03802_31_RNO

(1)

03813-LZU 108 3704 Uae Rev C Slide 1 (104)

Radio Network Optimization

Applications

FAS

FOX

NCS

NOX

MRR

RNO – Radio Network Optimization applications

FAS

NCS

MRR

NOX TET

NOX

FOX

(2)

Frequency Allocation Support (FAS)

Objectives

• Improve quality of the frequency plan • Find suitable frequencies for new

cells/TRXs

(3)

FAS

Faster frequency planning

Shorter time to market

Higher C/I rate

Less dropped calls Better speech quality Customer satisfaction

Less effort for frequency planning

Increased revenue Lower O&M cost

Work Flow using FAS

1s 3r 0 100 1s 3r East West North

4 different reports Presentation on map

Initiates recording

Collects data and sends it to OSS

OSS suggests suitable change

(4)

FAS is Operated from OSS

OSS initiates the BSC function Radio Interference Recording (RIR)

The activities in FAS can be divided into four parts: - The recording configuration

- The recording procedure - The recording evaluation

- Sending data to CNA with the FAS change order.

Recording Configuration

The recording configuration consists of:

• The cell set, defining in which cells to record. • One or more frequency sets specifying which

frequencies to measure.

• A percentile value that specifies which RXLEV value to report from the recorded interference distribution.

• The recording session defined by a time schedule.

• A yes/no indicator if intermediate results shall be reported after each recording period.

(5)

Recording Procedure

• The measurements are made with the same resolution and range as normal RXLEV measurements

• For each frequency a sample is taken once every 15 seconds.

• One sample represents the signal strength during one burst.

• Each frequency will be sampled on a randomly chosen (possible) channel.

• Samples will only be taken on the following logical channel combinations:

1TCH/F + FACCH/F + SACCH/TF 2TCH/H(0.1) + FACCH/H(0.1) +

SACCH/TH(0,1)

• Maximum four bursts on the same channel during one SACCH period (480ms) are used for FAS measurements, irrespective of whether the channel is idle or not.

• During the 15 second cycle, the first 10 seconds are used for measurements on idle channels only.

• If the measurements are not completed after that, busy channels will also be used the remaining 5 seconds. The measurements are not distributed uniformly in time, but performed as fast as possible.

Recording Evaluation

The results will contain:

• The number of samples per measured frequency • The median interference, in RXLEV, per measured

frequency

• The Xth percentile value (in RXLEV) of the interference distribution per measured frequency, where X is given in the recording configuration

If traffic load statistics are fetched, there will be two validity counters per cell:

(6)

Recording configuration Parameters

Parameter

name Defaultvalue Recommendedvalue Value range Unit

Percentile Value Start Date

90

-Start Date Only Hours Repeat 90 -1-100 -00.00 - 23.59 (Maximum four intervals) Start Date Only / Daily / Weekly / Every Two Weeks

YYMMDD per cent hh.mm Days All

Get Result After each Recording Period Result

-After each Recording Period / When the Recording is Finished

- Sun - Sat

-Cell Set - May include cell names and/ or BSC names

-Operator's Full Set

Frequencies Operator’s Full Set / Cell’s Configured Freqs. / Frequency Set

-Interaction with other functions

- MRR & NCS

Useful information

- Finding a new frequency - The cell set

- Troubleshooting of a cell - Statistics

(7)

Recording Capacity

Resource Capacity Description

Number of simultaneous recordings under one OSS 10/BSC Recordings are simultaneous if their recording Sessions overlap Number of simultaneous recordings in one BSC 10

Number of cells in one Cell Set 2000 Number of frequencies in one recording 150 Number of stored recording results per OSS 100 Number of frequencies in a Frequency Set 150 Number of Cell Sets that can be defined 100 Number of Frequency Sets that can be defined 100 Length of one recording 273

hours After 273 hours overflow will occur for certain counters

FAS, Enhancements

• Downlink measurements

Inter Cell Dependency Matrix, ICDM • Percentage Interfered Traffic, PIT • Cell Frequency Interference Report

(8)

FAS - Recording Activities

(9)

New Concepts

• ICDM - Inter Cell Dependency Matrix

– Interference matrix

– Shows how much one specific cell interferes other cells – Adjacent and co-channel interference

• PIT - Percentage Interfered Traffic

– Estimate of downlink interference – Calculated for all frequencies in all cells

(10)

FAS - ICDM Report

(11)

FAS - System Parameters (1/3)

(12)

FAS - System Parameters (3/3)

(13)

Frequency Optimization Expert (FOX)

Objectives

• Improve quality of the frequency plan • Find suitable frequencies for new

cells/TRXs

(14)

FOX

Faster frequency planning Shorter time to market

Higher C/I rate

Less effort for frequency planning

(15)

FOX can be run in Three Different Modes

• Recording Mode

Uplink and Downlink recordings, the result is presented to the user. This mode is called FAS.

