# MME Changes in Release 14.0

This chapter identifies features and functionality added to, modified for, or deprecated from 14.0 MME software releases.
Topics covered in this chapter are:

- Omissions and Corrections
- MME Feature Changes as of November 7, 2012
- MME Configuration Management Changes as of November 7, 2012
- MME Performance Management Changes as of November 7, 2012
- MME Security Management Changes as of November 7, 2012
- MME Feature Changes as of September 28, 2012
- MME Configuration Management Changes as of September 28, 2012
- MME Performance Management Changes as of September 28, 2012
- MME Security Management Changes as of September 28, 2012
- MME Feature Changes as of July 31, 2012
- MME Configuration Management Changes as of July 31, 2012
- MME Performance Management Changes as of July 31, 2012
- MME Security Management Changes as of July 31, 2012
- MME Feature Changes as of June 29, 2012
- MME Configuration Management Changes as of June 29, 2012
- MME Performance Management Changes as of June 29, 2012
- MME Security Management Changes as of June 29, 2012

IMPORTANT:

Enhancements to Diameter, GTPP, and RADIUS in release 14.0 are located in the Accounting Management Changes chapter.

Enhancements to SNMP MIB in release 14.0 are located in the SNMP MIB Changes chapter.

Enhancements to Web Element Manager (WEM) in release 14.0 are located in the Web Element Manager Changes chapter.

Omissions and Corrections

The following lists of items link to changes found in a previous code drop that were omitted from the Release Change Reference or to technical corrections made to previously published content.

Omissions from/Corrections to September 28, 2012 Content

- EIR Endpoint Behavior Change
- Attach/TAU Attach Reject Behavior Change
- Congestion Overload Behavior Change
- APN OI Used in Create Session Request Behavior Change
- SGs Context Allocation Failure Behavior Change
- S1-HO During Attach Procedure Behavior Change

Omissions from/Corrections to June 29, 2012 Content

- Extended RNC-ID IE Support
- show sgs-service vlr-status full

MME Feature Changes as of November 7, 2012

This section provides information on MME feature changes in release 14.0.

IMPORTANT:

For more information regarding features in this section, refer to the MME Administration Guide for this release.

New MME Features

This section identifies new MME features available in release 14.0.

None for this release.

Modified MME Features

This section identifies MME features modified in release 14.0 and contains two types of modifications: enhancements and behavior changes. Feature enhancements are modifications based on customer change requests. Feature behavior changes are modifications based on software error corrections (bug fixes) that result in a change in the behavior of the feature.

SCTP Association Retry Interval

Previous Behavior: The SCTP association was retried indefinitely every 10 seconds after a failure until the service or VLR was removed or the association comes up.

New Behavior: The SCTP association is still retried indefinitely after a failure until the service or VLR is removed or the association comes up. The SCTP association retry interval is now a value between 10 and 30 second and is a calculated product of the SCTP Initial Retransmission Timeout value and the SCTP Max Init re-transmissions. If the calculated product is beyond the 10 to 30 second range, it is bound to the range. If SCTP Templates are not configured, the retry interval is 10 seconds.

Default Cause Code When VLR Down

Previous Behavior: Combined TAU/Accept used to send the CS_DOMAIN_NOT_AVAILBALE (#12) NAS cause code when a VLR was down.

New Behavior: Combined TAU/Accept now sends the MSC_TEMPORARILY_NOT_REACHABLE (#10) NAS cause code when a VLR is down.

MME Configuration Management Changes as of November 7, 2012

This section provides information on MME configuration command changes in release 14.0.

None for this release.

MME Performance Management Changes as of November 7, 2012

This section provides information on MME performance management changes in release 14.0.

IMPORTANT:

For more information regarding bulk statistics in this section, refer to the Statistics and Counters Reference for this release.

For more information regarding commands in this section, refer to the Command Line Interface Reference for this release.

New MME Bulk Statistics

This section identifies new MME bulk statistics available in release 14.0.

None for this release.

Modified MME Bulk Statistics

This section identifies MME bulk statistics modified in release 14.0.

None for this release.

Deprecated MME Bulk Statistics

This section identifies deprecated MME bulk statistics that are no longer supported in release 14.0.

None for this release.

New MME Performance Commands

This section identifies new MME performance commands available in release 14.0.

None for this release.

Modified MME Performance Commands

This section identifies MME performance commands modified in release 14.0.

show crypto statistics

The following new field has been added to track the total errors due to authentication failures during IKE_AUTH exchanges.

- Total Auth Failures

Exec Mode

    show crypto statistics

Deprecated MME Performance Commands

This section identifies deprecated MME performance commands that are no longer supported in release 14.0.

None for this release.

MME Security Management Changes as of November 7, 2012

This section provides information on MME security management changes in release 14.0.

None for this release.

MME Feature Changes as of September 28, 2012

This section provides information on MME feature changes in release 14.0.

IMPORTANT:

For more information regarding features in this section, refer to the MME Administration Guide for this release.

New MME Features

This section identifies new MME features available in release 14.0.

Location Services

LoCation Services (LCS) is a 3GPP standards-compliant feature that enables the system MME to collect and use or share location (geographical position) information for connected UEs in support of a variety of location services.

Refer to the Location Services chapter of the MME Administration Guide for more information about this feature.

Modified MME Features

This section identifies MME features modified in release 14.0 and contains two types of modifications: enhancements and behavior changes. Feature enhancements are modifications based on customer change requests. Feature behavior changes are modifications based on software error corrections (bug fixes) that result in a change in the behavior of the feature.

EIR Endpoint Behavior Change

Omitted Content: The following behavior changed in the September 28, 2012 release, but was omitted from this document until now:

Previous Behavior: The MME did not support association of the same EIR endpoint name to two different mme-hss-services.

New Behavior: The same EIR endpoint name can now be associated with two different HSS endpoints.

Attach/TAU Attach Reject Behavior Change

Omitted Content: The following behavior changed in the September 28, 2012 release, but was omitted from this document until now:

Previous Behavior: For ATTACH/TAU procedures, if the ATTACH REQUEST passes integrity checks, but an IMSI mismatch with SGSN occurs, the MME rejects the call with cause code #3: Illegal UE.

New Behavior: For ATTACH procedures, if the ATTACH REQUEST passes integrity checks, but an IMSI mismatch with SGSN occurs, then MME assumes that MME mapping is correct and proceeds with authentication with that IMSI. For TAU ATTACH procedures, the cause code for reject has been changed to #9: UE identity cannot be derived by the network.

Congestion Overload Behavior Change

Omitted Content: The following behavior changed in the September 28, 2012 release, but was omitted from this document until now:

Previous Behavior: With a congestion control profile set to reject combined-attaches at a specific threshold, calls were dropped without a reject cause code.

New Behavior: The NAS reject cause code due to congestion for attach-reject, TAU-reject, and service-reject call events is now displayed as CONGESTION (#16).

APN OI Used in Create Session Request Behavior Change

Omitted Content: The following behavior changed in the September 28, 2012 release, but was omitted from this document until now:

Previous Behavior: When a roamer attached to a MME, the MME always predicted the visitor/IMSIs MNC to be 3 digits or 2 digits based on the MNC length of MME PLMN and thereby did not accurately calculate the IMSIs MNC. This could result in an incorrect MNC in the APN OI sent in the Create Session Request/Attach Accept message.

New Behavior: A table is now maintained internally by the MME for PLMNs with valid 3 digit MNCs as per Telecommunication standards. All the MNCs which are not present in this table will be considered as 2 digit MNCs.

