SFH Technical

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GPD Advanced Network Development Centre

Motorola Confidential Proprietary

FREQUENCY HOPPINGFREQUENCY HOPPING

CAPACITY & QUALITY CAPACITY & QUALITY IMPROVEMENTIMPROVEMENT

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Frequency Hopping TechniqueFrequency Hopping Technique• BASIS:BASIS:

– Frequency DiversityFrequency Diversity– Interference AveragingInterference Averaging

• IMPLEMENTATION:IMPLEMENTATION:– Base Band Frequency Hopping (BBH) Base Band Frequency Hopping (BBH) – Synthesiser Frequency Hopping (SFH)Synthesiser Frequency Hopping (SFH)

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Frequency Hopping Technique (2)Frequency Hopping Technique (2)• PERFORMANCE OF FREQUENCY HOPPING PERFORMANCE OF FREQUENCY HOPPING

SYSTEMSSYSTEMS• ADVANTAGES:ADVANTAGES:

– Quality ImprovementQuality Improvement– Capacity IncreaseCapacity Increase– Investment ReductionInvestment Reduction

• SFH vs. BBHSFH vs. BBH

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FREQUENCY DIVERSITYFREQUENCY DIVERSITY• Protection Against Deep Fading for Slow Mobiles.Protection Against Deep Fading for Slow Mobiles.• Frequency Selective Nature of the Fading: All Frequency Selective Nature of the Fading: All

Frequencies Not Faded at the Same Time and at the Frequencies Not Faded at the Same Time and at the Same Position.Same Position.

• Corrupted Bursts are Reduced and Temporally Corrupted Bursts are Reduced and Temporally Spread: More Effectiveness of Decoding and Spread: More Effectiveness of Decoding and Deinterleaving Processes.Deinterleaving Processes.

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FREQUENCY DIVERSITY (2)FREQUENCY DIVERSITY (2)

Non HoppingNon Hopping

Freq. f1Freq. f1

Freq. f1Freq. f1

Freq. f2Freq. f2

HoppingHopping

Corrupted BurstsCorrupted Bursts

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FREQUENCY DIVERSITY (3)FREQUENCY DIVERSITY (3)• More Concentration of the Received Level Values More Concentration of the Received Level Values

Around the Mean (Smaller Deviation).Around the Mean (Smaller Deviation).• Frame Erasure Rate (FER) is the Right Measure of Frame Erasure Rate (FER) is the Right Measure of

the Voice Quality (Higher RxQual Values are the Voice Quality (Higher RxQual Values are Tolerated With Frequency Hopping)Tolerated With Frequency Hopping)

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INTERFERENCE AVERAGINGINTERFERENCE AVERAGING• FIXED SYSTEM: Permanent Interference FIXED SYSTEM: Permanent Interference

Between Interfering Cells When There is a Between Interfering Cells When There is a Call.Call.

• HOPPING SYSTEM: Variable HOPPING SYSTEM: Variable Interference Depending on the Interference Depending on the Frequencies Used to Transmit each Burst.Frequencies Used to Transmit each Burst.

• The Calls Experience an Average Quality The Calls Experience an Average Quality Instead of Extreme Situations of Either Instead of Extreme Situations of Either Good or Bad Quality.Good or Bad Quality.

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INTERFERENCE AVERAGING (2)INTERFERENCE AVERAGING (2)f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1

f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1

Wanted Call (f1 fixed)Wanted Call (f1 fixed)

Interfering Call (f1 fixed)Interfering Call (f1 fixed)

Corrupted Bursts because of InterferenceCorrupted Bursts because of Interference

f1 f3 f1 f2 f3 f1 f2 f1 f3 f1 f2 f3 f2 f1 f2 f1 f3 f2 f3 f1 f2 f1 f3 f1 f3 f2 f1

f3 f2 f1 f3 f1 f3 f2 f3 f1 f2 f1 f3 f1 f2 f3 f1 f2 f1 f3 f2 f1 f3 f1 f2 f1 f2 f3

Wanted Call (Hopping over f1, f2, f3)Wanted Call (Hopping over f1, f2, f3)

Interfering Call (Hopping over f1, f2, f3)Interfering Call (Hopping over f1, f2, f3)

Corrupted Bursts because of InterferenceCorrupted Bursts because of Interference

Non HoppingNon Hopping

HoppingHopping

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INTERFERENCE AVERAGING (3)INTERFERENCE AVERAGING (3)• Decoding and Deinterleaving Processes are Decoding and Deinterleaving Processes are

Able to Cope with a Higher BER => Higher Able to Cope with a Higher BER => Higher RxQual is Tolerated With F. H. Without RxQual is Tolerated With F. H. Without Impacting the Quality (Lower FER).Impacting the Quality (Lower FER).

