Content for TS 28.515 Word version: 18.0.0
5 Business level requirements
5.1 Requirements
5.2 Actor roles
5.3 Telecommunications resources
5.4 High-level use cases
5 Business level requirements p. 6
5.1 Requirements p. 6
REQ-NFV_FM-CON-1
The faulty virtualization-specific aspect of a virtualized network function shall be able to be recovered.
REQ-NFV_FM-CON-2
3GPP management system shall be able to get VNF application fault reports about a faulty NE.
REQ-NFV_FM-CON-3
3GPP management system shall be able to get VNF virtualization-related fault reports from NFV-MANO.
REQ-NFV_FM-CON-4
The content of the fault information from VNF application fault reports and VNF virtualization-related fault reports shall enable 3GPP management system to correlate VNF application fault(s) with VNF virtualization-related fault(s).
REQ-NFV_FM-CON-5
EM shall be able to send to VNFM a request to recover the faulty virtualization-specific aspect of a virtualized network function.
5.2 Actor roles p. 6
See actors and roles of each use case in clause 5.4.
5.3 Telecommunications resources p. 6
See telecom resources of each use case in clause 5.4.
5.4 High-level use cases p. 7
5.4.1 NE alarm correlation in the context of NFV p. 7
| Use Case Stage | Evolution/Specification | <<Uses>> Related use |
|---|---|---|
| Goal | To correlate NE alarms in a mobile network that includes virtualized network functions. | |
| Actors and Roles | 3GPP management system (EM, NM) correlates NE alarms. NFV MANO functional entity VNFM notifies virtualized resource alarms to 3GPP management system. | |
| Telecom resources | VNFM, 3GPP management system (EM, NM) | |
| Assumptions | - 3GPP management system can get VNF application alarms of the faulty NE, and - VNFM can get virtualized resource alarms and identify the corresponding VNF instance. | |
| Pre conditions | N/A | |
| Begins when | There is a new failure which may impact the virtualized resource and the corresponding NE application | |
| Step 1 (M) | 3GPP management system gets VNF application alarm(s) of a faulty NE. VNFM gets virtualized resource alarm(s) and notifies the corresponding VNF instance related virtualized resource alarm(s) to 3GPP management system. | |
| Step 2 (M) | Based on the virtualized resource alarm(s) sent from VNFM and those VNF application alarms reported from NE, 3GPP management system makes alarm correlation. | |
| Ends when | Ends when all mandatory steps identified above are successfully completed or when an exception occurs. | |
| Exceptions | One of the steps identified above fails. | |
| Post Conditions | The virtualized resource alarm(s) and VNF application alarm(s) are correlated by 3GPP management system. | |
| Traceability | REQ-MAMO_FM-CON-3, REQ-MAMO_FM-CON-4, REQ-MAMO_FM-CON-5 |
5.4.2 NFVI Maintenance coordination p. 7
| Use Case Stage | Evolution/Specification | <<Uses>> Related use |
|---|---|---|
| Goal | To avoid the unwanted impact to VNF application from NFVI maintenance | |
| Actors and Roles | NM, NFVO, VNFM, VIM | |
| Telecom resources | NFVO, VNFM VIM, NFVI | |
| Assumptions | There is an agreement that NFV-MANO system should get permission from NM before scheduled NFVI maintenance, managed by NFV-MANO, can start. | |
| Pre conditions | N/A | |
| Begins when | NFVO receives a notification from VIM informing about NFVI maintenance impacting the VRs (Virtualised Resources) that are used by a NS instance (e.g. the subordinative VNF instances and Virtual Links). | |
| Step 1 (M) | NFVO informs NM about the NFVI maintenance. | |
| Step 2 (M) | NM confirms the NFVI maintenance positively or not positively. | |
| Step 3 (M) | NFVO acts according to the response from NM. | |
| Ends when | Ends when all mandatory steps identified above are successfully completed or when an exception occurs. | |
| Exceptions | One of the steps identified above fails. | |
| Post Conditions | NFVI maintenance activity has been coordinated between NM and NFVO. | |
| Traceability | FFS |