SGs Context Allocation Failure Behavior Change

Omitted Content: The following behavior changed in the September 28, 2012 release, but was omitted from this document until now:

Previous Behavior: Numerous errors were reported per subscriber when the MME failed to allocate an SGs context.

New Behavior: The “Could not register UE Context with SGS” error message is no longer reported under these circumstances.

The “Failed to allocate SGS context” error message has been downgraded from ERROR to UNUSUAL.

S1-HO During Attach Procedure Behavior Change

Omitted Content: The following behavior changed in the September 28, 2012 release, but was omitted from this document until now:

Previous Behavior: The MME did not support S1-HO during Attach Procedure.

New Behavior: S1-HO is now supported during initial attach on the condition that the S1-HO is initiated to the same TAC if attach complete has not yet been received. Also, any pending dedicated bearer requests will be rejected during this procedure.

If the attach complete was not yet received, the UE cannot change the TAC.

Any dedicated bearer procedures started during S1-HO during initial attach are aborted.

Indirect forwarding for user-data is not supported during this timeframe.

Error Handling During S10 Handover Behavior Change

During an S10 handover, when the source MME sends a DNS query for the target MME, and the address in the DNS response is the same as that of an S-GW with which the source MME has already communicated, the source MME now rejects the handover with a Handover Preparation Failure message.

VLR Offload Behavior Change

New Behavior: When Initial UE message is received for a subscriber that has already been offloaded, the procedure will be completed and UE will not be offloaded again.

Previous Behavior: In previous releases, when Initial UE message is received for a subscriber that has already been offloaded, the UE would be offloaded again after completing the procedure.

Zone Code Roaming Restrictions Behavior Change

To minimize HSS signaling, the MME has changed when zone code restrictions are applied.

New Behavior: Locally configured zone code restrictions are applied before attempting to authenticate the UE.

Previous Behavior: The zone codes provided by the HSS is given preference over the locally configured values. As a result, the restrictions are applied after an Update Location Answer (ULA) is received from the HSS even if there is no HSS-based restrictions implemented.

MME Configuration Management Changes as of September 28, 2012

This section provides information on MME configuration command changes in release 14.0.

IMPORTANT:

For more information regarding commands in this section, refer to the Command Line Interface Reference for this release.

New MME Configuration Commands

This section identifies new MME commands available in release 14.0.

associate

This command associates or disassociates supportive interfaces or services with a Location service. LoCation Services (LCS) are used to determine the geographic location of a UE.

Location Service Configuration Mode

    associate { diameter { dictionary
    standard | endpoint }

location-service

This command creates a Location service or configures an existing Location service and enters the Location Service Configuration Mode. LoCation Services (LCS) are used to determine the geographic location of a UE.

Context Configuration Mode

    [ no ] location-service service_name [ -noconfirm ]

sgs-cause-code-mapping

This command configures the EMM reject cause code to send to a UE when an SGs cause code is received.

Call Control Profile Configuration Mode

    sgs-cause-code-mapping  sgs_cause_code emm-cause-code   emm_cause_code

    remove sgs-cause-code-mapping sgs-cause

Modified MME Configuration Commands

This section identifies MME commands modified in release 14.0.

associate

This command has been updated with a location-service keyword to associate a location service with this MME service. Only one location service should be associated with an MME Service.

MME Service Configuration Mode

    associate { { egtp-service egtp_svc_name | egtp-sv-service egtp_sv_svc_name | hss-peer-service hss_svc_name | location-service location_svc_name | lte-emergency-profile profile_name | network-global-mme-id-mgmt-db | sctp-param-template template_name | sgs-service sgs_svc_name | sgtpc-service sgtpc_svc_name } [ context ctx_name ] | subscriber-map map_name | tai-mgmt-db database_name }

    no associate { egtp-service | egtp-sv-service | hss-peer-service | location-service | lte-emergency-profile | network-global-mme-id-mgmt-db | sctp-param-template | sgs-service | sgtpc-service | subscriber-map | tai-mgmt-db }

local-cause-code-mapping

This command has been enhanced to enable configuration of cause codes sent to the UE when there is an APN mismatch, when the VLR is down (either not configured, or the link is not up), or when the VLR is not reachable (no response from VLR).

These mappings are applied at the call control profile level, with the exception of apn-mismatch, which can also be applied at the MME service level for cases where a call control profile could not be applied to a call.

An EMM cause code can be set for each reject scenario using the emm-cause-code keyword.

Call Control Profile Configuration Mode

    local-cause-code-mapping
    apn-mismatch emm-cause-code { eps-service-not-allowed-in-this-plmn | esm-failure
    esm-cause-code unknown-apn | no-suitable-cell-in-tracking-area | plmn-not-allowed | roaming-not-allowed-in-this-tracking-area | tracking-area-not-allowed }

    local-cause-code-mapping
    vlr-down emm-cause-code { congestion | cs-domain-unavailable | imsi-unknown-in-hlr | msc-temp-unreachable | network-failure }

    local-cause-code-mapping
    vlr-unreachable emm-cause-code { congestion | cs-domain-unavailable | imsi-unknown-in-hlr | msc-temp-unreachable | network-failure }

MME Service Configuration Mode

    local-cause-code-mapping
    apn-mismatch emm-cause-code { eps-service-not-allowed-in-this-plmn | esm-failure
    esm-cause-code unknown-apn | no-suitable-cell-in-tracking-area | plmn-not-allowed | roaming-not-allowed-in-this-tracking-area | tracking-area-not-allowed }

Deprecated MME Configuration Commands

This section identifies deprecated MME commands that are no longer supported in release 14.0.

None for this release.

MME Performance Management Changes as of September 28, 2012

This section provides information on MME performance management changes in release 14.0.

IMPORTANT:

For more information regarding bulk statistics in this section, refer to the Statistics and Counters Reference for this release.

For more information regarding commands in this section, refer to the Command Line Interface Reference for this release.

New MME Bulk Statistics

This section identifies new MME bulk statistics available in release 14.0.

MME Schema

- ded_brr-deactivation-mme-attempted
- ded_brr-deactivation-mme-success
- ded_brr-deactivation-mme-failures
- ded_brr-deactivation-pgw-attempted
- ded_brr-deactivation-pgw-success
- ded_brr-deactivation-pgw-failures
- ded_brr-deactivation-ue-attempted
- ded_brr-deactivation-ue-success
- ded_brr-deactivation-ue-failures
- dflt_brr-deactivation-mme-attempted
- dflt_brr-deactivation-mme-success
- dflt_brr-deactivation-mme-failures
- dflt_brr-deactivation-pgw-attempted
- dflt_brr-deactivation-pgw-success
- dflt_brr-deactivation-pgw-failures
- dflt_brr-deactivation-ue-attempted
- dflt_brr-deactivation-ue-success
- dflt_brr-deactivation-ue-failures
- emm-msgtx-attach-accept-imsi-unknown
- emm-msgtx-attach-accept-no-msc
- emm-msgtx-attach-accept-nw-fail
- emm-msgtx-attach-accept-congestion
- emm-msgtx-attach-accept-no-cs
- emm-msgtx-tau-accept-imsi-unknown
- emm-msgtx-tau-accept-no-msc
- emm-msgtx-tau-accept-nw-fail
- emm-msgtx-tau-accept-congestion
- emm-msgtx-tau-accept-no-cs

Modified MME Bulk Statistics

This section identifies MME bulk statistics modified in release 14.0.

