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  2. Network switching subsystem - Wikipedia

    en.wikipedia.org/wiki/Network_switching_subsystem

    Network switching subsystem (NSS) (or GSM core network) is the component of a GSM system that carries out call out and mobility management functions for mobile phones roaming on the network of base stations.

  3. Mobility management - Wikipedia

    en.wikipedia.org/wiki/Mobility_management

    Therefore, it is important to strike a balance between the size of the location area and the number of mobile device users in the location area [citation needed]. Routing area. The routing area is the packet-switched domain equivalent of the location area. A "routing area" is normally a subdivision of a "location area".

  4. GSM - Wikipedia

    en.wikipedia.org/wiki/GSM

    GSM networks operate in a number of different carrier frequency ranges (separated into GSM frequency ranges for 2G and UMTS frequency bands for 3G), with most 2G GSM networks operating in the 900 MHz or 1800 MHz bands. Where these bands were already allocated, the 850 MHz and 1900 MHz bands were used instead (for example in Canada and the ...

  5. UMTS - Wikipedia

    en.wikipedia.org/wiki/W-CDMA

    The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Telecommunication Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology.