ERAB Setup Retry 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

Default Setting

Disabled - Configuration Required

Related Changes in This Release

Not Applicable

Related Documentation

  • Command Line Interface Reference

  • MME Administration Guide

  • Statistics and Counters Reference

Revision History

Revision Details

Release

Retry ERAB Setup Request Support added

21.5.26

Retry ERAB Setup Request Support added.

21.11.13

Retry ERAB Setup Request Support added.

12.12.15

Retry ERAB Setup Request Support added.

21.15

Retry ERAB Setup Request Support added.

21.14.3

First introduced.

21.14

Feature Changes

MME delays re-sending the "ERAB Setup Request" message if failure response is received with cause "Interaction with other procedure."

Previous Behavior: The MME re-transmits the "E-RAB Setup Request" immediately on the reception of "E-RAB Setup Response" with cause "interaction with other procedure."

New Behavior: MME will start Timer (Tm) after the reception of "E-RAB Setup Response" with cause "Interaction with other procedure." Once the timer expires, MME re-transmits the "E-RAB Setup Request." MME supports the maximum retry count. This behavior is CLI controlled.

Command Changes

erab-setup-rsp-fail retry-timer

Use the following configuration to configure the ERAB Setup retry handling:

configure 
   context context_name 
      mme-service service_name 
         policy erab-setup-rsp-fail retry-timer retry_timer  max-retries max_retries  
         { default | no } policy erab-setup-rsp-fail retry-timer 
         end

NOTES:

  • no Disables the retry timer mechanism.

  • default Restores the default value to existing behavior by disabling the retry timer mechanism.

  • policy Specifies the user-defined policies like idle mode detach behavior and so on.

  • erab-setup-rsp-fail Sets the handling for ERAB-SETUP-RESPONSE failure message.

  • retry-timer retry_timer Configures the retry timer for ERAB Setup Procedure. retry_timer must be an integer value in the range of 1-15.

  • max-retries max_retries Configures the maximum retry limit for ERAB Setup Procedure. max_retries must be an integer value in the range of 1-10.

Performance Indicator Changes

show mme-service name <mme_svc_name>

The output of this command includes the following fields:

  • Policy ERAB Setup Procedure

    • ERAB Setup retry timer - Retry timer for ERAB Setup Procedure

    • ERAB Setup maximum retry limit - Maximum retry limit for ERAB Setup Procedure


Important

ERAB Setup Retry Handling is applicable only for Dedicated Bearer Creation.