TLLI - Temporary Logical Link Identifier

The Temporary Logical Link Identifier provides a signalling address for communication between the MS (Mobile Station) and the SGSN (Serving GPRS Support Node). Three main types of TLLI exist: Local TLLI – used under normal operation between the mobile and the serving SGSN; Foreign TLLI – may be used when crossing a RA (Routing Area) boundary; Random TLLI – used for initial access or when the mobile does not possess one of the above.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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