• Recommendation Mode

FOX suggest a number of frequency reallocations, the suggestions must be accepted or discarded by the user. • Automatic Mode

The reallocations will be carried out without confirmation by the user.

(16)

Recording Configuration

A recording configuration consists of: • A cell set

• A frequency set • A time schedule

• A specification if the recording should be performed on UL/DL/BL

Recording Configuration

For the Uplink measurements:

• A percentile value that specifies which RXLEV to report.

For the Downlink measurements:

• A relative signal strength threshold for C/I. • A relative signal strength threshold for C/A.

• The maximum number of test frequencies that may be added to the active mode BA lists at one time.

• BA list change interval, i.e. how often the test frequencies should be changed in the active BA list.

(17)

Recording Procedure, Uplink

• The measurements are made with the same resolution and range as normal RXLEV measurements

• For each frequency a sample is taken once every 15 seconds.

• One sample represents the signal strength during one burst.

• Each frequency will be sampled on a randomly chosen (possible) channel.

• Samples will only be taken on the following logical channel combinations:

1TCH/F + FACCH/F + SACCH/TF 2TCH/H(0.1) + FACCH/H(0.1) +

SACCH/TH(0,1)

• Maximum four bursts on the same channel during one SACCH period (480ms) are used for FAS measurements, irrespective of whether the channel is idle or not.

• During the 15 second cycle, the first 10 seconds are used for measurements on idle channels only.

• If the measurements are not completed after that, busy channels will also be used the remaining 5 seconds. The measurements are not distributed uniformly in time, but performed as fast as possible.

Recording Procedure, Downlink

The Downlink recording result is produced by the BSC function BA-list recording (BAR)

A counter is incremented every time

SS f,BSIC > SSserv + Relative SS Threshold for C/I (1) Another counter is incremented every time

(18)

03813-LZU 108 3704 Uae Rev C Slide 35 (104) Serving Cell ARFCN/BSIC 50/41 Measurement Report ARFCN/BSIC rxlev - Serving Cell 60 - 50/41 54 Parameters

Relative SS Threshold for C/I = -9 Relative SS Threshold for C/A = 3 Cell A

Cell B “C” “I”

Check equation (1) and (2):

(1): SSBSIC= 54 > SSserv+ Relative SS Threshold for C/I = 60 + (-9) = 51 =>

true, increment C/I counter

(2): SSBSIC= 54 > SSserv+ Relative SS Threshold for C/A = 60 + 3 = 63 =>

not true, do not increment C/A counter

Probable Cell Name

When OSS receives the recorded ARFCN/BSIC combinations FOX tries to interpret them to probable cell names.

The area for which FOX searches for Probable Cell names is set by the parameter Bounding Box

(19)

Inter Cell Dependency Matrix (ICDM)

The result of the Downlink Recording is logically two ICDMs.

Interfering Cells

Cell A Cell B Cell C

Cell A Cell B . . . . Cell X

Cell Set Element (C, B)

contains three values: - Ne/Ntot

- Na/Ntot - Ntot

Percentage Interfered Traffic (PIT)

For a given frequency f in a given cell A, PIT is estimated by adding: a) The sum of all (non-zero) ICDM-C (A,X) matrix elements, for all cells X where f is used, where X is a cell within the same OSS as A and for which the number of counts indication is equal to or larger than Minimum number of DL samples.

b) Plus the sum of all (non-zero) ICDM-A (A,X) matrix elements, multiplied with a factor, Adjacent Frequency Interference Contribution, for all cells X where an adjacent frequency to f is used, where X is a cell within the same OSS as A and for which the number of counts indication

(20)

Percentage Interfered Traffic, Compensated

The ICDM element should be reduced to cater for:

a) Lower traffic load in the interfering cells. b) DTX (downlink) usage in the interfering cells. c) BTS Power Control usage in the interfering cells.

d) Frequency load, when synthesizer frequency hopping is used the interfering cells.

