advanced repeater function.pdf

8/11/2019 Advanced Repeater Function.pdf

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REMOTEK CORPORATION

www.remotek.com.tw

Advanced Repeater Function- Intelligent Mode Function & Donor Signal Measurement


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Agenda

INTELLIGENT MODE

2

SILENT MODE

DONOR SIGNAL MEASUREMENT

ANTI SELF-OSCILLATION

ADVANTAGES

ISOLATION DETECTION


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Agenda

3

INTELLIGENT MODE

SILENT MODE



ADVANTAGES

ISOLATION DETECTION


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Interference from New Repeater

4

Node B

Coverage

Node BCoverage

NODE BNODE B

Repeater

coverage

Repeater

coverage

NODE B

Node B

Coverage

New

Repeatersite

The existing Node B site may suffer UL interference from repeater due to

shorter distance between Node B and repeaters or improper repeater

commissioning. The sensitivity and coverage of existing Node B will be

decreased due to such repeater interference.

Repeater

coverage

Repeater

coverage

Repeatercoverage

Repeater

coverage


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Interference to New Node B

5

Node BCoverage

Node B

CoverageNODE BNODE B

Repeater

coverage

NODE B

Node B

Coverage

NewNode B site

Repeatercoverage

NODE B

Repeater

coverage

Node B

Coverage

The new Node B site would suffer UL interference due to existing nearby

repeater site. The sensitivity and coverage of new Node B may be decreased by

existing repeater site.

NewNode B site

Repeater

coverage


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With/ Without Intelligent Mode

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Repeater

Without Intelligent Mode in worse case

Repeater

With Intelligent Mode in worse case

Intelligent

Circuit

Cannot make call

Can make call

Node b Coverage

Interference

B.T.S

Node B Coverage

B.T.S

No

Interference


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Agenda

8

INTELLIGENT MODE

SILENT MODE



ADVANTAGES

ISOLATION DETECTION


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Node B

Repeaters noise floor = -116dBm








Amount ofRepeaters

Increment ofRepeaters Noise Floor

Total RepeatersNoise Floor

Total NoiseFloor in BTS

Increment ofBTSs Noise Floor

Status

Ref: Node B Noise Floor = -105dBm

1 0dB -116dBm -104.67dBm 0.33dB No Interference

2 3dB -113dBm -104.36dBm 0.64dB Low Interference

4 6dB -110dBm -103.81dBm 1.19dB Interference

8 9dB -107dBm -102.88dBm 2.12dB Interference

Total Noise Floor Without Silent Mode

Based on Macro Repeater


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Total Noise Floor With Silent Mode

Amount ofRepeaters

Increment ofRepeaters Noise Floor

Total RepeatersNoise Floor

Total NoiseFloor in BTS

Increment ofBTSs Noise Floor

Status

1 0dB 0dBm -105dBm 0dB No repeater is active

2 0dB 0dBm -105dBm 0dB No repeater is active

4 0dB -116dBm -104.67dBm 0.33dB 1 repeater is active

8 3dB -113dBm -104.36dBm 0.64dB 2 repeaters are active

Ref: Node B Noise Floor = -105dBm

Node B

In Silent Mode

In Silent Mode

In Silent Mode


In Silent Mode

In Silent Mode

In Silent Mode


Based on Macro Repeater


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UL RF INPUT

Silent Mode

Detection

Enable/Disable

Uplink PA

The silent mode would disable the UL PA when there are no subscribers making calls, and

enable the UL PA when subscribers are accessing the repeater.

The UL noise floor interference towards the BTS/Node B can be minimized.

Silent Mode can provide the idle ratio of the repeater *

Idle Ratio = Total time not being used by subscriber/Total time after on air

Silent Mode records the time that the repeater has not being used by subscribers, and when

the time exceeds the user defined time range, an alarm would be sent to the control center*

Silent Mode

* The function will be available in Q2 2014


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Without Silent

Mode

With Silent Mode

Interference Comparison

Interference comparison between Repeaters with Silent Mode and without

Silent Mode. Under the circumstances that only 25% of the total installed

Repeaters are being access by subscribers.

Amount of

Repeaters

Installed

Node B Rx

Interference

Level


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Operator A

Operator B

Enable UL PA

UL PA keep on

silent modeDesigned for

Operator A

Since the repeater was designed for operator A, when the subscriber of operator A with

same system were making a call, the repeater will activate the UL PA automatically.

