Supporting Network Planning Tools III

Transcription

1 Welcome! Session 5.8 Supporting Network Planning Tools III by Roland Götz 1

2 Modern Radio Network Planning Tools Radio Network Planning Tool Interference Analysis Data / Result Output Interference Analysis Propagation Prediction Graphical User Interface Data Management Geo Information System 2

3 Interference by Noise Interference Analysis Wanted field strength F d Minimum field strength F min C/N Noise Noise level F N Minimum field strength (C/N): It is a minimum field strength level which is necessary to fulfil the signal quality for coverage. Location of wanted TX Coverage area 1. Criteria for coverage Wanted Field Str. > Minimum Field Str. d N F > FKNLNM + C / N F min 3

4 Interference by one Transmitter Wanted field strength F d Nuisance field F n Protection ratio Interference Analysis Interfering field strength F i C/N Noise Nuisance field: Interference field strength at the reference point plus the protection ratio (C/I) required for the considered service. Coverage area with noise only 2. Criteria for coverage Wanted Field Str. > Nuisance Field Str. Coverage area with one interfering Tx d i F > FKLM + A Fn 4

5 Interference by several Transmitter Usable field strength F u F d Protection ratio Interference Analysis C/N Noise F i 2 F i 1 Usable field: Summation of the nusiance fields of the interfering tansmitters according to a certain 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. Coverage area with several interfering Tx Coverage area with noise only 3. Criteria for coverage Wanted Field Str. > Usable Field Str. M F d > n F j j = 1 KLM u F 5

6 Procedures of Summation for Interference Calculation Interference Analysis 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 used to minimize the calculation effort. In the following a short overview is given for the procedures which are most often used in interference calculations. 6

7 Summation Procedures Non-statistical methods: Statistical methods: Interference Analysis Maximum procedure Integration method Power-sum method Log-normal method Multiplication method Simplified multiplication method Simplified Log-normal method Trilinear Log-normal method 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 7

8 Interference Analysis Special Applications Automissed Frequency / Channel Assignment Interference Analysis Network wide parameter Frequency spectrum Cell specific parameter Number of required carriers Channel constraints Cell relations Neighbour relations Channel separation matrix Interference Analysis Interference Matrix Allocation algorithm LS Box algorithm Simulated annealing algorithm Channel allocation 8

9 Interference Analysis Special Applications Frequency Scan Interference Analysis This function is used to find out gaps in the frequency spectrum where new TV or FM transmitters could be planned. At a desired transmitter site (transmitter coordinate) a wanted transmitter calculation based on a frequency range given by the user is done and the usable field strength calculated for each frequency point. 9

10 Live Planning Tool Demonstration 10

11 Modern Radio Network Planning Tools Radio Network Planning Tool Data / Result Output Interference Analysis Propagation Prediction Graphical User Interface Data Management Geo Information System 11

12 The 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 12

13 Coverage of Single Sectors 13

14 Principle of calculation: Combination of different results BS1 Result Result for for BS BS 1 1 BS2 Result Result for for BS BS 2 2 BS3 Result Result for for BS BS 3 3 BS3 BS1 BS2 Combined Combined result result 14

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

16 Maximum Field Strength 16

17 Maximum Field Strength (Network) 17

18 Maximum Server 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, E min equiv. Sector Max. Server Sector P min = -75dBm S3 x S2 S3 S2 S2 S3 S2 S2 Sector

19 Maximum Server 19

20 Maximum Server (Network) 20

21 Best Server Best 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, E min equiv and the Minimum C/I Sector Best Server Sector P min = -75dBm C/I min = 7 db S3 x S2 S3 x S2 S3 x S2 Sector

22 Best Server Maximum Server Best Server Interference Interference Interference Interference 22

23 Best Server (Network) Maximum Server Best Server 23

24 C/I at MaxServer C/I at Max. Server: C/I at sector with highest power at a certain position Parameters: Minimum Level (P min ) Sector C/I at Max. Server Sector P min = -75dBm 30 x Sector

25 C/I at MaxServer 25

26 C/I at MaxServer (Network) 26

27 Results Many other service-specific results can be processed by a powerful, 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... 27

28 Example: Coverage Optimisation GSM Network Region of your network Current network coverage indoor urban indoor suburban Now, we want to improve the coverage in this region. outdoor urban outdoor rural 28

29 Example: Coverage Optimisation GSM Network Candidate Steffisburg A 29

30 Example: Coverage Optimisation GSM Network Candidate Steffisburg B 30

31 Example: Coverage Optimisation GSM Network Candidate Steffisburg C 31

32 Example: Coverage Optimisation GSM Network Direct comparison of the three alternative site positions Selection of Candidate Steffisburg C 32

33 Example: Coverage Optimisation GSM Network Previous coverage Improved coverage indoor urban indoor suburban outdoor urban outdoor rural 33

34 Live Planning Tool Demonstration 34

35 Modern Radio Network Planning Tools Radio Network Planning Tool Data / Result Output Data / Result Output Interference Analysis Propagation Prediction Graphical User Interface Data Management Geo Information System 35

36 Import and Export Data / Result Output Import and Export of Databases and Tables ( Sites, Antennas, ) Result Files Measurement Data Should be possible in several formats (.txt,.xls, ASCII,.jpg, ) Planning Tool Database Export Export Import Import 36

37 Example: Measurement Data 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 Data / Result Output 37

38 Printing of Maps and Result Plots Data / Result Output Print Process Preview Application specific frame Legend Print in specific map scale Specify margins and borders Multiple printing Support various paper sizes Add site specific information 38

39 Printing of Database Lists Data / Result Output 39

40 Live Planning Tool Demonstration 40

41 Modern Radio Network Planning Tools One fits All? for: basic coverage maps? interference calculations? Network Planning Tools for Wireless Communication Systems network analysis? Mobile Communication Fixed Communication Broadcast Special Systems analog GSM 3G / UMTS Microwave (PtP) Point to Multipoint (PMP) Wireless Local Loop FM TV T-DAB Satellite Air Traffic Control Maritime Services Trunking DVB-T TETRA Land Mobile Systems 41

42 Is there anything else we can do for you? Software Tools Engineering Services Training Consultancy Solutions for Spectrum Management, GSM900, GSM1800, Microwave Links, PMP, LMDS, Radio/TV Broadcast, DVB, DAB, Trunked Radio, TETRA, Paging, Satellite Services 42

43 LS telcom AG Roland Götz Member of the Board SPECTROCAN Sailesh Thaker President Im Gewerbegebiet D Lichtenau Germany Phone: Fax: Hunt Club Road Ottawa, Ontario Canada K1V 0Y3 Phone: (613) Fax: (613)