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Mobile Services and Data Services in GSM

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Mobile Services in GSM

GSM offers three main types of mobile services:

a) Teleservices

  • Standard voice call services for person-to-person communication.

  • Emergency call support (e.g., 112, 911).

  • Short Message Service (SMS) for sending and receiving text messages.

  • Voice mail services for storing and retrieving voice messages.

b) Bearer Services

  • Facilitate data transmission between devices over the GSM network.

  • Support data rates ranging from 300 bps up to 9.6 kbps.

  • Enable applications like Internet access and fax transmission.

c) Supplementary Services

  • Call-related features such as call waiting, call hold, call forwarding, and call barring.

  • Security features including caller ID and PIN authentication.

  • Multiparty call support, allowing conference calls among multiple users.

Data Services in GSM

GSM supports several data services to facilitate communication and Internet access:

a) Circuit-Switched Data (CSD)

  • Uses a dedicated circuit channel for the duration of the data session.

  • Supports data rates up to 9.6 kbps.

b) High-Speed Circuit-Switched Data (HSCSD)

  • Enhanced version of CSD offering higher data rates by combining multiple time slots.

  • Provides speeds up to 57.6 kbps.

  • Suitable for applications requiring better quality, such as video calls and web browsing.

c) General Packet Radio Service (GPRS)

  • Packet-switched data transmission, allowing efficient use of network resources.

  • Supports data speeds between 56 kbps and 114 kbps.

  • Enables always-on connectivity, suitable for mobile Internet, email, and multimedia messaging.

d) Enhanced Data Rates for GSM Evolution (EDGE)

  • An improved version of GPRS offering higher data rates through advanced modulation techniques.

  • Supports speeds up to 384 kbps.

  • Enables faster web browsing, video streaming, and file downloads on mobile devices.

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