IMPROVING THE MOBILE EXPERIENCE WORLDWIDE

R.T.W.P Investigation Region M

Ray Khastur

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1. Overview

2. Border Site Monitoring

3. Investigation Highest RTWP Site

4. OSS Monitoring

5. Summary

Agenda

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Out-Band Emission

Study Case on Region M

TD-LTE

15MWiMAX

5M

WiMAX

5M

WiMAX

5M

External

Source-FDD

Local ISP

Spurious Emission from Left Side Band Spurious Emission from WiMAX Spurious Emission from LTE

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Overview : Suspect External Interference from Local ISP

The Local Internet Service Provider in M region is detected also use Band 2300 to 2400 as their allocation also (illegal). Because on Indonesia Communication and Information Minister already allocated Band 2.3 GHz only use for Broadband Wireless Access operator such as First Media, Berca, Internux, Indosat M2, Telkom and Jasnita as the winner of bidding spectrum allocation owner ship in specific region.

One wireless device that many ISP used is MikroTik wireless communication that can arrange the frequency randomly based on time.

So between day time and night time they can shifted their frequency to be undetected on specific location. The reason is to manipulated scanning activity from BWA operator and also the government institution.

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Overview : MikroTik Wireless Communication System 2.3 GHz

http://www.itelite.net/offer.php?n=69&lang=en

http://www.itelite.net/offer.php?n=80&lang=en

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Overview: Existing TDD Configuration

UL = 18 Symbols = 1851.43 usDL = 29 Symbols = 2982.86 us UL = 18 Symbols = 1851.43 us

TTG = 105.715us RTG=60us

WiMAX 16e

29:18

DLULDL DwPTS(10 os)

TD- LTE 3:1

SSP : 10:2:2

UpPTS(2 OS)

TUD

DL DL

Interference Interference

Interference WiMAX

to TD-LTE

Interference TD-LTE

to WiMAX

To determine TDD Interference from Intra LTE:

•The power receiving strength for the first UL subframes 0 and 6 is used to differentiate TDD long-distance

interference.

•The power receiving strength for the last UL subframes 0 and 12 is used to differentiate interference

caused by GPS clock loss.

In current condition due to there are two kind of external interference (WiMAX and Local ISP), From above

picture showing All UL Symbol of LTE System will have suffered tdd interference from WiMAX Operator. And

also the MikroTik transmiter will also interferer DL and UL every time due to use FDD Technology.

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Border Site of Monitoring

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Border Site of Monitoring: Border 1

Border 1 on the North City of M, we can see the direction of Interference is coming from South area.

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Border Site of Monitoring: Border 2

Border 2 on the Center City of M, we can see the direction of Interference is facing to the marked area and

also there are terrestrial link pattern that connecting west M to the inner city

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Border Site of Monitoring: Border 3

Border 3 on the South City of M, we can see the direction of Interference is going to the Border 2 area.

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Border Site of Monitoring: Border 4

Border 4 on the East City of M, we can see the direction of Interference is going to the Border 2 area.

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Investigation Highest RTWP Site

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Investigation Highest RTWP Site:

RTWP Tracing Site 31131_Prapat 54 M-P-RT_2

Inband Emission 1

Inband Emission 2

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Investigation Highest RTWP Site:

RTWP Tracing Site 31601_Ksatria Barat M-P-RT_3

Inband Emission 1

Inband Emission 2

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Investigation Highest RTWP Site:

RTWP Tracing Site 31043_Gatot Subroto M-P-RT_1

Inband Emission 1

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OSS Monitoring : 31131

UL and DL Throughput can’t reach the peak performance

even there is only few subscriber.

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OSS Monitoring : 31601

UL and DL Throughput can’t reach the peak performance

even there is only few subscriber.

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• There are two kinds of external source on M Region, from WiMAX Operator (TDD Technology) and also

from Local ISP with Wireless MikroTik (FDD Technology). On current situation our huge interferer is

coming from Local ISP than WiMAX Operator. Strongly recommended to solve Local ISP problem need

to be clear.

• Interference issue will affected with many KPI for achieve the target and also have bad user experience

perspective with B Operator LTE Services. (Attach Detach, RRC, eRAB, Service Drop Rate, Intra Freq

HOSR, Latency {Attach Time Delay and Ping} and and Throughput as well)

• With adjacent Band Frequency with WiMAX operator, proper TDD Ratio configuration need to be set up

properly to prevent any TDD Interference and also TDD Ratio configuration will determine the

Throughput achieved.

Summary