3 lte rnprnoprocedure 160229102648

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www.DigiTrainee.com Company Confidential

LTE RF Planning & OptimizationProcedure

Section-1


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Contents LTE Planning

Charter 1 LTE Network Planning

----- Frequency Planning

----- Coverage Planning

----- Capacity Planning

Charter 2 LTE RNP Solutions

Page 2


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Frequency Reuse 1*3*1

Page 3


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SFR (Soft Frequency Reuse)1*3*1

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SFR 1*3*1 Vs FFR 1*3*1

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Frequency reuse mode 1*3*3

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Link Budget Procedure

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Link Budget Model: Uplink

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Link Budget Model: Downlink

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Link Budget Principle

Page 11


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MAPL Calculation Process

Page 12


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Coverage Planning Comparison LTE/CDMA /WiMAX

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Page 14


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Capacity Analysis Concept

Page 15


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Capacity Estimation RealizationProcess

Page 16


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Key performance baseline

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LTE TA Planning

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TA: Similar to the location area and routing area in 2G/3G networks, the tracking area (TA) is used for paging. TA planning aims to reduce location update signaling caused by

location changes in the LTE system.

TA list : A list of TAIs that identify the tracking areas that the UE can enter without performing a tracking area updating p rocedure. The TAIs in a TAI list assigned by an MME to a

UE pertain to the same MME area. In LTE system, if an UE changes the TAs in the TAI list, TA update wont be triggered.


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Network Scenario 1 Los Angeles

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In the Los Angles, there are several independent density area that connected by

the main road (like island) . The UE may go across the different area through

this road.


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TA Planning Solution

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Network Scenario 2 London

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In this scenario, users are average

distributed in each area


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TA Planning Solution

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Rules TA Planning

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-A TA coverage should be proper setting according to the capability of

EPC

-When the suburban area and urban area are covered discontinuously, an

independent TA is used for the suburban area.


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Rules TA Planning (contd)

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Neighbor Cell Planning

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ANR & Neighbor Cell Planning

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PCI Planning

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Scrambling Overview

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PCI: Physical Cell ID, is used to generate

scrambling code to identify the different cell


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Scrambling Overview (Contd)

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PCI Planning Principle

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Differences between a scrambling code and a PCI: The scrambling code ranges from 0 to 511 whereas the PCI ranges from 0 to

503. In addition, the protocols do not have specific requirements for scrambling code planning. Therefore, only the reuse distance

needs to be ensured in scrambling code planning. For PCI planning, however, 3GPP protocols require that the value of PCI/3

should be 0, 1, or 2 in each eNB.


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Reference Signal in LTE

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Example of cross antenna


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Example of cross antennainterference

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PCI Planning Modulo 3

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Cyclic Prefix Size Decision

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A CP is a copy of the end of an OFDM symbol to the start position of the

symbol. Each CP generates a guard interval between two OFDM symbols.


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Cyclic Prefix Size Decision (contd)

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A CP is a copy of the end of an OFDM symbol to the start position of the

symbol. Each CP generates a guard interval between two OFDM symbols.


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Cyclic Prefix Size Decision (contd)

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The symbol energy that can be captured by the OFDM receiver depends on the CP length:

If the CP is longer than the multipath delay of an OFDM symbol, the OFDM receiver can capture all energy of the

symbol.

If the CP is shorter than the multipath delay of an OFDM symbol, the OFDM receiver can capture only some

energy of the symbol.

Random Access Preamble Format


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Random Access Preamble FormatDecision

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The random access procedure is used in various scenarios, including initial access, handover, or

re-establishment. Like other 3GPP systems the random access procedure provides a method for

contention and non-contention based access. The PRACH (Physical Random Access Channel)

includes RA (Random Access) preambles generated from ZC (Zadoff-Chu) sequences.

There are five preamble formats defined which four of them are for FDD

Random Access Preamble Format


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Random Access Preamble FormatDecision (Contd)

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Other preamble formats then Format 0 and Format 4 (TDD) are available only with the LOFD-001009

Extended Cell Access Radius feature.


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U2000 Parameter

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Preamble Format & PRACH


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Preamble Format & PRACHConfiguration Index

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Config Index

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Root Sequence Index Planning

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* in fact, with the lowest configuration,

where we assume maximum cell radius of

790m we assign only one value per cell.Further explanation on following slides.


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PRACH Parameters

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PRACH configuration is defined by the following parameters

Root sequence, setting in the eNodeB

Ncs: Automatically setting based on the cell radius configuration

PRACHfrequency offset: Scheduled by eNodeB

High speed flag: Indicate whether the cell is for high speed

All the parameters all carried by SIB Type 2


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NCS Selection

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Calculation Max Cell Radius for


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Calculation Max Cell Radius forgiven Ncs

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Table Calculation

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l i l


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Ncs Selection Example

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ddi i l i


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Addition TD-LTE Planning

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Addi i TD LTE Pl i (C d)


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Addition TD-LTE Planning (Contd)

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Contents LTE Optimization


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Contents LTE Optimization

RF Optimization in Site Rollout Flowchart


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RF Optimization in Site Rollout Flowchart

LTE RF Optimization Objects


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LTE RF Optimization Objects

RSRP (Referense Signal Received Power) and SINR


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( g )(Signal to Interference plus Noise Ratio)

RF Optimization recommend baseline


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RF Optimization recommend baseline

