D.4.2.5.3 Association Initiation Policy
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##### D.4.2.5.3 Association Initiation Policy

MOVE-SCU attempts to initiate a new association when the user performs the retrieve action from the user interface.

###### D.4.2.5.3.1 Activity - Retrieve From Remote AE

###### D.4.2.5.3.1.1 Description and Sequencing of Activities

For the entity (study, series or instance) selected from the user interface to be retrieved, a single attempt will be made to retrieve it from the selected remote AE. If the retrieve fails, for whatever reason, no retry will be performed.

###### D.4.2.5.3.1.2 Proposed Presentation Contexts

Table D.4.2-29. Proposed Presentation Contexts for MOVE-SCU and Retrieve From Remote AE

Presentation Context Table
Abstract Syntax | Transfer Syntax | Role | Extended Negotiation
--- | --- | --- | ---
Name | UID | Name List | UID List
See Table D.4.2-25 | See Table D.4.2-25 | Implicit VR Little Endian | 1.2.840.10008.1.2 | SCP | None
Explicit VR Little Endian | 1.2.840.10008.1.2.1
Explicit VR Big Endian | 1.2.840.10008.1.2.2

MOVE-SCU will propose multiple Presentation Contexts, one for each of the supported Transfer Syntaxes, and an additional Presentation Context with all of the supported Transfer Syntaxes, in order to determine which Transfer Syntaxes the remote SCP supports, and which it prefers.

###### D.4.2.5.3.1.2.1 Extended Negotiation

No extended negotiation is performed.

In particular, relational retrievals are not supported.

###### D.4.2.5.3.1.3 SOP Specific Conformance

###### D.4.2.5.3.1.3.1 SOP Specific Conformance to C-FIND SOP Classes

MOVE-SCU provides standard conformance to the supported C-MOVE SOP Classes.

Only a single information model, Study Root, is supported.

A retrieval will be performed at the STUDY, SERIES or IMAGE level depending on what level of entity has been selected by the user in the browser.

No CANCEL requests are ever issued.

The retrieval is performed from the AE that was specified in the Retrieve AE attribute returned from the query performed by FIND-SCU. The instances are retrieved to the current application's local database by specifying the destination as the AE Title of the STORE-SCP AE of the local application. This implies that the remote C-MOVE SCP must be preconfigured to determine the presentation address corresponding to the STORE-SCP AE. The STORE-SCP AE will accept storage requests addressed to it from anywhere, so no pre-configuration of the local application to accept from the remote AE is necessary (except in so far as it was necessary to configure FIND-SCU).

Table D.4.2-30. Study Root Request Identifier for MOVE-SCU

Name | Tag | Unique, Matching or Return Key
--- | --- | ---
STUDY level
Study Instance UID | (0020,000D) | U
SERIES level
Series Instance UID | (0020,000E) | U
IMAGE level
SOP Instance UID | (0008,0018) | U

###### D.4.2.5.3.1.3.2 Presentation Context Acceptance Criterion

MOVE-SCU does not accept associations.

###### D.4.2.5.3.1.3.3 Transfer Syntax Selection Policies

MOVE-SCU prefers explicit Transfer Syntaxes. If offered a choice of Transfer Syntaxes in the accepted Presentation Contexts, it will apply the following priority to the choice of Presentation Context to use for the C-STORE operation:

1. first encountered explicit Transfer Syntax,

###### D.4.2.5.3.1.3.4 Response Status

MOVE-SCU will behave as described in the Table below in response to the status returned in the C-MOVE response command message(s).

Table D.4.2-31. Response Status for MOVE-SCU and Retrieve From Remote AE Request

Service Status | Further Meaning | Status Codes | Related Fields | Behavior
--- | --- | --- | --- | ---
Refused | Out of Resources - Unable to calculate number of matches | A701 | (0000,0902) | Retrieval is terminated
| Out of Resources - Unable to perform sub-operations | A702 | (0000,1020) (0000,1021) (0000,1022) (0000,1023) | Retrieval is terminated
| Move Destination unknown | A801 | (0000,0902) | Retrieval is terminated
Failed | Identifier does not match SOP Class | A900 | (0000,0901) (0000,0902) | Retrieval is terminated
| Unable to process | Cxxx | (0000,0901) (0000,0902) | Retrieval is terminated
Cancel | Sub-operations terminated due to Cancel Indication | FE00 | (0000,1020) (0000,1021) (0000,1022) (0000,1023) | Retrieval is terminated (should never occur, since cancels never issued)
Warning | Sub-operations Complete - One or more Failures | B000 | (0000,1020) (0000,1022) (0000,1023) | Retrieval is terminated
Success | Sub-operations Complete - No Failures | 0000 | (0000,1020) (0000,1021) (0000,1022) (0000,1023) | Retrieval is terminated
Pending | Sub-operations are continuing | FF00 | (0000,1020) (0000,1021) (0000,1022) (0000,1023) | Retrieval continues

###### D.4.2.5.3.1.3.5 Sub-Operation Dependent Behavior

Since the C-MOVE operation is dependent on completion of C-STORE sub-operations that are occurring on a separate association, the question of failure of operations on the other association(s) must be considered.

MOVE-SCU completely ignores whatever activities are taking place in relation to the STORAGE-SCP AE that is receiving the retrieved instances. Once the C-MOVE has been initiated it runs to completion (or failure) as described in the C-MOVE response command message(s). There is no attempt by MOVE-SCU to confirm that instances have actually been successfully received or locally stored.

Whether or not completely or partially successfully retrievals are made available in the local database to the user is purely dependent on the success or failure of the C-STORE sub-operations, not on any explicit action by MOVE-SCU.

Whether or not the remote AE attempts to retry any failed C-STORE sub-operations is beyond the control of MOVE-SCU.

If the association on which the C-MOVE was issued is aborted for any reason, whether or not the C-STORE sub-operations continue is dependent on the remote AE; the local STORAGE-SCP will continue to accept associations and storage operations regardless.

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