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How to use FAS recordings
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Prepared by: ing. Brenda Franco Luna
GSC Mxico
OPTIMIZE RADIO NETWORK USING OSS TOOLS
FAS FREQUENCY ALLOCATION SUPPORT
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The objective of this document is to provide guidelines for
the use of FAS (Frequency Allocation Support) application,
part of the RNO (Radio Network Optimization) in the OSS,
as helpful tool during optimizing network:
FAS Initiation
FAS Creation
FAS Recording
ICDM Adjustment
PIR Adjustment
FAS Report
introduction
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Fas and fox operation
The main purpose of FAS and FOX is to help the user to choose which
frequency range is more suitable for a GSM cell.
FAS and FOX measure the uplink interference and estimate the
downlink interference, for all set of frequencies selected by the user .
Uplink measurements are performed on all TRXs of the cells that are
included in the recording. A sample is collected approximately every 15
seconds in the selected frequency to start recording. The result of the
recording is collected by FAS and processed by FOX . Consists of three
values for each frequency for each cell , an average value , a percentage , and the number of samples .
The value in percent ( % ) describes the distribution of samples
collected.
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Fas and fox operation
The downlink measures are based on measurements made by the
mobile . According to the GSM specifications , the mobile measure each
frequency that is declared in the BA List which is a list of frequencies for
each cell transmitted . The six strongest BCCH in the BA -list are
reported to the BTS about twice per second. The report with the 6-cell is
called Measurement Report.
The Measurement Report of the 6 strongest cells include the following
information: signal strength and frequency (BCCH and BSIC) . The last
two are used to identify the cell that has been measured . When
programming a FAS is possible to modify the BA List with the
frequencies that are not initially included in the BA List, for that could be
measured as a dummy .
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Fas and fox operation
For each measurement report the signal strength of the reported cells
are compared with the signal strength of the serving cell , to check for
potential interference between cells. After this comparison , this
information is compiled into a matrix which describes which signal level
between one cell and another .
The matrix is called ICDM (Inter - Cell Dependency Matrix) , and it has 3
values for each ratio of cells , a value for frequency co -channel , one for adjacent frequencies and a value for the number measurement reports when the frequency was included in the active BA List. The ICDM is
independent of the frequency plan used .
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Fas and fox operation
The ICDM is combined with the current frequency plan. For each
frequency (both configured and non-configured) in each cell that was
included in the recording, the Downlink interference is calculated based
on estimates of use. This value is called PIT (Percentage Interfered
Traffic), and shows how big is the percentage of traffic that could be
interfered with if the frequency was used in a particular cell.
FAS can be used to:
Frequency Planning
Frequency Reuse
Network monitoring, to measure levels of interference in the network
The use of FOX will be specified in another document.
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FAS INITIATION
1. Select the RNO tool in the main OSS menu.
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FAS INITIATION
2. In the principal window is possible to:
- Manage Records
- Create Recordings
- Create/Manage the set of cells
- Create/Manage the set of frequencies
- Manage Reports
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FAS creation
3. Go to File New Recording FAS
As a recommendation, the period of recording should be at least during 3
hours where the busy hour is been included, to have a good statistic
information.
- Name the recording
- Select FAS
For ICDM creation: Click in Create New ICDM and specify how ICDM will
be created. Declare the value of Relative SS Threshold C/I, Relative SS
Threshold C/A value , BA List rotation interval and number fo dummy
frequencies for each interval.
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FAS creation
Downlink Settings (for ICDM creation): Click in Create New ICDM and
specify how ICDM will be created. Declare the value of Relative SS
Threshold C/I, Relative SS Threshold C/A value , BA List rotation
interval and number fo dummy frequencies for each interval.
Uplink Settings: Click Create FAS Results and specify the percentage of
mesurements will be recorded, and the frequency set.
4. Specify the time interval for recording.
Intervals may be two periods. The minimum size of the intervals is
defined by (periodIntLimit) parameter defined during installation of FAS.
This parameter by default is .15 minutes. When a recording is made FAS downlink, this function uses the BAR (active BA-list Recording) in the
BSC.
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FAS creation
If you try to schedule a recording with a very short time (10 minutes is a
very short period of BAR) might be that the recording does not run,
because when recording starts, some commands are sent to the BSC to
make the initial configuration before the start of the recording, this setting
takes a few minutes, could have not enough time to start setting before
recording.
5. Select the set of cells to be recorded.
6. Select the type of recording system (do a filter or select cells).
7. Select the frequency to be used only when a recording is set uplink
(you must select Create FAS Result).
8. Select Save or Save and Schedule recording.
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Icdm adjustment
When a new ICDM is created, could be select many options
from an existing ICDM or not, and the settings of both could
be used. If two are combined, the interference values are
calculate according to the number of samples taken in a cell.
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Pit adjustment
The adjustment of PIT are used to specify the traffic balance
that will be offset during the PIT estimation, and to
determinate when will be completed the estimation PIT
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Pit adjustment
The alternatives for the estimation of traffic are the following:
1. The traffic load is calculated using data from BAR for cells
that are included in the recording. For cells that are not
considered in the recording, STS is used to calculate the
traffic load. If not available the STS will be used the average
value of traffic.
2. If required to make a FAS / FOX to estimate the PIT in all
cells and for all frequencies in high load conditions in all
cells, then you have to click on the checkbox "Estimate PIT
Based on Full Traffic Load ".
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REPORT FAS
The report cell is opened when the user selects a cell
click Reports FAS Cell Report.
This can be used to analyze the level of interference for
different frequencies defined.
The report contains two parts, one for the configured
frequencies and another for the measured frequencies. A
user can easily see if the test frequency is better than the
currently stored in the cell. By default, the list of set
frequency is stored in descending order.
If the Notes column shows PIT Inc. this indicates that the
PIT is incomplete.
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FAS REPORT
Graphical View.
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QUESTIONS
For any question please contact me:
Eng. Brenda Franco
brenda.paola.franco@gmail.com
I hope you found it useful !!
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