atoll 3.1.2 gsm gprs edge afp
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7/22/2019 Atoll 3.1.2 Gsm Gprs Edge Afp
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Training Programme
1. Requirements
2. Configuring the Atoll AFP model
3. Running the AFP
4. Analysing the new Frequency Plan
5. Process Summary
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Requirements Overview
Define Transmitters to be allocated and/or taken into account
Focus & Computation zones
Filtering Zones
Active Transmitters
Define Resources
Frequency, BSIC and HSN domains creation
Set Network Parameters
Transmitters Level (BSIC, Weight, Locking options)
Subcells Level (Frequency Domain allocation, Required TRXs, Traffic Load, C/I threshold, ...)
TRXs Level (Locking options)
Neighbour Plan
Import a Neighbour plan
Interference Matrices
Calculate / Import an Interference Matrix
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Requirements: Resources
Define Transmitters to be allocated and/or taken into account
Focus & Computation zones
• Recommendation: if using both of them, put focus zone within computation zone
Filtered and Active Transmitters
Define Resources
Frequency Domain
BSIC Domain
HSN Domain
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Requirements: Radio Parameters Settings
Set Network Parameters (dealing with AFP)
Transmitters Level
• Weight [AFP tab]
• Locking options [AFP tab]
• BSIC domain allocation [TRXs tab]
Subcells Level
• Frequency Domain Allocation• Excluded channels
• Required TRXs
• Reception threshold
• C/I threshold
• Traffic Load
• Hopping Mode
• Weight
TRXs Level
• Locking options
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Set Transmitters Parameters
BSIC Domain allocation
To define BSICs that can be assigned
Weights
To increase or decrease importance of Transmitters during AFP
Locking options
To keep an existing allocation
Possibility to keep:
• Channel(s) (and MAIO) assigned to TRXs
• allocated HSN
• Allocated BSIC
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Set Subcells Parameters (1/3)
A- Frequency Domain Allocation*
Among the ones defined by users (see slide 4)
B- Excluded Channels
Channels that cannot be allocated (border coordination for example)
C- Required TRXs*
Number of “physical” TRXs to be created
D- DL Traffic Load*
Represents the TRX usage rate (Timeslots used / Timeslots available)
E- Reception Threshold*
Minimum reception level (if signal level lower than this, then no service)
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A B C D E F G H I J K L
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Set Subcells Parameters (2/3)
F- C/I Threshold*
Minimum signal quality (if C/I lower than this, then signal is considered as interfered)
G- % max interference*
Maximum level of interference allowed within each service area
H- AFP weight
To increase or decrease importance of subcells during AFP
• By default: BCCH weight = 2 and TCH weight = 1
I- Hopping Mode*
Three modes: Non Hopping OR Base Band Hopping OR Synthesized Frequency Hopping
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A B C D E F G H I J K L
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Set Subcells Parameters (3/3)
J- Allocation Strategy
The allocation strategy used during manual or automatic frequency planning. There are two
available allocation strategies:• Free: Any of the channels belonging to the frequency domain can be assigned to TRXs.
• Group Constrained: Each TRX will be assigned one of the groups defined in the frequency domain.
You can use the Preferred Frequency Group to define the preferred group of frequencies when using
the AFP
K- Max MAL Length
The maximum length of the mobile allocation list (MAL). In other words, the maximum numberof channels allocated to the TRXs of the subcell during Automatic Frequency Planning if the
Hopping Mode is either SFH or BBH
L- HSN domain*
The hopping sequence number (HSN) domain of the subcell
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A B C D E F G H I J K L
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Requirements: Neighbour Plan (1/2)
Possibility to copy/paste or to import a list of neighbours
Prerequisites
A text file with at least 2 columns
• Name of the reference cells
• Name of neighbour cells
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Requirements: Neighbour Plan (2/2)
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Requirements: Interference Matrix (1/3)
Calculation of Interference Matrices
Computation of C/I probabilities between pairs of victim/interferer subcells (for hypothetic co-
channel interferences)
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Interference probability defined
in % of interfered area or traffic
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Import of Interference Matrices
Loading of ASCII files containing C/I probabilities between pairs of victim/interferer subcells,
coming from OMC statistics or measurement analysis
Requirements: Interference Matrix (2/3)
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4 formats supported• Clc : per pair of subcells, 1 histogram containing the
probabilities of having certain values of C/I, formatted in
columns (dictionary file .dct mandatory)
• Im0 : per pair of subcells, 1 histogram containing the
probabilities of having certain values of C/I, formatted in rows
• Im1 : per pair of subcells, 1 histogram containing the
probabilities of having certain values of C/I, formatted in
columns (no dictionary file needed)
• Im2 : per pair of subcells, 1 Interference Matrix containing
the probabilities of having C/I value lower than the min C/I
threshold defined in the victim’s subcell.