None for this release.

Deprecated MME Bulk Statistics

This section identifies deprecated MME bulk statistics that are no longer supported in release 14.0.

MME Schema

- dedi-brr-activation-ue-attempted
- dedi-brr-activation-ue-success
- dedi-brr-activation-ue-failures
- brr-deactivation-mme-attempted
- brr-deactivation-mme-success
- brr-deactivation-mme-failures
- brr-deactivation-pgw-attempted
- brr-deactivation-pgw-success
- brr-deactivation-pgw-failures
- brr-deactivation-ue-attempted
- brr-deactivation-ue-success
- brr-deactivation-ue-failures

New MME Performance Commands

This section identifies new MME performance commands available in release 14.0.

show location-service

The following commands show configuration information and statistics relating to the LoCation Services (LCS) feature.

Exec Mode

    show location-service
    service all

    show location-service
    statistics all

show mme-service id summary

This command displays the current number of MME-assigned and eNodeB-assigned S1AP session IDs.

Exec Mode

    show mme-service id
    summary

Modified MME Performance Commands

This section identifies MME performance commands modified in release 14.0.

monitor subscriber

The following output fields now show “n/a” (Not applicable) instead of being blank when issuing this command.

- IMEI
- Username

Exec Mode

    monitor subscriber

show mme-service all

The following field has been added to show the name of the location service to which the MME service has been associated.

- Location Service

Exec Mode

    show mme-service all

show mme-service db record imsi

A new Trace Data group of fields displays trace data if it is provided as part of the UE subscription data from the HSS. For information about this trace data provided, refer to section 5 of 3GPP TS 32.422.

Exec Mode

    show mme-service db
    record imsi

show mme-service enodeb-association

A new eNodeB Type field has been added to display the type of eNodeB, either Home or Macro, as reported by the eNodeB.

Exec Mode

    show mme-service enodeb-association
    full

A path-info keyword has been added to display S1 path association information. When issued, the following information is displayed for all eNodeBs associated with MME services on the system:

- Path Source IP Address
- Path Destination IP Address
- Path State

Exec Mode

    show mme-service enodeb-association
    path-info

show mme-service statistics

The following new Total EMM Control Messages - Sent - Attach Accept: output fields have been added to this command:

- IMSI Unknown in HSS
- MSC Unreachable
- Network Failure
- CS Domain Not Available
- Congestion

The following new Total EMM Control Messages - Sent - TAU Accept: output fields have been added to this command:

- IMSI Unknown in HSS
- MSC Unreachable
- Network Failure
- CS Domain Not Available
- Congestion

The output of this command has been updated to show separate dedicated and default bearer deactivation statistics as follows:

- MME Initiated Dedicated Bearer Deactivations
- PGW/SGW Initiated Dedicated Bearer Deactivations
- UE Initiated Dedicated Bearer Deactivations
- MME Initiated Default Bearer Deactivations
- PGW/SGW Initiated Default Bearer Deactivations
- UE Initiated Default Bearer Deactivations

The following output fields have been deprecated from this command:

- MME Initiated Bearer Deactivations
- PGW/SGW Initiated Bearer Deactivations
- UE Initiated Bearer Deactivations

Exec Mode

    show mme-service statistics

show sgs-service vlr-status full

The following field has been updated to show the path status information for each association, indicating either UP or DOWN:

- VLR IP Address

Exec Mode

    show sgs-service vlr-status
    full

Deprecated MME Performance Commands

This section identifies deprecated MME performance commands that are no longer supported in release 14.0.

None for this release.

MME Security Management Changes as of September 28, 2012

This section provides information on MME security management changes in release 14.0.

None for this release.

MME Feature Changes as of July 31, 2012

This section provides information on MME feature changes in release 14.0.

None for this release.

MME Configuration Management Changes as of July 31, 2012

This section provides information on MME configuration command changes in release 14.0.

None for this release.

MME Performance Management Changes as of July 31, 2012

This section provides information on MME performance management changes in release 14.0.

IMPORTANT:

For more information regarding bulk statistics in this section, refer to the Statistics and Counters Reference for this release.

For more information regarding commands in this section, refer to the Command Line Interface Reference for this release.

New MME Bulk Statistics

This section identifies new MME bulk statistics available in release 14.0.

eGTP-C Schema

The following eGTP-C Schema bulk statistics have been introduced in this release:

- tun-sent-stoppagingind
- tun-recv-stoppagingind

Modified MME Bulk Statistics

This section identifies MME bulk statistics modified in release 14.0.

None for this release.

Deprecated MME Bulk Statistics

This section identifies deprecated MME bulk statistics that are no longer supported in release 14.0.

None for this release.

New MME Performance Commands

This section identifies new MME performance commands in release 14.0.

None for this release.

Modified MME Performance Commands

This section identifies MME performance commands modified in release 14.0.

show congestion-control statistics mme full

The output of this command to include statistics for the emergency events and voice calls that were excluded from the congestion control policy:

- Excluded Emergency Events
- Excluded Voice Events

Exec Mode

    show congestion-control
    statistics mme full

Deprecated MME Performance Commands

This section identifies deprecated MME performance commands that are no longer supported in release 14.0.

None for this release.

MME Security Management Changes as of July 31, 2012

This section provides information on MME security management changes in release 14.0.

None for this release.

MME Feature Changes as of June 29, 2012

This section provides information on MME feature changes in release 14.0.

IMPORTANT:

For more information regarding features in this section, refer to the MME Administration Guide for this release.

New MME Features

This section identifies new MME features available in release 14.0.

APN Override

This release provides enhancements to enable operators to override the Access Point Name (APN) requested by the UE. The functionality to provide configurable remapping provides the operator flexible options with APN handling locally rather than requiring changes in the external systems. Refer to the APN Override chapter of the MME Administration Guide for more information about this feature.

Closed Subscriber Groups

The MME now provides support for Closed Subscriber Groups (CSG). This enables the MME to provide access control and mobility management for subscribers who are permitted to access one or more CSG cells of the PLMN as a member of the CSG for a Home eNodeB (HeNB). Refer to the Closed Subscriber Group chapter of the MME Administration Guide for more information about this feature.

Configurable Target RNC-ID to Target eNodeB-ID Mapping for Inter-RAT Handovers

The MME now provides the ability to configure how the fields in the Target RNC-ID are mapped to the Target eNodeB fields during a UMTS to E-UTRAN relocation.

Refer to the mapping command in the MME Service Configuration Mode in the Command Line Interface Reference for more information.

DNS Gateway Selection - Topology-Match and Weight

In previous releases, MME supported gateway selection based on topological closeness and a round-robin method of weight distribution if equally viable pairs of gateways were selected. In this release, the MME can now support statistical distribution of calls to multiple S-GW/P-GW nodes (in accordance with 3GPP TS 29.303) when multiple records in a topological/co-location match have the same value for the ‘order’ field.

The preferences/weights of the P-GW/S-GW from the NAPTR/SRV resource records are used for the load balancing as configured using the gw-selection command in the call-control-profile mode.

This provides a method of distributing calls according to the capacity available on each gateway.

Dual Stack Handover Support for S3/S4 SGSN

The MME now supports inter-RAT handovers between the MME and S3/S4 SGSN for dual stack (dual address) IP4v/IPv6 PDN connections.

