Technology - Mobile 3 - 2G - GSM SIMs, SMS, CAMEL & HSCSD

Synopsis

GSM’s innovative Subscriber Identity Module (SIM) streamlined the widespread deployment of mobile telephony, and plays a central role in GSM’s security. We discuss SIMs, encryption, authentication, GSM standards development, GSM network elements, High Speed Circuit Switched Data (HSCSD) and the CAMEL framework for Intelligent Network applications. We also discuss SMS text messaging.

Table of Contents

• 1. Synopsis
• 2. GSM SIMs
  • 2.1 Encryption and SIMs
    • 2.1.1 SIM - Subscriber Identity Module
    • 2.1.2 Weaknesses in A5/2
  • 2.2 Emissions and safety
  • 2.3 GSM standards development
• 3. GSM, GPRS, EDGE and WCDMA system architecture
  • 3.1 GSM voice only
    • 3.1.1 Interfaces without conventional packet switching
    • 3.1.2 PDH and SDH fibre and microwave links
    • 3.1.3 SS7
    • 3.1.4 Air interface
    • 3.1.5 Home Location Register and Authentication Controller
    • 3.1.6 Extension to packet-switched data
  • 3.2 GERAN
  • 3.3 UTRAN
• 4. SMS Text Messaging
  • 4.1 In-band messaging
  • 4.2 Message length limitations
  • 4.3 Addressing and Interoperability
  • 4.4 spam prevention
  • 4.5 SMS as a basis for other services
• 5. Enhancements to GSM
  • 5.1 CAMEL
  • 5.2 CSD and HSCSD
• 6. Related reports