Mobile Computing | DAVV Unit 5

Mobile Telecommunication System Overview:

Mobile telecom systems enable wireless communication over a cell network. They allow voice calls, messaging, and data transmission, playing a crucial role in modern communication.

Global System for Mobile Communication (GSM):

  • GSM is a widely used second-generation (2G) mobile communication standard.
  • Developed in the 1980s, it provided digital voice communication, allowing better quality and efficient spectrum usage.
  • Key features:
    • Time Division Multiple Access (TDMA) technology divides a frequency into time slots for multiple users.
    • SIM (Subscriber Identity Module) cards enable users to switch devices while keeping their identity and data.
    • Supports voice and text messaging services.
  • GSM formed the foundation for newer mobile technologies and laid the groundwork for mobile data services.

General Packet Radio Service (GPRS):

  • GPRS is an enhancement of GSM, providing packet-switched data services over existing GSM networks.
  • It marked the transition from circuit-switched to packet-switched data, allowing more efficient data transmission.
  • Key features:
    • Packet-based data transfer, allowing always-on connectivity for email, internet browsing, and other data applications.
    • Differentiates between voice and data usage, making data services more affordable.
    • GPRS paved the way for mobile data services like MMS (Multimedia Messaging Service) and early internet access on mobile devices.

Universal Mobile Telecommunication System (UMTS):

  • UMTS, also known as 3G, is a third-generation mobile communication technology that provided significant enhancements over GSM/GPRS.
  • UMTS introduced higher data rates, multimedia support, and improved voice quality.
  • Key features:
    • Uses Wideband Code Division Multiple Access (WCDMA) technology for higher data rates and increased capacity.
    • Enables faster internet access, video streaming, and improved multimedia experiences.
    • Supports simultaneous voice and data transmission.
    • UMTS opened the door for mobile apps, video calls, and advanced data services.