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Requirements: Interference Matrix (3/3)
Interference Matrices properties
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Displays the Interference Matrix
scope and statistics
Definition of theinterference type
User-defined parameters, set
according to the Interference
Matrix type
(Used by the AFP model for
the matrix combination)
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Configuring the Atoll AFP model (1/2)
Overview
Goal and principle of the AFP
• Find optimal allocations that minimise interferences over the network and comply with a set of
constraints (separation, frequency domain limitation)
• Convergence criterion based on a cost function
• The AFP model tries to minimise the value of the cost function
Meaning of the Cost Function
• Function that enables to evaluate/compare different Frequency Plans
• Principle of this function is to check for each TRX of the loaded network if its allocated Frequency is
“good”.(i.e. if this frequency is not interfered by another TRX of the network and complies with pre-
defined separation constraints)
• IF the frequency is NOT GOOD (interfered or separation violation) THEN a cost (penalty) will be
assigned to this frequency
• IF the frequency is GOOD (not interfered and fulfil separation rules) THEN the cost (penalty) will
be null
• Based on two main components:
• States in “Interfered Erlangs”
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i i i TRX
ViolationSeparation
TRX
ceInterferen
TRX
Total CCC
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Configuring the AFP model = Defining how is the Cost calculated
Cost calculation (for a single TRX)
Calculated for the entire loaded network, TRX per TRX
Configuring the Atoll AFP model (2/2)
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iiiii TRX
ulation Inter
TRX
DomainOut Freq
TRX
TRX Corrupted
TRX
TRX g Mis
TRX
Total mod _ _ _ _ sin CCCCC
iiii TRX
Groupeferred Out
TRX
TRX Modified
TRX
ViolationSeparation
TRX
ce Interferen _ Pr _ _ _ CCCC
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Description of the Cost Function (1/6)
Based on 8 components
1. Cost component due to separation violations
• Estimation for each TRX
• Based on costs specified for the required separations
• Cost of a TRX is limited to 100% of the TRX traffic
• Possibility to weight this cost component among the other components
• Possibility to weight individually each involved TRX according to the violation type within the overall
separation violation cost component
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Description of the Cost Function (2/6)
Based on 8 components
2. Cost component due to interference
• Estimation for each TRX
• Interference criterion based on interference matrices
• Possibility to combine matrices coming from different sources (OMC statistics,
measurements, planning tool, etc.)
• Interference is considered when the C/I level between pairs of subcells is lower than the
victim min C/I threshold
• Distance criterion based on inter-transmitter distance
• Weighted according to transmitter azimuths
• Cost of a TRX is limited to 100% of the TRX traffic
• Possibility to weight each criterion
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Description of the Cost Function (3/6)
Based on 8 components
3. Cost component due to modified TRXs
• For each modified TRX, a cost is added to the total cost
• Possibility to activate or not this component
• Possibility to modify the cost value
4. Cost component due to TRXs out of their preferred frequency group
• For each TRX allocated out of the preferred frequency group defined in its subcell, a cost is added to
the total cost
• Possibility to activate or not this component
• Possibility to modify the cost value
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Description of the Cost Function (4/6)
Based on 8 components
5. Cost component due to missing TRXs
• For each missing TRX, a tax is imposed per traffic timeslot and is added to the total cost
• Possibility to activate or not this component
• Possibility to modify the tax value
6. Cost component due to TRXs out of their frequency domain
• For each TRX allocated out of the frequency domain defined in its subcell, a tax is imposed per traffic
timeslot and is added to the total cost
• Possibility to activate or not this component
• Possibility to modify the tax value
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Description of the Cost Function (5/6)
Based on 8 components
7. Cost component due to corrupted TRXs
• A TRX is corrupted when:
• More than one frequency is assigned to a non hopping TRX
• A TRX in SFH does not have any MAIO
• No channel is assigned to a TRX• …
• For each corrupted TRX, a tax is imposed per traffic timeslot and is added to the total cost
• Possibility to activate or not this component
• Possibility to modify the tax value
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Description of the Cost Function (6/6)
Based on 8 components
8. Cost component due to Intermodulation
• This cost component has the goal of avoiding the cases were intermodulation can cause problems.