• Hopping: Bad Perceived Quality => Hopping: Bad Perceived Quality => RxQual = 6 or 7RxQual = 6 or 7

• Non Hopping: Bad Perceived Quality => Non Hopping: Bad Perceived Quality => RxQual = 5, 6 or 7RxQual = 5, 6 or 7

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INTERFERENCE AVERAGING (4)INTERFERENCE AVERAGING (4)

• QUALITY-CAPACITY TRADE-OFF: "For the same QUALITY-CAPACITY TRADE-OFF: "For the same capacity FH improves the quality, and for a given average capacity FH improves the quality, and for a given average quality FH makes possible increase the capacity".quality FH makes possible increase the capacity".

NON HOPPINGSYSTEM

C

A

P

Q

U

A

HOPPING SYSTEM

C

A

P

Q

U

A

HOPPING SYSTEM

C

A

PQ

U

A

HOPPING SYSTEM

C

A

P

Q

U

A

OR OR

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COMBINATION OF CARRIERS WITH F.H.: COMBINATION OF CARRIERS WITH F.H.: CAVITY COMBININGCAVITY COMBINING

• Frequencies Transmitted Frequencies Transmitted by The Same Antenna by The Same Antenna and Combined Through and Combined Through Cavities.Cavities.

DRCU

DRCU

DRCU

DRCU

DRCU

DRCU

CAVITY COMBINER

TX RX2RX1

Max. Power (20W)

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COMBINATION OF CARRIERS WITH F.H.: COMBINATION OF CARRIERS WITH F.H.: AIR COMBININGAIR COMBINING

DRCU

DRCU

DRCU

DRCU

DRCU

DRCU

HYBRID

TX3 TX2/RX2TX1/RX1

Max. Power (20W)

HYBRID HYBRID

DUPLEXER DUPLEXER

• Frequencies Transmitted Frequencies Transmitted by Different Antennae and by Different Antennae and Combined on the Air.Combined on the Air.

• Maximum Power at the Maximum Power at the Top of the Rack Using Top of the Rack Using Hybrids.Hybrids.

• Reduced Intermodulation Reduced Intermodulation Products.Products.

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BASE BAND H0PPING (BBH)BASE BAND H0PPING (BBH)• The TCUs Always Transmit a Fixed Frequency.The TCUs Always Transmit a Fixed Frequency.• The Call "Hops" over the TCUs, Always in the Same The Call "Hops" over the TCUs, Always in the Same

Timeslot, on a per Burst Basis.Timeslot, on a per Burst Basis.• In Reception the Call is Always Processed by the In Reception the Call is Always Processed by the

Same TCU (The one where the Call Started).Same TCU (The one where the Call Started).• The Number of Frequencies to Hop Over is Limited The Number of Frequencies to Hop Over is Limited

by the Number of TCUs Equipped in the Cell.by the Number of TCUs Equipped in the Cell.• The BCCH Carrier Can Hop in Timeslots 1 to 7 The BCCH Carrier Can Hop in Timeslots 1 to 7

(Without Power Control/DTX).(Without Power Control/DTX).

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SYNTHESISER FREQUENCY SYNTHESISER FREQUENCY HOPPING (SFH)HOPPING (SFH)

• The TCUs are Able to Retune to a New Frequency The TCUs are Able to Retune to a New Frequency Each Burst.Each Burst.

• The Call Always Stays in the Same TCU.The Call Always Stays in the Same TCU.• One TCU Can Hop up to Over 64 Different One TCU Can Hop up to Over 64 Different

Frequencies.Frequencies.• Wide-Band Combining Devices (Hybrids) are Required Wide-Band Combining Devices (Hybrids) are Required

in the Base Station (Cavity Combiners Can Not be used in the Base Station (Cavity Combiners Can Not be used with SFH).with SFH).

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SYNTHESISER FREQUENCY SYNTHESISER FREQUENCY HOPPING (SFH) (2)HOPPING (SFH) (2)

• The BCCH Frequency Can Be Included in the Hopping The BCCH Frequency Can Be Included in the Hopping Sequence, But In Practice, BCCH Carrier Never Hops, and Sequence, But In Practice, BCCH Carrier Never Hops, and Carries Traffic on Timeslots 1 to 7.Carries Traffic on Timeslots 1 to 7.

