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Content for  TS 28.531  Word version:  17.1.0

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5.1.16  Network slice subnet instance management capability exposureWord‑p. 26

Use case stage Evolution/Specification <<Uses>> Related use
GoalEnable authorized NSS management service consumer to obtain network slice subnet management capability (e.g. obtaining measurement, updating resource allocations).
Actors and RolesNSS management service consumer (e.g., the operator)
Telecom resourcesNSS management service provider
Network slice subnet instance
NF(s)
AssumptionsThe NSS management service consumer is authorized to obtain the allowed management capability from NSS management service provider.
Pre-conditionsNSSI is created.
Begins whenThe NSS management service consumer wants to obtain the network slice subnet management capability.
Step 1 (M)The NSS management service consumer sends a request to NSS management service provider to obtain the network slice subnet instance management capability.
The information indicating which specific management capability need to be obtained may be included in the request.
Step 2 (M)The NSS management service provider processes this request.
Step 3 (M)The NSS management service provider provides the required exposure interfaces to the NSS management service consumer.
Ends whenAll the steps identified above are successfully completed.
ExceptionsOne of the steps identified above fails.
Post-conditionsThe NSS management service consumer obtained the allowed network slice subnet instance management capability.
TraceabilityREQ-PRO_NSSI-FUN-15
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5.1.17  Creation of a 3GPP NFWord‑p. 27

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo enable the authorized consumer to request creation of an instance of 3GPP NF.
Actors and RolesAn authorized consumer of the NF creation provisioning management service.
Telecom resourcesVNF package(s) of the virtualized part of 3GPP NF;
ETSI NFV MANO system;
NF provisioning management creation service producer.
AssumptionsN/A
Pre-conditionsThe VNF package(s) of the virtualized part of 3GPP NF have been on-boarded to ETSI NFV MANO system.
Begins whenThe authorized consumer needs to create a new instance of 3GPP NF.
Step 1 (M)The authorized consumer requests the NF provisioning management creation service producer to create a new instance of 3GPP NF.
Step 2 (M)The NF provisioning management creation 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 creation service producer interacts, or requests another NF provisioning management creation 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 creation 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 creation service or the 3GPP NF. When the MOI(s) is maintained by the 3GPP NF, the NF provisioning management creation service producer sends a request of creating the MOI(s) to the corresponding NF provisioning management service producers in the created NF.
Ends whenAll the steps identified above are successfully completed.
ExceptionsOne of the steps identified above fails.
Post-conditionsThe instance of 3GPP NF has been created, and the MOI(s) of the 3GPP NF have been created.
TraceabilityREQ-PRO_NF-FUN-1, REQ-PRO_NF-FUN-2, REQ-PRO_NF-FUN-7
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5.1.18  Configuration of a 3GPP NF instanceWord‑p. 28

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo enable the authorized consumer to request configuration of a 3GPP NF instance.
Actors and RolesAn authorized consumer of the NF provisioning management service.
Telecom resourcesETSI NFV MANO system;
NF provisioning management service producer.
AssumptionsN/A
Pre-conditionsThe NF to be configured has been instantiated;
The MOI of the NF has been created.
Begins whenThe 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 whenAll the steps identified above are successfully completed.
ExceptionsOne of the steps identified above fails.
Post-conditionsThe 3GPP NF instance has been configured.
TraceabilityREQ-PRO_NF-FUN-4, REQ-PRO_NF-FUN-5, REQ-PRO_NF-FUN-6, REQ-PRO_NF-FUN-3
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5.1.19  Creation of a 3GPP sub-networkWord‑p. 29

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo enable the authorized consumer to request creation of a 3GPP sub-network.
Actors and RolesAn authorized consumer of the sub-network provisioning managementcreation service.
Telecom resourcesVNF package(s) of the virtualized part of 3GPP NF(s); NSD(s) of the NS(s);
ETSI NFV MANO system;
Network creation provisioning service producer;
NF provisioningconfiguration service producer.
AssumptionsN/A
Pre-conditionsThe 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 whenThe authorized consumer needs to create a 3GPP sub-network.
Step 1 (M)The authorized consumer requests the sub-network provisioning creation 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 creation service producer interacts, or requests another network provisioning managementcreation 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 managementconfiguration 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 managementcreation service producer is using the NF provisioning managementconfiguration service to configure the 3GPP NF instance(s) that are constituting the subject 3GPP sub-network.NF configuration service
Ends whenAll the steps identified above are successfully completed.
ExceptionsOne of the steps identified above fails.
Post-conditionsThe 3GPP sub-network has been created.
TraceabilityREQ-PRO_NW-FUN-1, REQ-PRO_NW-FUN-2
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5.1.20  Configuration of a 3GPP sub-networkWord‑p. 30

