Cisco Cisco ASR 5000 Administrator's Guide

 

This section describes the optional enhanced features and functions support with HeNB-GW service. 

  Some of the following features may require the purchase of an additional license to implement the 

functionality with the HeNB-GW service. 

This section describes following features: 

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Automatic Neighbour Relation (ANR) functionality is nothing but relieving the operator from the complexity of 
manually managing Neighbor Relations (NRs). In LTE deployments, the manual management of NRs becomes even 
more challenging, as in addition of defining intra LTE neighbour relations for eNodeBs, operator has to provision 
neighboring 2G, 3G, CDMA2000 cells as well. 

The ANR function resides in the eNodeB and manages the conceptual Neighbour Relation Table (NRT). Located within 
ANR, the Neighbour Detection Function (NDF) finds new neighbours and adds them to the NRT. ANR also contains 
the Neighbour Removal Function (NRF) which removes outdated NRs. The NDF and the NRF functions are specific to 
the implementation by operator. 

An existing Neighbour cell Relation (NR) from a source cell to a target cell means that eNodeB controlling the source 
cell knows the ECGI/CGI and Physical Cell Identifier (PCI) of the target cell and has an entry in the NRT for the source 
cell identifying the target cell. 

For each cell that the eNodeB has, the eNodeB keeps an NRT. For each NR, the NRT contains the Target Cell Identifier 
(TCI), which identifies the target cell. For E-UTRAN, the TCI corresponds to the E-UTRAN Cell Global Identifier 
(ECGI) and Physical Cell Identifier (PCI) of the target cell. 

The ANR function relies on cells broadcasting their identity on global level, ECGI and allows O&M to manage the 
NRT 

Due to the high volume and small-sized femtocell deployment, it is well-known that paging messages is a big burden for 
the femtocell system.In order to optimize the paging procedure by the HeNB-GW, the HeNB-GW is made aware of the 
CSGs supported by the connected HeNBs. This allows the HeNB-GW to identify the appropriate HeNBs supporting 
certain CSGs. This is known through the S1-Setup request sent by HeNBs. 

In order to have a complete paging optimization solution, the allowed CSG list of the paged UE is included in the 
paging message. The paging message is then sent with the allowed CSG list of the paged UE to the HeNB-GW by 
MME.