LTE-M RAT Indication Support

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

  • Statistics and Counters Reference

Revision History

Revision Details

Release

First introduced.

21.27

Feature Description

MME parses and stores the LTE-M RAT Indication IE in UE Capability Info Indication message. For Category M UEs, MME sends the RAT type of LTE-M (9) in the RAT type IE to S-GW. MME requests S-GW to pass the LTE-M RAT type to P-GW. The request to P-GW is based on the LTE-M RAT type indication configuration under call-control profile and mme-service. Based on the configuration, the LTEMPI ( LTE-M RAT type reporting to P-GW Indication ) bit in Indication IE is set in the create session request and modify bearer request messages to S-GW. The LTEMPI bit set to 1 indicates that the S-GW forwards the LTE-M RAT type to P-GW.

The Inter-MME changes the source and sends the LTE-M indication to the target MME. The source MME sends the indication message through the LTEMUI (LTE M UE Indication) bit in forward relocation request message and context response message over S10. The LTEMUI is set to 1 for Category M UEs. For other RAT types, the value is set to 0.

Configuration Support for LTE-M RAT Type Reporting to P-GW

Configuring LTEMPI Flag under Call Control Profile

Use the following configuration commands to configure the LTEMPI flag under call control profile:


configure 
   call-control-profile profile_name 
      lte-m-rat flag-LTEMPI { 1 | 0 } 
         [ no | default | remove ] lte-m-rat 
         end

NOTES:

  • lte-m-rat : Enables configuration for LTE-M Access type.

  • flag-LTEMPI : Configures LTE-M RAT Indication to S-GW to pass the LTE-M RAT type to the P-GW.

  • [ no | default | remove ] : Removes the configuration from call-control profile and fallback to the mme-service configuration.

Configuring LTEMPI Flag under MME Profile

Use the following configuration commands to configure the LTEMPI flag under MME profile:


configure 
   context context_name 
      mme-service service_name 
         lte-m-rat flag-LTEMPI { 0 | 1 } 
            [ no | default ] lte-m-rat 
            end

NOTES:

  • lte-m-rat : Enables configuration for LTE-M Access type.

  • flag-LTEMPI : Configures LTE-M RAT Indication to S-GW to pass the LTE-M RAT type to the P-GW.

  • [ no | default | remove ] : Removes the configuration from call-control profile and fallback to the mme-service configuration.

Monitoring and Troubleshooting

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

Show Command and Output

This section provides information about the show commands and outputs in support of this feature.

show mme-service { all | name <service name> }

The output of this command displays the following field:

Field

Description

LTE-M RAT Indication to S-GW to pass the LTE-M RAT type to the P-GW (Enabled/Disabled)

Displays the enabled or disabled status of the LTE-M RAT Indication to P-GW.

show call-control-profile full { all | name <ccp name> }

The output of this command displays the following field:

Field

Description

LTE-M RAT Indication to S-GW to pass the LTE-M RAT type to the P-GW (Enabled/Disabled)

Displays the enabled or disabled status of the LTE-M RAT Indication to P-GW.

show subscribers mme-only { all | full all | wf1 all } imsi <imsi_name>

The output of this command displays the following field:

Field

Description

Access Tech : (R) - LTE-M

Displays the Access Tech as 'R' (LTE-M) for Category M UEs.

show subscribers mme-service <service_name> imsi

The output of this command displays the following field:

Field

Description

Access Tech : (R) - LTE-M

Displays the Access Tech as 'R' (LTE-M) for Category M UEs.

Bulk Statistics

This section provides information on the bulk statistics variables for the MME schema:

Bulk Statistics Variables

Description

LTE-M Attached Calls

Displays the current total number of attached low power Subscribers operating in Category M.