• The Tax is applied when the combination of allocated frequencies generates a frequency already
allocated within the same site.
UL and DL frequencies are evaluated: each ARFCN carrier number refers to 2 physical frequencies:
the uplink frequency and the downlink frequency. The translation function from ARFCN to frequency is
given by the ARFCN standard.
• Possibility to activate or not this component
• Possibility to modify the tax value
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Properties of the Atoll AFP Model (1/11)
Description of the Cost tab
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Possibility to dismiss TRXs
which the cost is lower than
the quality target defined at
the subcell level
Cost of violation
separations
• Weight of the cost
component
• Weight per separation
violation type in the next
tab
Cost due to interferences
• Weight of the interferencecriterion
Costs of missing, out of
domain and corruptedTRXs
• Tax value
• Possibility to consider or
not this components
Cost of modified TRXs
• Cost per modified TRX
• Possibility to consider ornot this component
Cost of TRXs allocated out
of their preferred frequency
group
• Cost per modified TRX
• Possibility to consider or
not this component
• Preferred groups
allocated by the AFP if
pattern are allocated
Optimisation of number of
TRXs
• Parameter used with the
“Optimised” strategy
Cost due to intermodulation
• Weight of the cost
component
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Properties of the Atoll AFP Model (2/11)
Description of the Separations tab
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Cost of violationseparations
• Cost of a separation “k”
when a separation “s” is
required
• Stated in % of interfered
traffic
Weight on the separation
cost according to the
violation type
• Violation within co-cells
• Violation within co-site
transmitters
• Violation between
neighbours
• Violation within co-
subcells
• Violation betweenexceptional pairs of
transmitters
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Properties of the Atoll AFP Model (3/11)
Description of the Interference Matrices tab
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Matrix combined using
weights calculated by
multiplying three
components :
• Component quantifying
the membership to the AFP
scope (as defined in the
properties of each IM)
• Component depending on
the Interference Matrix type
Recommendation:
do not change those
values:
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Properties of the Atoll AFP Model (4/11)
Description of the Interference Matrices tab
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Interference Matrices
based on propagation
Basic component weighted
by the IM resolution and
the model standard
deviation
Interference Matrices
based on OMC statistics
Basic component weighted
by the duration statistics
were performed
Interference Matrices
based on OMC statistics
Basic component weighted
by the Interference Matrix
standard deviation (defined
in its properties) and the
amount of measured points
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Properties of the Atoll AFP Model (5/11)
Description of the HSN tab
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Possibility to allocate:
– Different HSNs to pairs of
subcells which mutually
interfere
– The same HSN to all thesubcells of a transmitter or
a site
– HSN freely with respect
to directives specified in
the MAL tab (target
fractional load and
frequency reuse)
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Properties of the Atoll AFP Model (6/11)
Description of the MAL tab
Frequency reuse ratio
• Not directly linked to the reuse pattern
• Useful only in case of SFH
• Higher priority than the target fractional load
Fractional Load
• For a set of synchronised subcells sharing the same MAL, HSN and frequency domain
• Useful only in case of SFH
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i
i
MALtheinsfrequencie#
MALgivenawithTRXs#
domaintheinsfrequencie#
sizeMAL
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Properties of the Atoll AFP Model (7/11)
Description of the MAL tab
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MAL length
(with priority order)
For the “group constrained”assignment mode (only)
– MAL = one of the groups
defined in the related
frequency domain
For any other assignment mode
– Allocate the maximum
MAL length (specified inthe subcell properties)
– Adjust the MAL length so
as to fulfil the directives 3,
4 and 5.
– 4. And 5. Directives :
target domain use ratio,
MAL length strategy andtarget fractional load
– Taken into account only if
the option “adjust MAL
length” is selected
– HSN assignment and
MAL size determination are
performed so as to obtain
the specified targets
MAL allocation type
– Possibility to assign the
same MAL or different ones
to all the subcells of a
synchronised set
– Different MAL is
recommended if a typical
pattern (e.g. 1x3) has to be
allocated
Parameter which can be
automatically calibrated by
the AFP model
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Properties of the Atoll AFP Model (8/11)
Description of the Finalisation tab
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Result assignment
– Manual assignment after
the allocated frequency
plan has been verified bythe user. This allocation
may only be partly
committed
– Automatic allocation of
the best obtained
frequency plan in term of
total cost (useful with auto-
save or any automaticprocedure run with Atoll
(e.g. Macros)
Target computation time
– Fixed duration : the AFP
stops when the user-
defined duration hasfinished
– Directive duration : the
AFP will adapt its method
according to this duration.