Percentage of Interfered Traffic

Cell A

f1 Cell Bf1

Cell C

ICDM(C,A) = 5% ICDM(C,B) = 7%

(21)

In FAS recording mode

•FAS Overview Report •FAS Cell Report •FAS Cell Report Chart

•FAS Overview Comparison Report •FAS Cell Comparison Report •FAS UL Data Validity Report •FAS Interference Report •FAS ICDM Probable Interfering Cell Report

•FAS ICDM Report

•FAS ICDM Validity Report •FAS Change Order

In FOX Recommendation / Automatic mode

• FOX Change Order Evaluation • FOX Change Order

Recommendation • FOX Reallocation Log

Recording Evaluation

Reallocation Search

• Find tentative Reallocation Suggestions

• Reduce the set of tentative Reallocation Suggestions by removing those for which the uplink interference estimate for the candidate frequency, or the reallocating frequency, is not based on enough samples.

• Reduce the set of tentative Reallocation Suggestions by removing those for which the candidate frequency does not belong to the correct Frequency Set.

(22)

Reallocation Search (2)

• Reduce the set of tentative Reallocation Suggestions by removing those for which the measured uplink interference is affected by halted cells.

• Prioritize the remaining Reallocation Suggestions. • Compile the Recommendation List.

Find Tentative Reallocation suggestions

• Improve Own Uplink

• Improve Own Downlink • Change Interferer

(23)

RNO - What does FOX do?

• Gives recommendation on suitable frequency reallocations (optimization)

• Can automatically update the network (implementation)

FOX

RNO - Relation between FOX and other appl.

Cellular network FAS CNA Data Collection Recording Definition FAS Reports FAS Result Export Change Order FOX Algorithm FOX Result FOX Reports

(24)

RNO - FOX Overview

Suggested frequency changes Result Uplink + Downlink FOX Reallocation search Implementation Measurements in live network Automatic mode Recommendation mode

(25)

New Recording

Frequencies Type When ICDM

(26)

FOX - Change Order Evaluation

Table 1 Recording configuration parameters

Parameter name Default value Recommended value Value range Unit BA List Change

Interval (minutes) 10 - 10 to 1440 (24h) Minutes

No. of Test Freqs. to

Add at Each Interval 5 - 1 to 32

-Start Date - - - YYMMDD

Repeat Start Date

Only

- Start Date Only / Daily / Weekly / Every Two Weeks

-Times - - -

-Days All - Mon-Sun

-Hours - - 00.00-23.59 (Maximum

four intervals)

hh.mm

Type - - FOX Recommendation

/ FOX Automatic

-Evaluation Period - - After Each Day / Each

recorded Week / When Recording Ready

-Cell Set - - Cell names

-Frequencies user’s Full Set - user’s Full Set / Cell’s Configured Freqs. / Frequency Set

-Percentile 90 - 1 to 100 percent

Relative SS

Threshold for C/I -9 - - dB

Relative SS

Threshold for C/A 3 - - dB

Co-Freq. Interference contributors 1st and 2nd Order Neighbours - 1st Order Neighbours, 1st_{and 2}nd_Order Neighbours -Adjacent-Freq. Interference contributors 1st_Order Neighbours - None, 1 st_Order Neighbours

(27)

-03813-LZU 108 3704 Uae Rev C Slide 53 (104) Table 2 System parameters

Parameter name Default

value Recommended value Value range Unit

Spacing Matrix - - 0, 1, 2, Comb-space -Adjacent Frequency

Interference Contribution 100 - 0 to 100 percent Base Station Power Control

Reduction 100 - 0 to 100 percent

DTX Interference Reduction 50 - 0 to 100 percent Minimum number of UL

samples

500 - - samples

Minimum number of DL

samples 10000 - - samples

Min. Considered ICDM

element 0.1 - - percent

Bounding Box 30 - - km

Path loss Per Dist Decade 31 - - dB/decade Sector Antenna Gain Offset -5 - - dB Sector Antenna Gain

Amplitude 14 - - dB

Table 3 Reallocation Search parameters

Parameter name Default value

Recommended value

Value range Unit

Reallocation Set - - Cell names that are

included in the Cell Set -Maximum Accepted DL

PIT 5.0 - 0 to 100 percent

Minimum Required DL PIT Improvement 2.0 - 0 to 100 percent Maximum Accepted DL PIT Impairment 1.0 - 0 to 100 percent Minimum Required UL Interference Improvement 5.0 - - dB Maximum Accepted UL Interference Impairment 2.0 - - dB Minimum Required UL Interference Improvement when DL PIT Estimate is Incomplete

7.0 - - dB

Exclude BCCH Frequencies from the Reallocation Search

(28)

-03813-LZU 108 3704 Uae Rev C Slide 55 (104)

Neighboring Cell Support (NCS).

