2nd Carrier Optimisation ProgramVersion 1.1
Presentation / Author / Date
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To have the optimum number of ADJS/ ADJI/ ADJG of 3G network both in F1 and F2.
To optimize the 3G coverage in both layers. This can help to
Clean up Pilot Pollution,
Objective
Scope
Optimisation will be done for 2nd carrier cluster only. This may have to include sites outside the cluster that affect the performance of sites in the cluster.
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Presentation / Author / Date
Network Design Scenario
Connected Mode Strategy (Macro)
Inter frequency handover adjacency is defined oneway F2 -> F1 to ensure mobility (except for colocated site, IFHO F1 -> F2 must be defined only for HSDPA to make sure HSPA Capability Handover)
ADJG from F2 on 3G-2G border to ensure mobility. One-Way From F2 2G Only
F2: HSDPA+R99
F2: HSDPA+R99
S1
S2
S3
Below ADJI Strategic is ideally used for Capability Based Handover. Figure shows How to define ADJI in one site.
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SHO Overhead (RSRAN028) (optional)
Site Location Info ( To get Latitude/ Longitude)
MapInfo ( To have visualize for neighbor planning)
Planning Tool to calculate Antenna Tilting
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PRACHDelayRange = 3 (20 km)
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Propagation Distance Distribution
205 Cells in UPD3 is having propagation distance farer than 7 km. Need to carefully visualize on Mapinfo for downtilt decisions.
Value can be changed depend on cluster environment
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Propagation Distance list
(7 days data)
This could be used as an indicator for cells with having improper coverage footprint (Overshoot).
We may plot the MAX PRACH Delay Class on Mapinfo for better visualization of coverage footprint of cells in our cluster. (See Next Slide)
comb
WCEL_ID
Overshooting detected by Autodef+ PRACH Delay
Missing ADJS detected by Autodef
From Propagation Delay on Mapinfo, we can get an insight of How coverage propagation look like.
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Neighbour Deletion Diagram
Use Autodef Data for last 7 days, Aggregate “Whole Period”
Distance can be changed according to environment
Value can be changed depend on traffic density in each cluster.
Adjs/Adji/Adjg respectively
Adj Distance > 5 km.
Yes
Delete Adj after Downtilting done
In line with the list
Keep the Adj (Use for Preventive Or Low att due to Capacity issue)
No
Use Autodef Data for last 7 days, Aggregate “Whole Period”
Value can be changed depend on traffic density in each cluster.
Adjs/Adji/Adjg respectively
HO Attempts > 50/15/15
Add Adj If Nbr of all adjx < 36
No
No
Yes
Yes
No
Start with ADJx Deletion. F1 and F2 (Autodef 7-days Data)
Delete ADJI F1 F2 for Non-Collocated Site, if any
Create ADJI F1<--> F2 for Collocated Site (like Page 5)
ADJS Addition in each Layer.(Autodef 7-days Data)
F1 <-> F1
F2 <-> F2
ADJS addition MUST be done before ADJI and ADJG addition. Good ADJS planning can significantly reduce interference, as a result number of required ADJG and AGJI will also decrease.
ADJI Addition. (Autodef 3-5 days Data)
F1 <-> F2
F2 <-> F1
Again, well planned for ADJI will reduce Number of ADJG neighbors
ADJG Addition (Autodef 3-5 days Data)
F2 2G
F1 2G
At the end, we also expect to see number of ADJG from:
F2 GSM < F1 GSM
1/2/3 can be executed at the same night.
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SIB11 Planning
IF ADJS+ADJG+ADJI <= 47, Set ADJx = SIB11(1) for all ADJx
IF ADJS+ADJG+ADJI > 47,
For F1
Set ADJx = SIB11(1) for (all ADJS + main ADJI + main ADJG) <= 47
Set ADJx = SIBbis(2) for the “Remaining” ADJI and ADJG.
For F2
Set ADJx = SIB11(1) for (main ADJS + all ADJI + main ADJG) <= 47
Set ADJx = SIBbis(2) for the “Remaining” ADJG and ADJS.
IF Overshooting case,
Set ADJx = Not Broadcast (0).
[This is not to allow UE camping on cells that very far away and later the ADJx will be deleted anyway, when downtilt done]
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End Results
In general case, Final combined Neighbour (Adjs+Adjg+Adji) <= 36 Neighbours
Try NOT to use SIB11bis, or use it as less as possible.
No Cell blocking Alarm due to Too many neighbors (Alarm ID_7771)
Provide Antenna Downtilting List to Customer.
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Presentation / Author / Date
Keep the Adj
(Use for Preventive
Capacity issue)
No
Yes
Yes
No
Visualise on