omf000502 network planning principle issue1.3
TRANSCRIPT
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OMF000502 Network Planning Principle ISSUE1.3
OMF000502 Network Planning Principle ISSUE1.3
Wireless Training Department
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Introduction to GSM network
Mobile radio link
Network planning procedure
Advanced network planning
Course ContentsCourse Contents
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Introduction to GSM NetworkIntroduction to GSM Network
1. GSM system architecture
2. GSM bandwidth
3. Difference between GSM900 and GSM1800
4. GSM Logical channels
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GSM System ArchitectureGSM System Architecture
Other MSC
Other BTS´s
VLR HLREIR
AuCOMC
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GSM BandwidthGSM Bandwidth
GSM 900 :
Channel spacing 200kHz
GSM 1800 :
Channel spacing 200kHz
1710 1785 1805 1880
Duplex Spacing : 95 MHz
890 915 935 960
Duplex Spacing : 45 MHz
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Difference Between GSM900 and GSM1800Difference Between GSM900 and GSM1800
GSM900 and GSM1800 are similar
GSM 900 GSM 1800
Frequency band 890...960 MHz 1710...1880 MHz
Number of channels 124 374
Channel spacing 200 kHz 200 kHz
Access technique TDMA TDMA
Mobile power 0.8 / 2 / 5 W 0.25 / 1 W
There are no major differences between GSM 900 and GSM 1800
There are no major differences between GSM 900 and GSM 1800
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Logical ChannelsLogical Channels
GSM900/GSM1800 logic channel architecture
Broadcast ControlChannel (BCCH)
Control ChannelsCommon ControlChannel (CCCH)
Traffic Channels (TCH)
FCH SCH BCCH(Sys Info)
TCH/FAGCH RACH SDCCH FACCH
SACCH
TCH/H
TCH/9.6FTCH/ 4.8F, HTCH/ 2.4F, H
PCH
Common Channels (CCH)
Dedicated Channels (DCH)
Logical Channels
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Downlink ChannelsDownlink Channels
FCCH
SCH
BCCH
PCH
AGCH
BCCH
CCCH
Common Channels
SDCCH
SACCH
FACCH
TCH/F
TCH/H
DCCH
TCH
Dedicated Channels
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Uplink ChannelsUplink Channels
RACH CCCHCommon Channels
SDCCH
SACCH
FACCH
TCH/F
TCH/H
DCCH
TCH
Dedicated Channels
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Use of Logical Channels Use of Logical Channels
Search for frequency correction burst
Search for synchronization sequence
Read system information
Listen paging message
Send access burst
Wait for signaling channel allocation
Call setup
Assign traffic channel
Conversation
Call release
FCCH
SCH
BCCH
PCH
RACH
AGCH
SDCCH
SDCCH
TCH
FACCH
idle mode
“off” state
dedicated mode
idle mode
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Logical Channels MappingLogical Channels Mapping
Logical channels are mapped to physical channels
Signaling : sequences of 51 frames
Traffic : sequences of 26 frames
For combined BCCH
CCCH blocks can be either PCH or AGCH
Some blocks may be configured as SDCCH
R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R
F S B B B B C C C C S C C C C C C C CF S C C C C C C C CF S C C C C C C C CF S C C C C C C C CF -
51 TDMA frames ~ 235,4 msecBCCH + CCCH (uplink)
BCCH + CCCH (downlink)
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Exercises
1. Write down the frequency used for uplink and downlink.
Answer: GSM system uses different frequency for uplink and
downlink.
