Content for  TS 28.531  Word version:  18.6.1

5.1.17  Creation of a 3GPP NF  p. 27

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To enable the authorized consumer to request creation of an instance of 3GPP NF.
Actors and Roles	An authorized consumer of the NF creation provisioning management service.
Telecom resources	VNF package(s) of the virtualized part of 3GPP NF; ETSI NFV MANO system; NF provisioning management service producer.
Assumptions	N/A
Pre-conditions	The VNF package(s) of the virtualized part of 3GPP NF have been on-boarded to ETSI NFV MANO system.
Begins when	The authorized consumer needs to create a new instance of 3GPP NF.
Step 1 (M)	The authorized consumer requests the NF provisioning management service producer to create a new instance of 3GPP NF.
Step 2 (M)	The NF provisioning management service producer checks the subject 3GPP NF contains virtualized part and/or non-virtualized part. If it contains virtualized part, then the NF instantiation service producer performs the step 3 and 4 to instantiate the virtualized part of the subject 3GPP NF. How to instantiate the non-virtualized part of the subject 3GPP NF is out of scope of present specification.
Step 3 (M)	The NF provisioning management service producer interacts, or requests another NF provisioning management service producer to interact, with ETSI NFV MANO system to instantiate the VNF(s) that are realizing the virtualized part of subject 3GPP NF.
Step 4 (M)	If all of the contained parts (i.e., virtualized part and non-virtualized part if any) of the 3GPP NF have been successfully instantiated, the NF provisioning management service producer informs the consumer(s) (who have subscribed to the notifications for NF creation) that the instance of 3GPP NF has been created, and creates the MOI(s) for the subject 3GPP NF.
Step 5 (M)	Created MOI(s) may be maintained by a Management Function which has the NF provisioning management service or the 3GPP NF. When the MOI(s) is maintained by the 3GPP NF, the NF provisioning management service producer sends a request of creating the MOI(s) to the corresponding NF provisioning management service producers in the created NF.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The instance of 3GPP NF has been created, and the MOI(s) of the 3GPP NF have been created.
Traceability	REQ-PRO_NF-FUN-1, REQ-PRO_NF-FUN-2, REQ-PRO_NF-FUN-7

5.1.18  Configuration of a 3GPP NF instance  p. 28

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To enable the authorized consumer to request configuration of a 3GPP NF instance.
Actors and Roles	An authorized consumer of the NF provisioning management service.
Telecom resources	ETSI NFV MANO system; NF provisioning management service producer.
Assumptions	N/A
Pre-conditions	The NF to be configured has been instantiated; The MOI of the NF has been created.
Begins when	The authorized consumer needs to configure a 3GPP NF instance.
Step 1 (M)	The consumer requests the NF provisioning management service producer to modify the attribute(s) of the MOI of the 3GPP NF instance.
Step 2 (O)	If the 3GPP NF contains virtualized part and the corresponding VNF instance(s) need to be updated, the NF provisioning management service producer interacts, or requests another NF provisioning management service producer to interact, with ETSI NFV MANO system to update the corresponding VNF instance(s).
Step 3 (M)	The NF provisioning management service producer configures the 3GPP NF instance, per the MOI attribute modification request received from the consumer.
Step 4 (M)	The NF provisioning management service producer modifies the attributes of the MOI and informs the consumer that the 3GPP NF instance has been configured successfully.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The 3GPP NF instance has been configured.
Traceability	REQ-PRO_NF-FUN-4, REQ-PRO_NF-FUN-5, REQ-PRO_NF-FUN-6, REQ-PRO_NF-FUN-3

