9.2 DICOM Upper Layer Protocol for TCP/IP State Machine

9.2 DICOM Upper Layer Protocol for TCP/IP State Machine
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9.2.1 Machine States Definition

Table 9-1. No Association

State	Definition
Sta 1	Idle

Table 9-2. Association Establishment

State	Definition
Sta 2	Transport connection open (Awaiting A-ASSOCIATE-RQ PDU)
Sta 3	Awaiting local A-ASSOCIATE response primitive (from local user)
Sta 4	Awaiting transport connection opening to complete (from local transport service)
Sta 5	Awaiting A-ASSOCIATE-AC or A-ASSOCIATE-RJ PDU

Table 9-3. Data Transfer

State	Definition
Sta 6	Association established and ready for data transfer

Table 9-4. Association Release

State	Definition
Sta 7	Awaiting A-RELEASE-RP PDU
Sta 8	Awaiting local A-RELEASE response primitive (from local user)
Sta 9	Release collision requestor side; awaiting A-RELEASE response (from local user)
Sta 10	Release collision acceptor side; awaiting A-RELEASE-RP PDU
Sta 11	Release collision requestor side; awaiting A-RELEASE-RP PDU
Sta 12	Release collision acceptor side; awaiting A-RELEASE response primitive (from local user)

Table 9-5. Waiting for Transport Connection Close

State	Definition
Sta 13	Awaiting Transport Connection Close Indication (Association no longer exists)

9.2.2 State Machine Actions Definition

Table 9-6. Association Establishment Related Actions

Action	Definition
AE-1	Issue TRANSPORT CONNECT request primitive to local transport serviceNext state is Sta4
AE-2	Send A-ASSOCIATE-RQ-PDUNext state is Sta5
AE-3	Issue A-ASSOCIATE confirmation (accept) primitiveNext state is Sta6
AE-4	Issue A-ASSOCIATE confirmation (reject) primitive and close transport connectionNext state is Sta1
AE-5	Issue Transport connection response primitive; start ARTIM timerNext state is Sta2
AE-6	Stop ARTIM timer and if A-ASSOCIATE-RQ acceptable by service-provider:- issue A-ASSOCIATE indication primitiveNext state is Sta3 otherwise:-issue A-ASSOCIATE-RJ-PDU and start ARTIM timerNext state is Sta13
AE-7	Send A-ASSOCIATE-AC PDUNext state is Sta6
AE-8	Send A-ASSOCIATE-RJ PDU and start ARTIM timerNext state is STA13

Table 9-7. Data Transfer Related Actions

State	Definition
DT-1	Send P-DATA-TF PDUNext state is Sta6
DT-2	Send P-DATA indication primitiveNext state is Sta6

Table 9-8. Association Release Related Actions

Action	Definition
AR-1	Send A-RELEASE-RQ PDUNext state is Sta7
AR-2	Issue A-RELEASE indication primitiveNext state is Sta8
AR-3	Issue A-RELEASE confirmation primitive, and close transport connectionNext state is Sta1
AR-4	Issue A-RELEASE-RP PDU and start ARTIM timerNext state is Sta13
AR-5	Stop ARTIM timerNext state is Sta1
AR-6	Issue P-DATA indicationNext state is Sta7
AR-7	Issue P-DATA-TF PDUNext state is Sta8
AR-8	Issue A-RELEASE indication (release collision) :- if association-requestor, next state is Sta9- if not, next state is Sta10
AR-9	Send A-RELEASE-RP PDUNext state is Sta11
AR-10	Issue A-RELEASE confirmation primitiveNext state is Sta12

