Mobility support, Mobile IP and Wireless Channel Support for ns-2

• A mobility scenario generation subsystem
• A simplified wireless channel model
• An implementation of Mobile IP (RFC 2002)

The mobility generator simulates node movements and provides the channel model with link up/down information based on the time-dependent distance between nodes. The wireless channel model handles two physical phenomena:

• Hidden terminal interference
• Signal capture when there is no interference from hidden terminals

Our Mobile IP implementation contains the following features:

• Agent advertisement
• Registration
• IP-in-IP encapsulation
• No security checks; all registrations are accepted
• No de-registrations; any registration pre-empts earlier ones
• No agent solicitation

This mobility support package is intended to be very simple to use. Our motivations were to support simulation and comparison between various ad-hoc networking algorithms, as well as Mobile IP simulation.

Included in the release are two slide presentations that exhibit some further discussion of the features available, and code fragments to illustrate the use of the features.

We understand that there is related work in progress at CMU, which contains many other useful features, and more realistic channel models. We hope to integrate our release code with their channel models, and possibly use other features as they become available.

We expect to make improvements to this release in the near future. In particular, we expect to release more features for the Mobile IP simulation, and additional improvements in the way NS-2 handles the wireless channel internally. Bug fixes are welcome, and can be sent to <cperkins@eng.sun.com>.

Downloading

Download the source code

Slide Presentations

• Mobility generator and Mobile IP
• Wireless Channel model