lte rnd using mentum planet

Slide titleIn CAPITALS

44 pt

Slide subtitle 20 pt

LTE RND using mentum planet

Françoise Cuvillier, Senior Solution Architect, Australia


44 pt


Introduction

Slide title 30 pt

Text 18 pt

Bullets level 2-516 pt

›!"# $%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~¡¢£¤¥¦§¨©ª«¬®¯°±²³´¶·¸¹º»¼½ÀÁÂÃÄÅÆÇÈËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿĀāĂăąĆćĊċČĎďĐđĒĖėĘęĚěĞğĠġĢģĪīĮįİıĶķĹĺĻļĽľŁłŃńŅņŇňŌŐőŒœŔŕŖŗŘřŚśŞşŠšŢţŤťŪūŮůŰűŲųŴŵŶŷŸŹźŻżŽžƒȘșˆˇ˘˙˚˛˜˝ẀẁẃẄẅỲỳ–—‘’‚“”„†‡•…‰‹›⁄€™−≤≥fifl

Scope and objectives

Objectives

Scope

› General LTE parameter settings

› Throughput settings

› Network Analysis/ Monte Carlo simulations

Upon completion of this cource the student will be able to:

› Set up Planet for LTE

› Understand design requirements

› Perform Network Analysis and Monte Carlo simulations


44 pt


> Overview

Slide title 30 pt

Text 18 pt



Course agenda

› Project data› Network Settings› Environments› Subscriber Settings› Site editor› Network Analysis› Monte Carlo Simulations› Import/Export


44 pt


Project data

Slide title 30 pt

Text 18 pt



Main planet window

MapInfo platform

MapInfo menus Vertical Mapper toolbar

Slide title 30 pt

Text 18 pt



Grid Info

1 value per bin (on each grid)

bin

Slide title 30 pt

Text 18 pt



GEODAta

To obtain geodata or conversion services, contact Geodata Team, [email protected]

Guideline to convert .mrr to .grd/.grc:

http://ericoll.internal.ericsson.com/sites/GKO//Lists/GKO/DispForm.aspx?ID=96048&Source=http://ericoll.internal.ericsson.com/sites/Map_data/

default.aspx

Clutter and Heights

Slide title 30 pt

Text 18 pt



Project dataYou can create traffic maps from population data, live traffic or home made distribution (MapInfo polygons)

You can create areas from MapInfo polygons to be used as simulation areas and to calculate coverage statistics on.

Here is the list of propagation models defined in the project.

Using site sets allow to keep different copy of the site database with different parameter settings

These are the antennas defined in the project

Links are used to represent the losses from feeders, TMA and RBS noise figure.

Slide title 30 pt

Text 18 pt



Link editor

Slide title 30 pt

Text 18 pt



Antenna editor

Slide title 30 pt

Text 18 pt



Antenna editor – Nb of antennas

Slide title 30 pt

Text 18 pt



Propagation Models

Q9 is 9999

Slide title 30 pt

Text 18 pt



Traffic Maps

› You can create traffic maps based on live traffic, or polygons/vectors in MapInfo format (ex: census data mesh blocks). You can apply clutter weightings to show higher density in built up areas.

Census data

Traffic Map


44 pt


Network settings

Slide title 30 pt

Text 18 pt



network settings

Slide title 30 pt

Text 18 pt



Spectrum allocation

Slide title 30 pt

Text 18 pt



› Multi-layered OFDM– Channel-dependent scheduling and link adaptation in time and frequency domain

