Indonesian Case in 3G SpectrumIndonesian Case in 3G Spectrum

AZHAR HASYIMDirectorate General of Posts and Telecommunications

Ministry of Communication and Information Technology2005

Agenda

• Spectrum for IMTIMT--20002000 Services• 3G CORE BANDS vs PCS1900 BANDS•• Potential InterferencePotential Interference•• Indonesia 3G SpectrumIndonesia 3G Spectrum• 3G Field Trial

Spectrum for IMTIMT--20002000 Services

• ITU identified core band for terrestrial IMT-2000 services operate in the FDD mode in the bands :

– 1920 - 1980 MHz for mobile stations transmitting (UpLink)

– 2110 - 2170 MHz for base stations transmitting (DownLink)

Competing Standards• ITU setup global standards for third-generation (3G)

wireless communications

• Two of Five standards competing in 3G technology, these are :– WCDMA– CDMA2000

• Compatibility– WCDMA : backward compatible with GSM system – CDMA2000 : backward compatible with cdmaOne (IS-95)

systems

Indonesia Case

PCS PCS 1900 1900 bandband

3G Core Band IMT-2000

1920 1980 2010 2110

IMT-2000MSS MSS

2170

1850

UPCS

1910 1930 1990

MS Tx ; BS Rx BS Tx ; MS Rx

3G CORE BANDS vs PCS1900 BANDS

Potential Interference Potential Interference

Type of Potential Interference issues that would arise in such PCS-WCDMA “mixed band plan” are (source : UMTS Forum –Spectrum Aspect Group)

1. The possibility of interference from PCS Base Station (BS) transmitters to WCDMA BS receivers must be considered

2. The possibility of interference from WCDMA mobile transmitters to PCS mobile receivers must be considered

Potential Interference

• Uplink – downlink Interference

IPRP

WCDMA CDMA2000

d

MS-to-MS interference BS-to-BS interference

Uplink

IWCDMA CDMA2000d

downlinkUplink

downlink

Need Minimum separation distance (MSD)Need Guard-band

Capacity ReductionDropped Call

Arrangements of the Arrangements of the ““CoreCore”” band in Indiaband in India

2025 MHz

MSS

1920 1980 2010

2110 2170 2200 MHz

MSS

Unpaired

SPACE OPERATION

IMTIMT--2000:2000:WCDMA and cdma2000WCDMA and cdma2000

Uplink bandUplink band

Downlink bandDownlink band

Arrangements of the Arrangements of the ““CoreCore”” band in Korea and Japanband in Korea and Japan

2025 MHz

MSS

1920 1980 2010

2110 2170 2200 MHz

MSS

Unpairedcdma2000cdma2000 WCDMAWCDMA WCDMAWCDMA

Uplink bandUplink band

Downlink bandDownlink band

Indonesia Indonesia 2 GHz band2 GHz band

UPLINK

DOWNLINK

Indonesia Case

FWA (Indosat and Telkom) 2 x 10 MHz : 1880 – 1890 MHz / 1960 – 1970 MHz

Already allocated to 3G Operators (NTS and CAC) : 2 x 25 MHz (1920 – 1945 MHz / 2110 – 2135 MHz)

IMT-2000 Core Band IMT-2000

1920 1980 2010 2110

IMT-2000MSS MSS

2170

PCS PCS bandband

2025

IMT

2010

unpaired band15 MHz

19801920

IMT-2000

2110 2170

IMT-2000

19001880

DCS 1800

1805

FWA(CDMA2000)

1850

UPCS1910 1930 1990

MS Tx ; BS Rx BS Tx ; MS Rx

IndonesiaIndonesia 3G 3G SpectrumSpectrum

Indonesia already adopted 2 technologies in 1.9 – 2 GHz band :

• PCS1900 for FWA licenses (the frequency arrangement have reversed UpLink – DownLink directions with the 3G core band)

• WCDMA for 3G licenses (already assign the license to 2 new operators, existing 2G operators willing to have 3G license)

• Mixed band : Potential 3G Interference including possibility of interference from DCS1800 BS transmitter to PCS BS receiver

• Need Field Trial to investigate on the possibility of interference and to identify appropriate guard band

3G Field Trial• Objective : to find out technical or non-technical occurrence in 3G operational and

investigation on the possible interference.