Table 9-9. Association Abort Related Actions

Action	Definition
AA-1	Send A-ABORT PDU (service-user source) and start (or restart if already started) ARTIM timer;Next state is Sta13
AA-2	Stop ARTIM timer if running. Close transport connectionNext state is Sta1
AA-3	If (service-user inititated abort)- issue A-ABORT indication and close transport connectionotherwise (service-provider inititated abort) :- issue A-P-ABORT indication and close transport connectionNext state is Sta1
AA-4	Issue A-P-ABORT indication primitive, Next state is Sta1
AA-5	Stop ARTIM timer, Next state is Sta1
AA-6	Ignore PDU, Next state is Sta13
AA-7	Send A-ABORT PDU, Next state is Sta13
AA-8	Send A-ABORT PDU (service-provider source-), issue an A-P-ABORT indication, and start ARTIM timer;Nest state is Sta13

9.2.3 DICOM Upper Layer Protocol for TCP/IP State Transition Table

The DICOM Upper Layer Protocol State transitions are specified in Table 9-10. This table addresses both the normal and error cases for the protocol operation. Both the called and the calling aspects of an association are described in this table.

Table 9-10. DICOM Upper Layer Protocol State Transition Table

STATES	No assocⁿ	Association establishment				Data transfer	Association release (normal & collision)						Wait for Tp Close
EVENTS	Sta1	Sta2	Sta3	Sta4	Sta5	Sta6	Sta7	Sta8	Sta9	Sta10	Sta11	Sta12	Sta13
A-ASSOCIATE Request (local user)	AE-1 Sta4
Transport Conn. Confirmⁿ (local transport service)				AE-2 Sta5
A-ASSOCIATE-AC PDU (received on transport connection)		AA-1 Sta13	AA-8 Sta13		AE-3 Sta6	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-6 Sta13
A-ASSOCIATE-RJ PDU (received on transport connection)		AA-1 Sta13	AA-8 Sta13		AE-4 Sta1	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-6 Sta13
Transport Connection Indication (local transport service)	AE-5 Sta2
A-ASSOCIATE-RQ PDU (received on transport connection)		AE-6 Sta3 or 13	AA-8 Sta13		AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-7 Sta13
A-ASSOCIATE response primitive (accept)			AE-7 Sta6
A-ASSOCIATE response primitive (reject)			AE-8 Sta13
P-DATA request primitive						DT-1 Sta6		AR-7 Sta8
P-DATA-TF PDU		AA-1 Sta13	AA-8 Sta13		AA-8 Sta13	DT-2 Sta6	AR-6 Sta7	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-6 Sta13
A-RELEASE Request primitive						AR-1 Sta7
A-RELEASE-RQ PDU (received on open transport connection)		AA-1 Sta13	AA-8 Sta13		AA-8 Sta13	AR-2 Sta8	AR-8 Sta9 or 10	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-6 Sta13
A-RELEASE-RP PDU (received on transport connection)		AA-1 Sta13	AA-8 Sta13		AA-8 Sta13	AA-8 Sta13	AR-3 Sta1	AA-8 Sta13	AA-8 Sta13	AR-10 Sta12	AR-3 Sta1	AA-8 Sta13	AA-6 Sta13
A-RELEASE Response primitive								AR-4 Sta13	AR-9 Sta11			AR-4 Sta13
A-ABORT Request primitive			AA-1 Sta13	AA-2 Sta1	AA-1 Sta13	AA-1 Sta13	AA-1 Sta13	AA-1 Sta13	AA-1 Sta13	AA-1 Sta13	AA-1 Sta13	AA-1 Sta13
A-ABORT PDU (received on open transport connection)		AA-2 Sta1	AA-3 Sta1		AA-3 Sta1	AA-3 Sta1	AA-3 Sta1	AA-3 Sta1	AA-3 Sta1	AA-3 Sta1	AA-3 Sta1	AA-3 Sta1	AA-2 Sta1
Transport connection closed indication (local transport service)		AA-5 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AA-4 Sta1	AR-5 Sta1
ARTIM timer expired (Association reject/release timer)		AA-2 Sta1											AA-2 Sta1
Unrecognized or invalid PDU received		AA-1 Sta13	AA-8 Sta13		AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-8 Sta13	AA-7 Sta13