LTE Channel StructureDL Resource Allocation

DL

time

frequency

User 1User 2User 3

Scheduling unit2 timeslots = 1 TTI

12 sub-carriers

2 timeslots

Resource block1 timeslot = 0.5 ms

Resource element1 sub-carrier

7 OFDM symbols(1 time slot)

12 sub-carriers

1 OFDM symbol

Slide title 30 pt

Text 18 pt



Data rate vs SINR

Slide title 30 pt

Text 18 pt



Planet MCS and AnTenna Algorithms

NoneDL: SIMO 1x2

UL: SIMO 1x2

MCS table At project level Antenna Algorithm At sector level

DL: SISO 1x1

UL: SISO 1x1

UL Diversity gain, DL Diversity gain +

DL MIMO gain + DL AMS threshold

Automatic MIMO Switching

UL SIMO 1x2 Diversity and DL Tx Div 2x2 Diversity gains

Diversity

UL and DL Diversity gains

Diversity

UL and DL Diversity gains

Diversity

DL Tx Div 2x2

DL OLSM 2x2DL SIMO 1x2

(UL SIMO 1x2)

UL Diversity and Diversity gains = 0 dB

DiversityDL: Tx Div 2x2

UL: SIMO 1x2 UL and DL Diversity gains = 0 dB

DiversityDL: Tx Div 2x2

UL: SIMO 1x2 0 dB

Diversity

0 dB

DiversityDL: OLSM 2x2

UL: SIMO 1x2

Slide title 30 pt

Text 18 pt



MCS table - Bits/Symbols vs SINR

See next slides for calculations

C/(N+I) = “SINR”

Slide title 30 pt

Text 18 pt



› We need to convert data rate per RB (data rateRB) expressed in kbps into Useful bits per symbol (bits/symb)

› Given that there are 12 × 7 REs in a RB over 0.5 ms, the conversion formula is:

bits/symb = (data rateRB × 0.5) / [(12 × 7) × (1 – overhead) / 0.93],

where the overhead is found in the frame editor, for 2 Transmit Antennas in the DL, and is equal to 20% in the UL (if Sounding reference signal RB = 0)

Note: the 0.93 factor here is to exclude the Cyclic Prefix from the overhead. We assume that the Normal Cyclic Prefix is used (4.76 µs)

MCS table - Bits/Symbols vs SINR (cont.)

Slide title 30 pt

Text 18 pt



Frame Editor

Slide title 30 pt

Text 18 pt



Antenna Algorithm

› Because we have entered directly the OLSM curve in DL and SIMO in UL in the MCS table we do not need to add any additional MIMO/Diversity gain (gains are already captured in the MCS table).

=> Select the Diversity antenna algorithm at each sector and set the 1x2 and 2x2 gains to 0 dB across all C/(N+I) values

Slide title 30 pt

Text 18 pt



Minimum SINR values

Tick the relevant MCS values in the Base Station Type and

Equipment Type.

Ticking correctly the minimum values is crucial as this will

determine the coverage footprint.

Minimum SINR values are given in the Coverage and Capacity Dimensioning Guidelines for

different channel models.

Slide title 30 pt

Text 18 pt



MCS table EPA5 – Import file

› This is the DL MCS table for EPA5, DL OLSM 2x2, UL SIMO 1x2 that you can import directly into Planet (Data → Import → Project Data)

230811_MCS_EPA5_DL-OLSM2x2_UL-SIMO_Div al

Slide title 30 pt

Text 18 pt



TxDiv or SIMO in the DL

› What we have shown so far was how to set up the MCS table and Antenna Algorithm for OLSM 2x2 in the DL and SIMO 1x2 in the UL

› In case all sites are doing Tx Div 2x2 instead of OLSM 2x2 in the DL:

- enter the Tx Div 2x2 curve in Planet’s MCS table

- select the Diversity Antenna Algorithm at each sector (same)

- set the 2x2 gain to 0 across all C/(N+I) values (same)

› In case all sites are doing SIMO 1x2 in the DL:

- enter the SIMO 1x2 curve in Planet’s MCS table (use the overhead for 1 TX antenna when calculating bits/symbol)

- select the Antenna Algorithm “None” at each sector

› Note: when the “MIMO” Antenna Algorithm is selected instead of “Diversity”, Planet removes 3 dB from the raw SINR before computing the data rate (if 2 Tx antennas).