BA-list

Background

• Handover decisions are based to measurements on

neighboring cells, performed by the Mobile Station (MS) in active mode.

• A list of frequencies, the active mode BCCH Allocation (BA) list, is throughout a call repeatedly sent to the MSs on the Slow Associated Control Channel (SACCH).

• The MS measures signal strength and tries to decode the Base Station Identity Code (BSIC) on each frequency in the list.

• The six strongest of the frequencies for which the BSIC was decoded successfully are reported back to the system in a Measurement Report. • Such a report is sent on the SACCH (uplink) once every 480 ms.

(29)

Why NCS?

• Gives the operator the support needed for optimizing cell relation data in the network in minim effort.

– Needs for improvements can easily be identified – Decision support is given

– Cells can be removed/added from/to the BA-list easily – Cell relation data is optimized

NCS Benefits

Less effort to determine optimal cell relation data

(30)

Work Flow using NCS

• NCS is operated via OSS • Analyzes measurement reports

and handover statistics • Can add BCCHs to BA list

Neighboring Cell Support is operated from OSS. OSS initiates the Base Station Controller (BSC) function Active BA List Recording according to the user's settings.

The activities in Neighboring Cell Support can be divided into four parts:

1 the recording configuration, when the user schedules a

recording,

2 the recording procedure, when the system carries out the

activities specified in the recording configuration,

3 the recording evaluation, when the user requests a

presentation of recording data.

4 the creation of change orders, when the user exports a change

(31)

Recording Configuration

The recording configuration consists of:

• A cell set, defining where to record. A cell set may contain cells from more than one BSC.

• A list of test frequencies, called a frequency set, specifying what frequencies to add to the active mode BA lists.

• A time schedule that defines when recordings should be made. • A relative signal strength threshold.

• An absolute signal strength threshold. • The length of recording segments

• The maximum number of test frequencies that may be added to the active mode BA lists at one time.

Recording Configuration

The relative signal strength threshold is related to a counter that is incremented every time SSf,BSIC > SSserv + Θrel is fulfilled.

The absolute signal strength threshold is related to a counter that during the recording is incremented every time SSf,BSIC > Θabs is

(32)

Recording Procedure

During a recording, some general data is logged:

• total recording time

• total number of Measurement Reports received • average signal strength of serving cell (downlink)

Recording Procedure

The following data is recorded for each combination of frequency and BSIC:

• number of times the combination occurred in Measurement Reports

• average signal strength of all occurrences

• number of times it was reported above the signal strength of serving cell plus the relative signal strength threshold • number of times it was reported above the absolute threshold • number of times it was the only one in the Measurement Report • number of times it was reported as the strongest, second

strongest, etc. up to sixth strongest frequency/BSIC

(33)

• Total recording time with this frequency in the active mode BA list (This may differ from total recording time, because of the segmentation of the recording). • Total number of Measurement Reports with this

frequency in the active mode BA list.

In addition, the following is recorded for each

test frequency:

Recording Evaluation

Overview report

• Highest percentage of undefined • Lowest percentage of defined

Cell report

• Cell names

• # reports above relative threshold • # of reports as strongest

• Average SS when strongest

Detailed cell report

• All data from recording

Cell report chart

• Displays a group of the occurence of the ordinary BA list frequencies (or test frequencies) for a selected

(34)

Recording Configuration Parameters

Parameter name

Default value

Recommended

value Value range Unit

3 -75 Relative Signal Strength Absolute Signal Strength --63 to 63 -110 to -48 dB dBm

-Call Set - May include cell names and/

or BSC names

-Frequencies All BCCH

Frequencies / Each cell using its BA-list freq. + Neighbors Neighbors freq. / BA-list freq. + free Selection -5 Number of test freq. to add - 1 to 32 -10 How often BA list shall change

- 10 to 1440 (24 h) minutes Start Date -Daily Hours Repeat -00.00 - 23.59 (Maximum four intervals) Start Date Only / Daily / Weekly / Every Two Weeks

YYMMDD hh.mm

Days All - Sun - Sat

-All BCCH frequencies

Recording Capacity

Resource Capacity Description

Number of simultaneous recordings under one OSS

64 /BSC -Number of simultaneous recordings in one BSC 64 -Number of cells in one Cell Set 2000

-Number of frequencies in one recording No limit It is possible to include all ARFCNs in the system

Number of stored results 100 -Number of Cell Sets that can be defined 100 -Number of Frequency Sets that can be defined 100

-Duration of one recording 31 days The time schedule in one recording configuration may be 31 days long. The recording in the BSC can not be longer than one day, which means that new BSC recordings are started each day.

