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LTE Cell Parameter Planning NA NPS RSRC: Huhao September.2015
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Content LTE RF Parameters Introduction PCI/PRACH Planning with U-net Coverage Simulation with U-net Neighbor Planning with SmartRNO Parameter Planning Manually TAC/TAL Planning Manually PCI/PRACH Planning Manually
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LTE RF Parameters Introduction
When we have a new LTE site, what should we do before and after site integration? plan engineering parameters(EPT) for this site prepare scripts execute scripts What software can we use when working for a new LTE site? plan engineering parameters(EPT) for this site->U-net prepare scripts->SmartRNO execute scripts->U2000 In this course we only refer to U-net and SmartRNO. HUAWEI TECHNOLOGIES CO., LTD.
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LTE RF Parameters Introduction
When we want to plan EPT for LTE sites, we usually have 2 steps: 1. prepare parameters for planning; 2. use software to plan essential parameters;
*can we plan parameters manually?
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LTE RF Parameters Introduction
We have lots of parameters for 1 site. Which parameters we need to plan & check for every site?
Site name
eNodeB ID
Coordinate
Sector number
Antenna gain
Azimuth
PA:PB
MCC
MNC
Cell radius
Rs power
Transmission Mode
Frequency band
DL/UL frequceny
Bandwith
Min root sequence index
PCI
TAC/TAL
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Mechanical Downtilt Electrical Downtilt
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Height
LTE RF Parameters Introduction The following parameters are confirmed by customer at the beginning of the project MCC MNC Cell radius
Site name
eNodeB ID Coordinate
Sector Mechanical number Downtilt
Electrical Downtilt
Height
Cell radius
Rs power
PCI
TAC/TAL
PA:PB RS power
Antenna gain Azimuth
PA:PB
MCC
MNC
Frequceny band DL/UL frequency bandwith Transmission
Min root Transmission Frequency DL/UL Bandwith sequence Mode band frequceny index
Mode HUAWEI TECHNOLOGIES CO., LTD.
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LTE RF Parameters Introduction
The following parameters are confirmed as the input of cell parameter planning: Site name eNodeB ID
Site name
Coordinate
eNodeB Coordinat Sector Mechanical ID e number Downtilt
Electrical Downtilt
Height
Cell radius
Rs power
PCI
TAC/TAL
Sector number Mechanical Downtilt
Antenna gain
Azimuth
PA:PB
MCC
MNC
Electrical Downtilt Height Antenna gain
Min root Transmissi Frequenc DL/UL Bandwi sequence on Mode y band frequceny th index
Azimuth HUAWEI TECHNOLOGIES CO., LTD.
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LTE RF Parameters Introduction
The followings are key parameters that we need to plan: PCI Min root sequency index(PRACH) TAC/TAL
Site name
Sector eNodeB Coordin Mechanic Electrical numb Height ID ate al Downtilt Downtilt er
Basic planning principles for these parameters:
PCI: avoid collision & confusion PRACH: avoid collision
Antenna Azimuth PA:PB MCC gain
MNC
Cell radius
Rs power
PCI
TAC/TA L
TAC/TAL: keep the edge of TAC area same with 2G/3G LAC area, TAC/TAL should beTransmis Freque DL/UL Band Min root sion ncy frequce sequence with Mode band ny index configured in CN in advance. HUAWEI TECHNOLOGIES CO., LTD.
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Content LTE RF Parameters Introduction PCI/PRACH Planning with U-net Coverage Simulation with U-net Neighbor Planning with SmartRNO Parameter Planning Manually TAC/TAL Planning Manually PCI/PRACH Planning Manually
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What is PCI
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PCI Planning Principle
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PCI Planning Principle
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PCI Planning Principle
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PRACH Planning Principle
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PCI/PRACH Planning with U-net
Normally we use U-net to plan PCI/PRACH. This software has lots of function, in this course we only talk about the 4G EPT planning part. When we need to use U-net to plan parameters, we need to prepare 3 excel files for this software: Site
Site
Transceiver_simcell_simplified plified
Trasciever Cell
Transceiver_full
Normally we use simplified excel files. The full file is more complex.
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cell_full
PCI/PRACH Planning with U-net
After we prepared the 3 files, we can start to plan parameters with U-net.
1.Build a new project with LTE-FDD template, or open an existed project
2.Import electronic maps
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3.Import site list, transceiver list and cell list
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PCI/PRACH Planning with U-net
4. Double check the following parameters: Transceiver: Antenna Cell: Frequency Band, Max Power, PB, RS Power, Prach Reuse Distance, PCI Reuse Distance, PA, Transmission Mode. *the default reuse tier of PCI & PRACH is 2. Normally this is not enough. We’d better use reuse tier 3 or 4. HUAWEI TECHNOLOGIES CO., LTD.
