module 3-lte rnp rno procedure

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LTE RF Planning & Optimization Procedure

Section-1


Contents LTE Planning

Charter 1 LTE Network Planning

----- Frequency Planning

----- Coverage Planning

----- Capacity Planning

Charter 2 LTE RNP Solutions

Page 2


Frequency Reuse 1*3*1

Page 3


SFR (Soft Frequency Reuse)1*3*1

Page 4


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

Page 5


Frequency reuse mode 1*3*3

Page 6







Page 7


Link Budget Procedure

Page 8


Link Budget Model: Uplink

Page 9


Link Budget Model: Downlink

Page 10


Link Budget Principle

Page 11


MAPL Calculation Process

Page 12


Coverage Planning Comparison LTE/CDMA /WiMAX

Page 13







Page 14


Capacity Analysis Concept

Page 15


Capacity Estimation Realization Process

Page 16


Key performance baseline

Page 17


LTE TA Planning

Page 18

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 procedure. 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.


Network Scenario 1 Los Angeles

Page 19

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.


TA Planning Solution

Page 20


Network Scenario 2 London

Page 21

In this scenario, users are average

distributed in each area


TA Planning Solution

Page 22


Rules TA Planning

Page 23

-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.


Rules TA Planning (contd)

Page 24


Neighbor Cell Planning

Page 25


ANR & Neighbor Cell Planning

Page 26


PCI Planning

Page 27


Scrambling Overview

Page 28

PCI: Physical Cell ID, is used to generate

scrambling code to identify the different cell


Scrambling Overview (Contd)

Page 29


PCI Planning Principle

Page 30

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.


Reference Signal in LTE

Page 31



Page 32


Example of cross antenna interference

Page 33



Page 34


PCI Planning Modulo 3

Page 35


Cyclic Prefix Size Decision

Page 36

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.


Cyclic Prefix Size Decision (contd)

Page 37

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.


Cyclic Prefix Size Decision (contd)

Page 38

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 Decision

Page 39

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 Decision (Contd)

Page 40

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

Extended Cell Access Radius feature.


U2000 Parameter

Page 41


Preamble Format & PRACH Configuration Index

Page 42


Config Index

Page 43


Root Sequence Index Planning

Page 44

* 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.


PRACH Parameters

Page 45

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


NCS Selection

Page 46


Calculation Max Cell Radius for given Ncs

Page 47


Table Calculation

Page 48


Ncs Selection Example

Page 49


Addition TD-LTE Planning

Page 50


Addition TD-LTE Planning (Contd)

Page 51


Contents LTE Optimization


RF Optimization in Site Rollout Flowchart


LTE RF Optimization Objects


RSRP (Referense Signal Received Power) and SINR (Signal to Interference plus Noise Ratio)


RF Optimization recommend baseline


RF Optimization Methods


RF Optimization Flowchart


Contents


Technical Knowledge and Tool Preparation


Pre-condition and start for RF Optimization


Preparations for RF Optimization


Contents


Classification of Coverage Problems (RSRP)


Factors Affecting Coverage


Resolving Weak Coverage


Case : Find Weak Coverage Area by Scanner or Drive Tests


Lack of a Dominant Cell


Resolving Prblems with Lack of a Dominant Cell


Case : An Area Without a Dominant Cell


Cross Coverage


Resolving Cross Coverage Problems


Case : Cross Coverage Caused by Improper Tilt Settings


Case-Reverse Connection of The Antenna


Contents


Signal Quality (SINR is mainly involved)


Resolving Signal Quality Problems Caused by Improper Parameter Settings


Case : Adjusting Antenna Azimuths and Tilts to Reduce Interference


Case : Changing PCIs of Intra-frequency Cells to Reduce Interference


Case : Handover Failure Caused by Severe Interference


Drive Test Route & Justification

Page 82

Each blocking access should be proven by

photo and match with actual condition

(Google Street View)


Baseline Drive Test

Page 83

RSRP

SINR


Bad Spot Analysist (Weak Coverage)

Page 84

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

Page 85

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

Page 86


Bad Spot Analysist (Cross Coverage)

There is overshoot from site Soepomo Dalam need to adjut

M.Tilt

More LOS

Menteng Dalam M-S-GF

Soepomo Dalam Mc-S-GF


Soepomo Dalam Mc-S-GF (TA)

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

Menteng Dalam M-S-GF (TA)

Bad Spot Analysist (Cross Coverage)

After Reducing Coverage of Soepomo Dalam


Bad Spot Analysis (Too Dominant PCI)

Page 89

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)

Page 90

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

Page 91

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.

www.DigiTrainee.com Company ConfidentialPage 92

Cross Feeder Analysist


Overview of X-Feeder Troubleshoot

Page 93

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 exact

rule 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

Page 94


Sector 2

Page 95


Sector 3

Page 96


Mapping Problem & Troubleshoot

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.

Page 97


Contents


Handover issue with coverage


Handover Problem Analysis

Page 100


Case: Service Drops Caused by MissingNeighboring Cell Configuration

Page 101


Summary

Page 102

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module 3-lte rnp rno procedure

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