LTE 1800MHz Band

Re-farming Trial Case

at Indosat

Toni Pribadi

Head of Technology Planning

PT. Indosat Tbk

LTE Asia Conference

Singapore 6-7 September 2011

2

Agenda

LTE 1800 Ecosystem

Indosat LTE Trial 1800

Summary and Next Plan

3

LTE Current Worldwide Ecosystem

15% LTE Network is operating in 1800 MHz

16 LTE Devices ready support LTE 1800 MHz

LTE Network Live or in Deployment : 110

Source : Alcatel – Lucent Analysis, June 2011

Source : GSA Report : Status of the LTE Ecosystem, July 29,

2011

1%

15%

8%

2%

37%

2%

2%

5%

3%

1%

1%

8%

4%

9%

2%

6%

10%

6%

14%

2%

2%

27%

20%

10%

2%

1%

Total Current Device Model 161

Proportional LTE Device Band Support

700MHz

AT&T, 20%

800 MHz

EDD, 10%1800 MHz,

10%

700MHz

VzW, 27%

2.6 GHz, 14%

AWS, 6%

1 : 2100 Mhz3 : 1800 MHz

4 : AWS7 : 2.6 GHz8 : 900 MHz11 : 1500 MHz Japan12 : 700MHz VzW13 : 700MHz AT&T20 : 800 MHz EDD40 : 2.3 GHz TDD38 : 2.5 Ghz TDD

Proportional LTE Networks by Frequency Band

800 MHz

2.6 GHz

37%

1800 MHz

15%

2.3 GHz

TDD

1 : 2100 Mhz3 : 1800 MHz4 : AWS5 : 850MHz7 : 2.6 GHz8 : 900 MHz11 : 1500 MHz Japan12 : 700MHz lowAC13 : 700MHz upC17 : 700MHz lowC19 : 850MHz Japan20 : 800 MHz EDD38 : 2.6 Ghz TDD40 : 2.3 GHz TDD41 : 2.5 GHz TDD

Second largest

Ecosystem of LTE

- GSM Evolution

4

More Operators Commit to LTE 1800

5

Current LTE Spectrum in Indonesia (1)

700 MHz

900 MHz

800 MHz

518 798

ANALOG TV BROADCAST

Digital Switchover : TV Digital implementation plan, 2018 for major Big Cities

6

1800 MHz

2300 MHz

2600 MHz

Current LTE Spectrum in Indonesia (2)

2300

WiMAX 802.16d (15 zone) USO TelkomselWill be Auctioned

2360 2390 2400

Indonesian regulatory has not allocated specific frequency band for LTE

1800 is the most possible for re-farming

Technology agnostic should be applied in conjunction to new frequency

fee scheme

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Ecosystem Re-farming Frequency for

LTE 1800GSM 900 DCS 1800 UMTS

2100

Subscriber Subs

Market

Share

15 MHz 5 MHz 9.5 Million 4.6%

10 MHz 20 MHz 10 MHz 42 Million 20.5%

7.5 MHz 22.5 MHz 10 MHz 95 Million 46.3%

10 MHz 5 MHz 12.5 Million 6.1%

7.5 MHz 7.5 MHz 10 MHz 40.1 Million 19.6%

Total Mobile Subs around 205 M YE 2010.

1800 re-farming will be preferable by two operators that have 67% market share

Source: company report

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Agenda

LTE 1800 Ecosystem

Indosat LTE Trial 1800

Summary and Next Plan

Re-farming Process for Hot Spot LTE

Examining Adjacent Interference

Examining Co-Channel Interference

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Trial Objectives

• Promote to regulatory that Indosat is ready to

refarm existing 1800 freq for LTE

• Leading Indonesia Mobile Broadband

technology

• Gain experience with LTE in terms of

performance, latency, RF behavior, and end-

to-end functionality.

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Indosat LTE 1800 Trial Environment

1.Non – commercial trial in building in two cities:

i. eNode B NSN FMR 1/1/0, 2x2 MIMO

ii. MME, S-GW/P-GW, HSS Emulator

iii. User Equipment: BandLuxe C501

2.10 MHz 1800 Frequency, FDD, ARFCN 736-786:

i. 1755 – 1765 MHz UL

ii. 1850 – 1860 MHz DL

BandLuxe C 501, LTE Cat 3,

2x2 MIMO, DL 100 Mbps 64

QAM , UL 50 Mbps 16 QAM

MPLS

MME

Serving-GW /PDN-GW

InterneteNodeB-Surabaya

eNodeB-Bali

HSS

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Re-farming 1800 MHz Frequency

for Hot Spot LTE (in building)

4 km

Re-farming Process:

1. Determine target KPI :

• LTE SINR: 25

2. Scanning for LTE

frequency band.

3. Turn on LTE eNodeB.

• Measure SINR target.