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo enable the authorized consumer to request configuration of a 3GPP sub-network.
Actors and RolesAn authorized consumer of the network provisioning managementconfiguration service.
Telecom resources3GPP network;
3GPP NFs;
ETSI NFG MANO system;
Network provisioning management service producer.
AssumptionsN/A
Pre-conditionsThe 3GPP sub-network has been created;
The MOI(s) related to the sub-network has been created.
Begins whenThe 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 whenAll the steps identified above are successfully completed.
ExceptionsOne of the steps identified above fails.
Post-conditionsThe 3GPP network has been configured.
TraceabilityREQ-PRO_NW-FUN-3, REQ-PRO_NW-FUN-4
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5.1.21  Network slice subnet feasibility checkWord‑p. 31

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo 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 RolesNetwork 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 resourcesNetwork slice subnet instance
Network slice management service provider. For example, a management function that plays the role of network slice management service provider.
AssumptionsNetwork 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-conditionsNetwork slice subnet requirements have been derived or received by network slice subnet management service consumer.
Begins whenNetwork 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 whenFeasibility check results have been provided to network slice subnet management service consumer.
ExceptionsOne of the mandatory steps fails.
Post-conditionsN/A
Traceability
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5.1.22  Network slice resource capacity planningWord‑p. 32

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo calculate capacity of network slice instances and network slice subnet instances.
Actors and RolesNetwork slice management service consumer. For example, NSMF or NSSMF plays the role of network slice management service consumer.
Telecom resourcesNetwork slice instance
Network slice subnet instance
Network slice management service provider. For example, NSMF or NSSMF plays the role of network slice management service provider.
AssumptionsThe Network network slice management service consumer has decided to perform network slice resource capacity optimization process.
Pre-conditionsNetwork slice resource capacity optimization objectives are set by the network slice management service consumer.
Begins whenThe network slice management service consumer requests resource capacity planning of the NSIs and/or NSSIs when the pre-set resource optimization objectives need to be satisfied.
Step 1 (M)The network slice management service provider obtains information needed for the optimization process such as slice provisioning requirements, existing active or non-active NSI and/or NSSI resource information, and performance measurement data by requesting feasibility check operation.
Step 2 (M)The network slice management service provider performs resource optimization process based on the information obtained in Step 1. The goal of the process is to find an optimal capacity availability against the target objective
Step 3 (M)The network slice management service provider proceeds with network slice (NSI and/or NSSI) provisioning or modification processes until it meets the resource capacity optimization objective.Network slice instance creation or modification/network slice subnet instance creation or modification use cases
Step 4 (M)The network slice management service provider updates capacity availability information after provisioning or modification processes.
Ends whenThe capacity resource planning ends when it meets the optimization objective.
ExceptionsOne of the mandatory steps fails.
Post-conditionsCapacity planning policy for either provisioning or modification is generated.
TraceabilityREQ-PRO_NSSI-FUN-3, REQ-PRO_NSI-FUN-9
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5.1.23  Network slice subnet management with assigned priorityWord‑p. 33

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo assign priority on existing network slice subnet instance(s).
Actors and RolesNetwork slice subnet provisioning management service consumer. Network slice subnet provisioning management service provider (e.g. NSSMF)
Telecom resourcesNetwork slice subnet instance (i.e. NSSI) Network slice subnet provisioning management service provider
AssumptionsNetwork slice subnet instance is deployed to support a communication service with priority, set by the operator.
Pre-conditionsThis use case is based on the condition that operator requires a priority assigned to network slice subnet.
Begins whenThe 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 whenAll the steps identified above are successfully completed. Network slice subnet priority was assigned by the network slice subnet management service provider.
ExceptionsOne of the steps identified above fails.
Post-conditions
TraceabilityREQ-PRO_NSI-FUN-x
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5.1.24  Management interaction with NFV MANO for network service priorityWord‑p. 33

Use case stage Evolution/Specification <<Uses>> Related use
GoalTo 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 RolesAn authorized consumer of 3GPP sub-network creation.
Telecom resourcesVNF package(s) of the virtualized part of 3GPP NF(s);
NSD(s) of the NS(s);
ETSI NFV MANO system;
AssumptionsN/A
Pre-conditionsThe 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 whenThe 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 whenAll the steps identified above are successfully completed.
ExceptionsOne of the steps identified above fails.
Post-conditionsThe 3GPP sub-network has been created. Network service priority is identified by NFVO to support the 3GPP sub-network.
TraceabilityREQ-PRO_NW-FUN-1, REQ-PRO_NW-FUN-2
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