Home Subscriber Server ZXUN HSS (Home Subscriber Server) is one of ZXUN USPP products to manage ZTE user's data of the unified core network, and it is one user data management network element of IMS (IP Multimedia Subsystem) core network. IMS is submitted by 3GPP in Release 5 version to support the IP multimedia subsystem. In the 3GPP Release 5 stages, HLR / AUC network element upgraded to HSS, in addition to the original interfaces functions with the CS and PS domain network element. It adds new interface functions with IMS domain network element, including mobility management, session establishment, and features such as generating authentication information.


Distributed architecture
All of the features entities have the linear distribution entity. Thus, it realizes smooth dynamic expansion and is easy to acquire larger capacity.
All of the features entities have the geographical distribution .So it may provide a natural disaster recovery capabilities ensuring higher reliability.

Full integration
ZXUN HSS supports multi-network, multi-service integration and has the ability of evolution. It simultaneously supports PSTN, PHS, GSM, UMTS, TD-SCDMA, CDMA, IMS, WiMAX, wide-narrow-band access network user data storage and service processes. It is integrated with SHLR, PHS HLR, GSM / UMTS HLR, CDMA HLRe, HSS, EIR, MNP, FNR, AAA and other network entities. 
ZXUN HSS realizes easily network evolution, network element integration and management; benefits to the introduction of new services and the service integration; facilitates data mining and analysis capabilities. With data fusion, it leads to easy integration or converged services. The Operators regain control of network, users, and services from converged data application, which enhances the commercial value of primary data.

Open interface
ZXUN HSS supports the loosely coupled data and services. It realizes the linear expansion based on requirement; greatly reduces the operational time of the introduction service time and loads the service online. Open interface provides a strong guarantee for many manufacturers’ faster development and customized service.

High reliability
ZXUN HSS adopts memory / local disk / Magnetic Array Three-tier data storage mechanism, and fully guarantees the user data security to help operators to establish a highly efficient, highly reliable, highly secure network.

Large capacity, high integration and high-performance
ZXUN HSS provides a large capacity, high integration, and high-performance, and reduces the number of nodes to simplify the network structure, CAPEX, and OPEX.