4. Gradually clear the

surrounding BTS from 10

MHz used by LTE

• Frequency clearance

up to 4 km from LTE

hot spot

SINR 25 is achieved after clearance within 4 km in this area (urban area).

The same Frequency 1800 block may be re-used out side 4 km radius.

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Test Result

LTE Transmission Bandwidth

LTE Channel Bandwidth = 10.0 MHz

LTE Transmission Bandwidth = 9.0 MHz

(i.e. [1850.5 – 1859.5] MHz)

3GPP TS 36.101

LTE 10.0 MHz

5 MHz

4.5 MHz

0.5 MHz

RB

RB

RB

RB

RB

180kHz

Transmission Bandwidth (nRB x 180kHz)

foffset

2G-LTE Carrier Spacing

100kHz

Channel Bandwidth

1.4 3.0 5.0 10.0 15.0 20.0

1.08 2.7 4.5 9.0 13.5 18.0

Channel bandwidth (MHz)

Transmission bandwidth (MHz)

LTE Transmission bandwidth configuration

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Test Result

Co-channel Interference

LTE needs more clean spectrum

Interference planning and RF

optimization is a must-do

-30

-20

-10

0

10

20

30

0 10 20 30 40 50 60 70 80

2G

-SQ

I

LTE - DL Throughput (Mbps)

After, LTE EIRP 10mW, DCS BTS 20W After, LTE EIRP 6mW, DCS BTS 20W

After, LTE EIRP 6mW, DCS BTS 12W

Good Average Poor

UELTE

MSDCS

UELTE

MSDCS

UELTE

MSDCS

LTE E NODE B

DCSBTS

Good Average Poor

UELTE

MSDCS

UELTE

MSDCS

UELTE

MSDCS

LTE E NODE B

DCSBTS

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Test Result

Adjacent Channel Interference

In this hot spot scenario, It requires at least 200 KHz guard band with GSM system

to maintain DL performance and DCS SQI

Uplink performance remain constant.

0

10

20

30

40

50

60

70

80

-5 0 5 10 15 20 25 30SINR (dB)

DL

Thro

ugh

pu

t (M

bp

s)

Before Interference After, No Guard Band

After, 200 KHz Guard Band After, 400 KHz Guard Band

0

2

46

8

10

12

1416

18

20

-5 0 5 10 15 20 25 30SINR (dB)

UL

Thro

ugh

pu

t (M

bp

s)

Before Interference After, No Guard Band

After, 200 KHz Guard Band After, 400 KHz Guard Band

With SINR maintain in good level above 20:

Good Average Poor

UE

LTE

MS

DCS

UE

LTE

MS

DCS

UE

LTE

MS

DCS

LTE

E NODE B

DCS

BTS

Good Average Poor

UE

LTE

MS

DCS

UE

LTE

MS

DCS

UE

LTE

MS

DCS

LTE

E NODE B

DCS

BTS

SINRDL Tput

Mbps%

maintain

UL Tput

Mbps

%

maintain

2G

SQI

Before Interference 26.46 71.47 100% 18.70 100% -NO Guard Band 26.64 56.18 79% 18.69 100% 16.05200 KHz Guard Band 26.54 68.64 96% 18.70 100% 18.51400 KHz Guard Band 27.06 71.40 100% 18.70 100% 19.32

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Test Result

Throughput & Latency

Test SINR Result

Single User Throughput

Download

26.1 Avg. 71 Mbps

Single User Throughput

Upload

29.4 Avg. 17 Mbps

Cell Throughput (2 users) 22 – 25 Total 70 Mbps

Cell Throughput (4 users) 20 – 25 Total 65 Mbps

Latency 23 ms

User SINR is impacted by own cell load. The more the number of

users in the cell, the more is the interference thus affecting total cell

throughput. further investigation

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Agenda

LTE 1800 Ecosystem

Indosat LTE Trial 1800

Summary and Next Plan

17

Summary and Next Plan

Next Plan

• Further exploration of RF characteristics: macro, dense urban

• Business feasibility of LTE re-farming: deployment strategy, cost

analysis, application

• Indosat will promote 1800 as LTE re-farming spectrum

Summary

1. LTE in 1800 MHz is promising ecosystem in Indonesia.

2. Gradual re-farming process can be done quickly by understanding the

boundaries of re-farming distance radius.

3. LTE needs cleaner spectrum. Interference planning and RF

optimization is a must-do.

4. Guard band is proposed to maintain LTE DL performance and 2G SQI.

As the result of this trial, at least 200KHz guard band is needed.

5. LTE re-farming is a potential strategy for Indosat.

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About Indosat as a Total Solution Provider

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Pre Paid :- Mentari

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Wireless Broadband

3.5G

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Fixed Phone:-StarOne (Fixed Wireless

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Connectivity

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Enterprise & SME

Solution

Data Centre

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-ISPL

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Thank you