Heuristic and Intelligent Paging

This release provides enhancements to enable operators to minimize the paging load in the EUTRAN network by specifying different paging profiles for different types of traffic. The pace, volume, and type of paging requests sent to eNodeBs can now be controlled. Refer to the Heuristic and Intelligent Paging chapter of the MME Administration Guide for more information about this feature.

Idle-mode Signaling Reduction

Idle-mode Signaling Reduction (ISR) allows a UE to be registered on (and roam between) E-UTRAN and UTRAN/GERAN networks while reducing the frequency of TAU and RAU procedures and overall signaling.

Refer to the Idle-mode Signaling Reduction chapter of the MME Administration Guide for more information about this feature.

Interworking Enhancements

S4-SGSN Handover Support

MME to 2G SGSN (GERAN) Handovers: The MME now supports E-UTRAN-to-GERAN (4G MME to 2G SGSN) handovers over the S3 interface.

2G SGSN (GERAN) to MME Handovers: The MME now supports GERAN-to-E-UTRAN (2G SGSN to 4G MME) handovers over the S3 interface.

MME to 2G SGSN (GERAN) PS Handovers: The MME now supports E-UTRAN-to-GERAN (4G MME to 2G SGSN) PS handovers over the Gn/Gp interface.

2G SGSN (GERAN) to MME PS Handovers: The MME now supports GERAN-to-E-UTRAN (2G SGSN to 4G MME) PS handovers over the Gn/Gp interface.

The MME now supports PS handover-related SGTPC Information Elements during E-UTRAN to/from GERAN PS Handovers.

Relocate UE to Specific MME

The MME now supports the ability to release a UE, and cause it to attach to another particular MME within the pool. Once an IMSI is configured to be relocated to a different MME, that configuration shall exist till it is removed. The MME allows for up to 20 such IMSI to be configured. The UE must be in the EMM-REGISTERED or ECM-CONNECTED state in order to be relocated.

If the UE is in ECM-CONNECTED state, the MME uses the GUTI relocation command to change the GUTI to a configured GUTI. Once confirmation is received from the UE, the UE is detached with detach type “re-attach required”. If the GUTI relocation procedure fails, the UE is still detached from the network.

PDN Type Control

PDN Type Control enables the MME to override the requested Packet Data Network (PDN) type based on the inbound roamer PLMN, and assign the UE to an IPv4 only or IPv6 only PDN.

If a UE requests an IPv4v6 PDN, it can be downgraded to an IPv4- or IPv6-only address. The MME signals the appropriate cause to the UE to account for the PDN type change.

PDN Type Control is configured in a call control profile that is applied via an operator policy. Refer to the pdn-type-override command in the Call Control Profile Configuration Mode chapter of the Command Line Interface Reference for more information.

SGs Architecture Enhancements

In order to realize the full potential of the current architecture in terms of capacity and robustness (redundancy), the MME can now establish multiple logical associations towards the same MSC/VLR.

Each individual VLR can now be defined with up to 10 separate associations to a single MSS pool. Each of these associations support SCTP multi-homing by defining a primary/secondary IP address. Application layer messages are transmitted in a balanced fashion across available associations for a particular VLR. If a complete failure of the underlying SCTP layer for a given association (for example, both SCTP paths in a multi-homed configuration) occurs, the VLR association is removed as a candidate for application message transmission until it recovers. A given MSC (VLR) will remain available as long as at least one related association remains available.

To implement this change, each vlr defined using the vlr command in the MME SGs Service Mode can now be configured up to 10 times with the same name corresponding with the 10 associations.

VLR Offload Enhancements

The MME now supports the ability to perform a controlled release of UEs when a VLR connection becomes unavailable, as well as the ability to reattach CSFB (SMS-only) UEs when a failed VLR becomes responsive again.

Refer to the sgs vlr-failureand sgs vlr-recover commands in the Exec Mode chapter of the Command Line Interface Reference for more information.

In Release 12.2, the MME introduced a sgs offload sgs-serviceExec Mode command to passively offload UEs for a specific VLR. This capability enables operators to preemptively move subscribers away from an SGs interface associated with an MSS which is planned for maintenance mode.

These features require a valid license key to be installed. Contact your Cisco Account or Support Representative for information on how to obtain a license.

Modified MME Features

This section identifies MME features modified in release 14.0 and contains two types of modifications: enhancements and behavior changes. Feature enhancements are modifications based on customer change requests. Feature behavior changes are modifications based on software error corrections (bug fixes) that result in a change in the behavior of the feature.

APN-specific APN-OI Replacement Behavior Change

New Behavior: The MME now uses the APN-OI replacement value provided by the HSS to construct the FQDN for DNS resolution.

Previous Behavior: The MME ignored this value in previous releases.

Application-specific Overload Controls

A new overload control framework has been introduced to provide additional flexibility to configure application specific handling of overload (congestion) conditions. As a part of this framework, it is now possible to define three threshold levels - critical, major and minor. The operator can define specific threshold values for each of these levels. Each of these levels in turn are associated with congestion action profiles in which application-specific control procedure handling is defined.

These enhancements enable the operator to address localized problems in the network by intelligently invoking congestion procedures on a selective basis.

Application-specific overload control is configured in the Global Configuration Mode using the congestion-control commands. The congestion action profiles which define the actions to take once a congestion condition has occurred are configured in the Congestion Action Profile Configuration mode. Refer to the Global Configuration Mode chapter and Congestion Action Profile Configuration Mode chapter of the Command Line Interface Reference for more information.

Cause Information Element Behavior Change

To distinguish errors in the message level IE versus errors in the grouped IE within the message, the Cause IE is now extended to include a flag indicating whether the rejection cause is due to error in the grouped IE within the message or due to error in IEs at message level. The bits are:

- BCE (Bearer Context IE Error): If this bit is set to 1, it indicates that the corresponding rejection cause is due to the error in the Bearer Context IE.
- PCE (PDN Connection IE Error): If this bit is set to 1, it indicates that the corresponding rejection cause is due to the error in the PDN Connection IE.

Emergency Attach Message Behavior Changes

The IMSI is now conditional in the following GTPv2 messages for Emergency attach sessions:

- Relocation Cancel Request
- Change Notification Request
- Trace Session Activation Request

Enhanced Load Rebalancing Controls

To address the significant signaling events that might be generated when performing load rebalancing across MMEs in a pool, the operator can now specify the percentage of UEs to offload and a time duration in which the rebalancing (offload) procedure occurs.

Extended RNC-ID IE Support

Corrected Content: This section includes corrections to previously published content. The previous content stated that “The MME now supports RNC-ids from 0-64 kilobytes instead of the earlier 0-32 kilobytes range”, which is incorrect.

Support for the Extended RNC-id IE (Information Element) in this release extends the RNC-id range from 0-4095 to 0-65535. The MME will now process the message, construct the Target ID value from the extensions and proceed with the SRNS relocation procedure.

Previously the MME would reject the Handover Required messages received over S1ap when the RNC-id within the Target ID was greater than 4095 bytes. The MME also ignored Forward Relocation Requests received on Gn/Gp interface when the RNC-id within the Target ID was greater than 4095 bytes.

Heuristic Paging Behavior Change

Previous Behavior: If heuristics paging is turned on for the mme-service the following heuristics paging behavior is used:

1. Page the last eNodeB from which the UE contacted the MME in the last TAI from which the UE contacted the MME.

2. Page all eNodeBs in the last TAI from which the UE contacted the MME.

3. Page all eNodeBs in all TAIs present in the TAI list assigned to the UE.

New behavior: For paging requests for Circuit Switch (CS) calls, the MME does not follow this staged paging behavior. Instead, it follows the standards-defined paging mechanism of paging all eNodeBs in all TAIs present in the TAI list assigned to the UE (all-enb-all-tai). Only one attempt is made with no retries.

