pdf_gross.gifUMTS - Network Optimization & Trouble Shooting

[3-day course, Euro 3,450.- (net) per participant]

backtotop.gifThe Idle Mode Behavior of the UE – Optimization of the related Parameters

Course Description

  • Constraints of the PLMN and Cell Selection Procedure
    • SIM/USIM Configuration
    • UE Radio Access Capabilities
    • Network
  • NAS Aspects of the PLMN and Cell Selection Procedure
  • NAS-Selection of the PLMN
    • User Controlled PLMN Selector with Access Technology (<-> 3GTS 11.11 (10.3.35))
    • Operator Controlled PLMN Selector with Access Technology (<-> 3GTS 11.11 (10.3.36))
    • H-PLMN Selection with Access Technology (<-> 3GTS 11.11 (10.3.37))
    • PLMN-Identification through System Information Broadcast
      - SIB Scheduling Information – Example SIB5
    • Prioritization of PLMN’s
  • Conclusions and Suggestions
  • The Cell Selection Process
    • Measurement Parameters
      - UTRA Carrier RSSI
      - CPICH RSCP
      - CPICH Ec/No
    • The Cell Selection Criterion for UTRA-FDD Cells
    • Cell Selection Criterion S
    • Meaning of Q-Qualmin and Q-Rxlevmin
    • Q-Qualmin, Q-Rxlevmin, UE_TXPWR_MAX_RACH in SIB3
  • Implications of Different Settings of:
    • Q-Qualmin
    • Q-Rxlevmin
  • The Cell Reselection Process
    • Initial Considerations
    • Options for Neighbor Cell Configuration in UTRAN
    • General Rules for Cell Reselection in UTRAN
    • S-x search Thresholds – Non HCS
      - S-Qual <= S-Intrasearch
      - S-Qual <= S-Intersearch
      - S-Qual <= S-SearchRAT”m”
    • T-Reselection and T300 for Call Setup Success
      - Cell Re-selection or T300 Timeout
      - T-Reselection Setting
      - T300 - Guarding of RRC Connection Establishment
    • Cell Ranking
    • The Cell Ranking Criterion
      - For the Serving Cell:
      - Consideration of the Parameter “CellSelectQualityMeasure”
      - Q-Hyst-S – Hysteresis for Serving Cell
      - For Neighbor Cells
      - Q-offset-S-N – Offset for Neighbor Cells
    • Example of an Intra-Frequency NC Description in SIB 1
  • Hierarchical Cell Structures (HCS)
    • The Quality Threshold Criterion H for Serving Cell
    • Quality Threshold Criterion H Usage
    • The Quality Threshold Criterion H for Neighbor Cells with HCS
      - Trigger Conditions for Timer T(n)
      - Timer T(n) and Temporary Offset for H
    • The Cell Ranking Criterion for Neighbor Cells with HCS
    • Timer T(n) and Temporary Offset for R
    • Important HCS-Parameters for an Intra-Freq NC in SIB 11
  • Measurement Rules for fast moving UE’s
    • Important HCS-Parameters for the Serving Cell in SIB 3
      - Example of Measurement Rules for fast moving UE’s
    • Cell Reselection Rules with HCS
      - High Mobility
    • (1) HCS and Non HCS Cell Ranking
    • (2) HCS and Non HCS Cell Ranking
    • (3) HCS and Non HCS Cell Ranking
    • Setting up S-Intrasearch and S-Intersearch
    • Setting up S-SearchRAT and S-Limit-SearchRAT
    • Considerations for a HCS network with same HCS_PRIO values for all Cells
      - Parameter Values and Ranges for HCS
  • Measurement Thresholds within 3G and for 3G/2G
    • Measurement Thresholds while Camping on 2G-Cells
    • Example for Measurements on WCDMA Cells
  • Cell Reselection from GSM to UTRAN
    • Algorithm for Cell Re selection from GSM to UTRAN
    • Cell Reselection Criterion from 2G to 3G
      - Measurement Quantity for other RAT – UTRAN FDD
      - Cell Reselection Timing from 2G to 3G
    • FDD_Qoffset
    • Applicability of Qsearch_I, Qsearch_C_Initial and Qsearch_C
    • Maximum Number of Inter RAT Neighbors for GSM

backtotop.gif RRC-Connection Management, Measurement Reporting and Channel Type Switching – Optimization of the related Parameters