44 pt


Environments

Slide title 30 pt

Text 18 pt



Cell edge proba in Network Analysis wizard window or in Services QoS in MC simulations

Environments

LNF margin=

f (cell edge proba, Std dev)

Building Penetration

Loss

Not used by Planet for LTE


44 pt


Subscribers settings

Slide title 30 pt

Text 18 pt



Equipment type (cont.)

Slide title 30 pt

Text 18 pt



Subscriber settings – Equipment type

Slide title 30 pt

Text 18 pt



Lte Analyses

There are two types of LTE analyses in Planet:

Network Analysis is a static analysis, used to generate plots. The DL cell load and UL noise rise are inputs.

Monte Carlo simulations are based on detailed traffic data, where multiple trials are run. At each trial subscribers are spread on the map following a Poisson distribution. At the end of the simulations statistics reports are generated. The DL cell load and UL noise rise are outputs of Monte Carlo simulations and can subsequently be used in the Network Analysis to generate plots.

MC simulations are time consuming and difficult to set up and analyze it is recommended to only use Network Analysis in the design

Slide title 30 pt

Text 18 pt



Subscriber settings - Services

Specify here the traffic per user in Erlangs

The MC algo will first try to allocate the Minimum data rate to the users in order of priority. Once done, it will allocate the remaining resources until the users reach their Maximum data rate or no more resources are left (the way resources are allocated depends on the chosen scheduler).

50% means LNF margin = 0 dB.

Only used in Monte Carlo simulations

Slide title 30 pt

Text 18 pt



Subscriber Type

Only used in MC


44 pt


Site editor

Slide title 30 pt

Text 18 pt



Sites/overlay

Slide title 30 pt

Text 18 pt



Automatic Site PlacementPropagation model criterion

Traffic and Site criterion

Concentrate sites where subscribers are

Basic: Simple hexagons

Slide title 30 pt

Text 18 pt



Site editor

Specify which antenna algorithm to use.

Propagation model

Prediction distance

Slide title 30 pt

Text 18 pt



Cell-specific Reference Signals

› Reference Signals are used by the UE for channel estimation to enable coherent detection

› One reference signal per antenna port– 1, 2, or 4 antenna ports supported

› Half of Reference Signal REs transmitting, other half silent at each symbol time => “power recycling”

Antenna port #1

Antenna port #2

Time

Frequency

Slide title 30 pt

Text 18 pt



Sector Editor - Powers

Combined power: 40W, that is 2 RUs at 20W (MIMO)

23 dB delta

= 10log ( 2 REs *2 ant *50 RBs)

= (40W / (12 subcarriers *50RBs)) in dBm

10 MHz example

Data RE

Slide title 30 pt

Text 18 pt



Sector Editor - Configuration

ICIC

PCID = [0...503], Physical cell ID is a combination of:

• Physical layer cell ID group = [0..167] from SSS

•Physical layer identity= [0..2] from PSS

Bad PCI planning will impact Reference Signal SINRWhen neighbour signal is 3dB

better than best server, then HO


44 pt


Network analysis

Slide title 30 pt

Text 18 pt



RF design input requirements

› Spectrum and bandwidth › Area to be covered› Traffic profile per average subscriber and subscriber distribution› Indoor or Outdoor coverage, with desired area coverage

probability › RF design targets: they are typically specified in term of minimum

RSRP threshold, and/or minimum SINR, and/or minimum bit rate at cell edge

› Use of TMAs, filters, RRUs or other operator specific configuration requirements

=> first do a dimensioning using RNPT

Slide title 30 pt

Text 18 pt



Network Analysis

It is recommended to use 50% cell edge probability (i.e. LNF margin = 0 dB) for Capacity analysis purposes. Throughput values will be given as median values.

Cell edge probability > 50% may be used for coverage analysis purposes.

Slide title 30 pt

Text 18 pt



Network Analysis (cont.)

Used in the calculations of DL cochannel interference. PoC depends on the cell loading

Higher P0 means higher cell throughput but also higher noise rise.