Inter-RAT Context-ID Mismatch Behavior Change

The MME can now be configured to ignore Context-Identifier mismatches between the HSS and HLR for a given subscriber during inter-RAT procedures. If enabled, the MME uses the Context-ID from the HSS to override the Context-ID from the HLR. If this option is disabled (default), the MME drops the PDN when there is a Context-ID mismatch.

Refer to the policy inter-rat command in the MME Service Mode Configuration chapter of the Command Line Interface Reference for more information.

Licensing Changes

The following features are now enabled by optional licenses:

- Circuit Switch Fall Back
- VLR Offload
- Location Change Reporting.

Location Reporting to PGW Behavior Change

The MME now sends an S11 Change Notification to the PGW only when a TAI/ECGI change occurs. The MME now reports only the information requested by the PGW, either the TAI or ECGI. To accomplish this, the MME maintains separate timestamps for TAI and ECGI at the UE level and a single timestamp for ULI at the PDN context level. In addition to this, counters are maintained at both UE and PDN context to enable location changes that happens within a second.

NAS Compliance with 3GPP Release 9

The following changes have been implemented in support of 3GPP TS 24.301 V9.5.0 (2010-12):

- Accepting all optional IEs by the parser.
- Triggering of authentication procedure if a TAU message fails integrity checks.
- Processing of EPS_Bearer Status IE in Extended Service request.
- Accepting “Add packet filters to existing TFT” (ADD_TFT_TO_EXISTING_FILTERS) operation code in the Traffic flow aggregate IE in a EPS BEARER MODIFICATION request.

Peer SGSN Behavior Change

Multiple peer-sgsn RNC-ID records can now be configured (using the peer-sgsn command in the MME Service Configuration Mode) for the same MCC/MNC/RNC, each with different IP addresses. During a handover, if the initial peer SGSN rejects the forward relocation request, the MME will step through any alternate peer SGSNs to attempt the handover.

RFSP Override

The MME can now be configured to adjust or override the RAT Frequency Selection Priority (RFSP) for subscribers based on the following criteria:

- UE usage setting (voice centric, data centric)
- Voice domain preference (CS voice only, CS voice preferred, IMS PS voice preferred, IMS PS voice only).

RFSP Override is configured in a call control profile that is applied via an operator policy. Refer to the rfsp-override ue-settings command in the Call Control Profile Configuration Mode chapter of the Command Line Interface Reference for more information.

S11 Interface Enhancements

The following enhancements have been made relating to the S11 interface:

- When the MME receives a Delete-Bearer-Request (dedicated BRR delete, PDN delete or UE detach) while it is waiting for a Release-Access-Bearer response, it will now perform the following:
  - If the Delete-Bearer-Request corresponds to a dedicated BRR deletion or additional PDN deletion, the MME replies to the Delete-Bearer-Request and then attempt the rel-access-brr transaction again.
  - If the Delete-Bearer-Request corresponds to the last PDN - UE detach, the MME aborts the IM entry procedure and then proceed towards UE detach.
  Previously, when the MME received a Delete-Bearer-Request while it was waiting for a Release-Access-Bearer response, the Release-Access-Bearer transaction was aborted and the Delete-Bearer-Indication was being sent to MME-App.
- The MME now supports S11 'Failed Bearer Contexts' IE received in the Delete-Bearer-Request message. This IE may be included if the request corresponds to an MME-initiated bearer deactivation procedure. This IE must contain the list of failed bearers if the partial Bearer Contexts included in the Delete Bearer Command message could not be deleted at the P-GW. The Failed Bearer Contexts IE is included by P-GW in cases where the P-GW has implicitly deleted the bearer context, but failed to inform the peer node about it.

SCTP Multihoming Behavior Change

Previous Behavior: When an SCTP association is established and then a secondary IP addresses was added or removed, the SCTP connection would be terminated.

New Behavior: Now when a secondary IP addresses is added to an established SCTP association, an ASCONF chunk is sent to the peer indicating if an IP was added or removed.

SRVCC Handover Behavior Change

During SRVCC Handover, if the MME receives a HANDOVER CANCEL from the source eNodeB during the handover preparation phase, it will now respond with a HANDOVER CANCEL ACK to the source eNB. The MME will send a PS to CS Cancel to the MSC and receive a PS to CS CANCEL ACK in response. If the PS to CS CANCEL ACK has the Service Continuity flag set, the MME will notify the UE to start the session re-establishment procedure by sending it a Notification message with the value “SRVCC handover cancelled, IMS session re-establishment required”.

TAU Updates Behavior Change

Previous Behavior: S-GW relocation occurred irrespective of TAU update type.

New behavior: S-GW selection and relocation is not triggered if the TAU update type is 'PERIODIC UPDATING'.

Timezone Reporting Behavior Change

Previous Behavior: The timezone IE was sent in all S11 messages.

New behavior: The timezone IE is now sent in S11 messages only if there is change in timezone such as due to DST (system clock) change or configuration change at the TAI DB Management or TAI DB Object Configuration Mode level.

MME Configuration Management Changes as of June 29, 2012

This section provides information on MME configuration command changes in release 14.0.

IMPORTANT:

For more information regarding commands in this section, refer to the Command Line Interface Reference for this release.

New MME Configuration Commands

This section identifies new MME commands available in release 14.0.

apn-remap

This command provides the ability to override the APN requested by the UE based on the network identifier or operator identifier.

APN Remap Table Configuration Mode

    apn-remap { network-identifier apn_net_id { new-ni new_apn_net_id | operator-identifier apn_op_id new-ni new_apn_net_id { new-oi new_apn_op_id | value-for-oi-mcc mcc | value-for-oi-mnc mnc } | value-for-ni-wc  new_apn_net_id } | operator-identifier apn_op_id  { new-oi new_apn_op_id | value-for-oi-mcc mcc | value-for-oi-mnc mnc } }

cc

This command provides the ability to override the APN requested by the UE based on the charging characteristics.

APN Remap Table Configuration Mode

    cc behavior bit_value profile index_bit apn-remap network-identifier apn_net_id new-ni new_apn_net_id

congestion-action-profile

This command creates an action profile for MME critical, major and minor congestion thresholds for the Application-specific Overload Control feature. The profile defines the action to be taken when these thresholds are exceeded.

For information on setting the action to be taken within this profile, see the Congestion Action Profile Configuration Mode Commands chapter in the Command Line Interface Reference.

LTE Policy Configuration Mode

    [ no ] congestion-action-profile profile_name

csg-change-notification

This command enables or disables the Closed Subscriber Group (CSG) Information reporting (notification) mechanism on the MME.

MME Service Configuration Mode

    [ default | no ] csg-change-notification

diameter suppress

The MME can now be configured to restrict the sending of the Notify-Request-Message to the HSS. By default, the Notify-Request-Message is sent to the HSS. This can be used to control whether handover to non-3GPP access can occur.

HSS Peer Service Configuration Mode

    [ no ] diameter
    suppress notify-request

isr-capability

This new command enables or disables the Idle mode Signaling Reduction (ISR) feature on the MME service.

MME Service Configuration Mode

    [ no | default ] isr-capability

local-cause-code-mapping

This command enables or disables the Closed Subscriber Group (CSG) Information reporting (notification) mechanism on the MME.