(35)

NCS Detailed Cell Report (example) (R7)

(36)

NOX - What can it be used for

To find neighboring cell relations to add and remove (Optimization)

To see how good the test frequency is (Supervision)

To automatically update the network (Implementation)

NOX - Function modes

• Recording level

Present result in reports (NCS)

• Recommendation level

Give recommendations on neighboring cell relations based on the recording result

• Automatic level

Based on the recordings, NOX will decide about neighbor cell relations and implement the changes automatic

(37)

Algorithm

• Active BA list recordings • Handover statistics

• Network configuration data • Control parameters

• Inputs specified by the user

Active BA list recordings

• The minimum required measurement reports for a cell in order for it to be regarded as a candidate for evaluation of additions, MinCountsDL.

• The total number of measurement reports received in a cell when a certain frequency was included in the BA list, MRtot.

• The number of measurement reports received when a certain frequency/BSIC combination was reported stronger

(38)

Statistics (1)

• The number of handover attempts from one cell to another, HOVERCNT.

• The number of successful handovers, HOVERSUC . • The number of reversed handovers. This indicates the

number of times the MS has been put back on the old channel during the recording period, HORTTOCH.

Statistics (2)

• The number of dropped TCH/fullrate connections, TFNDROP.

• The number of dropped TCH/halfrate connections, THNDROP.

(39)

Network Configuration Data

• Current contents of the active mode BA list and neighboring cell relations.

• The BSIC of each cell.

• The system type of cells within the network (GSM 900, GSM 1800 or GSM 1900).

• The cell type, either omni cell or sector cell. • The geographical location of the base station. • The output power of the base station.

Control Parameters

• Thresholds in the algorithm

• Limitations of the maximum number of frequencies in the BA list.

(40)

Inputs Specified by the user

• The user can specify whether removals, additions or both shall be allowed.

• The barring matrix. The user can specify which cell relations that are allowed to be modified in the network.

Algorithm Output

• Change Order Recommendation • Change Order Evaluation

(41)

Recording Mode

• The recording configuration, when the user schedules a recording.

• The recording procedure, when the system carries out the activities specified in the recording configuration.

• The recording evaluation, when the user requests a presentation of recording data.

• The creation of change orders, when the user exports a change order to a planned area in CNA.

(42)

NOX, Reallocation Log

Main Controlling Parameters

Parameter name Installation default Unit stsCollectionPeriod 15 days pathLossPerDistDecade 31 dB/decade sectorAntennaGainOffset -5 dB sectorAntennaGainAmplitude 14 dB networkUpdateTime 00:45 hh:mm

(43)

Recording Configuration Parameters

Parameter name Default Value Value Range Unit

Relative Signal Strength 3 -63 to 63 dB Absolute Signal Strength -75 -110 to –48 dBm Number of test freq. to add 5 1 to 32 -Change intervall of BA list 10 10 to 1440 minutes Start date - - yymmdd Hours - 00.00 – 23.59 hh.m Repeat Start date only Start Date

Only/Daily/Weekly/ Every Two weeks

-Days All Mon-Sun Cell Set - May include cell

names and/or BSC names Frequencies All BCCH frequencies All BCCH frequencies/Each Cell using its BA-list freq./ BA-BA-list freq + Neighbours Neighbours freq./BA-list frequency+ free Selection

Algorithm Parameters

Parameter Name Default Value Value Range

AddShort 500 0-100.000 per 100.000 AddLong 1000 0-100.000 per 100.000 AddShortDB 100 0-100.000 per 100.000 AddLongDB 200 0-100.000 per 100.000 RmvShort 10 0-100.000 per 100.000 RmvLong 100 0-100.000 per 100.000 RmvShortDB 5 0-100.000 per 100.000 RmvLongDB 50 0-100.000 per 100.000 Length 15 0-32 LengthDB 5 0-32 MaxBAList 32 32 MinCoutsDL 10000 0-100.000 per 100.000

(44)

Measurement Result Recording (MRR)

Purpose of MRR

• Supervision of the network performance • Troubleshooting of the network

• Comparison of the network performance before and after a change is made to the network

(45)

The measured radio characteristics are:

• Signal strength in both Uplink (UL) and Downlink (DL). • Signal Quality in both UL and DL.

• Timing Advance (TA).

