ZTE ANR Application Introduction
FDD LTE
ANR Solution Overview
NMS
EMS(NetNumen)
*5*Update
neighbor
cell information
Unknown new
neighbor cell
Serving Cell
*4.1*uniqueness check of
neighbor cell information
*4.2*neighbor cell statistics
for addition and deletion
*2.2(o)*Cell Configuration update via X2
*3.2(o)*neighbor mutual configuration check
*3.3(o)* Missing neighbor cell check from MRO
Benefits
Description



Intra/inter-frequency LTE, Inter RAT (L-U)
Neighbor cell addition, deletion and update
Based on UE measurement and X2 configuration exchange


Reduce neighbor cell planning and optimization effort
Minimize call drops and handover failures
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2
PCI: Physical Cell ID
CGI: Global Cell ID
NetNumen: ZTE EMS System
ANR solution Architecture
ANR function can be classified as the distributed SON case, which can support multi-vendor scenes.
EMS Layer:
EMS
UniRANSmall Cell
eNodeB
•Policy Management
•monitoring and log management
•Configuration and performance
management
eNodeB Layer:
•ANR algorithm execution
• Measurement configuration and statistics
UE Layer:
UE
•Measurement report
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Theory introduction--addition
3 states of the missing neighbor cell during the ANR addition procedure
Unknown PCI detection
of the missing neighbor
Temporary
neighbor cell list
The procedure in Uu interface for intraLTE
/ frequency ANR
Cell A
Phy-CID=3
Global-CID =17
Formal neighbor
cell list
The procedure in Uu interface for interRAT/frequency ANR
Cell A
Type = LTE
Phy-CID= 3
Global-CID =17
Cell B
Type = UTRAN
Phy-CID=PSC=5
Global-CID =19
2) Report Neighbour
Response (Phy-CID,
Signal level)
Cell B
Phy-CID=5
Global-CID =19
1) Report Neighbour Request
(RAT, Frequency)
1) report(Phy-CID=5,
strong signal)
3b) Read BCCH (…)
3) Report
Global-CID=19
2b) Read BCCH()
4) Report
Global-CID=19
2) Report Global-CID
Request (Target PhyCID=5)
3) Report Global-CID
Request (Target Phy-CID=5)
Theory introduction--deletion
Adjacent cell
in eNB level
Neighbor relations
in cell level
•Redundant adjacent cell
cell1
cell2
•Associated with the performance
threshold
NBR
NBR
NBR 1
NBR 2
NBR X
NBR Y
•No handover in a long
period
threshold
NBR Y
NBR X
NBR 2
NBR 1
HO times
Per period
1
2
3
N-n
1
2
M
new NBRs
success rate
•Cells with low handover
success rate
•Replacement
Existing NBRs
cell3
N-n+M-N=M-n NBR will be deleted
•M is the new NBR
number
•N is the ANR
deletion threshold
•n.>=0&n<=N
ANR deployment instruction
Key parameter setting suggestion
Parameter name
Description
Intra-LTE ANR Switch
This parameter indicates whether the intra-LTE ANR function is supported or not.
Recommendation:1
Run Mode
0:Free Mode,1:Controlled Mode. Recommendation:0
Intra-LTE ANR Self-Delete Switch
This parameter indicates whether the intra-LTE ANR self-delete function is supported or not.
Recommendation:1
Handover Success Rate Threshold for
Intra-Frequency Neighbor Cell Addition
Only the neighbor cell whose handover success rate is higher than or equal to this threshold can
be added to formal neighbor cell list. Recommendation:98%
The Maximum number of Adjacent Cell
Which are Intra-Frequency in Intra-LTE
The Number of Adjacent Cells which are Intra-Frequency cannot exceeds the value of this
parameter when the Intra-LTE ANR has opened. Recommendation:64
The Maximum number of Adjacent Cell
Which are Inter-Frequency in Intra-LTE
The Number of Adjacent Cells which are Inter-Frequency cannot exceeds the value of this
parameter when the Inter-LTE ANR has opened. Recommendation:64
Timer Length for ANR Temporary
Neighbor Cell Statistic
When the ANR temporary neighbor cell is added, the eNodeB will start a statistic timer to count
MR times and HO success times. Recommendation: 24 Hours
Neighbor Cell Report Threshold
Only the neighbor cell whose MR report number is higher than or equal to this threshold can be
added to formal neighbor cell list. Recommendation: more than 10
Handover Success Threshold
Only the neighbor cell whose HO Success number is higher than or equal to this threshold can be
added to formal neighbor cell list. Recommendation: more than 10
LTE Unknown PCI RSRP Threshold
When the rsrp of LTE unknown PCI exceeds this threshold, ANR perform ECGI measurement for the
unknown PCI. Recommendation: -95dBm
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6
Evaluation
Network performance
KPI/Counter Classification
Access
KPI/Counter Description
Successful Air Interface Connection Rate
E-RAB Setup Success Rate
RRC Establishment Success Rate
RRC connection reestablishment times
RRC connection reestablishment success rate
Call drop rate
Retention
Mobility
E-RAB drop rate
HO out success rate
Counter
Description
Number of Different Detect Cell intra RAT
Number of Report Detect Cell intra RAT
Number of Report CGI by UE intra RAT
Number of ReportCGI by Period intra RAT
Number of Successful ReportCGI by Period intra RAT
Number of neighbor cells added by ANR
Number of neighbor cells deleted by ANR replacement
Number of neighbor cells deleted by ANR low handover success rate
Number of neighbor cells deleted by ANR continuous handover failure
Number of neighbor cells deleted by ANR long-time no handover
Number of neighbor cells deleted by ANR redundancy deletion
Brief Summary

ANR Process

Principle

Work flow

Parameter and deployment suggestion

Evaluation
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Thank you!