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10.3.3.3 N-SET Protocol Procedures
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#### 10.3.3.3 N-SET Protocol Procedures

The N-SET procedures are initiated by the invoking DIMSE-service-user issuing an N-SET request primitive. On receipt of the N-SET request primitive the DIMSE-N protocol machine shall:

- construct a Message conveying the N-SET-RQ

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

On receipt of a Message conveying an N-SET-RQ the DIMSE-N protocol machine shall issue an N-SET indication primitive to the performing DIMSE-service-user.

On receipt of the N-SET response primitive, issued by the performing DIMSE-service-user, the DIMSE-N protocol machine shall:

- construct a Message conveying the N-SET-RSP

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

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

The performing DIMSE-service-user may return an N-SET-RSP with the status of Failed or Refused before the complete N-SET-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-SET-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-SET-RQ Message has been completely transmitted if it has not received a Failed or Refused N-SET-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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