LTE-Parameter Planning.pdf

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LTE Cell Parameter Planning NA NPS RSRC: Huhao September.2015

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

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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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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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


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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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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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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What is PCI


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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


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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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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5.Neighbour planning.


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6. PCI planning. Confirm the available PCI value range(for example 0-494).


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7. PRACH planning. Confirm the available PRACH value range(for example 0-802).


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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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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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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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5. Select the region for coverage simulation.


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6. Choose the simulation type. Normally we use default parameters for simulation.


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7. Define the rule of display legend, then check the result of simulation.


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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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1.Import EPT.


2. Match the parameters.

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3.Display cells in map.


4. Set rules for neighbour palnning.

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5.Select cells and plan neighbours.


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6.Save & output results, then check the scripts. HUAWEI TECHNOLOGIES CO., LTD.

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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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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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LTE-Parameter Planning.pdf

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