In the case of large
networks or insufficient
spectrum, this duration
may be exceeded (defaultoption)
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Properties of the Atoll AFP Model (9/11)
Description of the Reuse tab
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Directives on the MAIO
spacing
– Staggered: the MAIOs
assigned to TRXs of a
subcell are evenly spaced
– Free: no constraint
BSIC allocation strategy
– Minimal: the AFP
consumes a minimum
number of BSICs. The
same BSICs will be reused.
– Maximal and
homogeneous: the AFP
uses as many BSICs as
possible. The chosen
BSICs are evenly
distributed in the whole
domain.
Pattern allocation
User-defined scheme
considered only if the cost
component due to TRXs
out of their preferred group
is active and is the pattern
option is checked when
running the AFP
Channel spacing
– Automatic (lowest cost)
– Maximum spreading
– Minimum spreading
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Properties of the Atoll AFP Model (10/11)
Description of the Protection tab
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Interference definition
– Rigid
– Intermediate – Flexible
Additional adjacent channel
protection in interference
cost
• None : as defined in Atoll
interface (default -18 dB
compared to co-channel)
• Weak : + 1.5 dB (e.g.
16.5 dB)
• Strong (e.g. 15 dB)
Weight of the distance
criterion
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Properties of the Atoll AFP Model (11/11)
Description of the Advanced tab
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Interferer diversity gain(dB)
(Used in case of frequency hopping)
• Models the geographic
diversity of interferers
• Considered in the
interference and separation
cost components
• Depends on the MAL
length
Gain due to low timeslotuse ratio (dB)
• Considered or not
• Used only in case of
interferers supporting DTX
• Considered in the
interference cost
component
• Calculated from a formula
taking into account the
voice activity factor and if
hopping or notFrequency diversity gain
(dB)
(Used in case of frequency
hopping)
• Models the gain due todiversity of multi-path
effects
• Considered in the
interference cost
component only
• Depends on the MAL
length
Model experience
• Possibility to keepnetwork learning
parameters of the model in
the project
• Possibility to archive this
experience in database for
multi-user AFP
management
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AFP tuning
Possibility to have several tuned AFP models
After the learning phase of a reference environment, the AFP can tune internal parameters
You can duplicate the AFP model as many times as you wish
Possibility to archive in database if experienced is conserved (Advanced tab)
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Training Programme
1. Requirements
2. Configuring the Atoll AFP model
3. Running the AFP
4. Analysing the new Frequency Plan
5. Process Summary
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Overview
Possibility to start an AFP on all the transmitters, on a group of transmitters, or on a
single transmitter
Resources that can be allocated
Channels in case of non hopping
Channels and HSNs in case of BBH
MALs, MAIOs and HSNs in case of SFH
BSICs
Step by step initialization
Select involved items (AFP model, resources to be allocated, Interference Matrix, ...)