GSM900:
Uplink: 935---960 Downlink: 890---915
GSM1800:
Uplink: 1805--1880 Downlink: 1710--1785
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Exercises
2. Write down the types of logical channels and the hierarchy
Answer:
Broadcast ControlChannel (BCCH)
Control ChannelsCommon ControlChannel (CCCH)
Traffic Channels (TCH)
FCH SCH BCCH(Sys Info)
TCH/FAGCH RACH SDCCH FACCH
SACCH
TCH/H
TCH/9.6FTCH/ 4.8F, HTCH/ 2.4F, H
PCH
Common Channels (CCH)
Dedicated Channels (DCH)
Logical Channels
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Course ContentsCourse Contents
Introduction to GSM network
Mobile radio link
Network planning procedure
Advanced network planning
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Mobile Radio LinkMobile Radio Link
1. Radio wave propagation
2. Propagation models
3. Antenna systems
4. Diversity technique
5. Interference and interference reduction
6. Link budget
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Radio Link PropagationRadio Link Propagation
Multi-path propagation
Radio path is a complicated propagation medium
Limited transmitting energy
The service range is determined by the transmission power of
mobiles
Battery life-time
Limited spectrum
Set upper limitation for data rate (Shannon´s theorem)
Additional effort needed for channel coding
Frequency reused result in self- interference
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Radio Propagation EnvironmentRadio Propagation Environment
Multi-path propagation
Shadowing
Terrain
Building
Reflection
Interference
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ReflectionsReflections
Strong echoes can cause excessive transmission delay
No impact If the delay falls in the equalizer window
Cause self-interference if the delay falls out of the equalizer
window
direct signalstrong reflected signal
equalizer window 16 s
amplitude
delay time
long echoes, out of equalizer window:self-interference
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Fading(1)Fading(1)
Slow fading (Lognormal Fading) Shadowing due to large obstacles o
n propagation direction
Fast fading (Rayleigh fading) Serious interference from multi-path
signals
+10
0
-10
-20
-300 1 2 3 4 5 m
Level (dB)
920 MHzv = 20 km/h
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Fading(2)Fading(2)
time
power
2 sec 4 sec 6 sec
+20 dB
mean value
- 20 dB
lognormal fading
Rayleighfading
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Signal VariationsSignal Variations
Rayleigh fading
Lognormal fading
Large scale variation
Cause Superposition of multiple propagation paths with different phase
Shadowing or reflection by cars, trees, buildings
Prop. path profile, terrain & clutter structure, Earth curvature
Correlation < 10 ... 100m > 100m
Prediction unpredictable mostly predictable (buildings!!)
predictable (maps, terrain database)
Planning method
apply statistical thresholds for Rayleigh fading signals
consider lognormal distribution around local mean (use = 3 ... 10dB)
use maps or digital terrain & clutter databases to predict (50 ..200m pixel resolution)
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PropagationPropagation
Free- space propagation
Signal strength decreases with distance increases
Reflection
Specula R.
Amplitude : A --> α*A (α< 1)
Phase : --> -Ф
Polarization : material determining phase shift
Diffuse R.
Amplitude : A --> α*A (α<< 1)
Phase : random
Polarization : random
specula reflection
diffuse reflection
D
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PropagationPropagation
Absorption
Heavy amplitude attenuation
Material determining phase shift
Diffraction
Wedge-model
Knife edge
Multiple knife edges
A A - 5..30 dB
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Mobile Radio LinkMobile Radio Link
1. Radio wave propagation
2. Propagation models
3. Antenna systems
4. Diversity technique
5. Interference and interference reduction
6. Link budget
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Propagation ModelPropagation Model
Historical CCIR- Model for Radio station
Not very accurate nor serious
Okumura- Hata
Empirical model
Measure and estimate additional attenuations
Applied for larger distance estimation (range: 5 .. 20km)
Not suitable for small distance ( < 1km)
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Hata ModelHata Model
Model used for 900 MHz
L A B f h a h
h d Lb m
b morpho
log . log ( )
( . . log ) log
1382
44 9 655
with
f frequency in MHz
h BS antenna height [m]
a(h) function of MS antenna height
d distance between BS and MS [km] and
A= 69.55, B = 26.16 (for 150 .. 1000 MHz)
A= 46.3 , B = 33.9 (for 1000 ..2000MHz)
additional attenuation dueto land usage classes
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Land Usage TypesLand Usage Types
Urban small cells, 40..50 dB/Dec attenuation
Forest heavy absorption; 30..40 dB/Dec; differs with
season (foliage loss)
Open, farmland easy, smooth propagation conditions
Water propagates very easily ==> dangerous !
