LTE Jabo ANR Strategy Activities
ANR OPTIMIZATION
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Quick Summary
Objective: To optimize ANR function
Parameter Setting: DelCellThd=20, NcellHoStatNum=100;
NRTDELMODE=EUTRAN_DELREDUNDANCENCELL-1;
StatisticPeriodForNRTDel=2880;
NcellHoForNRTDelThd=10;
EventANRMode=NOT_BASED_NCL;
Jabo Implementation : 14th September 2015 total of 455 eNodeBs with 1359cells
KPI & Trial Results:
•Main KPIs maintain
•ANR Auto Delete function optimized
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Optimize ANR Delete Function
Green Text : Current Value
Brown Text : Value to be Changed
ANR Auto NRT Delete Function
Inappropriate neighbor
Priority Based (when neighbor is max)

Switch : IntraRatAnrAutoDel Switch of EnodebAlgoSwitch.AnrSwitch (ON)

ANR.StatisticPeriodforNRTDel (10080mins=1week) --- (2880mins=2days)

IF total number of cell-to-cell attempt > ANR.NcellHoStatNum (200) --- (100)
& HOSR <= ANR.DelCellThd (50%) ---(20%)
IN ANR.StatisticPeriod (1440mins=1day)

IF total number of attempt to all neighboring cells < ANR.StatisticNumForNRTDel (200)
Do nothing
else if total number of cell-to-cell attempt < ANR.NcellHoForNRTDelThd (0) --- (10)
Delete neighbor with least attempt
Redundant neighbor

Switch : IntraRatAnrAutoDel Switch of EnodebAlgoSwitch.AnrSwitch (ON) & ANR.NRTDelMode = Eutran_DelRedundanceNCell (OFF) --- (ON)

IF total number of attempt is ZERO & total attempt to all neighboring cells > ANR.StatisticNumForNRTDel (200)
IN 4*ANR.StatisticPeriodForNRTDel (10080mins=1week*4) --- (2880mins=2day*4)
+++++ Change EventAnrMode : BASED_NCL ---- (NOT_BASED_NCL)
Intra-RAT event-triggered ANR adds a neighbor relationship to an NRT based on the CGI reported from the UE but not based on the NCL defined
earlier.
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ANR Delete Optimization Result
ANR Auto Delete Optimization is currently working fine.
From ANR log, it is found that ANR delete more cells than before. Furthermore, failure of adding neighbor relationship reduced.
Previously some neighbor fail to be added in neighbor list due to the source cell having maximum configuration of neighbor (256
neighbors). Currently, there are only 3cells having maximum configuration of neighbor which is much more lesser compare to 8 th
September where there are total of 28cells.
Date
9/8/2015
9/25/2015
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Jabo Total Neighbor Count Cell having maximum configuration of neighbor
126396 28cells = 256 neighbors
116954 3cells = 256 neighbors
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ANR Delete Optimization - Punishment
However, it is found that there is some neighbor relation has repeatedly add & delete. To avoid this to happen, ANR punishment
mechanism can be used to reduce the scenario.
Neighbor relationship which deleted by ANR will be put in monitoring list. If within 1440mins the HO request > 100, the neighbor will
be added back in NRT, else it will remain in monitoring list and not to be added. By this repeatedly add&delete neighbors scenario
can be minimized and limit ANR to only add necessary neighbor.
Parameter
MML
Neighbor Cell Deletion Punish Period
(ENBRSVDPARA)
EUTRAN Neighbor Cell Deletion
Punish Number (ENBRSVDPARA)
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Description
Values
RsvdPara25
Indicates the penalty statistics period during which a
deleted neighbor relationship with an E-UTRAN or
UTRAN cell can be added to the neighboring relation
table (NRT) again if the number of times neighboring EUTRAN or UTRAN cell addition is triggered is greater
than or equal to the value of the
EutranNcellDelPunNum.
1440
RsvdPara26
Indicates the number of times penalty statistics about
neighboring E-UTRAN cell deletion are collected.
When a neighbor relationship with an E-UTRAN cell is
deleted, it can be added to the NRT again if the
number of times neighboring E-UTRAN cell addition is
triggered is greater than or equal to the value of this
parameter.
100
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