SMpSDU - Support Mode for predefined SDU size

The UMTS Iu Interface uses the Iu Protocol, which can be operated in either TrM (Transparent Mode) or SMpSDU (Support Mode for predefined SDU size mode). SMpSDU is intended for those RAB (Radio Access Bearer) that require extra functionality from the Iu user part protocol other than transfer of user data.


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

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