Mountain surface strong reflection, long echoes
Glaciers very strong reflection; extreme delay , strong
interferences over long distance
Hilltops can be used as barriers between cells, do not
use as antenna or site location
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Walfish- Ikegami ModelWalfish- Ikegami Model
Model used for urban micro-cell propagation. Assume regular
city layout (“Manhattan grid”). Total path loss consists of three
parts:
Line-of-sight loss LLOS
Roof-to-street loss LRTS
Mobile environment loss LMS
hw
b
d
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Mobil Radio LinkMobil Radio Link
1. Radio wave propagation
2. Propagation model
3. Antenna system
4. Diversity technique
5. Interference and interference reduction
6. Link budget
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Antenna CharacteristicsAntenna Characteristics
Lobes
Main lobes
Side and Back lobes
Front-to-Back ratio
Half-power beam-width
Antenna downtilt
Polarization
Frequency range
Antenna impedance
Mechanical size
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Coupling Between AntennasCoupling Between Antennas
main lobe
5 .. 10
Horizontal separation
Sufficient decoupling distance: 5-10λ
Antenna patterns superimposed if
distance too close
Vertical separation
Decoupling distance:1λ can provide good RX /TX decoupling
Minimum coupling loss
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Recommended decoupling
TX - TX: ~20dB
TX - RX: ~40dB
Horizontal decoupling distance depends on
Antenna gain
Horizontal rad. pattern
Omni-directional antenna
Use vertical separation for RX and TX
Use vertical separation (“fork”) for RX and diversity RX
Vertical decoupling is much more effective
0,2m
Omni-directional.: 5 .. 20mdirectional : 1 ... 3m
Installation ExamplesInstallation Examples
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Installation ExamplesInstallation Examples
Directional antenna
Antenna downtilt
Improve hotspot coverage
Reduce interference
5..8 deg
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FeederFeeder
Feeder parameter
Type Diameter 1800MHz 900MHz (mm) dB/100m dB/100
m
3/8” 10 14 10
5/8” 17 9 6
7/8” 25 6 4
1 5/8” 47 3 2
Use the short feeder whenever possible
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Distributed AntennasDistributed Antennas
Leaking feeder
Cables with very high loss per length unit “distributed antenna”
often used for tunnel coverage. This kind of feeder is expensive
Optic fiber distribution system
Distribute RF signal radiate from discrete antenna points at
remote locations via (very thin) optic fiber.
50 Ohm
Propagation loss: 4 ... 40 dB/100m
coupling loss: ~ 60 dB (at 1m dist.)
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RepeatersRepeaters
Repeater type
Narrow-band Repeater
Wide-band Repeater
The Repeater is used to relay signal into shadowed area
Behind hill
Into valley
Into building
Note: The Repeater needs a host cell
decoupling ~40 dB needed
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Mobile Radio LinkMobile Radio Link
1. Radio wave propagation
2. Propagation models
3. Antenna systems
4. Diversity technique
5. Interference and interference reduction
6. Link budget
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DiversityDiversity
Time diversity
Coding, interleaving
Frequency diversity
Frequency hopping
Space diversity
Multiple antennas
Polarization diversity
Dual-polarized antennas
Multi-path diversity Equalizer
t
f
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Benefit From DiversityBenefit From Diversity
Diversity gain depends on environment
Antenna diversity
3dB gain
More path loss acceptable in link budget
Higher coverage range
R
R(div) ~ 1,3 R A 1.7 A 70% more coverage per cell Needs, less cells in total
The above case can be satisfied only under ideal condition. That is the environment is infinitely large and flat
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Mobile Radio LinkMobile Radio Link
1. Radio wave propagation
2. Propagation models
3. Antenna systems
4. Diversity technique
5. Interference and interference reduction
6. Link budget
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InterferenceInterference
Signal quality =sum of all expected signals carrier (C )sum of all unexpected signal interference (I)=
Notes: GSM specification : C / I >= 9 dB (Co-Channel)
expected signalatmosphericnoise
other signals
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Effects of InterferenceEffects of Interference
Affect signal quality
Cause bit error
Repairable errors : channel coding, error correction
Irreducible errors : phase distortions
Interference situation is
Non- reciprocal : uplink <> downlink
Unsymmetrical : different situation at MS and BTS
C/I
Co-Channel C/I : 9dB
Adjacent Channel C/I : -12dB
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Signal Quality in GSMSignal Quality in GSM
RX Quality RXQUAL class : 0 ... 7
RXQUAL Mean BER BER rangeclass (%) from... to0 0.14 < 0.2%1 0.28 0.2 ... 0.4 %2 0.57 0.4 ... 0.8 %3 1.13 0.8 ... 1.6 %4 2.26 1.6 ... 3.2 %5 4.53 3.2 ... 6.4 %6 9.05 6.4 ... 12.8 %7 18.1 > 12.8 %
usable signal
unusablesignal
good
acceptable
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Interference sourcesInterference sources
Multi-path (long echoes)
Frequency reuse
External interference
Note : Interference has the same effect as poor coverage.
Reduce the interference as possible.
