With the evolution of latest mobile and data networks, the Home Subscriber System (HSS) has hold a central role more and more, gathering all subscriber-specific authorizations and service profiles for both 2G/3G/IMS/VoLTE/ViLTE and LTE contexts.
Italtel has designed i-TDS, a flexible software platform performing both HLR and HSS functionalities which can be decoupled (if necessary), and deployed in virtualized environments, also leveraging Network Function Virtualization (NFV) paradigm. i-TDS can be also configured providing User Profile Server Function (UPSF) functionalities in an NGN environment.
Italtel supports fixed and mobile Service Providers to apply the proper strategies for smooth introduction of additional EPC and VoLTE layers, enabling voice and data services over LTE. A convergent HSS is a key element to migrate seamlessly from traditional fixed and mobile networks to all-IP converged networks.
So i-TDS has been designed to supply all the necessary features to manage this migration process, in compliancy with 3GPP standards.
i-TDS is a future-proof software framework with a distributed common database both for users in fixed and mobile IP networks. This architecture leverages the possibility to deploy soon the common DB repository building up the proper Front-End functionalities when it is needed, managing properly the investments during the network expansion.
Additionally, i-TDS is a virtual appliance, able to run over whatever Data Center using the best in class virtualization software. Finally, i-TDS is a very appealing product:
protecting investments done in existing mobile and fixed networks for voice, SMS services and legacy packet services providing the full set of functionalities when it is configured as HSS-HLR
enabling multiple deployment options including bare-metal architecture (ATCA based) till to virtualization over Cloud, fulfilling all the requirements of the Network Function Virtualization (NFV) specifications
The Italtel Home Subscriber Server (HSS) is a specific configuration of i-TDS, which is able to gather all the user’s profiles both for IMS/VoLTE/ViLTE and for Long Term Evolution (LTE) environment, the latter for data only within mobile networks. It can include also the HLR part aggregating the legacy mobile networks.
The HSS configuration enables the following main features:
identity and authentication management
support for 3GPP LTE and IMS interfaces
support for Voice over LTE (VoLTE/ViLTE) profile according to GSMA IR.92/94
HLR functionalities for 2G/3G users integration with 2G/3G external HLR for authentication functionality
UPSF functionality for NGN users
i-TDS is deployable in High Availability (in the same site) and in Geographical Redundancy (in case of one site unavailability) activating two-way asynchronous replica between the two databases. In this configuration, it is possible to configure both active-standby and active-active scenarios. The latter allows turning on a load sharing access between the two different databases.
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