UMD - Unacknowledged Mode Data

In UMTS the UMD PDU (Protocol Data Unit) is used to convey sequentially numbered PDU containing RLC (Radio Link Control) SDU (Service Data Unit) data. It is used by RLC when using unacknowledged data transfer.


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

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