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The P-GW Buffering Optimization enables the P-GW to handle the Presence Reporting Area (PRA) messages efficiently. When two or more PRAs are received, while UBResp is still pending, there are chances that P-GW buffer queue can become full or even a message drop can happen. This enhancement enables the PRA response from Policy and Charging Rules Function (PCRF) to be handled efficiently as the chances of message drop is less.

When a new message arrives, the P-GW merges the message with the existing similar type of message in the queue. This allows the P-GW to process similar type of messages at the same time without increasing the queue size and reducing the message drop ratio. When messages are read from the queue, the Gx Rule Level Attribute -value pairs (AVPs) defined actions are triggered. The Rule Level AVPs validity is not checked when messages are buffered.

The P-GW Buffering Optimization feature is related to P-GW Buffering Mechanism functionality. For details, see the P-GW Buffering Mechanism chapter in the P-GW Administration Guide.

Under Active Charging Service (ACS) mode, a CLI command - optimze-update is enabled or disbaled to enable or disable the buffering mechanism.

Use the following configuration to enable or disable the P-GW buffering optimization to process the similar type of messages in the queue.

configure 
            active-charging service service_name 
              [ no ] policy control optimze-update pra-change 
          end 

NOTES:

• optimize-update : Enables the optimization for multiple policies received from PCRF, when the earlier response is pending. Default is Disabled.

• no : Disables the optimization for multiple policies.

• pra-change: Enables policy optimization only during the Presence Reporting Area (PRA) change.

This section provides information on how to monitor and troubleshoot using show commands to support this feature.