Key PCA configurable components include:
- PCA Binding Region Place Association consisting of all PCA Sites
- PCA Mated Sites Place Associations, each consisting of redundant PCA Sites
- Policy and Charging Session Resource Domains - one per PCA Mated Sites Place Association consisting of all session SBR server groups at the mated sites.
- Policy Binding Resource Domain - one per PCA Binding Region Place Association consisting of all binding SBR server groups.
- Policy and Charging DRA Resource Domains - one per PCA Mated Sites Place Association consisting of all DSR (multi-active cluster) server groups at the mated sites.
- SBR Server Groups - enough to handle the load in stack events per second.
- Diameter Signaling Router (multi-active cluster) Server Groups - one per PCA DRA Site.
For multiple mated pair/triplet deployments, there are two different configurations for mated pairs:
- One mated pair/triplet that hosts the PCA Binding database and an instance of the Session database
- N mated pairs/triplets that each host only an instance of the Session database
Figure 1 illustrates two PCA DSR Sites configured as a Mated Pair:
- This Mated Pair hosts the PCA Binding database and an instance of the Session database.
- The Binding database is represented by a Binding Resource Domain consisting of a number of SBR Server Groups.
- The Session database instance is represented by a Session Resource Domain consisting of a number of SBR Server Groups.
- Each SBR Server Group consists of 3 servers using the Active/Standby/Spare redundancy model, allowing for Site redundancy.
- The number of SBR Server Groups necessary to host the binding or session database will be determined by the application provider prior to feature activation based on expected policy signaling needs.
- Each Site has an SOAM Server Group consisting of 3 servers using the Active/Standby/Spare redundancy model, allowing for Site redundancy.
- The PCA network has an NOAM Server Group consisting of 2 servers using the Active/Standby redundancy model. If NOAM site redundancy is desired, another pair of Disaster Recovery NOAM servers can be deployed at a different Site.
- Each Site has a number of DA-MP servers sufficient to carry the desired Diameter signaling load.
- Each Site has two pairs of IPFE blades – one for use by Policy Clients and one for use by PCRFs. (IPFE is not required.)
Example PCA Mated Pair - Hosting Binding SBRs![](example_pca_mated_pair_hosting_binding_database.png)
Figure 2 illustrates a possible configuration for additional mated pairs that do not host the Binding database:
- Each subsequent mated pair deployed after the set of mated pairs hosting the Binding database will host only an instance of the Session database (no Binding database).
- The number of DA-MPs can vary depending on the expected Diameter signaling load.
Example PCA Mated Pair - Not Hosting Binding Policy SBRs![](example_pca_mated_pair_no_binding_database.png)
Figure 3 illustrates example relationships between PCA DSR Sites and Policy Clients and PCRFs:
Policy Client, PCRF, and Site Relationships![](policy_client_pcrf_site_relationships_pca.png)