RF Optimization Methods


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RF Optimization Methods

RF Optimization Flowchart


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RF Optimization Flowchart

Contents


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Contents

Technical Knowledge and Tool Preparation


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Technical Knowledge and Tool Preparation

Pre-condition and start for RF Optimization


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Pre-condition and start for RF Optimization

Preparations for RF Optimization


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Preparations for RF Optimization

Contents


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Contents

Classification of Coverage Problems (RSRP)


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Classification of Coverage Problems (RSRP)

Factors Affecting Coverage


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Factors Affecting Coverage

Resolving Weak Coverage


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Resolving Weak Coverage

Case : Find Weak Coverage Area by ScannerD i T


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or Drive Tests

Lack of a Dominant Cell


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Resolving Prblems with Lack of a DominantC ll


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Cell

Case : An Area Without a Dominant Cell


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Case ea t out a o a t Ce

Cross Coverage


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g

Resolving Cross Coverage Problems


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g g

Case : Cross Coverage Caused by ImproperTilt Settings


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Tilt Settings

Case-Reverse Connection of The Antenna


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Contents


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Signal Quality (SINR is mainly involved)


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g Q y ( y )

Resolving Signal Quality Problems Caused byImproper Parameter Settings


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Improper Parameter Settings

Case : Adjusting Antenna Azimuths and Tiltsto Reduce Interference


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to Reduce Interference

Case : Changing PCIs of Intra-frequencyCells to Reduce Interference


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Cells to Reduce Interference

Case : Handover Failure Caused by SevereInterference


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Interference

Drive Test Route & Justification


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www.DigiTrainee.com Company ConfidentialPage 82

Each blocking access should be proven by

photo and match with actual condition

(Google Street View)

Baseline Drive Test


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RSRP

SINR

Bad Spot Analysist (Weak Coverage)


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p y ( g )

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In this bad spot we will re-orientation from site which have LOS condition much better

from Cluster Condet 1 (Site Jalan Pancoran)

Not Yet ON AIR

Hotel High Building

Bad Spot Analyst Contd


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p y

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Not Yet ON AIR

Hotel High Building

Jalan Pancoran Mc-P-GF (TA)

Sect1 (10 Deg to 330

Deg) and Uptilt (-2

M.Tilt)

Sect3 (240 Deg to

230 Deg)

In this bad spot we will re-orientation from site which have LOS condition much better

from Cluster Condet 1 (Site Jalan Pancoran)

Bad Spot Check Result


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p

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Bad Spot Analysist (Cross Coverage)


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There is overshoot from site Soepomo Dalam need to adjut

M.Tilt

More LOS

Menteng Dalam M-S-GF

Soepomo Dalam Mc-S-GF

Bad Spot Analysist (Cross Coverage)


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Soepomo Dalam Mc-S-GF (TA)

Sect1 (+3 M.Tilt)M.Tilt (+3/+6/+4)

Menteng Dalam M-S-GF (TA) After Reducing Coverage of Soepomo Dalam

Bad Spot Analysis (Too Dominant PCI)


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In order to reduce too many dominant PCI across Kota Dalam Sect1 Main Lobe, Site

Tebet Selatan Sect1 will be change direction to Tebet 4

F2

F2

Bad Spot TA Analysis (Too Dominant PCI)


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Kota Dalam Mc-F-GF

Azimuth (340/90/NA)

E.Tilt (+2/+3/NA)Sect3 (220 Degree)

And M.Tilt (-3 Degree)

Tebet Selatan Mc-M-RT

Azimuth (NA/110/230)

M.Tilt (+2/+4/+2)

Abdullah Syafei M-T-RT

M.Tilt (NA/+3/+6)

Asem Baris Mc-P-GF

Tebet 2D Mc-T-GF

Azimuth (340/90/NA)

E.Tilt (+2/+3/NA)

Bad Spot Check Result


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F2

F2

Before After

In order to solve one badspot due to too many dominant PCI, required to re-plan new

azimuth and proper tilt configuration and make one PCI more dominant than before.


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Cross Feeder Analysist

Overview of X-Feeder Troubleshoot


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For LTE Network SON Feature (PCI Optimization), everyday PCI will be changing. So

during drivetest if not following daily Engineering Parameter from system. Common

people will see there is cross feeder issue. Actually on PCI Optimizer there is no exactrule lower number of PCI should be correlated with lower number of Local Cell ID.

The general rule of PCI Optimizer one LTE Site should use same SSS ID, and PSS ID

can be randomly as long the system can arrange not facing with the same PSS ID from

the other site.

Whatever the PCI on the implementation, we should be able to analyze the cell

footprint from LTE Broadcast Channel on SIB Type 1. Which contains PLMN ID,

TAC, eNB ID and the Important thing is Cell ID. Cell ID should following rule

clockwise numbering, from the smaller to the higher.

How to breakdown CellIdentity into Cell ID:

= (28. _) + _

Sector 1


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Sector 2


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Sector 3


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Mapping Problem & Troubleshoot


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After we understand above description, left picture showing actual

condition of Cell ID placement, and we can assign related team to swap

CPRI/Feeder according to condition of cross feeder issue exist.

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Contents


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Handover issue with coverage


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Handover Problem Analysis


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Case: Service Drops Caused by MissingNeighboring Cell Configuration


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g g g

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Summary


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End of Section
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3 lte rnprnoprocedure 160229102648

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