• Air Combining Can Be Used in Cells with More than 2 Air Combining Can Be Used in Cells with More than 2 Carriers, using Hybrid Combiners and Duplexors (In a 3 Carriers, using Hybrid Combiners and Duplexors (In a 3 Antennae System, up to 6/6/6 Configuration Transmitting Antennae System, up to 6/6/6 Configuration Transmitting at Full Power).at Full Power).

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FH BASISFH BASIS• Mobile Allocation (MA): Set of Frequencies to Hop Mobile Allocation (MA): Set of Frequencies to Hop

Over.Over.• Hopping Sequence Number (HSN): Order Used to Hopping Sequence Number (HSN): Order Used to

Hop Over the Frequencies. 64 Different (0 is Cyclic Hop Over the Frequencies. 64 Different (0 is Cyclic and 1 - 63 Pseudorandom).and 1 - 63 Pseudorandom).

• Mobile Allocation Index Offset (MAIO): Defines the Mobile Allocation Index Offset (MAIO): Defines the First Frequency to Use in the Transmission When a First Frequency to Use in the Transmission When a Call Starts Hopping.Call Starts Hopping.

• Frequency Hopping Indicator (FHI): Identifies a Frequency Hopping Indicator (FHI): Identifies a Hopping System (MA + HSN).Hopping System (MA + HSN).

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REUSE PATTERNS WITH FHREUSE PATTERNS WITH FH

3x3 Reuse Pattern3x3 Reuse Pattern

1 Freq./Carrier 1 Freq./Carrier

Base Band HoppingBase Band Hopping

1x3 Reuse Pattern 1x1 Reuse Pattern1x3 Reuse Pattern 1x1 Reuse Pattern

More Than 1 Freq./Carrier More Than 1 Freq./Carrier

Synthesiser Frequency HoppingSynthesiser Frequency Hopping

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PRACTICAL RULES FOR F.H. PRACTICAL RULES FOR F.H. IMPLEMENTATIONIMPLEMENTATION

• Use Separate Bands for BCCHs & TCHs.Use Separate Bands for BCCHs & TCHs.

• The Larger the Separation of the Frequencies in the The Larger the Separation of the Frequencies in the Hopping Sequence, the Higher the Benefits of Frequency Hopping Sequence, the Higher the Benefits of Frequency Hopping. (Frequency Diversity)Hopping. (Frequency Diversity)

• Quality Handovers Need to Be Optimised (Higher RxQual Quality Handovers Need to Be Optimised (Higher RxQual Threshold).Threshold).

BCCHTCH

n channels m channels

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FREQUENCY HOPPING FREQUENCY HOPPING PERFORMANCE PERFORMANCE

• Different Scenario Types:Different Scenario Types:

NETWORK TYPE SITEDISTRIBUTION

SECTORORIENTATION

OROGRAPHY OFTHE AREA

A Regular Regular Flat

B Irregular Regular Flat

C Regular Irregular Hilly

D Irregular Irregular Hilly

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1x3 SFH ON A TYPE D NETWORK1x3 SFH ON A TYPE D NETWORK• ScenarioScenario

– High Concentration of Sites in the Busiest Area.High Concentration of Sites in the Busiest Area.– Irregular Sector Orientation.Irregular Sector Orientation.– Extremely Difficult Planning (Presence of Hills, Extremely Difficult Planning (Presence of Hills,

River, Sea, ...).River, Sea, ...).

• System DescriptionSystem Description– 16 Sites (47 Cells)16 Sites (47 Cells)– 2/2/2 Configuration in Most of the Sites and 3/3/3 in 2/2/2 Configuration in Most of the Sites and 3/3/3 in

the Centrethe Centre– 40 Frequencies Available40 Frequencies Available

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1x3 SFH ON A TYPE D NETWORK (2)1x3 SFH ON A TYPE D NETWORK (2)• SFH SystemSFH System

– 21 Frequencies for BCCHs21 Frequencies for BCCHs– 18 Frequencies for TCHs With SFH18 Frequencies for TCHs With SFH– 1x3 Reuse Pattern Using Sequences of 6 Frequencies1x3 Reuse Pattern Using Sequences of 6 Frequencies– Expansion to 3/3/3 Configuration in Some CellsExpansion to 3/3/3 Configuration in Some Cells

• Exceptions to the Regular Pattern due to the ScenarioExceptions to the Regular Pattern due to the Scenario