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Methods for reducing InterferenceMethods for reducing Interference
Frequency planning
Suitable site location
Antenna azimuth, downtilt and height
good location
bad location
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Methods for reducing InterferenceMethods for reducing Interference
Frequency hopping
A diversity technique, frequency diversity include:
Less fading loss
De-coding gain
Interference averaging
Power control based on quality
Evaluate signal level and quality
DTX
Silent transmission in speech pauses
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Methods for reducing InterferenceMethods for reducing Interference
Adaptive antenna
According to subscriber distribution, concentrate signal energy t
o certain direction.
Adaptive channel allocation
Always assign the best available channel during call setup.
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Frequency HoppingFrequency Hopping
Diversity technique
Frequency diversity can reduce fast fading effects
Useful for static or slow-moving mobiles
Cyclic base-band hopping
TRX hops cyclic between its allocated frequencies
RF hopping
Either cyclic or random hopping
Needs wideband combiner
Can use any frequency included in the MA
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Power ControlPower Control
Save battery life-time
Minimize interference
GSM : 15 steps and 2 dB for each
Use power control in both uplink and downlink triggered by level or quality
time
signallevel target level
e.g. -85 dm
Power control isn’t allowedon BCCH
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DTXDTX
DTX (Discontinuous transmission)
Switch transmitter off in speech pauses and silence periods, bot
h sides transmit only silence updates (SID frames) comfort
noise generated by transcoder.
VAD: voice activity detection
Transcoder is informed the use of DTX/ VAD
Battery saving and interference reducing
Battery saving and interference reducing
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Mobile Radio LinkMobile Radio Link
1. Radio wave propagation
2. Propagation models
3. Antenna systems
4. Diversity technique
5. Interference and interference reduction
6. Link budget
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Link Budget CalculationLink Budget Calculation
Why we need a link budget?
Which will decide the coverage range?
The coverage range is limited by the weaker one.
Two-way communication needed
link usually limited by mobile transmitting power
Desired result: downlink = uplink
Link budget shouldbe balanced
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Exercises
1. Write down the diversity techniques.
2. Write down the antenna’s main parameters.
3. Write down the method used to reduce interference.
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Answer
1.The diversity techniques are time diversity, frequency diversity,
space diversity and polarization diversity.
2.The antenna’s main parameters are lobes (main lobes, side/ba
ck lobes), front-to-back ratio, half-power beam-width ,antenna do
wntilt, polarization, frequency range, antenna impedance, mecha
nical size etc..
3.The methods used to reduce interference are frequency hoppi
ng, DTX, power control based on qulality, adaptive antenna, opti
mized channel allocation.
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Course ContentsCourse Contents
Introduction to GSM network
Mobile radio link
Network planning procedure
Advanced network planning
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Network Planning ProcedureNetwork Planning Procedure
1. Cellular planning principle
2. Network topology
3. Traffic estimation
4. Coverage planning
5. Frequency planning
6. Site selection
7. Transmission planning
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Network Planning PrincipleNetwork Planning Principle
marketing
business plan
traffic estimate
initial dimensioning
Frequency plan
transmission plan
finaltopology
parameter plan
coverage plan
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Scope of Network PlanningScope of Network Planning
Operator’s requirements
Subscriber forecasts
Coverage requirements
Quality of service
Recommended sites
Network design
Number & configuration of BSC
Antenna specifications
BSS topology
Frequency plan
Network evolution strategy
External information
Terrain data
Population data
Bandwidth available
Network performance
Gos
Margin calculations
Interference probabilities
Quality observation
Network planning Data acquisition
Site survey
Field measurement evaluation
CW design and analysis
Transmission plan
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Input DataInput Data
Maps
Main city
Important road
Location of mountain range
Inhabited area
Shore line
Local knowledge
Typical architecture
Structure of city
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Demographic DataDemographic Data
Statistical yearbook
Largest town and city
Population distribution
Where are the expected subscribers
Local knowledge
Population migration route
Traffic volume
Subscriber concentration area300 000 pop.
400 000 pop.
250 000 pop.
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Network ConfigurationNetwork Configuration
Estimate number of BTS neededVERY rough initial estimation :
total operator’s bandwidth
planned freq. reuse rate
number of BTS needed for traffic reasons
Evaluate achievable cell coverage range=f (topography, requirements, signal levels,
environment, ...)
