Manually adding neighbor cells in network is indeed a very hectic process and prone to errors as well. While networks are becoming more and more complex, it is required to find an automatic and a more optimized way of adding neighbor cells.
ANR comes under the umbrella of Self Organizing Networks ( SON) features. ANR relies on UE to detect unknown cells and report them to eNB. There are two major types:
i) UE based ANR
ii) ANR with OAM Support
ANR comes under the umbrella of Self Organizing Networks ( SON) features. ANR relies on UE to detect unknown cells and report them to eNB. There are two major types:
i) UE based ANR
ii) ANR with OAM Support
UE based ANR
- No OAM support is required.
- UE detects PCI of unknown cell when it needs to do measurement (as configured by network)
- In case of inter-frequency or inter-RAT measurements, eNB needs to configure measurement gaps/or DRX so UE can detect PCI to different frequencies as well.
- UE reports the unknown PCI to eNB via RRC-Reconfiguration message.
- eNB request UE to report Eutran Cell Global ID (ECGI).
- UE reports ECGI by reading BCCH channel.
- eNB retrieves the IP address from MME to further setup the x2 interface.
ANR with OAM Support
- OAM support is required
- Every new eNB registers to OAM and download the table with information of PCI/ECGI/IP related to neighbors
- Neighbors also update their own table with new eNB information
- Now like "UE based ANR", UE will detect unknown PCI and report it to the eNB
- eNB doesn't request for ECGI and does not need support from MME
- eNB setups x2 interface with the help of mapping table created in second step above
This comment has been removed by the author.
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