MME Service Configuration Mode

    local-cause-code-mapping
     { congestion emm-cause-code { congestion [ esm-cause-code { congestion | insufficient-resources | service-option-temporarily-out-of-order } ] | eps-service-not-allowed-in-this-plmn | network
    failure | no-suitable-cell-in-tracking-area | plmn-not-allowed | roaming-not-allowed-in-this-tracking-area | tracking-area-not-allowed } | newcall-policy-restrict
    emm-cause-code  emm_cause_code | restricted-zone-code
    emm-cause-code  emm_cause_code }

mapping

This command configures how the MME maps the Target RNC-ID fields to the Target eNodeB-ID and TAC fields for Inter-RAT Gn/Gp handovers.

MME Service Configuration Mode

    mapping rncid-to-enbid { maptype-default-includes-only-enb | maptype1-includes-enb-tai }

mme relocate-ue imsi

This command enables the operator to detach a UE from the current MME and cause it to reattach to another MME in the pool.

Exec Mode

    mme relocate-ue imsi imsi new-guti mme-group-id group_id mme-code mme_code m-tmsi mtmsi

network-name

This command configures the long (full) and short network name used in the Long and Short network name IE in the EMM Information message that is sent to the UE from the MME.

LTE TAI Management Database Configuration Mode

and

LTE TAI Management Object Configuration Mode

    [ no ] network-name [ full full_name | short short_name ]

paging-map

This command has been added in support of the Heuristic and Intelligent Paging feature. It creates a paging map or specifies an existing paging map and enters the Paging Map Configuration Mode.

LTE Policy Profile Configuration Mode

    [ no ] paging-map paging_map_name [ -noconfirm ]

The following command is contained within this new mode:

    [ no ] precedence precedence traffic-type { cs | ps } paging-profile paging_profile_name

Paging Map Configuration Mode commands are defined in the LTE Paging Map Configuration Mode Commands chapter of the Command Line Interface Reference.

paging-profile

This command has been added in support of the Heuristic and Intelligent Paging feature. It creates a paging profile or specifies an existing paging profile and enters the Paging Map Configuration Mode.

LTE Policy Profile Configuration Mode

    [ no ] paging-profile paging_profile_name [ -noconfirm ]

The following command is contained within this new mode:

    [ no ] paging-stage level match-criteria { ue-contact-time seconds | all } action { last-n-enb-last-tai
    max-n-enb value | all-enb-last-tai | all-enb-all-tai } t3413-timeout seconds max-paging-attempts attempts

Paging Profile Configuration Mode commands are defined in the LTE Paging Profile Configuration Mode Commands chapter of the Command Line Interface Reference.

pdn-type-override

This command configures the MME to override the requested Packet Data Network (PDN) type based on the inbound roamer PLMN, and assign the UE to an IPv4-only or IPv6-only PDN.

This override can be applied based on the type of access technology.

Call Control Profile Configuration Mode

    [ remove ] pdn-type-override
    ipv4v6 { ipv4 | ipv6 } access-type { eps | grps | umts }

sgs vlr-failure

This command enables the active detach of UEs connected to a VLR when the VLR becomes unavailable.

Exec Mode

    [ no ] sgs
    vlr-failure sgs-service sgs_svc_name duration minutes backoff-timer  seconds [ -noconfirm ]

sgs vlr-recover

This command enables active recovery of Circuit Switched Fall Back (SMS-only) UEs when a failed VLR becomes responsive again.

Exec Mode

    [ no ] sgs
    vlr-recover sgs-service sgs_svc_name duration minutes backoff-timer  seconds [ -noconfirm ]

Modified MME Configuration Commands

This section identifies MME commands modified in release 14.0.

attach restrict

This command now enables the MME to reject EPS Attaches when the IMSI Attach fails.

The MME can now also be configured to reject EPS Attaches when CSFB and IMS is not available or not configured (voice unsupported).

An EMM cause code can be set for each reject scenario using the emm-cause-code keyword.

Call Control Profile Configuration Mode

    attach restrict access-type
    eps imsi-attach-fail [ emm-cause-code value ]

    attach restrict access-type
    eps voice-unsupported [ emm-cause-code  value ]

congestion-control policy

As part of the Application-specific Overload Control feature, the MME can now be configured to associate a congestion-action-profile for each of three separate threshold levels (critical, major and minor).

Global Configuration Mode

    congestion-control policy { critical
    mme-service action-profile action_profile_name | major mme-service
    action-profile action_profile_name | minor mme-service
    action-profile action_profile_name }

congestion-control threshold

The MME can now be configured with three separate threshold levels (critical, major and minor) for each congestion-control threshold.

The example below shows the changes to the command for the system-memory-utilization threshold.

Global Configuration Mode

    congestion-control
    threshold system-memory-utilization { critical
     percent | major percent | minor percent }

csfb

The MME can now be configured to return a “not-preferred” response for CSFB services.

Call Control Profile Configuration Mode

    csfb policy not-preferred

gw-selection

The MME can now be configured with preferences/weights of the P-GW/S-GW from the NAPTR/SRV resource records for load balancing.

Call Control Profile Configuration Mode

    [ remove ] gw-selection { co-location [ weight [ prefer { sgw | pgw } ] ] | pgw
    weight | sgw weight | topology [ weight [ prefer { sgw | pgw } ] ] }

heuristic-paging

The MME can now be configured to enable intelligent paging by associating a profile-map when heuristic paging is enabled.

Refer to the Heuristic and Intelligent Paging chapter in the MME Administration Guide for more information about this command.

MME Service Configuration Mode

    heuristic-paging [ paging-map paging_map_name ]

local-cause-code-mapping

The MME can now be configured via the call control policy to return a specific emm-cause-code to a UE when encountering a congestion condition by using the new congestion keyword option.

Call Control Profile Configuration Mode

    local-cause-code-mapping { congestion
    emm-cause-code { congestion [ esm-cause-code { congestion | insufficient-resources | service-option-temporarily-out-of-order } ] | eps-service-not-allowed-in-this-plmn | network
    failure | no-suitable-cell-in-tracking-area | plmn-not-allowed | roaming-not-allowed-in-this-tracking-area | tracking-area-not-allowed } | restricted-zone-code
    emm-cause-code emm_cause_code }

mme offload mme-service

This MME load rebalancing (UE offload) command has been updated to include the time-duration, offload-percentage, and disable-implicit-detach keyword options.

The start mme-init-release-timeout seconds paging-init-timeout seconds options have been removed in this release.

Exec Mode

    mme offload mme-service mme_svc_name { time-duration minutes offload-percentage percent [ disable-implicit-detach ] | stop } [ -noconfirm ]

policy inter-rat

This command now includes an ignore-sgsn-context-id keyword option which configures the MME to ignore Context-Identifier mismatches between the HSS and HLR for a given subscriber. If enabled, the MME uses the Context-ID from the HSS to override the Context-ID from the HLR. If this option is disabled (default), the MME will drop the PDN when there is a Context-ID mismatch.

MME Service Configuration Mode

    policy inter-rat { ignore-sgsn-context-id | indirect-forwarding-tunnels
    always }

qos prefer-as-cap

This qos command has been enhanced to specifies the QoS cap value to use using the prefer-as-cap keyword.

