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Product Overview
ZXUN NSR Network Function Service Repository
ZXUN NSR (Network Function Service Repository) realizes the functions of NRF (NF Repository Function), NSSF (Network Slice Selection Function) and Gn-DNS in the 3GPP architecture. It supports NRF functions such as NF management, NF discovery and NF OAuth to help 5GC NFs & services realize plug and play. It supports NSSF functions such as network slice selection, NSSAI availability to help end users realize slice-level user experience. It supports multiple DNS query types such as A, AAAA, SRV, NAPTR and S-NAPTR and multiple DNS query modes such as recursive query and iterative query to meet the domain name parse requirements of NEs.

Major Functions:
NRF: Providing functions such as NF registration, NF update and NF subscription/notification, to achieve automation NF management in the 5GC SBA; Providing NF & service dynamic discovery services for local NFs and roaming NFs; Providing an oAuth2-based authorization mechanism to prevent illegal NF access to the network and ensure network security of the communication between NFs
NSSF: Providing information such as allowed NSSAI, configured NSSAI and target AMF set to the initial AMF to assist AMF to implement re-allocation; Providing the NRF ID and NSI ID to AMF, to assist AMF to select SMF in local/roaming scenarios; Providing TA-based NSSAI availability management and supporting subscription, unsubscription, update, notification and deletion for NSSAI-related availability information
Gn-DNS: Providing the mobile network DNS function and supporting multiple query methods such as recursive query and iterative query
Product Advantages:
Advanced Architecture: Convergence of NRF, NSSF and Gn-DNS
Simplified O&M: One-click deployment; Elastic scaling

Customer Benefits:
Fast Provisioning: ZXUN NSR supports NFV to realize on-demand elastic scaling and rapid system deployment, helping the cloud-based transformation of operator's services.

OPEX Reduction: The convergence between NRF and Gn-DNS reduces the number of network failure nodes and simplifies operation and maintenance.
On-Demand Deployment: NRF supports multiple deployment modes such as PLMN and shared-slice to help operators deploy the system on demand.

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