1. Feature Guide
  2. DSR Features and Functions
  3. DSR system architecture
  4. Session or Subscriber Binding Repository

2.2.5 Session or Subscriber Binding Repository

The SBR stores diameter sessions and subscriber bindings for stateful applications. The Policy Charging Application (PCA) supports Policy DRA (P-DRA) and Online Charging DRA (OC-DRA) functionalities. OC-DRA uses session database SBRs (SBR(s)) and policy DRA uses both session database SBRs (SBR(s)) and subscriber binding database SBR’s (SBR(b)). Throughout this document the SBRs are referred to individually when there are significant differences discussed, and referred as SBR, without distinguishing the application, when the attribute applies to all types.

Key characteristics of an SBR are as follows:

  • Optional component of the DSR.
  • Provides repository for subscriber and session state data.
  • Provides DSRs with network-wide access to bindings.
  • Provides procedures for in-service augmentation of the DSR signaling node-to-session SBR database relationships.

A number of capabilities are available to allow the SBR to be reconfigured once deployed including:

  • Binding SBR capacity Growth/Degrowth: Allows in-service growth and degrowth of the Binding SBR database capacity in an existing P-DRA deployment, to include augmenting the physical location of the Binding SBR servers.
  • Session SBR Capacity Growth/Degrowth: Allows in-service growth and degrowth of the Session SBR database capacity in an existing P-DRA / OC-DRA deployment, to include augmenting the physical location of the Session SBR servers.
  • SBR Data Migration of a Session SBR Database: Allows reconfiguring an SBR Database topology by moving data from one data base to another such as: Mating/Un-Mating/Re-Mating. SBR data migration plan is used to move from an initial SBD DB to a target SBR DB without affecting traffic.
  • Per mated pair sizing of Session SBR: Supports independent sizing of the Session SBR databases in a P-DRA / OC-DRA network managed by a common DSR NOAM.
  • P-DRA support for 2.1M network wide MPS on P-DRA: Provides world-class scaling of policy network traffic, supporting up to 2.1 M network wide MPS of P-DRA traffic, including network-wide stateful Gx/Rx correlation to support VoLTE.