Call Control Profile Configuration Mode

    qos prefer-as-cap { both-hlr-and-local | both-hss-and-local { local-when-subscription-not-available | minimum | subscription-exceed-reject } | hlr-subscription | local }

IMPORTANT:

No changes were made to the syntax of this command. All changes are embedded.

qos prefer-as-cap (Behavior change)

Previous Behavior: The MME used hlr-subscription as the default.

New Behavior: The MME has no default for this command.

APN Profile Configuration Mode

    qos prefer-as-cap { both-hlr-and-local | both-hss-and-local { local-when-subscription-not-available | minimum | subscription-exceed-reject } | hlr-subscription | local }

IMPORTANT:

No changes were made to the syntax of this command. All changes are embedded.

rfsp-override

This command now includes the ability to override of the RAT Frequency Selection Priority (RFSP) of matching subscribers based on UE usage setting and voice domain preference.

Call Control Profile Configuration Mode

    [ remove ] rfsp-override
    ue-settings { data-centric ue-voice-domain-preference { cs-voice-only | cs-voice-preferred-ims-ps-voice-secondary | ims-ps-voice-only | ims-ps-voice-preferred-cs-voice-secondary } | voice-centric
    ue-voice-domain-preference { cs-voice-only | cs-voice-preferred-ims-ps-voice-secondary | ims-ps-voice-only | ims-ps-voice-preferred-cs-voice-secondary } new-val value }

timer

This command has been updated to include the following new configurable SGs-AP timers: ts10 | ts12-1 | ts12-2 | ts6-1 | ts8 | ts9.

MME SGs Service Configuration Mode

    timer { ts10 value | ts12-1 value | ts12-2 value | ts6-1 value | ts8 value | ts9 value }

timezone

This command has been updated to include a new daylight-savings-time-increment keyword. This keyword specifies the number of hours the timezone should be offset due to daylight savings time. This allows the MME to serve areas that have daylight savings time different than that of the MME.

LTE TAI Management Database Configuration Mode

and

LTE TAI Management Object Configuration Mode

    timezone { + | - } hours value [ minutes { 0 | 15 | 30 | 45 } | daylight-savings-time-increment { 0 | 1 | 2 } ]

vlr

This command has been enhanced to allow each individual VLR to be defined with up to 10 separate associations to a single MSS pool. Refer to the SGs Architecture Enhancements section in this chapter for more information about these changes.

MME SGs Service Configuation Mode

    vlr vlr_name { ipv4-address ipv4_address [ ipv4-address ipv4_address ] | ipv6-address ipv6_address [ ipv6-address ipv6_address ] } port port_number

Deprecated MME Configuration Commands

This section identifies deprecated MME commands that are no longer supported in release 14.0.

mme offload mme-service

The start mme-init-release-timeout seconds paging-init-timeout seconds options have been removed in this release.

Exec Mode

    mme offload mme-service mme_svc_name { time-duration minutes offload-percentage percent [ disable-implicit-detach ] | stop } [ -noconfirm ]

MME Performance Management Changes as of June 29, 2012

This section provides information on MME performance management changes in release 14.0.

IMPORTANT:

For more information regarding bulk statistics in this section, refer to the Statistics and Counters Reference for this release.

For more information regarding commands in this section, refer to the Command Line Interface Reference for this release.

New MME Bulk Statistics

This section identifies new MME bulk statistics available in release 14.0.

MME Schema

- ecmevent-nw-srvcreq-attempt
- ecmevent-nw-srvcreq-success
- ecmevent-nw-srvcreq-failure
- esmevent-pdncon-ipv4-attempt
- esmevent-pdncon-ipv4-success
- esmevent-pdncon-ipv4-failure
- esmevent-pdncon-ipv6-attempt
- esmevent-pdncon-ipv6-success
- esmevent-pdncon-ipv6-failure
- emm-msgtx-eps-non-eps-not-allowed
- emm-msgtx-no-eps-svc-plmn
- emm-msgtx-tau-no-eps-svc-plmn
- esm-msgtx-brralloc-rej-auth-failed
- esm-msgtx-brralloc-rej-svc-not-supported
- esm-msgtx-brralloc-rej-svc-not-subscribed
- esm-msgtx-brrmod-rej-auth-failed
- esm-msgtx-brrmod-rej-svc-not-supported
- esm-msgtx-brrmod-rej-svc-not-subscribed
- esm-msgtx-pdncon-rej-auth-failed
- esm-msgtx-pdncon-rej-svc-not-supported
- esm-msgtx-pdncon-rej-svc-not-subscribed
- isr-deactivation-s3-pathfail
- isr-deactivation-sgsn-localdetach
- isr-deactivation-sgw-reloc
- isr-deactivation-cn-nodereloc
- isr-deactivation-impdetach
- isr-deactivation-otherdetach
- isr-deactivation-otherreason

eGTP-C Schema

The following eGTP-C Schema bulk statistics have been introduced for the Idle-mode Signaling Reduction feature:

- mobility-sent-cspagingind
- mobility-recv-cspagingind
- mobility-sent-alertmmenotf
- mobility-sent-retransalertmmenotf
- mobility-recv-alertmmenotf
- mobility-recv-retransalertmmenotf
- mobility-sent-alertmmeack
- mobility-sent-retransalertmmeack
- mobility-recv-alertmmeack
- mobility-recv-retransalertmmeack
- mobility-sent-alertmmeackaccept
- mobility-sent-alertmmeackdenied
- mobility-recv-alertmmeackaccept
- mobility-recv-alertmmeackdenied
- mobility-sent-ueactivitynotf
- mobility-sent-ueactivitynotf
- mobility-sent-retransueactivitynotf
- mobility-recv-ueactivitynotf
- mobility-recv-retransueactivitynotf
- mobility-sent-ueactivityack
- mobility-sent-retransueactivityack
- mobility-recv-ueactivityack
- mobility-recv-retransueactivityack
- mobility-sent-ueactivityackaccept
- mobility-sent-ueactivityackdenied
- mobility-recv-ueactivityackaccept
- mobility-recv-ueactivityackdenied
- mobility-sent-detachnotf
- mobility-sent-retransdetachnotf
- mobility-recv-detachnotf
- mobility-recv-retransdetachnotf
- mobility-sent-detachack
- mobility-recv-detachack
- mobility-sent-detachackaccept
- mobility-sent-detachackdenied
- mobility-recv-detachackaccept
- mobility-recv-detachackdenied

The following eGTP-C Schema bulk statistics have been introduced for the Single Radio Voice Call Continuity (SRVCC) feature:

- srvcc-sent-pstocsreq
- srvcc-sent-retranspstocsreq
- srvcc-recv-pstocsreq
- srvcc-recv-pstocsrspaccept
- srvcc-recv-pstocsrspdenied
- srvcc-recv-pstocscmpnotf
- srvcc-recv-retranspstocscmpnotf
- srvcc-sent-pstocscmpack
- srvcc-sent-retranspstocscmpack
- srvcc-sent-pstocscmpackaccept
- srvcc-sent-pstocscmpackdenied
- srvcc-sent-pstocscancelnotf
- srvcc-sent-retranspstocscancelnotf
- srvcc-recv-pstocscancelack
- srvcc-recv-pstocscanelackaccept
- srvcc-recv-pstocscancelackdenied

HSS Schema

This new Home Subscriber Server (HSS) schema has been introduced to provide operational statistics that can be used for monitoring and troubleshooting of the S6a and S13 interfaces.

SGS-VLR Schema

This new SGs schema has been introduced to provide operational statistics that can be used for monitoring and troubleshooting of the SGs connections on a per-VLR basis.

