CUSP_GX9004.005

- 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!)