Used for the “Reference

Coverage Probability” plot

Slide title 30 pt

Text 18 pt



Nb of UL RB per user (all vs 2)

Affects UL SINR:

less RBs/sub => UE concentrates its power on less RBs => extend coverage but reduce data rate. All RBs

2 RBs

Slide title 30 pt

Text 18 pt



Per RE

Over whole band

LNF, FF,

Div/MIMO gain

No LNF, No FF,

No Div/Mimo gain

PLOTS

Slide title 30 pt

Text 18 pt



NW analysis – DL Max Achievable Bit Rate

Slide title 30 pt

Text 18 pt



Slide title 30 pt

Text 18 pt



Delta plots› You can do delta between plots. You can also apply formulas on the plots.

Bit rate delta between 50% DL load plot and 100% DL load plot

Slide title 30 pt

Text 18 pt



Best server

LAYER STATISTICS

Export to Excel

Produce pdf, cdf graphs

Population/subs. covered per cell


44 pt


Monte carlo simulations

Slide title 30 pt

Text 18 pt



Monte Carlo Simulation Wizard

Slide title 30 pt

Text 18 pt



Discrete subs

Not served due to Ref Coverage

(ReferenceSignaldBm < target)

≠ RSRP!

Slide title 30 pt

Text 18 pt



Monte Carlo Stats reports

Slide title 30 pt

Text 18 pt



MC report – Subscribers/Global

~ 2% of Subs are “Not served” in this example

From RSRP/RSRQ thresholds in MC simulations wizard window

Blocking reasons

From Sector Editor – Implementation tab

From Minimum SINR values

#REs available for data has been reached

From site editor

Slide title 30 pt

Text 18 pt



MC report – Throughput/Sector/carrierDL Cell throughput = Nb served users * Av DL Data Rate By Served Subscriber * AF


44 pt


Import/export

Slide title 30 pt

Text 18 pt



Import/export

Export

Import


44 pt


#Summary

Slide title 30 pt

Text 18 pt



Summary

› Planet is based on MapInfo and Vertical Mapper

› Don’t use Planet Default MCS table and

Diversity/Mimo gains. Too optimistic!

› This presentation explained how to set up the MCS

table in Planet based on the Coverage and Capacity

guidelines throughput curves

› Some plots don’t contain LNF/Diversity/Mimo gain

and some do

Slide title 30 pt

Text 18 pt



More Information

› Planet LTE FDD User Guide and online help (press F1 on any

Planet window to get specific info)

› Coverage and Capacity Dimensioning guidelines in CPI

store: (link)

› Control Channel Dimensioning guidelines in CPI store: (link

)

› RNPT tool and dimensioning guides: (link)

› Guideline for use of Planet in LTE Design (to be published

soon): (link)

Slide title 30 pt

Text 18 pt



Slide title 30 pt

Text 18 pt



Evaluation form in Centra

After each webcast, the participants must fill out the evalutaion form.

The evaluation form should be added as the last slide after the presentation. You can download the prepared saz-file on your PC and insert in Agenda Builder when you set up your session. You can choose to build the evalutation form yourself; then you must use the questions and scoring alternatives listed in the next slide.

For help on creating the evaluation in Centra please click on this Centra link , which you also find in the Instructor’s Guide.

Slide title 30 pt

Text 18 pt



Evaluation formThe course evaluation must be created when building the Centra session using Agenda Builder. In Centra, you choose the option ”Add Survey” to design the

questions.

1. How do you rate the course as a whole?2. How do you rate the presentation material?3. How do you rate the instructor?4. How valuable is this course to you in your daily work?5. To what extent has the course objectives been met?6. Additional comments?

Questions 1 – 5 should be multiple choice answers with the six alternatives shown below:1 Very dissatisfied 4 Relatively satisfied2 Dissatisfied 5 Satisfied3 Somewhat dissatisfied 6 Very Satisfied

Question 6 should have a free-text answer to allow the respondent to use his or her own words.

For help on creating the survey in Centra please refer to the Centra link also find in the Instructor’s Guide

Remove this slide beforeuploading in Agenda Builder

lte rnd using mentum planet

Documents