Modified MME Bulk Statistics

This section identifies MME bulk statistics modified in release 14.0.

MME Schema

- Old: ecmevent-srvcreq-attempt New: ecmevent-ue-srvcreq-attempt
- Old: ecmevent-srvcreq-success New: ecmevent-ue-srvcreq-success
- Old: ecmevent-srvcreq-failure New: ecmevent-ue-srvcreq-failure

Deprecated MME Bulk Statistics

This section identifies deprecated MME bulk statistics that are no longer supported in release 14.0.

MME Schema

- emm-msgrx-attach-retx
- emm-msgrx-tau-retx

New MME Performance Commands

This section identifies new MME performance commands available in release 14.0.

show lte-policy paging-map

The following commands show information about the paging maps used for the Heuristic and Intelligent Paging feature.

Exec Mode

    show lte-policy paging-map summary

    show lte-policy paging-map
    name <name>

show lte-policy paging-profile

The following commands show information about the paging profiles used for the Heuristic and Intelligent Paging feature.

Exec Mode

    show lte-policy paging-profile summary

    show lte-policy paging-profile
    name <name>

Modified MME Performance Commands

This section identifies MME performance commands modified in release 14.0.

clear mme-service statistics

This command includes a new offload keyword to clear load rebalancing (UE offload) statistics.

Exec Mode

    clear mme-service statistics [ mme-service mme_svc_name [ offload ] | offload | peer-id peer_identifier [ offload ]

show call-control-profile full name

The following fields have been added to the output of this command:

- Idle-mode-Signaling-Reduction (ISR) for UMTS
- Idle-mode-Signaling-Reduction (ISR) for GPRS
- Location Reporting for UMTS
- Location Reporting for GPRS
- EPS Attach Restrict
- Voice Unsupported
- IMSI Attach Fail
- CFSB Restrictions
- SMS Only
- Not Allowed
- Not Preferred
- GPRS PDP Type IPV4V6 Override
- UMTS PDP Type IPV4V6 Override
- EPS PDN Type IPV4V6 Override
- RFSP

Exec Mode

    show call-control-profile
    full name name

show congestion-control configuration

This command now displays congestion-control configuration information for each of the MME threshold levels – critical, major and minor.

Exec Mode

    show congestion-control configuration

show congestion-control statistics

The system can displays congestion-control statistics for the MME based on the individual threshold level (critical, major or minor) or all threshold levels.

Exec Mode

    show congestion-control
    statistics mme { critical | full | major | minor } [ | { grep  grep_options | more } ]

show hss-peer-service service all

The following fields have been added to the output of this command to show the configuration of the diameter suppress command.

- Notify-Req-Msg

Exec Mode

    show hss-peer-service
    service all

show lte-policy tai-mgmt-db

The following fields have been added or updated in the output of this command:

- Time Zone (now shows the value for daylight-savings-time-increment such as “DST 1”)
- Short Network Name
- Long Network Name

Exec Mode

    show lte-policy tai-mgmt-db name

show mme-service all

Exec Mode

    show mme-service all

The following fields have been added to the output of this command:

- CSG Change Notification
- Heuristic Paging
- Heuristic Paging Map
- Inter-RAT Mapping RNCID to eNBID
- Condition Restricted zone code
- Condition Congestion
- Condition Newcall policy restrict

show mme-service db record imsi

The following tables have been added to the output of this command:

- UE Tracking Information: Last Reported 5 eNBs (most recent first)
- UE Tracking Information: Last Reported 7 ECGIs (most recent first)

Exec Mode

    show mme-service db
    record imsi imsi

show mme-service enodeb-association

This command includes a new enodeb-name keyword to display information for only the specified eNodeB.

Exec Mode

    show mme-service enodeb-association
    enodeb-name enodeb_name

show mme-service name

This command includes a new offload statistics keyword to display configuration information for the MME load rebalancing feature (UE offload), as well as current statistics about any active offloading processes.

Exec Mode

    show mme-service { all | name svc_name [ offload
    statistics ] } [ | { grep grep_options | more } ]

show mme-service session counters

The following two groups have been added to the output of this command and replace the existing group Service Request Events:

- UE Requested Service Request Events
- NW Initiated Service Request Events

Exec Mode

    show mme-service session counters

show mme-service statistics

The following two groups have been added to the output of this command and replace the existing group Service Request Events:

- UE Requested Service Request Events
- NW Initiated Service Request Events

The following fields have been added to the output of this command:

- PDN Connections with PDN-type Override to IPv4
- PDN Connections with PDN-type Override to IPv6
- EPS PDN Type IPV4V6 Override
- Total EMM Control Messages
- - EPS and non EPS Not Allowed
  - EPS Not allowed in this PLMN
- Total ESM Control Messages
- - Authentication failed
  - Sv opt not supported
  - Svc opt not subscribed
- ISR deactivation Statistics
- - S3 path failure
  - SGSN local detach
  - SGW relocation
  - CN Node relocation
  - Implicit detach
  - Other detach procedures
  - Other reasons

The Success at Last eNBs field output has been replaced in this release with the Success at Last n eNBs field.

Exec Mode

    show mme-service statistics

show mme-service session full

The following fields have been added to the output of this command:

- Idle Mode Information Data
- - Last TAI
  - Last ECGI
  - Last Connected ENodeB
  - - Global ENodeB ID
    - S1AP End Point
- CSG Cell Change Notification
- CSG Subscribed Hybrid Cell Change Notification
- CSG Unsubscribed Hybrid Cell Change Notification
- CSG Information
- - CSG ID at Last Connection
  - CSG Cell Type
  - CSG Membership Status
- PCI
- PVI

Exec Mode

    show mme-service session full

show sgs-service all

The following fields have been added to the output of this command:

- Timer Ts8
- Timer Ts9
- Timer Ts10
- Timer Ts12-1
- Timer Ts12-2

Exec Mode

    show sgs-service all

show sgs-service vlr-status full

Omitted Content: The following fields were added to the output of this command in the June 29, 2012 release, but were omitted from this document until now:

- VLR Failure Detach
- VLR Recover Detach

Exec Mode

    show sgs-service vlr-status
    full

show session subsystem facility mmedemux

The following fields have been added to the output of this command:

- Total number of packets dropped
- Total number of octets dropped

Exec Mode

    show session subsystem
    facility mmedemux

show subscribers

A new sgw-address keyword displays information about the subscribers connected to the specified S-GW.

Exec Mode

    show subscribers sgw-address ip_address

Deprecated MME Performance Commands

This section identifies deprecated MME performance commands that are no longer supported in release 14.0.

show mme-service all

The following fields have been removed from the output of this command as a result of the enhancements to the MME load rebalancing feature:

- MME Offloading
- MME Init Release Timeout
- MME Paging Init Timeout

Exec Mode

    show mme-service all

show mme-service statistics

The Service Request Events group of counters (attempts/successes/failures) have been deprecated from the output of this command and replaced by the UE Requested Service Request Events and NW Initiated Service Request Events groups.

The following fields have been removed from the output of this command:

- TAU Request: Retransmissions – The total number of retransmitted EMM TAU Request messages received for a specific ECM event associated with all MME services on the system.
- Attach Request: Retransmissions – The total number of retransmitted EMM Attach Request messages received for a specific ECM event associated with all MME services on the system.

Exec Mode

    show mme-service statistics

MME Security Management Changes as of June 29, 2012

This section provides information on MME security management changes in release 14.0.

None for this release.