Cisco Cisco Mobility Unified Reporting User Guide
Mobility Management Entity Overview
▀ Features and Functionality - Base Software
▄ Cisco ASR 5000 Series Product Overview
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The benefits of MME pooling are:
Enables Geographical Redundancy, as a pool can be distributed across sites.
Increases overall capacity, as load sharing across the MMEs in a pool is possible (see the Load Balancing feature
in this chapter).
Converts inter-MME Tracking Area Updates (TAUs) to intra-MME TAUs for moves between the MMEs of the
same pool. This substantially reduces signaling load as well as data transfer delays.
Eases introduction of new nodes and replacement of old nodes as subscribers can be moved is a planned manner
to the new node.
Eliminates single point of failure between an eNodeB and MME.
Enables service downtime free maintenance scheduling.
An MME Pool Area is defined as an area within which a UE may be served without need to change the serving MME.
An MME Pool Area is served by one or more MMEs in parallel. MME Pool Areas are a collection of complete
Tracking Areas. MME Pool Areas may overlap each other.
An MME Pool Area is served by one or more MMEs in parallel. MME Pool Areas are a collection of complete
Tracking Areas. MME Pool Areas may overlap each other.
The Cisco MME supports MME Pooling functionality as defined in 3GPP TS 23.401. MME pooling allows carriers to
load balance sessions among pooled MMEs.
The Cisco MME supports configuration of up to a pool size of 32 nodes.
load balance sessions among pooled MMEs.
The Cisco MME supports configuration of up to a pool size of 32 nodes.
MME Selection
The MME selection function selects an available MME for serving a UE. This feature is needed for MME selection for
handover with minimal MME changes.
MME selection chooses an available MME for serving a UE. Selection is based on network topology, i.e. the selected
MME serves the UE’s location and in case of overlapping MME service areas, the selection function may prefer MME’s
with service areas that reduce the probability of changing the MME.
handover with minimal MME changes.
MME selection chooses an available MME for serving a UE. Selection is based on network topology, i.e. the selected
MME serves the UE’s location and in case of overlapping MME service areas, the selection function may prefer MME’s
with service areas that reduce the probability of changing the MME.
Mobile Equipment Identity Check
The Mobile Equipment Identity Check Procedure permits the operator(s) of the MME and/or the HSS and/or the PDN-
GW to check the Mobile Equipment's identity with EIR.
The mobile equipment (ME) identity is checked through the MME by passing it to an Equipment Identity Register
(EIR) over the S13 interface and then the MME analyzes the response from the EIR in order to determine its subsequent
actions; like rejecting or attaching a UE.
GW to check the Mobile Equipment's identity with EIR.
The mobile equipment (ME) identity is checked through the MME by passing it to an Equipment Identity Register
(EIR) over the S13 interface and then the MME analyzes the response from the EIR in order to determine its subsequent
actions; like rejecting or attaching a UE.
Mobility Restriction
The following types of mobility restriction are supported on the MME:
Handover Restriction
Handover Restriction
Mobility Restriction comprises the functions for restrictions to mobility handling of a UE in E-UTRAN access. In
ECM-CONNECTED state, the core network provides the radio network with a Handover Restriction List.
ECM-CONNECTED state, the core network provides the radio network with a Handover Restriction List.