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3G UMTS Mobile Terminated Call Flow

Get a detailed look at a UMTS mobile terminating call. RANAP and RRC signaling in a terminating call is describe in detail.

3G UMTS Mobile Terminating Call Flow

3G UMTS Terminating Call Sequence Diagram

The RANAP message flow presented here was generated with VisualEther from a PCAP file.  The field level details have been preserved for the RANAP messages. Click on a RANAP messages in the sequence diagram to see full field level details. For example clicking on the Paging message reveals field level detail in the message.

ranap Radio Access Network Application Part

  • per.extension_bit 0… …. Extension Bit: False
  • per.choice_index Choice Index: 0
  • ranap.RANAP_PDU RANAP-PDU: initiatingMessage (0)
    • ranap.initiatingMessage initiatingMessage
      • ranap.procedureCode procedureCode: id-Paging (14)
      • per.enum_index Enumerated Index: 1
      • ranap.criticality criticality: ignore (1)
      • per.open_type_length Open Type Length: 21
      • ranap.value value
        • ranap.Paging Paging
          • per.extension_bit 0… …. Extension Bit: False
          • per.optional_field_bit .0.. …. Optional Field Bit: False (protocolExtensions is NOT present)
          • per.sequence_of_length Sequence-Of Length: 2
          • ranap.protocolIEs protocolIEs: 2 items
            • ranap Item 0: id-CN-DomainIndicator
              • ranap.ProtocolIE_Field ProtocolIE-Field
                • ranap.id id: id-CN-DomainIndicator (3)
                • per.enum_index Enumerated Index: 1
                • ranap.criticality criticality: ignore (1)
                • per.open_type_length Open Type Length: 1
                • ranap.value value
                  • per.enum_index Enumerated Index: 0
                  • ranap.CN_DomainIndicator CN-DomainIndicator: cs-domain (0)
            • ranap Item 1: id-PermanentNAS-UE-ID
              • ranap.ProtocolIE_Field ProtocolIE-Field
                • ranap.id id: id-PermanentNAS-UE-ID (23)
                • per.enum_index Enumerated Index: 1
                • ranap.criticality criticality: ignore (1)
                • per.open_type_length Open Type Length: 9
                • ranap.value value
                  • per.extension_bit 0… …. Extension Bit: False
                  • ranap.PermanentNAS_UE_ID PermanentNAS-UE-ID: iMSI (0)
                    • per.octet_string_length Octet String Length: 8
                    • ranap.iMSI iMSI: 21436587000200f0
                    • ranap.imsi_digits IMSI digits: 123456780020000


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3G UMTS Originating Call Flow

3G UMTS Originating Call Flows

A 3G UMTS originating voice call call setup involves complex signaling to setup and release the call.

  • RRC (Radio Resource Control) signaling between the UE and RAN sets up the radio link.
  • RANAP (Radio Access Network Application Part) signaling sets up the session between the RAN and the Core Network (MSC).

Click on the image to see the full call flow. You can click on most RANAP messages in the call flow to complete field level details of the RANAP messages.

3G UMTS Originating Call with RRC and RANAP signaling

Click here for the 3G UMTS originating voice call flow