Drive Test Nemo

40,658 views

Published on

My slide presentation - trainer at Expert Coaching Clinic

Published in: Technology, Business
32 Comments
177 Likes
Statistics
Notes
No Downloads
Views
Total views
40,658
On SlideShare
0
From Embeds
0
Number of Embeds
324
Actions
Shares
0
Downloads
0
Comments
32
Likes
177
Embeds 0
No embeds

No notes for slide

Drive Test Nemo

  1. 1. Nemo Drive Test on 2G/3G Networks Toha Ardi Nugraha Trainer at Expert Coaching Clinic
  2. 2. Network Optimization Process
  3. 3. Reason of Drive Test?1. Network Performance Monitoring2. Maintenance3. Benchmarking4. Customer Complains
  4. 4. • Module 1 : Overview 3G System (1 hour)• Module 2 : Drive Test Concept (1,5 hour)• Module 3 : Drive Test on Field (2,5 hour)• Module 4 : Reporting (2 hour)• Module 5 : Analysis (2 hour)
  5. 5. Module 1OVERVIEW 3G SYSTEM
  6. 6. Data Transmission
  7. 7. GSM & UMTS Evolution
  8. 8. 3G/UMTS Architectures (Migration)
  9. 9. Specification of GSM• Frequency band : Uplink 890 – 915 Mhz Downlink 935 – 960 Mhz• Duplex spacing : 45 Mhz• Carrier spacing : 200 khz• Modulation : GMSK• Access method : FDMA / TDMA
  10. 10. GSM network Architecture (cont’d)• 3 Subsystem in GSM network - BSS (Base Station Subsystem) - NSS (Network and Switching Subsystem) - OSS/OMC (Operating and Support system or Operating and Maintenance Centre)
  11. 11. GSM network Architecture (cont’d)BSS (Base Station SubSystem)• BTS (Base Transceiver Station) - Radio equipment - To transmit and Receive signal to MS - Defined a Cell coverage depend on the power transmit• BSC (Base Station Controller) - RRM for several BTS - Handover management• TRAU - Rate adaption
  12. 12. GSM network Architecture (cont’d)NSS (Network and Switching Sub System)• MSC (Mobile Switching Centre)• HLR (Home Location Register)• VLR (Visitor Location Register)• AuC (Authentication Center)
  13. 13. GSM network Architecture (cont’d)Operation and Support System• Control and Monitor the Network - NMC (Network Management Centre) - Some OMC are controlled by NMC - OMC (Operation and Maintenance Centre)
  14. 14. GSM Frequency Bands Frequency Band GSM type Uplink (UL) Downlink (DL)GSM 900 890-915 Mhz 935-960 MhzGSM 1800 (DCS 1800) 1710-1785 Mhz 1805-1880 MhzGSM 1900 (PCS 1900) 1850-1910 Mhz 1930-1990 Mhz
  15. 15. GSM Channelization• Physical Channel – 200 Khz (Frequency Carrier) consist of 8 TS• Logical Channel – Control Channel – Traffic Channel Control Traffic Channel Channel
  16. 16. GSM channelization (Cont’d) Logical channel Chontrol Traffic Channel Channel Common DedicatedBroadcast Control Control Full Rate Half rate channel Channel Channel
  17. 17. 3G/UMTS Concept• WCDMA Concept• UMTS Architecture• Channelization• Handover
  18. 18. WCDMA - Wideband CDMA• Radio access technology for one of the UMTS access modes (UTRA FDD) using 5 MHz duplex channels. – Frame length is of 10 msec, Chip rate is 3.84 Mcps – All users share the same frequency and time domain – Users separated by the codes
  19. 19. UMTS Radio Frequency Ranges• FDD (Frequency Division Duplex)• TDD (Time Division Duplex)
  20. 20. Channelization in UMTS• Logical Channel between RLC and MAC – Specific for information types – What type of data to be transferred• Transport channel between MAC and PHY – Specific for “how to transfer information?” (quality guarantee) – How and with which type of characteristic the data is transferred by the Physical Layer• Physical Channel – Exact Physical characteristics of the radio channel
  21. 21. WCDMA Channel (Cont.s)• Spreading means increasing the signal bandwidth• Spreading includes two operations – Channelization (increases signal bandwidth) • Orthogonal Spreading – Scrambling (does not affect the signal bandwidth) • Use pseudo-noise codes
  22. 22. Handover Concept BSC Handover Req Handover Acknowledge Request Handover Req Handover Req Acknowledge Acknowledge Handover Handover command Complete Handover Request Posisi 2Site B Posisi 1 Site A Posisi 3
