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Content for  TS 23.435  Word version:  19.3.0

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9.17 Network Slice Information delivery  9.17.1 General  9.17.2 Procedure  9.17.2.1 Network Slice Information delivery request  9.17.2.2 Network Slice Information delivery to NSCE client request  9.17.3 Information flows  9.17.4 APIs  9.17.4.1 General  9.17.4.2 SS_NSCE_NSInfoDelivery Get operation  9.17.4.3 SS_NSCE_NSInfoDelivery_Client Request operation 
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9.17  Network Slice Information delivery  p. 106

9.17.1  General  p. 106

The NSCE layer provides the feature of Network Slice information delivery. The Network Slice information is necessary for the VAL server to manage the network slice for their service such as preparation, creation, activation and termination (tear-down) of network slice.
The Network Slice information that is delivered to the VAL server depends upon network operator policy. The network slice capabilities and management options offered to the customer are determined by a business agreement prior to and outside of the scope of 3GPP standards.
The NSCE server performs the below.
  • Retrieval of Network Slice ServiceProfile in 5GS (e.g., NSMF) as specified in TS 28.532
  • Conversion of Network Slice ServiceProfile (specified in TS 28.541) to Network Slice Information
  • Creation of Network Slice Information
  • Storing of Network Slice Information
  • Delivery of Network Slice Information to VAL server that the Network Slice Customer is authorized to use.
The VAL server as a Network Slice consumer makes use of the delivered Network Slice information for the Network Slice Lifecycle management for its service.
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9.17.2  Procedure  p. 106

9.17.2.1  Network Slice Information delivery request  p. 106

This subclause depicts the procedure of the Network Slice Information delivery to the VAL server via NSCE server, when the VAL server requests the Network Slice Information after registration.
Pre-condition:
  1. The NSCE server should have the agreement with MNO (NOP) for retrieval of ServiceProfile, if the NSCE server is the external entity.
Reproduction of 3GPP TS 23.435, Fig. 9.17.2.1-1: Network Slice Information delivery request
Figure 9.17.2.1-1: Network Slice Information delivery request
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Step 1.
The NSCE server retrieves the Network Slice ServiceProfile from 5GS (e.g., NSMF) when the NSCE server acting as a NSP prepares a Network Slice to be provided. The NSCE server follows the procedure to request/receive the Network Slice Service Profile with 'getMOIAttributes' operation as specified in TS 28.532.
Step 2.
The NSCE server, as Network Slice as a Service, creates and stores the Network Slice information. When NSCE server retrieves the Network Slice Information, it is necessary for NSCE server to convert the attributes in Network Slice ServiceProfile to the Network Slice information for readable information and to compose the Network Slice information, according to the NSP's policy.
In order to reduce to request often the Network Slice Information Retrieval, the NSCE server stores the Network Slice information.
Step 3.
The VAL server requests the Network Slice Information to the NSCE server. If the VAL server needs to know the specific attribute value for its service, then the attribute name of Network Slice Information (e.g., S-NSSAI, SST, Slice Coverage Area, etc.) can be added in the Request message.
Step 4.
The NSCE server performs to check whether the requesting VAL server is registered or not. The NSCE server identifies which the Network Slice Customer is authorized to use.
Step 5.
The NSCE server sends the Network Slice Information, if the VAL server is registered and authorized. The NSCE server rejects to the request of the Network Slice Information, if not registered.
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9.17.2.2  Network Slice Information delivery to NSCE client request  p. 107

This subclause depicts the procedure of the Network Slice Information delivery to the NSCE client via NSCE server.
Pre-condition:
  1. The network slice has been allocated/created to VAL server.
Reproduction of 3GPP TS 23.435, Fig. 9.17.2.2-1: Network Slice Information delivery to NSCE client
Figure 9.17.2.2-1: Network Slice Information delivery to NSCE client
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Step 1.
The VAL server sends a request to NSCE server to deliver the Network Slice Information to the NSCE Clients. The request includes the network slice information and indication of the UE notification with VAL UE's ID List.
Step 2.
The NSCE server delivers the Network Slice Information to the NSCE Clients of VAL UEs based on the VAL UE's ID list from step 1, in case the Network Slice Allocation is successful, if the NSCE server does not perform AF-driven guidance for URSP determination to 5GS.
The Network Slice Information contains the VAL service ID, S-NSSAI, and DNN.
Step 3.
The NSCE client stores and applies the Network Slice Information.
Step 4.
The NSCE client sends the Network Slice Allocation Information response to the NSCE server.
Step 5.
The NSCE server sends the response to the Network Slice Information delivery to NSCE client request.
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9.17.3  Information flows  p. 108

