LLPDU - Logical Link Control Protocol Data Unit

In a GPRS system an LL-PDU is a frame comprising of either, user data, SMS message or GPRS Mobility Management information which has been built by the LLC (Logical Link Control) protocol enabling its reliable transfer between the MS (Mobile Station) and SGSN (Serving GPRS Support Node).


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

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