  23. 23. Handover: Types (2G)• Intracell handover – MS moves from one sector to another sector within same cell• IntraBSC handover – MS moves from cell to another cell within same BSC• IntraMSC handover – MS moves from cell to another cell from different BSC within same MSC• InterMSC handover – MS moves from cell to another cell from different BSC and different MSC
  24. 24. Handover: Types (3G)• Intra-System handovers – Intra-frequency handovers • Soft, Softer – Inter-frequency handovers • Hard• Inter-System handovers – Handover between WCDMA <> GSM (Hard) – Handover between WCDMA/FDD <> TDD (Hard)
  25. 25. Pilots SetThe handset considers pilots in sets – Active : pilot of sector actually in use – Candidate : pilots mobile requested, but not yet set up & transmitting by system – Neighbors: pilots told t mobile by system, as nearby sectors to check – Remaining: any pilots used by system but not already in the other sets
  26. 26. Soft Handover Algorithm T T TMeasurement Quantity CPICH 1 As_Th + As_Th_Hyst AS_Th – AS_Th_Hyst As_Rep_Hyst CPICH 2 CPICH 3 Time Event 1A Event 1C  Event 1B  Cell 1 Connected  Add Cell 2 Replace Cell 1 with Cell 3 Remove Cell 3
  27. 27. Module 2DRIVE TEST CONCEPT
  28. 28. Network Environment• UMTS Drive Test is testing and measuring performance of 3G/UMTS network.• Tools : 1. Software Nemo Outdoor 2. PC laptop 3. GPS 4. Scanner
  29. 29. Reason of Drive Test?• Network Performance Monitoring• Maintenance• Benchmarking• Customer Complains
  30. 30. Continuous Drive Test• Drive Test (outdoor) – GPS• Walk Test (indoor) – Pin point/way point
  31. 31. Analyze Data Collection• Analyze data that was collected before (from Log files)• To know some problems in current area
  32. 32. Reporting• To Answer Analyze Data Collection (Objective Answer)• Optimization Consideration• Recommendation
  33. 33. Parameters DT GSM1. Rx Level2. Rx Qual3. SQI4. Cell Id, BSIC5. TA (Timing Advance)6. ARFCN, etc
  34. 34. Parameters DT UMTS• UARFCN (UMTS Absolute Radio Frequency Channel Number)• RSCP (Receive Signal Code Power)• RSSI (Receive Signal Strength Indicator)• SC (Scrambling Code)• Ec/No• UE TxPower (dBm)• Throughput• BER, etc
  35. 35. Open Device Manager• Step 1: Start >“Settings”> “Control Panel” > “System”Or “My Computer” > “Manage” > “Device Manager” • Step 2: Choose “Hardware” Tab in System Properties > Click “Device Manager”.
  36. 36. Open Device Manager• Step 3 :• Look port to conect hardware (Modem)• Scanner/GPS & Check COM Ports
  37. 37. Connect UE & Check COM Ports• Double click the “3G Modem” to check Trace port number > Check under “Modem” Tab.• For UE Modem: – In device manager view:
  38. 38. Start Nemo Outdoor 5.07 and Load Workspace• Make sure the Nemo dongle is connected to the laptop.• Launch Nemo Outdoor 5.07.• Load the desired workspace.• Workspace should contains adequate information for the user to monitor.• Different workspace should be created for different setup configuration.• Nemo workspace are stored proper folder for easy access, eg. C:Nemo ToolsNemo OutdoorWorkspaces
  39. 39. Running ProgramStart >Program Files > Nemo Tools > Nemo Outdoor 5• Workspace• Details• Device Configuration• Load a measurement
  40. 40. User Interface Nemo Outdoor 5 Device graph Worksheet
  41. 41. Load Workspace• Step 3: Browse to Nemo Workspace Folder -> Select “workspace” > Click “Open”.
  42. 42. Create Workspace• Parameter
  43. 43. Add Devices• Step 1: Go to “Measurement” workspace > “Add New Device”.• Step 2: Click the “Configuration” part > “Trace port” and “Modem port”
  44. 44. Nemo Interface• Map Interface – Open map (.tab)• Nemo logfiles and other files are stored proper folder for easy access, eg. C:Nemo ToolsResults (.nmf)
  45. 45. Module 3DRIVE TEST ON FIELD (OUTDOOR)
  46. 46. Module 4REPORTING
  47. 47. Map Info• Exporting from Nemo Outdoor – Select Parameters• Reporting KPI with Map Info• Layer Control – Symbol• Create Thematic Map• Define Network Performance• Open Table