9.17.3.1  Network Slice Information delivery request  p. 108

Table 9.17.3.1-1 describes the information flows for Network Slice Information delivery from the VAL server to the NSCE server.
Information element Status Description
VAL server IDMThe identifier of the VAL server.
Security credentialsMSecurity credentials resulting from a successful authorization.
VAL service IDMThe VAL service ID of the VAL application.
Requested network slice information listONetwork slice information that is requested by the VAL server.
> S-NSSAI information requestOIndicates to request S-NSSAI.
> SST information requestOIndicates SST.
> Slice Coverage Area information requestOIndicates slice coverage area.
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9.17.3.2  Network Slice Information delivery response  p. 109

Table 9.17.3.2-1 describes the information flows for Network Slice Information delivery response from the NSCE server to the VAL server.
Information element Status Description
ResultMResult includes success or failure of the Network Slice Information delivery request.
> Network slice InformationO
(see NOTE 1)		Network slice information.
>> S-NSSAIOS-NSSAI.
>> SSTOSlice/Service Type.
>> Slice Coverage AreaOCoverage area of the network slice.
> CauseO
(see NOTE 2)		Indicates the cause of Network Slice Information delivery request failure.
NOTE 1:
Shall be present if the result is success and shall not be present otherwise.
NOTE 2:
Shall be present if the result is failure and shall not be present otherwise.
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9.17.3.3  Slice Information delivery to NSCE client  p. 109

Table 9.17.3.3-1 describes information elements for the Slice Information delivery to NSCE client request between the NSCE server and the NSCE client.
Information element Status Description
VAL service IDMThe identifier of the VAL service.
NSCE server ID and addressMThe identifier and address of the NSCE server.
VAL UE ID listOThe identifiers of the VAL UEs which are impacted by the slice modification.
> Network slice informationMNetwork slice information.
>> Network Slice related IdentifierMThe allocated slice identifier.
>> DNNOThe allocated DNN.
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9.17.3.4  Slice Information delivery to NSCE client  p. 109

Table 9.17.3.4-1 describes information elements for the Slice Information delivery to NSCE client response between the NSCE server and the NSCE client.
Information element Status Description
ResultMIndicates the success or failure of the Slice Information delivery.
> CauseO
(see NOTE)		Indicates the cause of Slice Information delivery request failure.
NOTE:
Shall be present if the result is failure and shall not be present otherwise.
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9.17.4  APIs  p. 110

9.17.4.1  General  p. 110

Table 9.17.4.1-1 illustrates the APIs for the Network Slice Information delivery.
API Name API Operations Operation Semantics Consumer(s)
SS_NSCE_NSInfoDeliveryNSInfoDelivery_requestRequest/ResponseVAL Server
Table 9.17.4.1-2 illustrates the APIs for the Network Slice Information delivery to NSCE client.
API Name API Operations Operation Semantics Consumer(s)
SS_NSCE_NSInfoDelivery_ClientNSInfoDelivery_ClientRequest/ResponseVAL Server
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9.17.4.2  SS_NSCE_NSInfoDelivery Get operation  p. 110

API operation name:
SS_NSCE_NSInfoDelivery Get
Description:
The consumer requests to get Network Slice Information.
Inputs:
See clause 9.17.3.1.
Outputs:
See clause 9.17.3.2.
See clause 9.17.2.1 for details of usage of this operation.

9.17.4.3  SS_NSCE_NSInfoDelivery_Client Request operation  p. 110

API operation name:
SS_NSCE_NSInfoDelivery_Client Request
Description:
The consumer requests to deliver the network slice information to NSCE client.
Inputs:
See Table 9.17.3.3-1.
Outputs:
See Table 9.17.3.4-1.
See clause 9.17.2.2 for details of usage of this operation.

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