Content for  TS 28.531  Word version:  18.1.0

5.1.8  Network slice instance deactivation  p. 19

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To deactivate an existing network slice instance which is active.
Actors and Roles	Network slice provisioning management service consumer. For example, CSP providing NSaaS plays the role of network slice provisioning management service consumer.
Telecom resources	Network slice instance Network slice provisioning management service provider. Network slice subnet provisioning management service provider.
Assumptions	N/A
Pre-conditions	NSI has already been created and it is active.
Begins when	The network slice provisioning management service provider decides to deactivate an NSI based on the received network slice related request from its authorized consumer.
Step 1 (M)	The network slice provisioning management service provider stops the NSI serving its subscribers.
Step 2 (M)	The network slice provisioning management service provider checks whether NSSIs associated with the NSI are all inactive. If there is an active NSSI, the network slice provisioning management service provider requests the network slice subnet provisioning management service provider to deactivate the corresponding NSSI. The network slice subnet provisioning management service provider receives the request and decides if the NSSI will be disassociated and deactivated.	Network slice subnet instance deactivation use case
Step 3 (M)	The network slice provisioning management service provider receives response from the network slice subnet provisioning management service provider that the NSSI deactivation request has been processed.
Step 4 (M)	The network slice provisioning management service provider deactivates the NSI and sends response to its authorized consumer.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	An NSI has been deactivated.
Traceability	REQ-PRO_NSI-FUN-5

5.1.9  Network slice instance modification  p. 20

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To modify an existing network slice instance
Actors and Roles	Network slice provisioning management service consumer. See NOTE.
Telecom resources	Network slice instance Network slice provisioning management service provider.
Assumptions	N/A
Pre-conditions	N/A
Begins when	The network slice provisioning management service provider receives request from its authorized customer with new set of network slice related requirements and decides to modify an existing NSI.
Step 1 (M)	The network slice provisioning management service provider identifies the NSSI(s) associated with the NSI to be modified and generates network slice subnet related requirements for the NSSI(s).
Step 2 (M)	The network slice provisioning management service provider sends requests to the network slice subnet provisioning management service provider with new sets of network slice subnet related requirements. The network slice provisioning management service provider receives request and decides whether the NSSI needs to be modified.	Network slice subnet instance modification use case
Step 3 (M)	The network slice provisioning management service provider receives the response from the network slice subnet provisioning management service provider. If the NSSI modification request cannot be satisfied by the network slice subnet provisioning management service provider, the network slice provisioning management service provider may re-generate the network slice subnet related requirements for the NSSI and go to step 2, or the network slice provisioning management service provider may decide the modification request cannot be satisfied.
Step 4 (M)	The network slice provisioning management service provider sends response to its authorized consumer.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The NSI is modified.
Traceability	REQ-PRO_NSI-FUN-6
NOTE: Examples of roles and actors for this use case can be found in TS 28.530.

5.1.10  Network slice subnet instance activation  p. 21

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To activate an existing network slice subnet instance which is inactive.
Actors and Roles	Network slice subnet provisioning management service consumer.
Telecom resources	Network slice subnet instance Network slice subnet provisioning management service provider.
Assumptions	N/A
Pre-conditions	An NSSI has already been created and it is inactive.
Begins when	The network slice subnet provisioning management service provider decides to activate an NSSI based on the received network slice subnet related request from its authorized consumer.
Step 1 (M)	The network slice subnet provisioning management service provider identifies inactive constituents (e.g. NSSI, NF) of the NSSI and decides to activate those constituents.
Step 2 (M)	If the constituent of NSSI is managed directly by the the network slice subnet provisioning management service provider, the network slice subnet provisioning management service provider activates the NSSI constituent directly.
Step 3 (M)	If an NSSI constituent is managed by other network slice subnet provisioning management service provider, the network slice subnet provisioning management service provider requests other network slice subnet provisioning management service provider to activate the constituent NSSI.
Step 4 (M)	If an NSSI constituent is an NF managed by NF related provisioning management service provider, the network slice subnet provisioning management service provider request the NF related provisioning management service provider to activate the NF (e.g., activate the NF in sleep mode, turn on the ports).
Step 5 (M)	The network slice subnet provisioning management service provider receives response indicating that NSSI constituents are all activated.
Step 6 (M)	The network slice subnet provisioning management service provider activates the network slice subnet instance and sends response to its authorized consumer.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	An NSSI has been activated.
Traceability	REQ-PRO_NSSI-FUN-9

5.1.11  Network slice subnet instance deactivation  p. 22

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To deactivate an existing network slice subnet instance which is active.
Actors and Roles	Network slice subnet provisioning management service consumer.
Telecom resources	Network slice subnet instance. Network slice subnet provisioning management service provider.
Assumptions	N/A
Pre-conditions	An NSSI has already been created and is active.
Begins when	The network slice subnet provisioning management service provider decides to deactivate an NSSI based on the received network slice subnet related request from its authorized customer.
Step 1 (M)	The network slice subnet provisioning management service provider identifies the NSSI constituents that need to be deactivated.
Step 2 (M)	If the constituent of NSSI is managed directly by the network slice subnet provisioning management service provider, the network slice subnet provisioning management service provider deactivates the NSSI constituent directly.
Step 3 (M)	If an NSSI constituent is managed by other network slice subnet provisioning management service provider, the network slice subnet provisioning management service provider requests other network slice subnet provisioning management service provider to deactivate the constituent NSSI.
Step 4 (M)	If an NSSI constituent is managed by the NF related provisioning management service provider, the network slice subnet provisioning management service provider requests the NF related provisioning management service provider to either deactivate the NF (if it is dedicated for this NSSI and not being used by any other NSSI) or to modify the NF (if it is shared by other NSSI).
Step 5 (M)	The network slice subnet provisioning management service provider receives response indicating that corresponding NSSI constituents are deactivated or not deactivated (e.g., shared constituents cannot be deactivated).
Step 6 (M)	The network slice subnet provisioning management service provider deactivates the network slice subnet instance and send response to its authorized consumer.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	A network slice subnet instance has been deactivated.
Traceability	REQ-PRO_NSSI-FUN-10