Define separation constraintsDefine locking, traffic load, DTX and reuse distance options
Define Target Computation Time
Run the AFP and display information during progress
Analyse results
Commit the new frequency plan
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Before Starting
Before running the AFP allocation, check:
Zones (Filtering, Computation and Focus) definition
Transmitters & Subcells parameters settings
Save current Frequency Plan (if any) from TRXs table
Neighbours Table not empty
Activate/Deactivate Interference Matrices
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Confidential – Do not share without prior permission
Automatic Frequency Planning Process (1/14)
1st Step : Involved Items
Planning of different resources
User-defined strategies
Possibility to allocate AFP indicators
Selected AFP
model
Resources to
be allocated
Possibility to allocate
additional indicators
(depending on the model)
Possibility to run specific
allocation strategies
(depending on the model)
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2nd Step : Separation Constraints
Definition of inter-channel separation constraints
• Exceptional pairs
• Co-site, co-cell and neighbours distinction
• Traffic and control subcell distinction
Automatic Frequency Planning Process (2/14)
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Default
separation
rules
Highest priority separation
rules (relax or increase the
default separation
constraints
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3rd Step : Advanced AFP Settings
Selection of the subcell type to be allocated
• Only selected types may have their TRXs created or re-allocated
• Other subcells are considered locked for this allocation
Possibility to lock existing TRXs regarding to their TRX type
Traffic load source (user-defined or from the default capture)
Consideration or not of the DTX mode (+ voice activity factor)
Consideration or not of the reuse distance constraint on channels and BSICs
• If available, the AFP takes into account the transmitter reuse distance (optional field to be added to the
Transmitters table), Otherwise, it will consider the default reuse distance
Automatic Frequency Planning Process (3/14)
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3rd Step : Advanced AFP Settings
Automatic Frequency Planning Process (3/14)
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Automatic Frequency Planning Process (4/14)
4th Step : Loading and Checking The Network
Network loading
• The transmitters to be allocated : “TBA” transmitters
• Active and filtered transmitters which belong to the transmitters folder for which the AFP was
launched and to the focus zone (if existing or otherwise to the computation zone) as well
• The potential interferers with TBA transmitters if the option “load all interferers propagating in the focuszone” (or in the computation zone if not defined)
• The transmitters involved in the specified separation conditions with TBA transmitters
• Neighbours, co-site transmitters, transmitters or subcells of exceptional pairs, neighbours of
neighbours in case of BSIC allocation
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Automatic Frequency Planning Process (5/14)
5th Step : Last Settings Before Starting AFP
The strategy used by the
AFP model depends on the
specified time
The path to a solution is
initialised by a seed
number
Network consistency checking
• Non-blocking warnings : values
out of range, inconsistencies of the
existing allocation
• Blocking errors : empty domains
Event viewer
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Automatic Frequency Planning Process (6/14)
6th Step : Verifying AFP Progress
AFP progress dialogue – General tab
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AFP time progress
AFP real time cost
evolution
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Automatic Frequency Planning Process (7/14)
6th Step : Verifying AFP Progress
AFP progress dialogue – Quality Indicators tab
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Costs and components of all
the solutions having improved
the frequency plan
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6th Step : Verifying AFP Progress
AFP progress dialogue – Distributions tab
Automatic Frequency Planning Process (8/14)
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Initial and best cost
distributions of frequencies
Initial and best usages of
frequencies
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Automatic Frequency Planning Process (9/14)
7th Step : Analysing Allocation Results
AFP output dialogue : Summary tab
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Initial and final AFP cost given
in term of correctly served
traffic (Total traffic – Total cost)
AFP Time information
Costs and components of all
the solutions having improved
the frequency plan
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7th Step : Analysing Allocation Results
AFP output dialogue : Allocation tab
Automatic Frequency Planning Process (10/14)
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Possibility to
resume or assign
the obtained
frequency plan
AFP Allocation
Result Grid
Event Viewer
Summary
AFP results
options
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7th Step : Analysing Allocation Results
AFP output dialogue : results grid of the allocation tab
Automatic Frequency Planning Process (11/14)
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Resource coloured according
to its allocation status
Information on separation
violation
Possibility to delete or keep
existing/initial allocation
Allocated resources
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Automatic Frequency Planning Process (12/14)
7th Step : Analysing Allocation Results
AFP output dialogue : result options of the allocation tab
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Information to be displayed
in the allocation grid
Reset plan to previous one
Export results in text files
Deletion of TRXs violating
separation constraints
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7th Step : Analysing Allocation Results
AFP output dialogue : Subcells tab
Automatic Frequency Planning Process (13/14)
Cost components and AFP
indicators (possibly
depending on the selected
strategy when having run
the AFP) before and after
the allocation
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7th Step : Analysing Allocation Results
AFP output dialogue : Distributions tab
Automatic Frequency Planning Process (14/14)
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Initial and final cost
distributions of frequencies
Initial and final usages of
frequencies
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Training Programme
1. Requirements
2. Configuring the Atoll AFP model
3. Running the AFP
4. Analysing the new Frequency Plan
5. Process Summary
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Analysing a new Frequency Plan
Interactive Frequency Planning
And also...
