- Mohit Sharma
Identifying social patterns from the cellular data
©2015-2016 NYU CUSP
http://slides.com/mohitsharma44/cusp_gx9004-005/live
Cellular Communication
- Every full duplex communication uses two separate frequencies
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
- The Global System for Mobile Communications (GSM) is a second generation (2G) standard for mobile networks.
- GSM in the United States uses 2 different bands
- GSM 850
- Uplink: 824.0 - 849.0 MHz
- Downlink: 869.0 - 894.0 MHz
- GSM 1900
- Uplink: 1850.2 – 1909.8 MHz
- Downlink: 1930.2 – 1989.8 MHz
GSM Communication
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
- Radio transceiver whose system components such a filters, mixers etc. have been implemented in software.
SDR
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
Working of GSM
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
Working of GSM
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
What Towers broadcast
- Location Area Identifier (LAI)
- Location Update Requests (LUR)
- Location Update Accepts (LUA)
- Paging Requests
- International Mobile Subscriber Identity (IMSI)
- Temporary Mobile Subscriber Identity (TMSI)
.....
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
Location Area Identifier (LAI)
- Cell Identity (CI)
- Mobile Country Code (MCC)
- Mobile Network Code (MNC)
- Location Area Code (LAC)
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
IMSI and TMSI
- IMSI (International Mobile Subscriber Identity) is broadcasted when the cellphone first enters an area.
- It is associated with the SIM card.
- TMSI (Temporary Mobile Subscriber Identity) is broadcasted when the cellphone performs any activity in that area.
- It is associated with the SIM in that AREA
MCC
MNC
ID
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
ssh cuspid@gw.cusp.nyu.edu -L 9000:wingrdp.cusp.nyu.edu:3389
Hands On..
mohit sharma (mohit.sharma@nyu.edu)
©2015-2016 NYU CUSP
MAC
Microsoft Remote Desktop
Ubuntu
Remmina Remote Desktop Client
Windows: https://datahub.cusp.nyu.edu/documents/guides/Green_Environment_Basics_Windows.pdf (Good Luck!)