number of BTS needed for coverage reasons
= average number of TRX allowed per cell
Finances Marketing
Planning
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Network PlanningNetwork Planning
1. Cellular planning principle
2. Network topology
3. Traffic estimation
4. Coverage planning
5. Frequency planning
6. Site selection
7. Transmission planning
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Network TopologyNetwork Topology
Umbrella cell Macro cell Micro cell Pico cell
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Macro Cell NetworkMacro Cell Network
Cost performance solution
Suitable for covering large area
Large cell range
High antenna position
Cell ranges 2 ..20km
Used with low traffic volume
Typically rural area
Road coverage
Normally Use omnidirectional antenna
Exception: Use beamed antenna for road coverage
2..20 km
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Micro Cell NetworkMicro Cell Network
Capacity oriented network
Suitable for high traffic area
Mostly used with beamed cell
Cost performance solution
Usage of available site’s equipment
Typical application
Medium town
Suburb
Typical coverage range: 0.5 .. 2km
0,5 .. 2km
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Cell coverage rangeCell coverage range
Achievable cell coverage depend on
Frequency band (450, 900, 1800 MHz)
Surroundings and environment
Link budget figure
Antenna type
Antenna direction
Minimum required signal level
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Hexagons and CellsHexagons and Cells
Three cells ( three hexagons)
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Network Planning ProcedureNetwork Planning Procedure
1. Cellular planning principle
2. Network topology
3. Traffic estimation
4. Coverage planning
5. Frequency planning
6. Site selection
7. Transmission planning
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Traffic EstimationTraffic Estimation
Estimate number of subscribers
Long-term prediction
Forecast Subscribers
Expected traffic load per subscriber
Particular habits of subscribers
Busy hour conditions
Busy hour of the day
Traffic patterns
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Traffic PlanningTraffic Planning
Estimation of expected traffic
Number of subscribers in area
Traffic load per subscriber
Coverage
==> traffic per sq.km
==> traffic per cell
==> number of TRX needed per BTS
Allow extra capacity for roamer and busy hour traffic
Transmission should not be the bottleneck of the system
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Traffic PatternsTraffic Patterns
Traffic varies between different hours, estimated traffic must
be able to satisfy the peak loads. Busy hour traffic is typically
twice that of the average.
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 hr
%
peak hour
off-peak
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Network Planning ProcedureNetwork Planning Procedure
1. Cellular planning principle
2. Network topology
3. Traffic estimation
4. Coverage planning
5. Frequency planning
6. Site selection
7. Transmission planning
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Coverage PlanningCoverage Planning
external inputs:(traffic, subs. forecast,coverage requirements...)
Initial network dimensioning TRXs, cells, sites bandwidth needed NW topology
nominal cell plansuggestions for site locations cell parameters coverage achieved
coverage prediction signal strength multi-path propagation
coverage, ok?
site acquisition
site accepted ?
real cell planfield measurements
planningcriteria fulfilled?
N
N
N
create celldata forBSC
go tofrequency planning
Y
Y
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Coverage RequirementsCoverage Requirements
Rollout phases and time schedules
Coverage requirement
Agree on min. level for outdoor coverage
Loss requirement
Indoor coverage area
Mobile classes
Operator’s cell deployment strategies
Omni-cell site in rural area
Directional site in urban area
phase 1CW launch
rolloutphase 2
rolloutphase 3
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Coverage PlanningCoverage Planning
Loss
Due to coverage
Due to interference
Full coverage of an area can hardly be guaranteed ! common values: 90~95%
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Network planningNetwork planning
1. Cellular planning principle
2. Network topology
3. Traffic estimation
4. Coverage planning
5. Frequency planning
6. Site selection
7. Transmission planning
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Frequency PlanningFrequency Planning
Why we reuse the frequency?
8 MHz = 40 channels * 8 timeslots = 320 users
==> max. 320 simultaneous calls!!!
Limited bandwidth
Interference are unavoidable
Minimize total interference in network
Use calculated propagation prediction for frequency allocation
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Frequency PlanningFrequency Planning
Target
Find solution to minimize interferences in the network
Traditional method
Hexagonal cell patterns
Regular grid
Cluster sizes
Frequency reuse distance:
D = R *sqrt(3*cluster-size) R
D
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Frequency PlanningFrequency Planning
Frequency planning always consider the following case
Actual situation is different.
Power control, actual traffic and distribution of subscribers.