5.1.19  Creation of a 3GPP sub-network  p. 29

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To enable the authorized consumer to request creation of a 3GPP sub-network.
Actors and Roles	n authorized consumer of the sub-network provisioning management service.
Telecom resources	VNF package(s) of the virtualized part of 3GPP NF(s); NSD(s) of the NS(s); ETSI NFV MANO system; Network provisioning service producer; NF provisioning service producer.
Assumptions	N/A
Pre-conditions	The non-virtualized part of the NFs (including completely non-virtualized NFs) constituting the 3GPP sub-network have been deployed; The VNF package(s) of the virtualized part of 3GPP NF(s) have been on-boarded to ETSI NFV MANO system; The NSD(s) of the NS realizing the 3GPP sub-network have been on-boarded to ETSI NFV MANO system.
Begins when	The authorized consumer needs to create a 3GPP sub-network.
Step 1 (M)	The authorized consumer requests the sub-network provisioning management service producer to create a 3GPP sub-network. The request needs to indicate the network capacity (e.g., the number of instances of each kind of NFs, and the capacity of each NF instance, for example, number of flows with certain QoS attributes to be supported), network topology information (e.g., the connections between NF instances), and the network QoS requirements (e.g., bandwidth and latency requirements of the interface between two NF instances).
Step 2 (M)	The network provisioning management service producer interacts, or requests another network provisioning management service producer to interact, with ETSI NFV MANO system to instantiate the NS(s) realizing the sub-network.
Step 3 (M)	ETSI NFV MANO system informs the NF provisioning management service producer about the instantiation of the NSs and the new VNFs.
Step 4 (M)	The NF provisioning management configuration service producer creates the MOI(s) of the 3GPP NFs that are realized by the newly instantiated VNF(s); there may be MOI(s) that specify the topology of the instantiated NSs.
Step 5 (M)	The sub-network provisioning management service producer is using the NF provisioning management service to configure the 3GPP NF instance(s) that are constituting the subject 3GPP sub-network.	NF configuration service
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The 3GPP sub-network has been created.
Traceability	REQ-PRO_NW-FUN-1, REQ-PRO_NW-FUN-2

5.1.20  Configuration of a 3GPP sub-network  p. 30

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To enable the authorized consumer to request configuration of a 3GPP sub-network.
Actors and Roles	An authorized consumer of the network provisioning management service.
Telecom resources	3GPP network; 3GPP NFs; ETSI NFG MANO system; Network provisioning management service producer.
Assumptions	N/A
Pre-conditions	The 3GPP sub-network has been created; The MOI(s) related to the sub-network has been created.
Begins when	The authorized consumer needs to configure a 3GPP sub-network.
Step 1 (M)	The authorized consumer requests to configure a 3GPP sub-network.
Step 2 (M)	The consumer requests the network provisioning management management service producer to modify the attribute of the MOI(s) related to the 3GPP sub-network.
Step 3 (O)	If the 3GPP network is realized by NS(s) (ETSI ISG NFV concept), the network provisioning management service producer requests (directly or indirectly via another) ETSI NFV MANO system to update the NS(s) realizing the 3GPP sub-network.
Step 4 (O)	If there are new VNFs instantiated by the NS update, ETSI NFV MANO system informs the NF provisioning management service producer about the instantiation of VNFs.
Step 5 (O)	The NF provisioning management service producer creates the MOI(s) of the 3GPP NFs that are realized by the newly instantiated VNF(s).
Step 6 (M)	The network provisioning management service producer consumes the NF provisioning management service to configure the impacted 3GPP NF instance(s).	NF configuration service
Step 7 (M)	The network provisioning management service producer configures the 3GPP sub-network, per the MOI attribute modification request received from the consumer.
Step 8 (M)	The NF provisioning management service producer modifies the attributes of the MOI(s) of the 3GPP network and informs the consumer that the 3GPP sub-network has been configured successfully.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The 3GPP network has been configured.
Traceability	REQ-PRO_NW-FUN-3, REQ-PRO_NW-FUN-4

5.1.21  Network slice subnet feasibility check  p. 31

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To check the feasibility of provisioning a network slice subnet to determine whether network slice subnet requirements can be satisfied at a particular point of time (e.g., in terms of resources)
Actors and Roles	Network slice subnet management service consumer. For example, when a network slice subnet instance is to be provided as a constituent of a network slice instance.
Telecom resources	Network slice subnet instance Network slice management service provider. For example, a management function that plays the role of network slice management service provider.
Assumptions	Network slice subnet management service consumer has decided to check the feasibility of provisioning a network slice subnet based on, for example, internal decision or to facilitate an external service requests.
Pre-conditions	Network slice subnet requirements have been derived or received by network slice subnet management service consumer.
Begins when	Network slice subnet management service provider receives the request to evaluate the feasibility of provisioning a network slice subnet according to the network slice requirements at a particular point in time.
Step 1 (M)	Network slice subnet management service provider identifies the network slice subnets constituents according to the requirements, e.g., network services to be requested from MANO.
Step 2 (O)	For the purpose of checking the feasibility of provisioning a network slice subnet(s) of the network slice instance, network slice subnet management service provider(s) may obtain information from the network (e.g., current or predicted load level information, current or predicted resource usage information from management data analytics services).
Step 3 (M)	Network slice subnet management service provider sends enquiries with reservation requests to other management providers (e.g., MANO) to determine availability of network constituents, e.g., network services, network functions. If some of the responses are negative, network slice subnet management service provider may send enquiries to different management providers.
Ends when	Feasibility check results have been provided to network slice subnet management service consumer.
Exceptions	One of the mandatory steps fails.
Post-conditions	N/A
Traceability

