4G Network Upgrade on Gx Interface

Feature Summary and Revision History

Summary Data

Applicable Product(s) or Functional Area

  • GGSN

  • P-GW

  • SAEGW

Applicable Platform(s)

All

Feature Default

Disabled - Configuration Required

Related Changes in This Release

Not Applicable

Related Documentation

  • Command Line Interface Reference

  • GGSN Administration Guide

  • P-GW Administration Guide

  • SAEGW Administration Guide

Revision History

Revision Details

Release

First introduced.

21.23

Feature Description

Diameter Overload Indication Conveyance (DOIC) specification passes overload information during transfer of messages to P-GW server. When there is an overload, there is no specific way to choose the messages that needs to be throttled or discarded which could result in excess traffic in the network. To reduce traffic in the network, Diameter Routing Message Priority (DRMP) is newly introduced. Using DRMP, you can set the priority for messages, based on which messages are throttled or discarded.

DRMP messages can be sent in CCR message and RAA in Gx interface only. The value to be sent in AVP can be configured using the configuration commands for below messages:

Message

Description

CCR -Initial

The CCR message is sent during connection creation.

CCR- Update

The CCR message that is sent during CCR update.

CCR-Termination

The CCR message that is sent during connection deletion.

RAA

ReAuth Answer message that is sent in response to the ReAuth Request from the PCRF.

Note

If the DRMP feature is not configured, then no priority is set in the CCR/RAA messages. If DRMP is set without any priority (0 to 15), then the default priority of 10 will be set.

Configuring DRMP Priority Values

Use the following configuration commands to set the priority DRMP value:


configure 
     context context_name 
        ims-auth-service ims_auth_service_name 
           policy-control  
              [ no ]diameter{ drmp [ ccr-i drmp_value| ccr-t drmp_value| ccr-u drmp_value |rra  drmp_value]} 
   end

Note

If the DRMP feature is not configured, then no priority is set in the CCR/RAA messages. If DRMP is set without any priority (0 to 15), then the default priority of 10 will be set.

Origination Time Stamp and Maximum Wait Time

Origination-Time-Stamp

Origination-Time-Stamp(1536) is a standard AVP that is added in the CCR-I messages originating from P-GW. This AVP indicates the time (NTP synced) when the request message is sent to PCRF Server from P-GW. The Origination-Time-Stamp(1536)indicates the UTC time at which the originating entity initiated the request and is encoded in the 64-bit NTP timestamp format and here, the binary encoding of the integer part is in the first 32 bits and binary encoding of the fraction part is in the last 32 bits.

Maximum-Wait-time

Maximum-Wait-time is a standard AVP (code 1537) of type of Unsigned 32. If message is received and takes a long time to process then the message is dropped by the PCRF and the CCA-I will not be sent by the PCRF. This AVP is used along with origination-timestamp AVP. Max-Wait-time (7103) is the non-standard AVP used in CCR-I messages towards Diameter Gx and it is used along with the Maximum-Wait-Time (1537) standard AVP.

Table 1. Existing AVP's

AVP Name

AVP ID

Origination-Timestamp

7102

Max-Wait-Time

7103
Table 2. New AVP's

AVP Name

AVP ID

Origination-Time-Stamp

1536

Maximum-Wait-Time

1537

Note

Both new and existing AVPs are supported in this release.

Monitoring and Trouble Shooting

This section provides information on the show commands and bulk statistics.

Show Command and Output

show ims-authorization service name <service_name>

The following new fields are added to the output of this command:

  • Diameter Policy Control

    • DRMP: CCR-I CCR-U CCR-T RAA

show ims-authorization policy-control statistics

The following new fields are added to the output of this command:

  • DPCA Experimental Result Code Stats

    • Late Overlapping Request

    • Time Out Request

show session disconnect-reasons

The following new fields are added to the output of this command:

  • Disconnect Reason

    • newer-session-detected

    • late-overlapping-request

Bulk Statistics

The following bulk statistics are newly added:

Bulk Statistics

Description

dpca-imsa-exp-late-overlapping-request

Displays the total number of times the diameter experimental result code DIAMETER_ERROR_LATE_OVERLAPPING_REQUEST(5453) is received in CCA message.

dpca-imsa-exp-timed-out-request

Displays the total number of times the diameter experimental result code DIAMETER_ERROR_TIME_OUT_REQUEST(5454) is received in CCA message.