P-GW Buffering Mechanism

Feature Summary and Revision History

Summary Data

Applicable Product(s) or Functional Area

P-GW

Applicable Platform(s)

  • ASR 5500

  • VPC - DI

  • VPC - SI

Feature Default

Disabled - Configuration Required

Related Changes in This Release

Not Applicable

Related Documentation

  • Command Line Interface Reference

  • P-GW Administration Guide

Revision History

Revision Details

Release

First introduced.

21.14

Feature Description

The P-GW can buffer a maximum of two policy (PCRF) messages when the Default-Bearer-QoS change is in pending state. With Presence Reporting Area (PRA) related call flows, two or more messages can be received when the Update Bearer Response (UBResp) is in pending state.

The P-GW Buffering Mechanism feature enables the P-GW to gracefully handle the RAR or CCA-U received from the PCRF when P-GW waits for the UBResp.

How It Works

Under Active Charging Service (ACS) mode, a CLI command - pending-buffer-size , is added to increase the buffer size. The PCRF messages are buffered until the P-GW receives a UBResp message while the Default-Bearer-QoS change is in pending state.

Configuring the P-GW Buffering Mechanism Feature

Use the following configuration to increase the buffer size for storing PCRF messages when the Default-Bearer-QoS change status is in pending. 

configure 
   active-charging service service_name 
      policy control def-bearer-qos-change pending-buffer-size buffer_size 
      end

NOTES:

  • def-bearer-qos-change : Sets the Default-Bearer-QoS change parameters.

  • pending-buffer-size buffer_size : Specifies the buffer size for storing the PCRF messages when Default-Bearer-QoS change is pending. The buffer_size is an integer ranging from 2 through 4.

    The minimum configured value is 2 and maximum is 4.

  • The no policy control def-bearer-qos-change configures the command with its default setting. Default = 2.

  • The default value suffices for most use-cases. However, higher values must be configured based on the use-case basis and by considering the memory usage.

  • The CLI command takes effect for new calls.