Find on Map Tool
Channels distribution histogram
Interference Predictions
Point Analysis Tool
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Interactive Frequency Planning Overview
Aim : verify the current frequency allocation
For each single transmitter• Interactively propose alternative solutions to the current allocation
• Addition of new TRXs by selecting the most appropriate channel(s)
Selection of an available AFP model
Use of an AFP license
Use of the settings of the selected AFP modelUse of the active Interference Matrices
AFP : selection of channels according to the lowest overall cost over all the network
IFP : selection of channels according to the lowest cost obtained on the selected transmitter
Powerful graphic user interface
Variable thickness arrows to each interfered or interfering transmitterThickness defined according to interference probability
Possibility to filter transmitters according to their contribution to the AFP cost
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All i d Ch l A l i (1/5)
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Allocation and Channel Analysis (1/5)
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IFP running
command on the
selected subcell
Selection of a
transmitter and
a TRX type
Selection of
an AFP
model AFP properties,
settings and
related tables
All ti d Ch l A l i (2/5)
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Allocation and Channel Analysis (2/5)
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Selected subcell
actual allocation
Alternative
allocations and
associated cost
Filtering
according to
components and
probabilities
AFP cost
components and
indicators
All ti d Ch l A l i (3/5)
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Allocation and Channel Analysis (3/5)
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Selected subcell
actual allocation
Alternative
allocations and
associated cost
AFP cost
components and
indicators
Filtering
according to
components and
probabilities
All ti d Ch l A l i (4/5)
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Allocation and Channel Analysis (4/5)
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Selection of an
alternative channel
Commit of the new
channel allocation
All ti d Ch l A l i (5/5)
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Allocation and Channel Analysis (5/5)
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Selection of a
different subcell
Case of 1 missing
TRX
Actual considered
item (new TRX)
Commit of the TRX
creation
Selection of the channel to
be assigned to the new
TRX
I t f M t i A l i
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Interference Matrix Analysis
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Using the same
interface, possibility
to analyse the IM
probabilities for a
given subcell
Analysis in case the
selected subcell is
either victim or
interferer
Probability given forco-channel or
adjacent channel
interferences
Victim or interferer
filtering
Interference
probabilities
N t k C i t Ch ki
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Network Consistency Checking
Tool to check the consistency of a network
Recommended after an automatic or manual allocation Available by selecting frequency plan and audit… in the transmitters folder context menu
Consistency checking performed on
The active and filtered transmitters which belong to the transmitters folder for which the audit
was launched and to the focus zone (if existing or otherwise to the computation zone) as well
:“TBA” transmitters The potential interferers with TBA transmitters if the option “load all interferers propagating in
the focus zone” (or in the computation zone if not defined)
The transmitters involved in the specified separation conditions with TBA transmitters
(neighbours, co-site transmitters, transmitters or subcells of exceptional pairs, neighbours of
neighbours in case of BSIC allocation)
Systematic checkingUnique BCCH TRX per transmitter, consistency TRXs/cell types, …
Additional checking on frequencies, HSNs and/or BSICs
Domains compliance, separation constraints, no empty domain, (BSIC-BCCH) checking, …
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Find On Map Tool (1/4)
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Find On Map Tool (1/4)
Tool to visualise channel and BSIC reuse on the map
Possibility to find transmitters which are assigned a given :
• Channel (of a specified type – broadcast or not)
• BCCH-BSIC pairs
• HSNs
• MAIOs
• Any combination of any resource
Possibility to generate a report listing all the transmitters that use the searched channel (co-channel) and its adjacent channels
Possibility to generate a report listing all the transmitters that use the searched (BSIC-BCCH)
pair
Possibility to generate a report listing all the transmitters that use the searched (Channel-
HSN) pair
Way to use this tool
Create and calculate a coverage by transmitter with a colour display by transmitter
Open the Find on Map tool available in the toolbar
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Find On Map Tool (2/4)
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Find On Map Tool (2/4)
Channel Reuse on the Map
Select the “GSM Channel” option
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Colours given to transmitters
• Red: co-channel transmitters
• Orange: co-channel transmitters and different subcell
• Yellow: multi-adjacent channel (-1 and +1) transmitters
• Green: adjacent channel (-1) transmitters
• Blue: adjacent channel (+1) transmitters
• Grey + Thin Line Symbol: other transmitters
Search type
Search
options
Find On Map Tool (3/4)
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BSIC-BCCH Reuse on the Map
Select the “BSIC-BCCH Pair” option
Find On Map Tool (3/4)
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Colours given to transmitters
• Red : searched transmitters
• Grey : others
Search type
Search options
(BSIC given in value
or in NCC-BCC)
Find On Map Tool (4/4)
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Channel-HSN Reuse on the Map
Find On Map Tool (4/4)
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Colours given to transmitters
• Red : searched transmitters
• Grey : others
Search type
Search
options
Frequency Histograms
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Frequency Histograms
Display of the Frequency Distribution
Available by selecting frequency plan and channel distribution… in the transmitters folder
context menu
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Interference Predictions (1/5)
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Interference Predictions (1/5)
Interference Condition
Interference studied on a TRX type (or All)Calculation of C/I and comparison with upper and lower thresholds
• Subcell or user-defined C/I thresholds
Optional Interference Computations
• Consideration or not of the receiver noise N (or user-defined value)
• Consideration of C/I levels satisfied by at least one TRX or the worst one
• Possibility to evaluate interference level on a specific channel
• Separated study of the contribution of co and/or adjacent channels, external sources of interferences(e.g. UMTS network)
• Modelling of the DTX with a voice activity factor
• Consideration of the traffic load per subcell
• Detailed results
• NH : per TRX type
• BBH : per TRX type and MAL
• SFH : per TRX type and MAL-MAIO
Colouring depending on attributes
C/I level, Max C/I level, Min C/I level
Transmitter
Any transmitter attribute...