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1x3 SFH ON A TYPE D NETWORK (3)1x3 SFH ON A TYPE D NETWORK (3)• Regular 1x3 Reuse Pattern Hopping Over 6 FrequenciesRegular 1x3 Reuse Pattern Hopping Over 6 Frequencies

HOPPING SYSTEMf1, f4, f7, f10, f13,,f16

f2, f5, f8, f11, f14, f17

f3, f6, f9, f12, f15, f18

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1x3 SFH ON A TYPE D NETWORK (4)1x3 SFH ON A TYPE D NETWORK (4)

• 20% Reduction in RFloss on Traffic Channels20% Reduction in RFloss on Traffic Channels

TCH RF_Loss

0,71

0,902

00,10,20,30,40,50,60,70,80,9

1

FIXED SYSTEM 1x3x6

Perc

enta

ge OMC STATSOMC STATS

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• More Successful HandoversMore Successful Handovers• 10% Reduction in Drop Calls due to Failures in HO10% Reduction in Drop Calls due to Failures in HO

HO Suc. Rate

94,23 94,65

0102030405060708090

100

FIXED SYSTEM 1x3x6

Perc

enta

ge

HO Fail Rate

1,03

1,14

0,960,98

11,021,041,061,081,1

1,121,14

FIXED SYSTEM

1x3x6

Perc

enta

geOMC STATSOMC STATS

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1x3 SFH ON TYPE D NETWORK (6)1x3 SFH ON TYPE D NETWORK (6)CAPACITY SOLUTIONCAPACITY SOLUTION

• FIXED SYSTEM:FIXED SYSTEM: 2 Carriers per Cell2 Carriers per Cell

• SFH SYSTEM:SFH SYSTEM: 3 Carriers per Cell3 Carriers per Cell

82% CAPACITY INCREASE IN 82% CAPACITY INCREASE IN A REAL NETWORKA REAL NETWORK

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1x1 SFH ON A TYPE D NETWORK1x1 SFH ON A TYPE D NETWORKCAPACITY AND QUALITY SOLUTIONCAPACITY AND QUALITY SOLUTION

• 40 Frequencies40 Frequencies– 15 Frequencies for BCCHs15 Frequencies for BCCHs– 7 Frequencies for Micros7 Frequencies for Micros– 18 Frequencies for TCHs With SFH18 Frequencies for TCHs With SFH

• 1x1 Reuse Pattern Using Sequences of 6 Frequencies1x1 Reuse Pattern Using Sequences of 6 Frequencies• 4/4/4 Configuration in Most of the Cells4/4/4 Configuration in Most of the Cells• More than 70 SitesMore than 70 Sites

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1x1 SFH ON A TYPE D NETWORK (2)1x1 SFH ON A TYPE D NETWORK (2)IMPLEMENTATIONIMPLEMENTATION

• Same MA for All CellsSame MA for All Cells• Different HSN per Site (Same for Cells on the Same Different HSN per Site (Same for Cells on the Same

Site)Site)• Non-Adjacent MAIOs on the CarriersNon-Adjacent MAIOs on the Carriers• Interference Avoidance between Carriers of the Interference Avoidance between Carriers of the

Same SiteSame Site

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1x1 SFH ON A TYPE D NETWORK (3)1x1 SFH ON A TYPE D NETWORK (3)IMPLEMENTATION (2)IMPLEMENTATION (2)

• 1x1 SFH: 18 Frequencies1x1 SFH: 18 Frequencies• Up to 9 Hopping Carriers Up to 9 Hopping Carriers

per Site Without per Site Without InterferenceInterference

• 4/4/4 Configuration4/4/4 Configuration

BCCHTCH Hopping (MAIO)

0 126

4 10 16 2 8 14

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SFH 1x3x6 (*) SFH 1x1x18

2,17

2,04

1,46

1,76 1,72

1,39

1,00

1,20

1,40

1,60

1,80

2,00

2,20

(%)


Configuration

DROPPED CALLS (RFLOSSES)

TOTAL_RF_LOSS

SDCCH_RF_LOSS

TCH_RF_LOSS

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1,45

2,41

1,461,68

0,00

0,50

1,00

1,50

2,00

2,50

(%)


Configuration

DROPPED CALLS AND FAILS ON HANDOVERS

HO_FAIL

DROPPED CALLS

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F.H. FOR QUALITYF.H. FOR QUALITY

Network A Network B Network CFIXED F. H. FIXED F. H. FIXED F. H.

