MEC Location Management

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

Enabled - Always on

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.

21.12.2

Feature Description

Mobile Edge Computing (MEC) Support is used to bring application with low latency requirements and capabilities to the carrier’s network in order to explore a wide range of new use cases and applications. This feature enables selection of proper Edge User Plane nodes for MEC user sessions.

How It Works

Architecture

This section describes the MEC architecture.

Figure 1. MEC Architecture

Flows

This section describes the call flow procedures related to MEC support.

Whenever the user moves to idle mode, each PDN's default bearer is checked to see if the GW-U IP address matches the TAI table entries. If a mismatch is found, paging is initiated.

When the user connects back again either by TAU or Service Request based on the new tracking area from where the TAU or Service Request is received, each PDN's default bearer is checked to see if the GW-U IP address matches the TAI table entries. If mismatch is found and if the PDN and UE Usage is marked Re-connect in APN Profile, the PDNs are deleted with Re-Activation cause code.

Figure 2. Attach in TA-1, TAU from TA-2, IDLE Mode and SR in TA-2
Figure 3. Attach in TA-1, TAU from TA-2, IDLE Mode and TAU in TA-3

Configuring MEC Support

This section provides information on the CLI commands to configure MEC Support in the MME.

up-address

Use the following configuration to configure the addresses of User Plane Nodes Serving all TAIs in this object. 

configure   
   lte-policy   
      tai-mgmt-db  tai_mgmt_db_name 
         tai-mgmt-obj  tai_mgmt_obj_name 
            [ no ] up-address ( IP-ADDRESS | IP-ADDRESS/MASK }  
            end

NOTES:

  • no : Removes the addresses of User Plane Nodes Serving all TAIs in this object.

  • [ no ] up-address ( IP-ADDRESS | IP-ADDRESS/MASK } Configures the addresses of User Plane Nodes Serving all TAIs in this Object. IP-ADDRESS must be an IPV4 ##.##.##.## or IPV6 ####:####:####:####:####:####:####:####. Also supports :: notation IP-ADDRESS/MASK must be an IPV4 ##.##.##.##/x or IPV6 ####:####:####:####:####:####:####:####/x.

up-service-area-change

Use the following configuration to configure action for User-Plane Service Area Change for MME. 

configure   
   context  context_name 
      apn-profile  apn_profile_name  
         up-service-area-change disconnect-pdn [ ue-usage-type ]  ue_usage_type_values 
         end

NOTES:

  • up-service-area-change : Configures action for User-Plane Service Area Change for MME.

  • disconnect-pdn : Enables reselection of User Plane Node by PDN disconnection.

  • ue-usage-type ue_usage_type_values : Configures UE usage type for disconnecting PDN for UP service area. ue_usage_type_values must be an integer 1 through 255.

Monitoring and Troubleshooting

This section provides information regarding show commands available to monitor this feature.

Show Commands and Outputs

show mme-service statistics

The output of this command includes the following fields:

Paging Initiation for SIGNALING PDN RECONN Events:

  • Attempted

  • Success

  • Failures

    • Success at Last n eNB

    • Success at TAI List

    • Success at Last TAI

Bulk Statistics

The following statistics are added in support of the MEC Location Management feature:

Table 1. MME Schema

Bulk Statistics

Description
signalling-pdn-reconn-paging-init-events-attempted The total number of ECM Statistics-related Paging requests to UE, to reconnect PDN, that were attempted.
signalling-pdn-reconn-paging-init-events-success The total number of ECM Statistics-related Paging requests to UE, to reconnect PDN, that were successful.
signalling-pdn-reconn-paging-init-events-failures The total number of ECM Statistics-related Paging requests to UE, to reconnect PDN, that failed.
signalling-pdn-reconn-paging-last-enb-success The total number of ECM Statistics-related Paging requests to UE to reconnect PDN that succeeded at the last known eNodeB.
signalling-pdn-reconn-paging-last-tai-success The total number of ECM Statistics-related Paging requests to UE to reconnect PDN that succeeded at the last known Tracking Area Identifier.
signalling-pdn-reconn-paging-tai-list-success The total number of ECM Statistics-related Paging requests to UE to reconnect PDN that succeeded at an eNodeB in all TAIs present in the TAI list assigned to the UE.
Table 2. TAI Schema

Bulk Statistics

Description
tai-signalling-pdn-reconn-paging-init-events-attempted The total number of ECM Statistics-related Paging requests to UE, to reconnect PDN, that were attempted.
tai-signalling-pdn-reconn-paging-init-events-success The total number of ECM Statistics-related Paging requests to UE, to reconnect PDN, that were successful.
tai-signalling-pdn-reconn-paging-init-events-failures The total number of ECM Statistics-related Paging requests to UE, to reconnect PDN, that failed.
tai-signalling-pdn-reconn-paging-last-enb-success The total number of ECM Statistics-related Paging requests to UE to reconnect PDN that succeeded at the last known eNodeB.
tai-signalling-pdn-reconn-paging-last-tai-success The total number of ECM Statistics-related Paging requests to UE to reconnect PDN that succeeded at the last known Tracking Area Identifier.
tai-signalling-pdn-reconn-paging-tai-list-success The total number of ECM Statistics-related Paging requests to UE to reconnect PDN that succeeded at an eNodeB in all TAIs present in the TAI list assigned to the UE.