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Interference Predictions (2/5)
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Interference Predictions (2/5)
Coverage by C/I Level Prediction
Global analysis of the network quality
Filter the useful
signal
Filter C/I
values
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Interference
calculation options
Interference Predictions (3/5)
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Coverage by C/I Level Prediction
Interference Predictions (3/5)
Overlapping zones
with a lower quality
(low C/I)
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Interference Predictions (4/5)
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Interference Predictions (4/5)
Interfered Zones Prediction
Areas where a Rx is interfered
Interference
calculation options© Forsk 2012 Slide 72 of 79Confidential – Do not share without prior permission
Filter the useful
signal
Filter C/I
values
Threshold under which
interferences are
considered
Interference Predictions (5/5)
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Interference Predictions (5/5)
Interfered Zones Prediction
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Areas where the receiver is
interfered (where the C/I is lower
than the user-defined threshold)
on the HCS server areas
Point Interference Analysis (1/3)
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Point Interference Analysis (1/3)
Interference Window of Point Analysis Tool
Selection of potentially interfered transmitterIndoor reception or not (receiver located indoor)
Filter on interfered TRX type (or all)
Filter on interferers
• Possibility to consider any combination of co-channel, adjacent channel or external interferences (e.g.
UMTS network)
Possibility to consider or not the receiver noise N
Analysis
• NH : per TRX type
• BBH : per TRX type and MAL
• SFH : per TRX type and MAL-MAIO
Std deviation type (model or C/I) + Cell Edge Coverage Probability
Reduction factor on signal and interference levels represented by partly filled bars
• Interfered reception bar: reduction due to power offset
• Interferer reception bars: reduction due to power offset, adjacent channel protection level, fractional
load, mean power control
Display on the map of interferers and related contributions to total interference
• Differentiation between co-channel and adjacent channel interferers
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Point Interference Analysis (2/3)
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Confidential – Do not share without prior permission
Point Interference Analysis (2/3)
Interference Tab in Point Analysis Window
Display of co-
channel
interference
Signal level
(C) of the
potential
victim at thereceiver
Transmitters participating in
the noise determination
Resulting C/I or C/I+N value
Studied
transmitter,
subcell and
TRX
Received noise
(I) from
surrounding co-
and adjacent
channels at the
receiver
Interference area
based on C/I
conditions
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Display of
adjacent channel
interference
Interference
types
Point Interference Analysis (3/3)
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Confidential – Do not share without prior permission
Details Tab in Point Analysis Window
Point Interference Analysis (3/3)
Signal level and
interference level
for each received
transmitter on the
receiver location
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Interference area
based on C/I
conditions
Training Programme
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Training Programme
1. Requirements
2. Configuring the Atoll AFP model
3. Running the AFP
4. Analysing the new Frequency Plan
5. Process Summary
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Process Summary
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Process Summary
1. Fix Network Configuration (Antenna height, azimuth, power, ...)
2. Define Transmitters to be taken into account (Computation Zone, Activity...)
3. Define Frequency, BSIC & HSN Domains (Parameters tabGSM Network Settings)
4. Set Network Parameters dealing with AFP (Assign Domains, Required No. of TRXs...)
5. Calculate/Import Neighbour Plan
6. Calculate/Import Interference Matrix(ces)
7. Define AFP model settings (define the Cost calculation function)
8. Run the AFP allocation and commit results
9. Analyse the new Frequency Plan
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THANK YOU!
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