Lteradionetworkplanningtutorialfromis Wireless 120530073459 Phpapp02

LTE Radio Network Planning Tutorial

Copyright by Innovative Solutions. All rights reserved. www.is-wireless.com

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Copyright by Innovative Solutions. All rights reserved. www.is-wireless.com Copyright by IS-Wireless. All rights reserved. www.is-wireless.com

Step 1: Initial planning

Step 2: Detailed planning

Step 3: Parameter planning

Step 4: Verification and acceptance

Roll-out / network optimization / extension

Our scope

of interest

LTE Radio Network Design Overall Picture


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Example: Frequency response

Link Level Simulator

System settings/Environment:

System BW

Channel (CIR, CFR)

Number of Antennas

PAPR, Synchronization, Channel estimation algorithms, etc

Inputs

User allocations

MCS

MIMO operation

User/control data

Outputs

Performance of channel coding/BER

EVM

Performance of algorithms

Visualization (Time and frequency

plots, BER curves, MCS curves:

throughput vs SNIR)

Provides the possibility to adjust/evaluate:

- algorithms of sync, channel estimation,

- application in various channel conditions,

- RF emission, filtering

Channel coding/modulation

Input data

Output.

System settings

Radio Channel

Sync/Estim

Channel decoding Output.

Output.

Tools in the Planning Process Link Level Simulator


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Example: SINR map

RNP Tool


Chosen and tuned propagation models

Chosen and tuned traffic models

Geographical data digital map (elevation, land usage, )

Inputs

Site locations and configuration

Antenna models (patterns)

Available frequencies and BWs

Spectrum reuse method

MCS mapping (from Link Level)

Outputs

Coverage (field strength, Rx power level,

best server)

Capacity (interference, SNIR, data rates)

Visualization (coverage/capacity maps,

statistics)

Usually Static Simulations


- Site locations, powers, spectrum reuse

methods, frequency planning,

- parameter configuration.

Pathloss

Rx_Lev

Best server

C/I

Bit/rates

Network parameters Map

MCS

mapping

Output.

Output.

Output.

Output.

Output.

Tools in the Planning Process RNP Tool


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System Level Simulator


System BW

System parameters configuration (CellIDs, frequencies)

Channel, traffic, user distribution models, etc

Inputs

Coverage (from RNP tool)

Capacity (from RNP tool)

Site location (from RNP tool)

QoS

User positions

RRM algorithms

Outputs

Utilization of resources

Dynamic/Semi-static

coverage/SNIR/Bitrates

Blocked users

Visualization (SNIR/Spectral

efficiency, resource utilization)

Mobility performance

Example: Spectral efficiency

Usually Dynamic Simulations


- different RRM algorithms,

- power control algorithms

- traffic shaping methods,

- interference management schemes

- fade margins, UE power margins

UE position

Random fading

Conn. Est.

Power/datarate

Interference

Input from RNP Traffic demands/QoS

RRM alg.

Output.

Output.

Positio

n a

dju

stm

ent

Tools in the Planning Process System Level Simulator


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1 slot (0.5 ms)

Control Region:

First 1-3 OFDM Symbols in subframe

PCFICH OFDM symbol 0, PHICH OFDM symbol 0 PDCCH the rest

PBCH 4 OFDM symbols (0-3) in slot 1 in subframe 0

Synchronization Signal:

2 OFDM symbols (5-6) in slot 0 and 10

P-SS OFDM symbol 6 in slot 0 and 10 S-SS OFDM symbol 5 in slot 0 and 10

BW

PDSCH rest REs

DC

1 subframe (1 ms)

62

SCs

72

SCs

1 Radio Frame (10 ms)

12 SC

7 OFDM Symbols

RS RE

2 PRB

E-UTRA Radio Frame Downlink

OFDM Subcarrier

OFDM Symbol

Guard Band

for P-SS and S-SS


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BW

R2

R3

R1

Pt

t

f

E-UTRA Resource Allocation OFDMA/SCFDMA Combined with TDMA

TTI=1ms 12x15kH

z


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Link budget

EIRP

Pt

TX

SNIR

N + I

RX

Pr

P_sens

GAINS, LOSSES, MARGINS

Pr = Pt + GAINS - LOSSES - MARGINS

Question: what is the cell

edge criterion?

Distance d

- Max throughput at the cell edge

- Basic connectivity (i.e., lowest possible MCS)

- Ref RX sensitivity requirement

SNIR_min

LTE Link Budget General Rules


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Parameter Value Comment

A Max eNB TX power 46 dBm

B Cable loss 3 dB

C CP loss 1 dB

D eNB antenna gain max 19 dBi

E EIRP max 61 dBm = A B C + D

BW_RX 1.8 MHz

F Noise power -102 dBm

G SNIR_min 5 dB From MCS tables

H UE antenna gain 0 dBi

I Min required RX power -97 dBm = F + G - H

J total path loss 158 dBm = E I

K Other gains, losses, margins - 10 dB Shadowing, fast fading, multiantenna

L Maximum Allowed Propagation Loss 148 dBm = J + K

Cell range 3.5 km

eNB TX

UE RX

LTE Link Budget Example Link Budget in Downlink


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* Omni 2-sectors 3-sectors

Site_area 2.6 * d2 1.3 * d2 1.95 * d2

Intersite_distance 0.87 * d 2* d 1.5 * d

After determiation of cell range (radius) d

we can estimate the site coverage area

GRID

to be entered into the RF Planning tool for verification

* Source: J. Laiho, A. Wacker, T. Novosad, Radio Network Planning and Optimization for UMTS, Wiley, 2002, pp 83

#sites = deployment_area / site_area

LTE Coverage Site Coverage Area and Inter-Site Distance


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Backup slides


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LTE/LTE-Advanced course portfolio List of IS-Wireless courses

Contact Us: Email: [email protected] www.is-wireless.com

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