Average frequency reuse rate is a criteria for good allocation
scheme:
practicallimit
safe, butuneconomical
physicallimit
0 10 20
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Frequency ReuseFrequency Reuse
Reuse frequency as often as possible
Increase network capacity
But maybe cause some interference
Consideration for frequency reuse
Interference matrix calculation
Propagation model tuning
Minimize total interference in network
R
D
f2
f3
f4f5
f6
f7
f3
f4f5
f6
f2
f3
f4f5
f6f2
f3
f4f5
f6
f7
f2
f3
f4f5
f7
f2
f3
f4f5f2
f3
f4f5
f6
f7
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Multiple Reuse RateMultiple Reuse Rate
Frequency reuse rate
measurement criteria for effectiveness of frequency plan
Co-relationship : effectiveness interferences
Interaction with coverage planning
Multiple reuse rate increase effectiveness of freq. plan
1 3 6 9 12 15 18 21
safe planning(BCCH layer)normal planning
(TCH macro layer)
tight reuse planning (tight layer)
same frequencyin every cell(spread spectrum)
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Multiple reuse rateMultiple reuse rate
Capacity increase with multiple reuse ratee.g. network with 300 cells
bandwidth : 8 MHz (40 radio channels)
Single reuse (4X3)Network capacity = 40/12 * 300 = 1000 TRX
Multiple reuse:BCCH layer: reuse =14, (14 freq.)
normal TCH: reuse =10, (20 freq.)
tight TCH layer: reuse = 6, (6 freq.)
==> Network capacity = (1 +2 +1)* 300 = 1200 TRX
cap NBW
re usei
i
.
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Network Planning ProcedureNetwork Planning Procedure
1. Cellular planning principle
2. Network topology
3. Traffic estimation
4. Coverage planning
5. Frequency planning
6. Site selection
7. Transmission planning
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Site LocationSite Location
Cell performance has a close relationship with site location
Site is long-term investment
Site acquisition is a slow process
Hundreds of sites needed per network
Site is a valuable long-term asset for the operator
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Bad Site LocationBad Site Location
Avoid hill-top location for site
Uncontrollable interference
Cross coverage
Bad handover behavior
wanted cellboundary
uncontrolled, stronginterferences
cross coverage areas:
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Good Site LocationGood Site Location
Prefer site off the hill-top
Use hill to separate cell
Contiguous coverage area
Need only low antenna height if site are slightly elevated above
valley bottom
wanted cellboundary
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Site Selection CriteriaSite Selection Criteria
Radio criteria
Good view in main beam
direction
No obstacles
Good visibility of terrain
Antenna installation situation
LOS to next microwave site
Short feeder length
Non-radio criteria
Space for equipment
Availability of leased transmission l
ine or microwave link
Power supply
Access restrictions
House owner
Rental costs
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Site Acquisition ProcessSite Acquisition Process
radio planner
fixed networkplanner
measurementteams
architect
network operator
Site selectsite owner
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Site InformationSite Information
Questionnaire Collect all necessary information about site
Site coordinates, height above sea level, exact address
House owner
Type of building
Building materials
Possible antenna heights
360deg photo (clearance view)
Neighborhood, surrounding environment
Drawing sketch of rooftop
Antenna installation conditions
Access possibilities (road, roof)
BTS location, approximately feeder lengths
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Network Planning ProcedureNetwork Planning Procedure
1. Cellular planning principle
2. Network topology
3. Traffic estimation
4. Coverage planning
5. Frequency planning
6. Site selection
7. Transmission planning
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Transmission PlanningTransmission Planning
A great portion of yearly network operational cost is
transmission maintenance cost.
Transmission planning is for minimizing the overall cost
Fixed part design
MSC
BSC Hub
BTS
BSS
BTS
BTS
BTS
Radio part design
BTS
BSS
BTS
BTS
BTS
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Transmission ConceptTransmission Concept
Transmission media
Transmission techniques
Transmission methods
Fiber
Coaxial cable
Copper cable
Microwave radioTerrestrial/satellite
PDH SDH
PCMISDN ATM
Tra
nsm
issi
on
eq
uip
men
tHDSL
CATV
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Microwave LinksMicrowave Links
Pro
Low operating costs
Easy to install
Flexible
Quick & reliable solution
High capacity transmission links, frequency range: 7~38 GHz
Normal transmission link
Needs extra frequencies
Link quality depend on weather
Not always available at ideal sites
(LOS path)
Long distance hops are problematic
Terminalstation A
Terminalstation B
Repeaterstation
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Basic Transmission TopologiesBasic Transmission Topologies
POINT-TO-POINT STAR (Concentration points)
The basic criteria for choosing transmission topologies is Costs vs. Fail Safety (redundancy).