• Implementer : 3 (three) GSM existing-operators (Telkomsel, Indosat and Excelcom) with participation from local academic/university

• Interference scenarios – Space separation :

a. Identify minimum separation distance between MS to MS and BS to BS Antenna (3G to FWA)

b. Coverage performance of 3G BS (cell breathing)

– Frequency Separation (GuardBand) :a. C1 (1945 – 1950 MHz / 2135 – 2140 MHz) = 10 MHz guardband availableb. C2 (1950 – 1955 MHz / 2140 – 2145 MHz) = 5 MHz guardband availablec. C3 (1955 – 1960 MHz / 2145 – 2150 MHz) = No guardband available worst case

• Parameter measurement for interference analysis : Rx power, EC/Io, RSSI MS and RSSI BS

Minimum Testing Requirement

Technical :• Interference Analysis for MS to MS operation and Base Station to Base Station

operation• Guardband necessity • Carrier Frequency Arrangement (3G and FWA)• Base Station

– Co-Location– Measuring the distance parameter of Base Station facing to facing antenna– frequency carrier shifting

Business :• Interoperability between vendors and operators

– interoperability from 2G services to 3G services – Interoperability from 3G services to 3G services (different operator) especially for

voice call and data handling. • network performance • Feature services (voice call, videophone call, video streaming, mobile high speed

data)• Radius coverage• Handover from 2G to 3G

Initial Step for Interference Trial

• Implementation : 18th July 2005• Object : Star One (Indosat) and 3G Telkomsel• Location : BS Indoor JHCC Senayan• Frequency : C1 (1945 – 1950 MHz)

C3 (1955 – 1960 MHz)Star One frequency : 1960 – 1962 MHz

1962 – 1964 MHz• Space separation :

– 3G BS antenna to Star One BS antenna = 2 metre– 3G MS to Star One MS = 1 metre– BS antenna to MS = 6 metre

• Result : this initial trial has not indicated yet the interference occurence, furthermore still need evaluation in technical investigation for the next trial

Antenna BS Location (Telkomsel)

3G BS antenna

Antenna BS Location (Star One)

Star One BS antenna

Temporary Result• Frequency : C3 (1955 – 1960 MHz)

-108 dBm-108 dBm-108 dBm-108 dBmRSSI BTS

-64 dBm-64 dBm-64 dBm-64 dBmRSSI MS

-2.7 dBm-2.7 dBm-2.7 dBm-2.7 dBmEC/Io

-57 dBm-57 dBm-57 dBm-57 dBmRx Power

II. CDMA2000 Star One Indosat

RSSI BTS

-62 dBm-62 dBm-60 dBm-60 dBmRSSI MS

-4 dBm-4 dBm-4 dBm-4 dBmEC/Io

-63 dBm-63 dBm-64 dBm-63 dBmRx Power

I. WCDMA Telkomsel

Video StreamingDataVideo CallIdle

Next Trial : Evaluation for Technical Investigation

• Identify location and load traffic that represents interference occurrence

• Need to prepare the appropriate tool for monitoring interference parameter

• BS to BS interference analysis– PCS-BS Tx carriers cause Core Band Rx overload (Intermodulation,

desensitization due to insufficient blocking)– Spurious emissions, Wideband noise has to be filtered out

• Criteria:– Required isolation PCS-BS Tx - Core Band-BS Rx– PCS-BS Tx power and spurious transmissions– Noise floor– Antenna coupling loss(omni = worst case)– Additional filtering and size of guard band

Thank You

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