Home Subscriber Server

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The Home Subscriber Server (HSS) is the central subscriber database in LTE - mobile networks . The function of the HSS corresponds to the function of the Home Location Register (HLR) in GSM or UMTS cellular networks.

Data

In the HSS, all information about the participant is stored that is required

  • to identify a participant and to allow him access to the cellular network,
  • to determine the location of the subscriber and to determine which cellular network components are responsible for him, and
  • to manage the services allowed for a subscriber.

For this purpose, data is stored in the HSS via its mobile radio access, such as

For this purpose, data about the position of the subscriber in the cellular network is stored in the HSS, such as

  • the group of cell phones in which the subscriber is currently staying ( location area ),
  • the cellular core network elements that are currently managing the subscriber (for example the MME or IMS system) in whose area the subscriber is currently staying.

For this purpose, information is stored about the services that a subscriber is allowed to use and which tariff applies to the subscriber.

Behavior of the HSS

HSS systems are in LTE - mobile networks use and services over IMS systems running. If a subscriber switches on his mobile radio device within a corresponding network or if he enters a corresponding network, the mobile radio network searches the HSS system for the subscriber's data. If the subscriber is not in his own network, the home network of the subscriber is determined on the basis of the IMSI and the subscriber data is queried in the subscriber's home network at the HSS.

If it emerges from the requested authentication data that the subscriber is allowed to use the cellular network, he is logged into the cellular network. For this purpose, the responsible core network elements request the subscriber data record from the HSS and temporarily store it locally. The subscriber is managed in the cellular network with the help of the local copy of the subscriber data.

If the subscriber moves in the cellular network, it is determined which area of ​​cellular radio stations has captured the subscriber. This information is passed on to the HSS. With the help of the information about the whereabouts, the cellular network determines which network components are responsible for the subscriber and supplies them with the required subscriber data from the HSS.

If a subscriber calls or requests data via the cellular network (e.g. websites), the data requested from the HSS is used to determine whether he is allowed to use these services and which features are allowed for the subscriber (e.g. maximum Data rate in receiving direction).

Interfaces

The HSS is connected via a diameter interface . The network elements that require HSS data must have appropriate diameter interfaces.

In addition to the scope and format of the stored data, the use of the diameter interface by the HSS represents the main difference compared to the HLR system that is used in GSM or UMTS networks to manage subscriber data. The HLR is connected to the telephone network via SS7 interfaces.

See also

Web links