5.1.12  Network slice subnet instance modification  p. 23

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To modify an existing network slice subnet instance
Actors and Roles	Network slice subnet provisioning management service consumer.
Telecom resources	Network slice subnet instance Network SliceSubnet slice subnet provisioning management service provider.
Assumptions	N/A
Pre-conditions	N/A
Begins when	The network slice subnet provisioning management service provider receives request from its authorized consumer with new sets of network slice subnet related requirements and decides to modify an existing NSSI.
Step 1 (M)	TThe network slice subnet provisioning management service provider identifies the NSSI constituents as well as the transport network (TN) part within the NSSI that needs to be modified, and generates new sets of requirements for the NSSI constituents and transport network if needed.
Step 2 (M)	The network slice subnet provisioning management service provider checks whether the requirements for the identified NSSI constituents managed by itself could be satisfied, and then triggers the modification of the corresponding NSSI constituents if needed.
Step 3 (M)	If the NSSI consists of constituent NSSI managed by other network slice subnet provisioning management service provider, and the constituent NSSI is identified to be modified, the network slice subnet provisioning management service provider sends modification request to other network slice subnet provisioning management service provider which manages the constituent NSSI with new sets of constituent NSSI requirements.	Network slice subnet instance modification use case
Step 4 (M)	IIf the NS instance associated with the NSSI needs to be modified, the network slice subnet provisioning management service provider derives the new sets of NS related requirements and triggers corresponding NS instance request to NFVO with Os-Ma-nfvo interface as described in clause 6.4.3 of TS 28.525.	Clause 6.4.3 of TS 28.525 NS instance use cases
Step 5 (M)	If the related TN part of the NSSI is identified to be modified, the network slice subnet provisioning management service provider derives new sets of requirements for the TN part and coordinates with the corresponding TN management system.
Step 6 (M)	The network slice subnet provisioning management service provider generates the modification result based on the received response and send response to its authorized consumer.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The NSSI is modified.
Traceability	REQ-PRO_NSSI-FUN-11

5.1.13  Network slice subnet configuration  p. 24

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To provide service for slice-specific (re)configuration of NSSI.
Actors and Roles	Network slice subnet provisioning management service consumer (e.g., the operator)
Telecom resources	Network slice subnet provisioning management service provider (e.g., NSSMF) Network slice subnet instance NF(s)
Assumptions	Authorized network slice subnet provisioning management service consumer provide slice operation information (see 4.2) for (re-)configuring NSSI constituents.
Pre-conditions	NSSI exists.
Begins when	The network slice subnet provisioning management service consumer wants to (re-)configure the constituents of a NSSI.
Step 1 (M)	The network slice subnet provisioning management service consumer sends requests to the network slice subnet provisioning NSS management service provider with slice operation information for (re-)configuring a network slice subnet.
Step 2 (M)	The network slice subnet provisioning management service provider (derives and) decomposes the received slice operation information, and then makes them as separate CM requests for each constituent if necessary and applicable. These (decomposed) requests may be delegated to other provisioning management service providers (e.g., other network slice subnet provisioning service providers, NF provisioning management service providers) with corresponding slice operation information. These requests may contain configuration for specific NFs such as 1) Configuration of dedicated NFs (e.g., configure the SMF with the information of new instantiated UPFs, see clauses 5.3.2, 5.3.3 in TS 28.541) and 2) Configuration of shared NFs (see clause 4.2 so that this information can be accessed by other constituents of the NSS (e.g., NSSF, AMF, SMF).
Step 3 (M)	the network slice subnet provisioning management service provider sends the processing result to the network slice subnet provisioning management service consumer (might be based on applicable processing results from other CM service providers).
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The required (re)configuration is configured at the corresponding constituent(s).
Traceability	REQ-PRO_NSSI-FUN-16

5.1.14  Obtaining network slice management data  p. 25

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	Enable network slice management service consumer to obtain network slice management data (e.g. PM data, FM data).
Actors and Roles	Network slice management service consumer. Network slice management service provider. Network slice management service provider.
Telecom resources	Network slice instance
Assumptions	The network slice management service consumer is authorized to obtain the network slice management data from the network slice management service provider.
Pre-conditions	NSI is created.
Begins when	The network slice management service consumer wants to obtain the network slice management data.
Step 1 (M)	The network slice management service consumer sends a request to the network slice management service provider to obtain the network slice management data.
Step 2 (M)	The network slice management service provider provides the network slice management service consumer with the network slice management data .
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The network slice management service consumer obtained the network slice management data.
Traceability	REQ-PRO_NSI-FUN-7

5.1.15  Void

5.1.16  Void