  48. 48. Export to Map Info
  49. 49. Select Parameters
  50. 50. Report KPI With Mapinfo• KPI (Key Performance Indicator) : key to detemaint Network performance. like as , RSCP, Ec/No, etc• Mapinfo is Software for loading and mapping geogharphic analysis • File > open file (chose file extention .tab) • Ex : bandung.tap • Used Layer control
  51. 51. Open Log files • Example file (.tab)
  52. 52. Layer Control• Command: – View – Edit
  53. 53. Create Symbol
  54. 54. Create Thematic Map
  55. 55. Create Thematic Map (Cont.s)
  56. 56. Create Thematic Map (Cont.s)
  57. 57. Reporting with Map Info
  58. 58. Open Table
  59. 59. Module 4ANALYSIS (TUNING THE NETWORK)
  60. 60. UMTS Optimization• 3 Mayor Steps in Optimizing Network• UMTS performance indicator• Problem Signature• Tuning network – Specific Neighbor list – Managing excessive soft handoff
  61. 61. 3 Mayor Steps in Optimizing Network• RF optimization is the process of measuring,• analyzing, and tuning and existing network to meet network performance criteria• It usually occurs after the network planning is completed• It can be performed frequently to respond: – Changes or growth in the network – Customer complaints such as coverage, dropped call etc. – The need to improve capacity.
  62. 62. UMTS Performance IndicatorKPI Target : – RSCP (good > -85 dBm) – Ec/No ( > -8 dB) – BER (98%) – Analyze Pilot Pollution Area – Drop Call Rate (DCR) – HSR (Handover Success Rate) – Call Setup Success Rate (CSSR)
  63. 63. Problem Signature• Missing Neighbor or No Neighbors defined for Site. (Database)• Poor Coverage Area.• Pilot Pollution Area
  64. 64. Poor Coverage Area• Test mobile measurements• Antenna configuration check• Verification of RF network design• Propagation model verification• Link budget analysis
  65. 65. Improving coverage– Cell spliting, Sectorisation • Difficult , Expensive • Primarily used for capacity enhancement– Overlaid cell structure • Micro- and picocells • Cellular repeaters RNC Node B Node B Node B Node B
  66. 66. Pilot Pollution• Active set UE > 3 and in range 5 dB or approximately 3 dB from the biggest active set.• Reduce system performance,
  67. 67. Antenna Fine Tuning• Horizontal plane – Possible coverage weakness between sector – Interference reduction – Traffic load distribution• Vertical Plane – Interference reduction – Possible coverage weakness in the short to medium distance range – Traffic load distribution
  68. 68. Tuning the NetworkSolution (Antenna Adjustments)Include : – Down tilting – Antenna Height – Azimuth – Type of antennaReason of Down tilting: 1 Reduce interference 2 Optimizing cell
  69. 69. Antenna Configuration• General points to check – antenna type, e.g. • omni • directional 60, 90 or 120 degrees • electrical downtilt – antenna azimuth angle (for directional antenna) • coverage targets – antenna tilt angle • electrical + mechanical – diversity & isolation • e.g. space diversity, • polarisation diversity
  70. 70. Type Antenna Down tilt Mechanical down tilt – Physic, Sectoral Electrical down tilt – Easy 0° 0° Electrical Mechanical
  71. 71. Typical antenna beam pattern
  72. 72. Omni vs. Sectorised• OMNI cells - more difficult to optimize – Electrical down tilt possible, however • same for entire cell – Parameters same for entire cell• Directional antenna – narrower beam easier to control interference – tilting less efficient with wider beams Sectorised cell site with different downtilt angles
  73. 73. Reference• Short Course “In Building DCS 1800 Coverage”, Mobile Communication Laboratory, 2009• Short Course “Drive Test UMTS”, Mobile Communication Laboratory, 2008• Short Course “Drive Test CDMA 2001x and Optimization”, Mobile Communication Laboratory, 2008• Short Course “CDMA Drive Test and Optimization”, Antenna Laboratory, 2007• Nemo_Outdoor_manual
  74. 74. Thanks

×