LOOPMULTIDROP CHAIN
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Network topologyNetwork topology
Prefer centralized or decentralized network architecture
2 small BSC plus cheap transmission
1 large BSC plusexpensive transmission
MSC
BTS
BSC
BTS
BTS
BTS
BSC/ MSC
BTS
BTS
BTS
BTS
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Course ContentsCourse Contents
Introduction to GSM network
Mobile radio link
Network planning procedure
Advanced network planning
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Advanced Network PlanningAdvanced Network Planning
1. Network evolution
2. Indoor coverage
3. Tunnel coverage
4. Parameters
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Cell EvolutionCell Evolution
Umbrella Cell5-50KmEarly 80’s
Macro Cell1-5KmMid-end 80’s
Micro Cell100m-1KmMid 90’s
Pico Cell10m-100mMid-end 90’s
Macro Cell Layered Network
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Layered NetworkLayered Network
High layer station
Middle layer stationMiddle layer station
Indoors stationIndoor station
Indoors station
Low layer station Low layer station Low layer stationLow layer station
Indoors station
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Network Capacity evolutionNetwork Capacity evolution
Measure for network spectrum efficiency
Erl/ (MHz * sq.km)
A function of
Bandwidth
Frequency efficiency of technology
Frequency reuse
Cell size
Frq. hoppingFrq. hopping
DTXDTX
DirectedRetry
DirectedRetry
PowerControl
PowerControl
Half-ratecode
Half-ratecode
Loaddistribution
Loaddistribution
Load HOLoad HO
multiple cellcoverage
multiple cellcoverage
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Advanced Network PlanningAdvanced Network Planning
1. Network evolution
2. Indoor coverage
3. Tunnel coverage
4. Parameters
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Why IndoorsWhy Indoors
Indoor coverage become the main competition between operators
Subscribers expect continuous coverage and better quality
Outdoor cell can’t provide sufficient indoor coverage
INDOOR SOLUTION
Good Quality!
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BenefitsBenefits
Low Transmission Powers (BTS/MS)
Dedicated Indoor Solution
Good Quality
Safety
MS Battery Life-time
Office Equipment
Less Interference
Continuous Coverage
Subscriber expectation
Continuous Service
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Building Penetration LossBuilding Penetration Loss
Signal level in building is estimated by using a building
penetration loss margin
Big differences between rooms with window and without
window(10~15 dB)
rear side :-18 ...-30 dB
Pref = 0 dB
Pindoor = -3 ...-15 dB
Pindoor = -7 ...-18 dB
-15 ...-25 dB no coverage
signal level increases with floor number :~1.5 dB/floor (for 1st ..10th floor)
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Building Penetration LossBuilding Penetration Loss
Signal loss for penetration varies between different building
materials, e.g.: mean value
reinforced concrete wall, windows 17 dB
concrete wall, no windows 30 dB
concrete wall within building 10 dB
brick wall 9 dB
armed glass 8 dB
wood or plaster wall 6 dB
window glass 2 dB
Total building loss = median values +
superimpose standard deviations +
(lognormal) margin for higher probabilities
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In-Building Path LossIn-Building Path Loss
Simple path loss model for in-building environment
Outdoor loss: Okumura‘s formula
Lout = 42,6 + 20 log( f ) + 26 .. 35 log( d )
Wall loss
Lwall = f (material; angle)
Indoor loss: linear model
For Pico-Cells
Lin = L0 + d d
building type loss application example
old house 0,7 dB/m (urban l)
commercial type 0,5 dB/m (modern offices)
open room, atrium 0,2 dB/m (museum, train station)
Lout
Lwall
Lin
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Indoor Coverage SolutionsIndoor Coverage Solutions
Small BTS
Mini BTS
Repeater
Active
Passive
Optical
Antennas
Distribute antenna
Leaky cable
Signal distribution
Power splitter
Optical fiber
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Indoor PlanningIndoor Planning
Example2:1.2 MHz allocation50 mErl/subscriber , GOS=2%reuse per two floor, separate frequencies within one floor:a) three floors
52.12 Erl => 842subsb) ten floors
140 Erl => 2808 subs
Example1:1.2 MHz allocation50 mErl/subscriber, GOS=2%no frequency reuse:
a) three floors
34.68 Erl=> 694 subscribersb) ten floors
34.68 Erl => 694 subscribers
Single cell approach Multi-Cell approach
t
f5
f6
f5
f1
f2
f1
f3
f4
f3f1..f6
f1..f6
f1..f6
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Leaky cableLeaky cable
Coaxial cable with perforated leads
Radiating loss 10~40 dB per 100m
Coupling loss typically 55 dB (at 1m)
Produce constant field-strength along cable runs
Work at wide-band
Radiating loss become higher with high frequency
Very large bending radius
Formerly often used for tunnel coverage
Expensive
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Indoor Coverage ExamplesIndoor Coverage Examples
With Repeater
Relay outdoor signal into target building
Need donor cell, add coverage but not capacity
With indoor BTS and distributed antenna
Heavy loss bring by power splitting and cable
1:1
50m
50m
1:1
50m
50m
1:1
50m
50m
1:1
50m
50m
1:1
50m
50m
1:1
1:1:1
1:1
4th floor
3rd floor
2nd floor
1st floor
ground floor
Outdoor AntennaGain: 18 dBi
Indoor AntennaGain: 9dBi
Target Indoor Coverage Building
7/8'' Cable Loss: 4dB / 50mCable length : 25m
-50 dBm
4th Floor
3rd Floor
1st Floor
Ground Floor
2nd Floor
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RepeaterRepeater
Types of Repeater
According to operating frequency
Wide-band Repeater
Narrow-band Repeater
According to working method
Passive Repeater
Needs strong external signal, useful only with
very short cables and seldom used
Active Repeater
Amplify and re-transmits all received signals
needsdecoupling > amplification
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RepeaterRepeater
Application examples
Coverage for low traffic area
Remote valley
Tunnel
Underground coverage
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The Bulb PrinciplesThe Bulb Principles
Several smaller sites provide more indoor coverage area than a single large site
... is better than ...
