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2G 3G UMTS Radio frequency Optimization Graduation
- 1. BY: TAQI YOSEF AUBEED ALI SATTAR ZEGEER RF:PLANNING AND OPTIMIZATION SUPERVISED BY ASSIST LEC. MUSTAFA J. KUTRAN & DR. LEC. WALAA Y. YOUNES CASES STUDY WITH APPLICA TION
- 2. AGENDA o DEFINE RFAND REVIEW OF MOBILE NETWORK o DEFINE THE RF ISSUES IN 2G AND 3G o METHODS OF FINDING FLUTY KPIS o STRATEGIES OF OPTIMIZATION o SUMMARY
- 3. The RF Scope:is the service and the network state between the user equipment(MS) and the cell or the BTS RF DOMAIN junction cables RRU Antenna Multi-band antenna terminal RF Equipment in the site cabinet Hybrid CPRI Cable Click icon to add picture
- 4. 2G: GSM NETWORKCOMPONENTS BTS BSC BTS BSC SS7 SMS system PSTN ISDN MSC/VLR GMSC HLR/AUC Other PLMN MS MS BTS BTS MS MS MS M2000 Server
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- 8. 3G UMTS-WCDMA The Spreadingis done either by direct multiplying the speeding code by the date to be sent or by X-OR them
- 9. RF Engineer hasTwo main Functions
- 10. EXAMPLE FOR COVERAGE STATUS IN A CITY RSR P: RE FE REN C E SI G N A L RE CEI V ED PO W E R( RX LTE PO W E R)
- 11. RF TARGET MAINKPI o CSSR (CALL SETUP SUCCESSFUL RATIO) o DCR (CALL DROP RATIO) o INCOMING AND OUTGOING HOSR (HANDOVER SUCCESSFUL RATIO) o CALL BLOCKING o THROUGHPUT (END USER INTERNET SPEED) o CONGESTIONS (CS/PS)
- 12. OPTIMIZATION FOR BADKPI There are two main ways to detect the faulty KPIs Customer care center collect users complains and localize them with their corresponding serving cells Drive Test o Organize DT for the complaint area Explore o Analysis the DT to found the main reasons for the bad service 1- Complains 2-Peroidically check the main KPI for the Whole BSC/RNC to identify worst cells
- 13. DT B YT EM S IN V E ST IG A TIO N , problem detection by TEMS discovery 1 - D R IV E TES T ME TH O D F OR OPT IMI ZA TI ON
- 14. HUAWEI TECHNOLOGIES CO.,LTD. Huawei Confidential Page 14 1-Hard-ware solution RF optimization involves adjustment of azimuths, tilts, antenna height, eNodeB transmit power, feature algorithms, and performance parameters. Optimization methods in different standards are similar, but each standard has its own measurement definition. Network Optimization Azimuth Adjustment Tilt Adjustment Adding new Sector Adding new site Power Adjustment Antenna Height
- 15. THE 2ND WAY ISTHE KPI CHECKING Parameter tuning to reduce TCH Congestion Rate in Huawei System
- 16. EX: PARAMETERS TUNINGFOR 2G TCH CONGESTION CASE 1- Add TRX (also add Freq List and corresponding logical channels) 2. TCH Traffic Busy Threshold(%) 3- RXLEV_ACCESS_MIN 4. SACCH ACCESSMulti-Frames and Radio Link Timeout 5. SDCCH Dynamic Adjustment 6. RACH Min.Access Level 7. Speech Version 8. TCH Immediate Assignment 9. Balance Traffic Allowed 10. Load HO Allowed 11. Direct Retry 12. SDCCH Dynamic Adjustment 13. Direct Retry and Cell Direct Try Forbidden Threshold 14. AMR TCH/H Prior Allowed Parameter tuning to reduce TCH Congestion Rate in Huawei System
- 17. HOW TO KNOWABOUT SOFT PARAMETERS TCH TRAFFIC BUSY THRESHOLD : WHEN TCH ASSIGNMENT RATE REACHES OR EXCEEDS THIS THRESHOLD BSC STARTS TO ASSIGNS HALFRATE CHANNELS. IF THIS PARAMETER IS SET TO VERY SMALL VALUE THERE WILL E HIGH TCH CONGESTION ON THE CELL. HOWEVER THIS PARAMETER WILL INCREASES CHANNEL USAGES RATE & ALSO DEGRADES SPEECH QUALITY. BY INCREASING THE VALUE OF THIS PARAMETER WE CAN GET RELIEF IN CONGESTION. RXLEV_ACCESS_MIN : THIS PARAMETER SPECIFIES THE MINIMUM RECEIVE LEVEL OF AN MS TO ACCESS THE BSS. IF THIS PARAMETER IS SET TO A TOO SMALL VALUE, SOME MSS WITH LOW RECEIVE LEVELS MAY ACCESS THE NETWORK AND TCH CONGESTION IS LIKELY TO OCCUR. YOU CAN SET THIS PARAMETER TO A GREAT VALUE TO REDUCE THE TCH CONGESTION RATE. THE COUNTERS SUCH AS CALL SETUP SUCCESS RATE AND THE COUNTERS RELATED TO TRAFFIC VOLUME, HOWEVER, ARE ACCORDINGLY AFFECTED. 1- HUAWEI DOCUMENTS 2-HUAWEI LIBRARY SUCH AS ICS LITE
- 18. Network recommended value Cause Analysis •CongestionKPIs analysis:- From the KPI can see many code congestion and DL Power congestion 2. Parameter setting verification Current setting
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- 20. Another Example: Asia-cellalso have “Net-chart” for KPI Monitoring and Plotting o STRONG MARKET POSITIONING o ROBUST GROWTH STRATEGY o INNOVATIVE PRODUCT DEVELOPMENT o COMMITMENT TO USER SATISFACTION
- 21. WELL THANKS Appreciate yourlicensing and now we are waiting your suggestions and questions Mustafa J. Kutran 2 1 Click icon to add picture
Editor's Notes
- #4 This diagram shows a simplified GSM network. The main components of a GSM System are: BSS, NSS and OMC The Mobile Station (MS) is the only direct part of the network that the subscriber can see. BSS means Base Station Subsystem. BSS is responsible for the system functions related to radio and transmission of the GSM system. BSS includes BSC and BTS. BSC means base station controller. BTS means base transceiver station. NSS means Network Subsystem. NSS is composed of MSC/VLR, HLR/AuC/EIR. NSS is the control and switching part of the whole GSM system. MSC means Mobile Switching Center. HLR means home location register. AuC means authentication center. EIR means equipment identification register. MSC provides the interface between GSM network and the Public Switched Telephone Network (PSTN). OMC means operation and maintenance center. It is used to configure and maintain the network from a central location. OMC is connected to BSS and NSS through LAN or WAN.