When there are other signals go to the repeater, the repeater wont activate the UL PA,

because the repeater was designed only for operator A according to the operator A

frequency.

Operator D

Operator C

Silent Mode


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Agenda

14

INTELLIGENT MODE

SILENT MODE



ADVANTAGES

ISOLATION DETECTION


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15

Splitter Splitter

Ant

Outdoor Donor

Antenna

AntAnt

Splitter

AntAnt

Ant

B1

Window

1F

2F

3F

Indoor decoration change

Donor antenna orientation change

Outdoor environment change

Oscillation Interference

Repeater


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Oscillation

DetectionParameter

adj.

OscillationSafety

Designed this advanced function which can periodically auto adjust parameters

to avoid oscillation interference.

RF input

Set Parameter

Oscillation Interference Prevention

The repeater equipped with oscillation detection function, it will detect the

oscillation issue. Once the oscillation phenomenon occurs, it will adjust the

parameter step by step until the oscillation problem is eliminated.

Oscillation Prevention


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Agenda

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INTELLIGENT MODE

SILENT MODE

ISOLATION DETECTION


ADVANTAGES



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Isolation Detection Insufficient isolation of the repeater system would cause self-oscillation.

Normally, isolation value of the repeater system can only be obtained with

actual measurement via a spectrum & signal generator

Remotek Repeater can detects the isolation of the repeater system

Auto set Repeater parameters according to the isolation detected.

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Advantages

Isolation can be measured.

Self-oscillation can be prevented.

Self-oscillation interference towards Node B can be avoided.

Easier for troubleshooting and maintenance locally and remotely.


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Agenda

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INTELLIGENT MODE

SILENT MODE



ADVANTAGES

ISOLATION DETECTION


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Configuration Concept

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While repeater providing coverage to shadowed area, the

repeater also monitors the donor signal status continuously.

With the possibility of knowing the donor signal status, repeater

performance can be expected.

Existing 600 repeaters in Maxis network can be upgraded by

adding an optional RMU (remote monitoring unit)


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Donor Signal Measurement

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Donor Signal Strength can be measured

Donor Signal Quality can be measured

Donor Signal can either be 2G or 3G

Neighbors Information can also be measured

Potential Co-Channel and Adjacent

Channel problem can be identified.


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Donor Signal Measurement

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GSM/DCS SYSTEM WCDMA SYSTEM

Active Neighbor Active Neighbor

BCCH

(ARFCN) X X UARFCN X X

RSSI X X SC X X

Rx Qual X RSSI X

TA X RSCP X X

BSIC X Ec/No X X

Cell ID X X Cell ID X X

LAC X X LAC X X

Net NameX Net Name X


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Donor Signal Parameters User Interface

24

GSM WCDMA


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Donor Signal Comparison*

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The measured donor signal records can be listed in a table

for comparison purpose.



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Donor Signal Parameter Alarms *

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Current signal strength (RSCP/Rxlev) measurement would becompared with the previous signal strength measurement. If thesignal strength variation exceed the user defined amount, an alarmwould be sent.

Current signal quality (EcNo/RxQual) measurement would becompared with the previous signal quality measurement. If thesignal quality variation exceed the user defined, an alarm would besent.

Signal Strength is worse than a value (user defined), an alarm wouldbe sent.

Signal Quality is worse than a value (user defined), an alarm wouldbe sent.

If the primary donor signal SC or BCCH varies (donor signalunstable), an alarm would be sent.



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Benefits

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Optimization

The most appropriate location and direction for the donor antennacan be find out with easiness, and optimization for the Repeatersystem becomes easy.

Troubleshooting

The faulty problem can be located easily which would enhance theTroubleshooting efficiency

Maintenance

Repeater Status can be maintained effortlessly, since the comparisonof the donor signal and the service signal can be made morespecifically.


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Cost Saving

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No additional equipment needs to be purchased

It may take some time to arrange the trip to site for troubleshooting.

Trip to site for troubleshooting would cost around USD200.

The problem may not always be coming from repeater, and the trip to the

site may be in vain.

The donor signal measurement provide the means to rule out some of thesituations that when the problems are not coming from the repeater.


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Agenda

30

INTELLIGENT MODE

SILENT MODE



ADVANTAGES


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Advantages

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State of the art design

Low interference

Low maintenance

User friendly

Easy installation

Cost effective solution


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THANK YOU

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advanced repeater function.pdf

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