F.H. Type SFH SFH BBHConfiguration 2/2/2 2/2/2 4/4/4Reuse Pattern 1x3x4 1x1x27 4x3Bad QualityCalls (BuzzardData)

5,3% 1,8% 0,5% 0,0% 2,3% 0,65%

Drop Calls(OMC Stats)

0,94% 0,58% 1,05% 0,63% 1,3% 0,79%

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F. H. FOR CAPACITYF. H. FOR CAPACITYNetwork B Network D

FIXED F.H. FIXED F.H.

F. H. Type BBH SFHConfiguration 4/4/4 5/5/5 2/2/2 3/3/3Reuse Pattern 4x3 3x3 - 1x3CapacityIncrease

+33% +82%

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ADVANTAGESADVANTAGESQUALITY IMPROVEMENTQUALITY IMPROVEMENT

• Reduction in FERReduction in FER• Improve Subjective Voice QualityImprove Subjective Voice Quality• Reduction in Drop CallsReduction in Drop Calls• Increase Call Success RateIncrease Call Success Rate

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ADVANTAGES (2)ADVANTAGES (2)CAPACITY INCREASECAPACITY INCREASE

The Same Quality is Achieved With Lower C/I Values.The Same Quality is Achieved With Lower C/I Values.

Reuse the Frequencies in a Tighter WayReuse the Frequencies in a Tighter Way

ADD MORE CARRIERSADD MORE CARRIERS& MORE SITES& MORE SITES

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ADVANTAGES (3)ADVANTAGES (3)CAPACITY INCREASE (2)CAPACITY INCREASE (2)

Cell Placed in a Cell Placed in a Non-Location Area Non-Location Area BorderBorder

NUMBER OF DRCUs NUMBER OF TCHs TRAFFIC OFFERED (E)

1 7 2.94

2 14 8.20

3 22 14.9

4 30 21.9

5 38 29.2

6 45 35.6

7 53 43.1

8 61 50.6

9 69 58.2

TRAFFIC OFFEREDTRAFFIC OFFERED

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ADVANTAGES (4)ADVANTAGES (4)CAPACITY INCREASE (3)CAPACITY INCREASE (3)

FREQUENCIES CONFIGURATIONS TRAFFIC OFFERED (E/Km2) CAPACITY INCREASES

AVAILABLE FIXED BBH SFH FIXED BBH SFH BBH /FIXED

SFH /FIXED

SFH /BBH

24 2/2/2 2/2/2 * 3/3/3 31.32 31.32 56.91 - 82% 82%

36 3/3/3 4/4/4** 5/5/5 56.91 83.64 111.54 47% 96% 33%

48 4/4/4 5/5/5 7/7/7 83.64 111.54 164.64 33% 97% 48%

60 5/5/5 6/6/6 * 9/9/9 111.54 135.99 222.30 22% 99% 63%

(*) 3 Frequencies Left(*) 3 Frequencies Left

(**) One of the Frequencies Reused in a 2x3 Pattern(**) One of the Frequencies Reused in a 2x3 Pattern

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ADVANTAGES (5)ADVANTAGES (5)INVESTMENT REDUCTIONINVESTMENT REDUCTION

• Respect to the Fixed System Case:Respect to the Fixed System Case:– Reduction in Number of Sites Required, for the Reduction in Number of Sites Required, for the

Same Capacity and Quality.Same Capacity and Quality.– Reduction in Time and Work Required for Reduction in Time and Work Required for

Planning.Planning.– Reduction in Time and Work Required for Reduction in Time and Work Required for

Optimisation.Optimisation.

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SFH vs. BBHSFH vs. BBH• QualityQuality: Both SFH & BBH Enhance the Quality. : Both SFH & BBH Enhance the Quality.

SFH Performs Better With Few Carriers per Cell.SFH Performs Better With Few Carriers per Cell.• CapacityCapacity: SFH Permits Higher Increase, Because : SFH Permits Higher Increase, Because

Tighter Frequency Reuses are Possible.Tighter Frequency Reuses are Possible.• Frequency PlanningFrequency Planning: SFH is Much Easier to Plan : SFH is Much Easier to Plan

Than BBH or a Fixed System:Than BBH or a Fixed System:– Only Requires BCCH Planning (TCH planning is Only Requires BCCH Planning (TCH planning is

Not Required ).Not Required ).– All TCHs in The Cell Reuse the same Set of All TCHs in The Cell Reuse the same Set of

Frequencies.Frequencies.

