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10.3.5.3 N-CREATE Protocol Procedures (Current)
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#### 10.3.5.3 N-CREATE Protocol Procedures

The N-CREATE procedures are initiated by the invoking DIMSE Service User issuing an N-CREATE request primitive. On receipt of the N-CREATE request primitive the DIMSE-N protocol machine shall:

- construct a Message conveying the N-CREATE-RQ

- send the Message using the P-DATA request service (see 8.1)

On receipt of a Message conveying an N-CREATE-RQ the DIMSE-N protocol machine shall issue an N-CREATE indication primitive to the performing DIMSE Service User.

On receipt of the N-CREATE response primitive, issued by the performing DIMSE Service User, the DIMSE-N protocol machine shall:

- construct a Message conveying the N-CREATE-RSP

- send the Message using the P-DATA request service (see 8.1)

On receipt of a Message conveying an N-CREATE-RSP the DIMSE-N protocol machine shall issue an N-CREATE confirmation primitive to the invoking DIMSE Service User, thus completing the N-CREATE procedure.

The performing DIMSE Service User may return an N-CREATE-RSP with the status of Failed or Refused before the complete N-CREATE-RQ request Message has been completely transmitted by the invoking DIMSE Service User (this is called an early failed response). Upon receipt of this Failed or Refused N-CREATE-RSP the invoking DIMSE Service User may terminate the Message before it is completely sent (i.e., set the Last Fragment bit to 1 in a Data PDV for this Message, see Annex F). Following this, it may invoke another operation or notification. It is a protocol violation for an invoking DIMSE Service User to set the Last Fragment bit to 1 before an N-CREATE-RQ Message has been completely transmitted if it has not received a Failed or Refused N-CREATE-RSP to that request.

### Note

When an Association is operating in asynchronous mode, it is possible for an invoking DIMSE Service User to transmit several Messages before a response. Therefore, while sending a Message it may receive a response to a previously transmitted Message. In this case this response is not an early failed response because the related Message has already been sent.

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DICOM PS3.7 2021d - Message Exchange