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PCI/PRACH Planning with U-net
5.Neighbour planning.
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PCI/PRACH Planning with U-net
6. PCI planning. Confirm the available PCI value range(for example 0-494).
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PCI/PRACH Planning with U-net
7. PRACH planning. Confirm the available PRACH value range(for example 0-802).
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PCI/PRACH Planning with U-net
8.Check the result. All cells have been assigned PCI & PRACH or not? The reuse distance is correct or not? HUAWEI TECHNOLOGIES CO., LTD.
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Content LTE RF Parameters Introduction PCI/PRACH Planning with U-net Coverage Simulation with U-net Neighbor Planning with SmartRNO Parameter Planning Manually TAC/TAL Planning Manually PCI/PRACH Planning Manually
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Coverage Simulation with U-net
After we prepared the 3 files, we can start to simulate LTE coverage.
1.Build a new project with LTE-FDD template, or open an existed project
2.Import electronic maps
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3.Import site list, transceiver list and cell list
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Coverage Simulation with U-net
4. Double check the following parameters: Transceiver: Antenna Cell: Frequency Band, Max Power, PB, RS Power, Main Propagation Model, PA, Transmission Mode, *the reuse distance and tier of PCI and PRACH is not important in coverage simulation.
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Coverage Simulation with U-net
5. Select the region for coverage simulation.
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Coverage Simulation with U-net
6. Choose the simulation type. Normally we use default parameters for simulation.
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Coverage Simulation with U-net
7. Define the rule of display legend, then check the result of simulation.
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Content LTE RF Parameters Introduction PCI/PRACH Planning with U-net Coverage Simulation with U-net Neighbor Planning with SmartRNO Parameter Planning Manually TAC/TAL Planning Manually PCI/PRACH Planning Manually
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Neighbor Planning with SmartRNO
Normally we use SmartRNO to plan neighbours and output scripts. This software has lots of function, in this course we only talk about the neighbour planning part. When we need to use SmartRNO to plan neighbours, we need to prepare engineering parameters for it. 2G EPT 3G EPT 4G EPT
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Neighbor Planning with SmartRNO
1.Import EPT.
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2. Match the parameters.
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Neighbor Planning with SmartRNO
3.Display cells in map.
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4. Set rules for neighbour palnning.
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Neighbor Planning with SmartRNO
5.Select cells and plan neighbours.
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Neighbor Planning with SmartRNO
6.Save & output results, then check the scripts. HUAWEI TECHNOLOGIES CO., LTD.
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Content LTE RF Parameters Introduction PCI/PRACH Planning with U-net Coverage Simulation with U-net Neighbor Planning with SmartRNO Parameter Planning Manually TAC/TAL Planning Manually PCI/PRACH Planning Manually
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What is TAC and TAL
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TA Planning Principle
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TAC/TAL Planning Manually
TAC/TAL is a key parameter for LTE. Normally we keep the edge of TAC area same to 2G/3G LAC area. If the LAC of some sites are mixed, we need to suggest our customer to adjust TAC or LAC(rehoming). When we need to plan TAC/TAL for a new site, we have 2 steps: 1.use Mapinfo to show the distribute of eNodeBs. (Google Earth and other software are also recommended)
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TAC/TAL Planning Manually
2.Check the TAC/TAL around the new site. Keep the TAC/TAL same to the sites around it. If the LAC is mixed and the customer reject to adjust TAC/LAC, then the TAC should follow the customer’s request and keep mixed. HUAWEI TECHNOLOGIES CO., LTD.
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Content LTE RF Parameters Introduction PCI/PRACH Planning with U-net Coverage Simulation with U-net Neighbor Planning with SmartRNO Parameter Planning Manually TAC/TAL Planning Manually PCI/PRACH Planning Manually
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PCI/PRACH Planning Manually
According to 3GPP protocol, there are 504 PCI(0-503) and 838 root sequence index(0-837). Normally we will not use all of them in our network. We will remain several PCI and PRACH for mobileshelter. For example, we use PCI 0-494, root sequence index 0-819 for normal eNodeB. Then we have 9 PCI(495-503) and 18 root sequence index (820-837) at leisure. We can apply them in mobileshelters. If 1 mobileshelter have 3 sectors, cell radius is 2km, that means we need assign 1 PCI and 2 root sequence index for 1 sector. Then we can plan PCI and PRACH manually: Cell ID
Cell radius(m)
PCI
PRACH
1
2000
501
832
2
2000
502
834
3
2000
503
836
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