cleanly integrated into the network stack. As a first step in this direction, we have developed an architecture in Linux to support the use of multiple channels, multiple interfaces, and interface switching. The current framework can be easily extended to support other capabilities, and these additional extensions are part of the project's future roadmap.

We have set up a wireless testbed that uses the Net-X framework, and have so far implemented a set of multichannel protocols, that were previously developed in our group.

Visualization Tool

A visualization tool for viewing the testbed nodes in real-time has been developed as part of the Net-X project. The tool enables one to see the nodes along with the channels allocated, the links between the nodes, the quality of the links, and the routes taken by the packets. A snapshot of the visualization tool is shown below:

Downloads

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Some Related Publications

• Net-X: System eXtensions for Supporting Multiple Channels, Multiple Interfaces, and Other Interface Capabilities, Pradeep Kyasanur, Chandrakanth Chereddi, and Nitin H. Vaidya, Technical Report, August 2006
• Design and Implementation of a Multi-Channel Multi-Interface Network, Chandrakanth Chereddi, Pradeep Kyasanur, and Nitin H. Vaidya, REALMAN 2006, May 2006 ( slides )
• Experiments on a Multichannel Multi-Interface Wireless Mesh Network, Thomas Shen and Nitin H. Vaidya, Technical Report, May 2008
• Adjacent Channel Interference Reduction in Multichannel Wireless Networks Using Intelligent Channel Allocation, Vijay Raman and Nitin H. Vaidya, Technical Report, March 2009

Theses

• Pradeep Kyasanur's Ph.D. thesis: Multichannel Wireless Networks: Capacity and Protocols
• Chandrakanth Chereddi's M.S. thesis: System Architecture for Multichannel Multi-Interface Wireless Networks
• Nistha Tripathi's M.S. thesis: Rate Control Framework for Net-X
• Rishi Bhardwaj's M.S. thesis: Lessons From a Multichannel Wireless Mesh Network
• Thomas Shen's M.S. thesis: Experiments on a Multichannel Multi-Interface Wireless Mesh Network
• Vijay Raman's M.S. thesis: Dealing with Adjacent Channel Interference Effects in Multichannel, Multi-Interface Wireless Networks

People

Faculty:

Prof. Nitin H. Vaidya

Post-Doc:

• Cheolgi Kim

Students:

• Vijay Raman (Ph.D.)
• Santosh Vairavan (B.S.)

Former Students:

• Pradeep Kyasanur (Ph.D., graduated in 2006)
• Chandrakanth Chereddi (M.S., graduated in 2006)
• Nistha Tripathi (M.S., graduated in 2007)
• Rishi Bhardwaj (M.S., graduated in 2007)
• Paul Roycroft (B.S., graduated in 2007)
• Charles-Francois Natali (M.S., graduated in 2007)
• Thomas Shen (M.S., graduated in 2008)