© ls telcom ag 2002 - itu

1

© LS telcom AG 2002

Session 5.8

Supporting Network Planning Tools III

byRoland Götz

Welcome !

2


Modern Radio Network Planning Tools

Geo Information System

Data Management

Graphical User Interface

Propagation Prediction

Interference Analysis

Network Processor

Data / Result Output

Radio Network Planning ToolInterference Analysis

3


Wantedfield strength F d

Coverage area

Locationof wanted TX

Noise

C/N

Noise level F N

Minimumfield strength F min

1. Criteria for coverage

Wanted Field Str. > Minimum Field Str.

NMNLK

min

Nd

FNCFF /+>


Interference by Noise

Minimum field strength (C/N):It is a minimum field strength level which is necessary to fulfil the signal quality for coverage.

4


Wantedfield strength F d

Coverage areawith one

interfering Tx

Noise

C/N

Interferingfield strength F i


Wanted Field Str. > Nuisance Field Str.

MLK

n

id

FAFF +>

Coverage areawith noise only

Protection ratio

Nuisance field F n Interference Analysis

Interference by one Transmitter

Nuisance field:Interference field strength at the reference point plus the protectionratio (C/I) required for the considered service.

5



Wanted Field Str. > Usable Field Str.

MLK

uF

M

j

nj

d FF ∑=

>1

F i1F i2

F d

Coverage areawith several

interfering Tx

Noise

C/N

Coverage areawith noise only

Protection ratioUsable field strength F u Interference Analysis

Interference by several Transmitter

Usable field:Summation of the nusiance fields of the interfering tansmitters according to acertain summations algorithm (maximum,simplified multiplication, ...)It is the fieldstrength value which is usable by a possible new site just to fulfill the condition of coverage (C/I>0) by the existing interferer situation.

6


In modern Planning Tools, the cumulation of the single interfering fields can be done in several different ways.

The various procedures differ in the way how simplifications are usedto minimize the calculation effort.

In the following a short overview is given for the procedures which are most often used in interference calculations.

Procedures of Summation for Interference Calculation


7


Most use is made of the power-sum method and the simplified multiplication method

Reference CCIR Report 945-2: Methods for the Assessment of Multiple Interference

Non-statistical methods:

� Maximum procedure � Power-sum method

Statistical methods:

� Integration method� Log-normal method� Multiplication method� Simplified multiplication method� Simplified Log-normal method � Trilinear Log-normal method


Summation Procedures

8


Allocation algorithm

Number of required carriersChannel constraints

Cell specific parameter Cell relationsFrequency spectrum

Network wide parameter

Channel allocation

Neighbour relationsChannel separation matrix

� LS Box algorithm� Simulated annealing algorithm

Interference Analysis – Special Applications

Interference AnalysisInterference Matrix

Interference AnalysisAutomissed Frequency / Channel Assignment

9


Frequency Scan

� This function is used to find out gaps in the frequency spectrum where new TV or FMtransmitters could be planned. At a desired transmitter site (transmitter coordinate) awanted transmitter calculation based on a frequency range given by the user is doneand the usable field strength calculated for each frequency point.

Interference Analysis – Special Applications


10


LivePlanning Tool Demonstration

11




Data Management




Network Processor


Radio Network Planning ToolNetwork Processor

12


The Network Processor

• produces network-wide results out of the single-cell-based results • allows to analyse the radio network• allows to simulate changes of the network parameter• allows to simulate changes of the network design• allows to optimise the radio network• allows to plan the future roll-out phases• produces statistics on the selected results

Each Service needs an own service-specific Network Processor

Network Processor

Network Processor

13


Network Processor

Coverage of Single Sectors

14


Principle of calculation: Combination of different results

BS1

BS2

BS1

BS2BS3

Result for BS 1Result for BS 1



Combined resultCombined result

BS3

Network Processor

Network Processor

15


Maximum Field Strength:For every pixel, this plot shows the signal level of the cell/transmitter producing the maximum single field strength.

-120 -128 -130

-120 -127 -129

-115 -118 -121

-95 -80 -75

-90 -75 -70

-85 -70 -65

-65 -80 -95

-65 -80 -95

-65 -75 -95

-65 -80 -75

-65 -75 -70

-65 -70 -65

Sector 1

Sector 2

Sector 3

Max. Field.

Maximum Field Strength

Network Processor

16


Network Processor

Maximum Field Strength

17


Maximum Field Strength (Network)

Network Processor

18


Maximum Server:The maximum server plot shows, for a certain pixel, the name of the transmitter featuring the maximum signal; its field strength must exceed the minimum field strength required for coverage, Emin equiv.