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Newspaper PrinciplesNewspaper Principles
The newspaper-principle
Indoor coverage may be expected in locations where there is no enough daylight to read a newspaper comfortably
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Advanced Network PlanningAdvanced Network Planning
1. Network evolution
2. Indoor coverage
3. Tunnel coverage
4. Parameters
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Wave Propagation in TunnelsWave Propagation in Tunnels
Ideal antenna position: center of cross-section
Distance to walls: min. 2λ
Tunnel cross-section shape unimportant, if λ > 10
Time dispersion decreases with distance
Install antenna 50~100m before tunnel entrance
Good signal coupling between successive tunnels
Tunnels are very suitable environment for radio wave propagation
Tunnels are very suitable environment for radio wave propagation
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Tunnel Cross-SectionTunnel Cross-Section
Filling factor determines propagation condition
Typical range for filling factors
Road tunnels: 10%
Metro: 60~90%
filling factor =----------
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Advanced Network PlanningAdvanced Network Planning
1. Network evolution
2. Indoor coverage
3. Tunnel coverage
4. Parameters
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BSS ParametersBSS Parameters
BSS Relevant Parameter for Network Planning
Frequency allocation plan
Logical radio configuration
Transmitting power
Definition of neighboring cells
Definition of location areas
Handover parameters
Power control parameters
Cell selection parameters
Radio link time-out counter
Topology of BSC- BTS network
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Handover TypesHandover Types
Intra-cell same cell but different carrier or timeslot
Inter-cell different cells (normal case)
Inter-BSC different BSC
Inter-MSC different MSC
Inter-PLMN (technically feasible, not supported)
Intra-cell
Inte-rcell
inter-BSC
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Handover CriteriaHandover Criteria
1. Interference, UL and DL
2. Bad C/I ratio
3. Uplink Quality
4. Downlink Quality
5. Uplink Level
6. Downlink Level
7. Distance
8. Rapid Signal Drop
9. MS Speed
10. Power Budget
11. Good C/I ratio
12. PC: Lower quality/level
thresholds (DL/UL)
13. PC: Upper quality/level
thresholds (DL/UL)
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Location Area DesignLocation Area Design
Location update affects all mobiles in network
Location update in idle mode
Location update after call completion
Location update brings extra burden to the network
Good location area design should avoid ping-pong
location update
Location area 1
Location area 2major road
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Paging VS Location update TrafficPaging VS Location update Traffic
PagingLocation update
# of cells in Loc. area
signalingtraffic
optimum numberof cells in Loc. area
function of user density,cell size, call arrival rate ...function of
user mobility
minimize signaling traffic
optimum varies with network evolution
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Exercises
1. Write down the network evolution process.
2. Write down solution and equipment for indoor coverage.
3. Write down the types of handover.
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Answer
1.The network evolution process is: Umbrella cell-> Macro cell -
>Micro cell->Picro cell
2. The solution and equipment for indoor coverage are: M
ini BTS, Repeater, antennas( distribute antenna, leaky ca
ble), signal distribution( power splitter, optical fiber).
3.The handover types are: Inter BSC, Intra BSC, Intra cell, Inter
cell, Inter MSC and Intra MSC.
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