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SFH vs. BBH (2)SFH vs. BBH (2)– All the Frequencies for Hopping are Reused in All the All the Frequencies for Hopping are Reused in All the

Sites (1x3 Reuse) or Cells (1x1 Reuse).Sites (1x3 Reuse) or Cells (1x1 Reuse).– To Add a New Site Only Requires to Select a Frequency To Add a New Site Only Requires to Select a Frequency

for the BCCH.for the BCCH.• Optimisation: Easier with SFH, but Different Philosophy.Optimisation: Easier with SFH, but Different Philosophy.• Hardware Impacts: SFH Can not be Implemented with Hardware Impacts: SFH Can not be Implemented with

Cavity Combiners. Hybrids are Useful for Both SFH & Cavity Combiners. Hybrids are Useful for Both SFH & BBH.BBH.

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SFH vs. BBH (3)SFH vs. BBH (3)• Hopping BCCH: BBH Can be Implemented on the BCCH. Hopping BCCH: BBH Can be Implemented on the BCCH.

It is not worth doing it with SFH. It is not worth doing it with SFH. • Flexibility: Flexibility:

– The Integration of a New Site is Easier with SFH. The Integration of a New Site is Easier with SFH. – No Interdependence Between the Different Carriers of No Interdependence Between the Different Carriers of

the Cell in SFH.the Cell in SFH.• Economic Advantages: More Savings with SFH.Economic Advantages: More Savings with SFH.

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SFH vs. BBH (4)SFH vs. BBH (4)

SFH vs. BBH ComparisonSFH vs. BBH Comparison

ASPECTS OF COMPARISON BETTER OPTION TO IMPLEMENT

QUALITY IMPROVEMENT BBH & SFH

CAPACITY INCREASE SFH

SIMPLICITY IN FREQUENCY PLANNING SFH

SIMPLICITY IN OPTIMISATION SFH

HARDWARE IMPACTS BBH & SFH

HOPPING ON THE BCCH BBH

FLEXIBILITY SFH

ECONOMIC ADVANTAGES SFH

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F.H. ADVANCED FEATURESF.H. ADVANCED FEATURESSEPARATE RXQUAL THRESHOLDSSEPARATE RXQUAL THRESHOLDS

FOR HOPPING / NON HOPPING CHANNELSFOR HOPPING / NON HOPPING CHANNELS

• RXQUAL Indicates Bit Error Rate but RXQUAL Indicates Bit Error Rate but Deinterleaving&Decoding Processes (=>FER) Deinterleaving&Decoding Processes (=>FER) Work More Efficiently with FH.Work More Efficiently with FH.

• Channels with Frequency Hopping Tolerate Channels with Frequency Hopping Tolerate Higher RxQual Values Without Quality Higher RxQual Values Without Quality DegradationDegradation

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F.H. ADVANCED FEATURES (2)F.H. ADVANCED FEATURES (2)MANUAL MAIO CONTROLMANUAL MAIO CONTROL

• Avoids Adjacent Channel Interference Between Avoids Adjacent Channel Interference Between Carriers of the Same CellCarriers of the Same Cell

• Avoids Co-Channel & Adjacent Channel Avoids Co-Channel & Adjacent Channel Interference Between Carriers in Different Cells Interference Between Carriers in Different Cells in the Same Sitein the Same Site

• Opens the Door to the One-Cell Reuse (1x1)Opens the Door to the One-Cell Reuse (1x1)

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F.H. ADVANCED FEATURES (3)F.H. ADVANCED FEATURES (3)PRIORITY PER CARRIERPRIORITY PER CARRIER

• Traffic Can be Directed to Either the Hopping Traffic Can be Directed to Either the Hopping or Non-Hopping Channelsor Non-Hopping Channels

• Global Interference Level is Reduced when Global Interference Level is Reduced when Different Priority is Assigned to Different Different Priority is Assigned to Different Hopping CarriersHopping Carriers

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F.H. ADVANCED FEATURES (4)F.H. ADVANCED FEATURES (4)SPECIFIC SDCCH PLACEMENTSPECIFIC SDCCH PLACEMENT

• SDCCH channels can be placed in the BCCH SDCCH channels can be placed in the BCCH carrier. (Interleaving Depth on SDCCHs is carrier. (Interleaving Depth on SDCCHs is Lower than on TCHs)Lower than on TCHs)

• It Eliminates the Problems with some Old It Eliminates the Problems with some Old Mobiles Using Hopping SDCCHsMobiles Using Hopping SDCCHs

Documents

SFH Technical