-120 -128 -130

-120 -127 -129

-115 -118 -121

-95 -80 -75

-90 -75 -70

-85 -70 -65

-65 -80 -95

-65 -80 -95

-65 -75 -95

S3 x S2

S3 S2 S2

S3 S2 S2

Sector 1

Sector 2

Sector 3

Max. Server

Pmin= -75dBm

Network Processor

Maximum Server

19


Network Processor

Maximum Server

20


Network Processor

Maximum Server (Network)

21


-120 -128 -130

-120 -127 -129

-115 -118 -121

-95 -80 -75

-90 -75 -70

-85 -70 -65

-65 -80 -95

-65 -80 -95

-65 -75 -95

S3 x S2

S3 x S2

S3 x S2

Sector 1

Sector 2

Sector 3

Best Server

Pmin= -75dBmC/Imin= 7 dB

Network ProcessorBest Server:The maximum server plot shows, for a certain pixel, the name of the transmitter featuring the maximum signal; its field strength must exceed the minimum field strength required for coverage, Emin equiv and the Minimum C/I

Best Server

22


Network Processor

Best Server

Maximum Server Best Server

Inte

rfere

nce

Interference

InterferenceInterference

23


Network Processor

Best Server (Network)

Maximum Server Best Server

24


C/I at Max. Server:C/I at sector with highest power at a certain positionParameters: Minimum Level (Pmin)

-120 -128 -130

-120 -127 -129

-115 -118 -121

-95 -80 -75

-90 -75 -70

-85 -70 -65

-65 -80 -95

-65 -80 -95

-65 -75 -95

30 x 20

25 5 25

20 5 30

Sector 1

Sector 2

Sector 3

C/I at Max. Server

Pmin= -75dBm

Network Processor

C/I at MaxServer

25


Network Processor

C/I at MaxServer

26


Network Processor

C/I at MaxServer (Network)

27


Network Processor

Network Processor Results

Many other service-specific results can be processed by apowerful Network Processor, like:

• Number of Max Sever• Number Best Server• Strongest Interferer• Level of Strongest Interferer• Coverage Probability• Coverage Reserve

• Power Difference• Assignment Probability• Handover Zone• Requeired Channels• Coding Sheme Area (GPRS)• SFN Level Gain• ...

28


indoor urban

indoor suburban

outdoor rural

outdoor urban

Region of your networkCurrent network coverage

Now, we want toimprove the coverage in this region.

Network Processor

Example: Coverage Optimisation GSM Network

29


Candidate Steffisburg ANetwork Processor


30


Candidate Steffisburg BNetwork Processor


31


Candidate Steffisburg CNetwork Processor


32


Direct comparison of the three alternative site positions

Selection of Candidate Steffisburg C

Network Processor


33


Previous coverage Improved coverageNetwork Processor


indoor urban

indoor suburban

outdoor rural

outdoor urban

34



35




Data Management




Network Processor


Radio Network Planning ToolData / Result Output

36


Planning Tool Database

ExportExport

ImportImport


Import and Export

•Import and Export of

Databases and Tables ( Sites, Antennas,…)Result FilesMeasurement Data

Should be possible in several formats (.txt, .xls, ASCII, .jpg, …)

37


� Import measurement data� Analogue� Digital� BER

� Evaluation of measurement data� Rohde&Schwarz,� Alcatel, Ericsson TEMS, generic ASCII

� Plotting of measurement data� Calibration

� Path loss fit� Calibration of extended OH model


Example: Measurement Data

38


� Application specific frame

� Legend

� Print in specific map scale

� Specify margins and borders

� Multiple printing

� Support various paper sizes

� Add site specific information

Print Process Preview


Printing of Maps and Result Plots

39



Printing of Database Lists

40



41



Network Planning Tools forWireless Communication Systems

Mobile Communication Fixed Communication Broadcast „Special“ Systems

� analog� GSM� 3G / UMTS� Trunking� TETRA� Land Mobile Systems

� Microwave (PtP)� Point to Multipoint (PMP)� Wireless Local Loop

� FM� TV� T-DAB� DVB-T

� Satellite� Air Traffic Control� Maritime Services

One fits All? for:

� basic coverage maps?

� interference calculations?

� network analysis?

42


SoftwareTools

EngineeringServices

TrainingConsultancy

Solutions for Spectrum Management, GSM900, GSM1800, Microwave Links, PMP, LMDS, Radio/TV Broadcast, DVB, DAB, Trunked Radio, TETRA, Paging, Satellite Services

Is there anything else we can do for you?

43


SPECTROCANSailesh Thaker [email protected]

1145 Hunt Club RoadOttawa, OntarioCanada K1V 0Y3Phone: (613) 526-1661Fax: (613) 526-5326

www.spectrocan.com

LS telcom AGRoland GötzMember of the [email protected]

Im Gewerbegebiet 31-35D- 77839 LichtenauGermanyPhone: +49 7227 9535 700Fax: +49 7227 9535 702

www.LStelcom.com

© ls telcom ag 2002 - itu

Documents