Time-variant Community Mobility Model

This is my (Weijen's) back-up webpage for our work on Time-variant community mobility model. The official webpage is available at here.

The Time-Variant Community Mobiliy Model is a model we create to capture two important mobility characteristics we observed earlier from WLAN traces. These two mobility characteristics are skewed location visiting preferences and periodical re-appearance . Our first model, the community model [2], incorporates the skewed location visiting preferences . The latest model, time-variant community model [1], incorporates both mobility characteristics.

While improving the realism of the mobility model, we also keep mathematical tractability as a requirement for the mobility model. We use random-direction mobility model as the basic building block, modify it to incorporate fore-mentioned mobility chracteristics. We are able to derive two quantities of interest related to mobility-assisted routing, the hitting time and the meeting time. We intereted in deriving other quantities in the future.

We make the code for our time-variant community model available here. The code has many parameters and provides full flexibility to match with various mobility scenarios (for full details, refer to the manual below). It simulates the hitting time, the meeting time, and prints the movement traces in two option formats: (1) NS-2 compatible format, or (2) time, location (in x,y coordinates) format.

Supplementary materials for the journal submission

Parameters and descriptions of the simulation HERE
Additional figures for simulation results HERE
Parameter files we use for the matching with various traces HERE (to use these files, you need to "turn on" the option of "using the parameter files". See details in the user manual for the simulation code below.)

Beta-Release of the source code: HERE (latest release on August 4, 2008)

User manual for the code HERE (latest release on May 1, 2007)

Related publications:
[1] Wei-jen Hsu, Thrasyvoulos Spyropoulos, Konstantinos Psounis, and Ahmed Helmy, "Modeling Time-variant User Mobility in Wireless Mobile Networks," INFOCOM 2007, May 2007.
[2] Thrasyvoulos Spyropoulos and Konstantinos Psounis, "Performance Analysis of Mobility-assisted Routing," In Proceedings of ACM MOBIHOC, May 2006.

Acknowledgement:

This work is supported by the National Science Foundation under Grants No. 0724658, 0435505, 0134650, and CNS-0520017