• Power level used by the MS and Power reduction of the BTS.

• UL and DL Pathloss.

Recordings can be controlled in the BSC

or in OSS.

• In BSC MRR is operated directly by BSC commands. • In OSS MRR is an application in the Radio Network

Optimization (RNO) framework. Cell names and cell data are fetched from Cellular Network Administration (CNA)

(46)

MRR collects data from Measurement Results

• UL RxLev (0,...,63 GSM or -110,...,-47dBm). • DL RxLev (0,...,63 GSM or -110,...,-47dBm). • UL RxQual (0,...,7 GSM). • DL RxQual (0,...,7 GSM). • TA (0,...,219 GSM). • MS Power level (0,...,39 dBm). • BTS Power reduction (0,-2,...,-28,-30 dB).

MRR separately calculates and accumulates

counters for two other radio characteristics

• UL Pathloss in dB (30,...,153 dB)

(47)

MRR Reports

• Overview Report • Top Ten Chart • Overview Histogram • Cell Histogram • Comparison Report • Comparison Chart

• Cell Comparison Histograms • Trend Report

GPRS Impact

The introduction of GPRS in a network has no effect

on MRR. MRR records Measurement Results

received from conventional circuit switched MS

connections only.

(48)

Flow start Creating a cell set Performing an MRR

recording Analyzing the result

using MRR reports Changing something in

the Network (not performed by MRR) Performing an MRR

recording Verifying that the change increased the

quality

Map Overview Report

Top Ten Chart Overview Histogram

Cell Histogram

Map Comparison Report

Comparison Chart Cell Comp. Histogram

Perform regular recordings for a part of the network that includes up to 200 cells, and run the

recordings during busy hour everyday for a few days. Get the results after the recording is done.

Open an MRR Overview Histogram to get a general overview of speech quality.

Open an MRR Overview Report to show the UL

and DL quality in the cells. Open an MRR Top Ten Chart to show the 10 best

or 10 worst cells. Open an MRR Cell Histogram for cells that

General

(49)

Value ranges and default values

Parameter name

Default value Value Range Unit

Start date - - yymmdd

Repeat Start day only Start Date Only / Daily / Weekly /

Every Two Weeks

-Record Times - 1 to 9999

-Days - Free selection Mon-Sun /

Weekends / Working days

-Hours - 00.00-23.59 (Maximum four

intervals)

hh.mm

Cell Set - May include cell names and /or

BSC names -Getting Results When all periods are done

When all periods are done / After each period, Save results separately / After each period, Accumulate Results

-Recording Thresholds

None None / Rxqual UL 0-7 / Rxqual

DL 0-7 / Rxlev UL – 110 to – 47 / Rxlev DL –110 to –47 / TA / Type 1 / Type 2 / Type 3 GSM and / or dBm

Recording Capacity

Resource Capacity

Number of simultaneous Recordings under one OSS 10/BSC

Number of simultaneous Recording Individuals in one BSC

10

Number of cells per Recording Individual 512

Number of Recording Individuals active in 1 cell 1

Number of cells in one cell set 2000

Number of cell sets defined 100

Number of cells per Recording Activity 2000

Number of cell sets per Recording Activity 1

Number of stored results 100 at least

Number of Recording Periods per day 4

(50)

MRR - Data correlation

• Two recording thresholds - to achieve correlation of radio characteristics

• Examples:

– RxLev_DL > -85 dBm and RxQual_DL > 5

– Find at which distance from the BTS interference occurs – Detection of too high BS power

– Poor coverage (shadowing)

MRR - Correlation (1/4)

(51)

MRR - Correlation (2/4)

UL, DL, UL/DL

<=, >=, =

(52)

MRR - Correlation (4/4)

Table 4 Recording capacity

Resource Capacity Description

Number of simultaneous Recordings under

one OSS 10/BSC Recordings are simultaneous if theirRecording Sessions overlap Number of simultaneous Recordings in

one BSC 10

Number of cells in one Cell Set 2000 Number of frequencies in one Recording 150 Number of stored Recording results per

OSS 100

Number of frequencies in one Cell Set 150 Number of Cell Sets that can be defined 100 Number of Frequency Sets that can be defined

100

Length of one Recording 273 hours After 273 hours overflow may occur for certain counters

Length of an Evaluation Period 31 days Number of rows in an ICDM 2000 Number of elements in a given row of an

ICDM 2000

Number of stored ICDM 5 Number of possible elements in a Barring

Matrix 1000

Number of simultaneous FAS/FOX