SRVCC Delete Bearer Request Handling

This chapter describes the following topics:

Feature Summary and Revision History

Summary Data

Applicable Product(s) or Functional Area

MME

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

  • MME Administration Guide

Revision History

Revision Details

Release

SRVCC Delete Bearer Request Handling introduced to release 21.12.

21.12.9

SRVCC Delete Bearer Request Handling introduced to release 21.11.

21.11.4

SRVCC Delete Bearer Request Handling introduced to release 21.5.

21.5.20

First introduced.

Pre 21.5

Feature Changes

With this release, MME can be configured to ignore the Delete Bearer Request (DBR) initiated from PGW while the Single Radio Voice Call Continuity (SRVCC) is ongoing, a new CLI command policy srvcc dbr ignore is introduced in the MME-Service configuration mode to enable the same.

Previous Behavior: The MME aborts the SRVCC when it receives P-GW initiated "Delete Bearer Request" for Voice bearer (QCI 1).

New Behavior: The MME processes the "Delete Bearer Request" initiated from P-GW while the SRVCC is ongoing. MME will not abort the SRVCC procedure.

Command Changes

Configuring DBR Handling while SRVCC is Ongoing

Use the below configuration for handling the Delete Bearer Request (DBR) from P-GW while SRVCC is Ongoing.

configure 
   context context_name 
      mme-service service_name  
          [ no ]policy srvcc dbr ignore 
          default policy srvcc dbr 
          end

Notes:

  • no Returns the command to its default behavior, where the MME abort the SRVCC when it receives P-GW initiated "Delete Bearer Request" for Voice bearer (QCI 1).

  • The default Returns the command to its default behavior, where the MME abort the SRVCC when it receives P-GW initiated "Delete Bearer Request" for Voice bearer (QCI 1).

  • The dbr Configures the behavior to handle "Delete-Bearer-Request" message.

  • The ignore Ignores the DBR (Voice Bearer) initiated from P-GW while SRVCC is ongoing.