5.1.22  Void

5.1.23  Network slice subnet management with assigned priority  p. 32

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To assign priority on existing network slice subnet instance(s).
Actors and Roles	Network slice subnet provisioning management service consumer. Network slice subnet provisioning management service provider (e.g. NSSMF)
Telecom resources	Network slice subnet instance (i.e. NSSI) Network slice subnet provisioning management service provider
Assumptions	Network slice subnet instance is deployed to support a communication service with priority, set by the operator.
Pre-conditions	This use case is based on the condition that operator requires a priority assigned to network slice subnet.
Begins when	The NSSI(s) should have been assigned with priority set by the operator.
Step 1 (M)	The network slice provisioning management service provider identifies the NSSI(s) that needs to be associated with the priority, requested by authorized network slice subnet provisioning management service consumer. The network slice provisioning management service provider assigns priority to the identified NSSI(s)	Network slice subnet instance modification use case
Step 2 (M)	The network slice provisioning management service provider sends response to its authorized consumer about assigned priority on identified NSSI(s).
Ends when	All the steps identified above are successfully completed. Network slice subnet priority was assigned by the network slice subnet management service provider.
Exceptions	One of the steps identified above fails.
Post-conditions
Traceability	REQ-PRO_NSI-FUN-9

5.1.24  Management interaction with NFV MANO for network service priority  p. 32

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To enable the authorized consumer to request creation of a 3GPP sub-network, management interactions with NFV MANO is needed. This management interaction will assign priority on NFV NS(s).
Actors and Roles	An authorized consumer of 3GPP sub-network creation.
Telecom resources	VNF package(s) of the virtualized part of 3GPP NF(s); NSD(s) of the NS(s); ETSI NFV MANO system;
Assumptions	N/A
Pre-conditions	The ETSI NFV VNF package(s) of the virtualized part of 3GPP NF(s) have been on-boarded to ETSI NFV MANO system; The ETSI NFV NSD(s) used to instantiate NS(s) for realizing the 3GPP sub-network have been on-boarded to ETSI NFV MANO system.
Begins when	The authorized consumer needs to create a 3GPP sub-network. This creation operation also needs to assign priority on 3GPP sub-network and on related ETSI NFV NS(s).
Step 1 (M)	The authorized consumer requests the 3GPP sub-network creation service producer to create a 3GPP sub-network.
Step 2 (M)	The sub-network creation service producer interacts, or requests another sub-network creation service producer to interact, with ETSI NFV MANO system to instantiate the NS(s) realizing the 3GPP sub-network.
Step 3 (M)	ETSI NFV MANO is informed about NS priority.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The 3GPP sub-network has been created. Network service priority is identified by NFVO to support the 3GPP sub-network.
Traceability	REQ-PRO_NW-FUN-1, REQ-PRO_NW-FUN-2

5.1.25  Void

5.1.26  Obtaining network slice subnet provider capability information |R17|  p. 33

Use case stage	Evolution/Specification	<<Uses>> Related use
Goal	To satisfy the query for obtaining network slice subnet provider capability information.
Actors and Roles	Network slice subnet provisioning management service consumer.
Telecom resources	Network slice subnet provider capabilities
Assumptions	N/A
Pre-conditions	N/A
Begins when	A network slice subnet provisioning management service consumer wants to obtain the network slice subnet provider capability information
Step 1 (M)	The network slice subnet provisioning management service provider receives the request from its authorized consumer querying as to what the network slice subnet provisioning management service provider is capable of supporting.
Step 2 (M)	The network slice subnet provisioning management service provider processes the request.
Step 3 (M)	The network slice subnet provisioning management service provider sends the result of network slice subnet provider capability information request to the network slice subnet provisioning management service consumer.
Ends when	All the steps identified above are successfully completed.
Exceptions	One of the steps identified above fails.
Post-conditions	The query for obtaining network slice subnet capability information has been satisfied.
Traceability	REQ-PRO_NSSI-FUN-19