2g Optimization

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GSM Radio Network Optimization
Who should attend
This course meets the requirements from experienced professionals, dealing with operational and planning aspects of the GSM radio network. Initially, the course gives a detailed description of the GSM system functionality, including the GPRS and EDGE radio enhancements. Further on, the course elaborates on essential radio performance issues and presents a methodology to identify and analyse typical problem areas. Optimization alternatives are given, aiming to resolve poor radio performance in mentioned problem areas.

Course Content
GSM and GPRS system overview
    BSS systems and interfaces A/A-bis/Gb CS and PS core network systems Mobility management in idle and connected mode MT and MO traffic cases for CS and PS services

GSM radio interface
         Logical and Physical channels in GSM and GPRS Channel capacity allocation for GPRS and TBF establishment TDMA Frame and Multi-Frame structures Mapping of timeslots between Um and A-bis interfaces E-GPRS enhancements and additions Modulation, Channel coding and multiplexing Voice codecs (AMR/FR/HR) and their algorithms Link adaptation and retransmission in GSM and GPRS/EDGE Detailed MS-BSC call flows for MO and MTC calls

Radio coverage/capacity and neighbour cell relation issues
          Multiband cells and Hierarchical cell structures Cell selection and re-selection parameter options BTS Power control and its algorithm Adjacent- and co-channel interference Frequency hopping configuration options with MAIO feature Cell load sharing and directed retry Configuration options for SDCCH and PCCH channels SDCCH/TCH (immediate) assignment procedure details Handover types and measurement reporting Locating algorithms with various cell ranking criteria

Radio network performance evaluation
   Drive test and available tools Call Quality tests and available tools Key Performance indicators for GSM BSS

     

Analysis of call drop rates Analysis of TCH congestion rates Analysis of SDCCH congestion rates Handover success rate analysis Analysis of paging failures Coverage and interference related analysis

Optimization alternatives against high call drop problems
        Call drop due to handover reasons Call drop due to coverage reasons Call drop due to interference Call drop due to FH collisions Call drop due to transmission reasons Physical antenna re-location and tilting (interference/shadow problem) Case 1: Call drop caused by isolated island effect Case 2: Reduce call drop rate through optimizing handover parameters

Optimization alternatives against handover failures
     Failure due to handover cannot be initiated Failure due to HW fault Failure due to inconsistent parameterization Case 1: No handover candidate cell available due to CGI error Case 2: Low handover success rate due to non-feasible antenna positioning

Optimization alternatives against congestion problems
        Heavy traffic related congestion SDCCH congestion caused by burst traffic Congestion caused by TRX problems Interference related congestion Data configuration inconsistency related congestion Case 1: SDCCH congestion caused by wrong LAC configuration Case 2: SDCCH congestion caused by burst location updates Case 3: TCH congestion caused by inconsistent multi-antenna tilt in same cell

Duration: 3 days full time

Course Documentation

Part 1: GSM and GPRS system and Radio details Part 2: GSM Radio Network Optimization

GSM GPRS System and Radio
1 2 MOBILE SYSTEMS STANDARDIZATION ................................................ 1 1.1 2.1 2.2 2.3 2.4 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 4 4.1 4.2 5 6 OLDER GENERATION STANDARDS (1G) ........................................................ 1 GSM .......................................................................................................... 3 D-AMPS...
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