  • The Random Access Procedure
    • Initial Conditions and Overview
    • Layer 2 Random Access Procedure
      - Layer 1 Parameters required for Random Access
      - Layer 2 Parameters required for Random Access
      - Flow of Layer 2 Random Access Procedure
      - Layer 1 Random Access Procedur
  • The Physical Random Access Procedure
    • Determination of the Preamble Initial Power
      The Formula
    • The Issue of UE Inaccuracies for Open Loop Power Control
  • Conclusions and Suggestions
    • Parameters of the Physical Random Access Procedure
    • Setting up the Parameter Constant Value
    • Setting up the Parameter Power Ramp Step
    • Setting up the Parameter Max No of Preambles
      Constant Value / Power Ramp Step and Max No of Preambles
    • Setting up the Parameter Pp-m
    • Setting up the Parameter AICH-Transmission Timing
  • The MAC-Random Access Procedure
    • Determination of the Access Priority
      - Transfer of an RRC_CONN_REQ-Message
      - Other Cases (MLP)
      - Determination of the Persistence Value P
      - Persistence Value P and Random Number R
    • Interworking of MAC and Physical Random Access (Part 1)
    • Interworking of MAC and Physical Random Access (Part 2)
  • Conclusions and Suggestions
    • Parameters of the MAC Random Access Procedure
    • Setting up the Persistence Scaling Factors
    • Setting up Mmax
    • Setting up the Parameter ASC-Setting
    • Setting up NB01min and NB01max
    • Random Access Procedure Parameters in SIB 5
  • Radio Link Control
    • Introduction
    • Overview
      - TMD
      - UMD
      - AMD
      - AMD Continued (1)
      - AMD Continued (2)
    • One or Two Logical Channels for RLC-AM
    • SDU Discard Function
    • RLC-TM Buffering and Discarding
      - SDU Discard not Configured - No Timer Discard
      - Timer based Discard without explicit Signaling
    • RLC-UM Buffering and Discarding
      - Unacknowledged Mode Discard
      - Timer Based Discarding with Increment of VT(US)
    • Timer Discard
    • (1) RLC Discarding considering QoS
    • (2) RLC Discarding considering QoS
    • Parameter and Timer in RLC-AM
      - RLC Timers
      - RLC Protocol Parameter
      - RLC-AM Sender State Variables
      - RLC-AM Receiver State Variables
    • RLC-AM Transmission and Reception Window
      - Transmission Window
      - Reception Window
    • TX_Window_Size
    • RX_Window_Size
    • Example for RLC-AM Data Transfer
    • (1) Polling Methods in RLC-AM
    • RLC-AM Duplicate PDU Generation
      - Handling of Duplicate AMD PDU’s at the Receiver
    • Duplicate PDU Generation – Lowering RLC Goodput
      - Transmitting Side
      - Receiving Side
    • Timer_Poll_Periodic
    • Timer_Poll and Timer Poll_Prohibit in RLC-AM
      - Polling Successful
      - Polling Unsuccessful
    • Implications of Different Settings of:
    • Timer_Poll
    • Timer_Poll_Prohibit
    • Poll every Poll_PDU
    • Poll_SDU
    • Poll_Window
    • Last Transmission PDU Poll
    • Last Re-transmission PDU Poll
    • STATUS Transmission Mechanism in RLC-AM
      - Missing PDU Indicator
      - Timer Based
      - Timer_Status_Prohibit
      - EPC Based Retransmission
    • Missing PDU Indicator
    • Timer_Status_Prohibit
    • Timer_Status_Periodic
    • Buffer Overflow Protection in RLC-AM
      - Timer based SDU Discard with explicit Signaling
    • SDU Discard after MaxDAT Retransmissions
    • (1) MRW SUF
    • (2) MRW SUFI
    • No Discard after MaxDAT Retransmissions
    • MaxDAT
    • MaxDAT
    • RLC Unrecoverable Error – Layer 2 Drop
    • MaxRST
      - RESET versus MRW
      - RESET versus MRW
    • Screenshot of Layer 2 Drop
    • RLC-AM Setting and their Influence on TCP/IP
  • RRC-Connection Management
    • RRC-Idle Mode
      - UE is unknown in UTRAN
      - No DCCH’s or DTCH’s exist
      - UE monitors PICH / PCH in Downlink (<-> DRX)
      - Change to RRC-Connected Mode requires Transmission of RRC_CONN_REQ
      - UE performs Autonomous Cell Reselection but neither Cell Updates nor URA Updates
      - UE Performs Routing and Location Area Update Procedures
    • CELL_DCH-State
      - DCH’s exist in Uplink and Downlink Direction
      - DCCH’s are available and can be used; DTCH’s may be available
      - UTRAN knows the Location of the UE on Cell Level
      - Handover Scenarios are Applicable
      - UE performs no Cell Updates or URA Updates
      - UE provides Measurement Reports to the RNC
    • CELL_FACH-State
      - No DCH’s exist in Uplink or Downlink Direction
      - DCCH’s are available; DTCH’s may be available
      - UE continuously monitors one FACH in Downlink
      - No Soft or Hard Handover Scenarios are applicable
      - UE performs Cell Updates but no URA Updates
      - UTRAN knows the Location of the UE on Cell Level
      - UE provides Measurement Reports to the RNC
    • CELL_PCH-State
      - No DCH’s exist in Uplink and Downlink Direction
      - DCCH’s (and DTCH’s) are configured but cannot be used in this State
      - UE monitors PICH / PCH in Downlink (<-> DRX)
      - Uplink Transmission requires State Change to CELL_FACH (<-> Cell Update)
      - No Soft or Hard Handover Scenarios are applicable
      - UE performs Cell Updates but no URA Updates
      - UTRAN knows the Location of the UE on Cell Level
      - UE provides Measurement Reports to the RNC
    • URA_PCH-State
      - No DCH’s exist in Uplink and Downlink Direction
      - DCCH’s (and DTCH’s) are configured but cannot be used in this State
      - UE monitors PICH / PCH in Downlink (<-> DRX)
      - Uplink Transmission requires State Change to CELL_FACH (<-> Cell Update)
      - No Handover Scenarios are Applicable
      - UE performs URA Updates
      - UTRAN knows the Location of the UE on URA Level
      - UE provides Measurement Reports to the RNC
    • Dependency of RRC-State and Latenc
  • Overview of Downlink Measurements
    • Intra-Frequency Measurements
    • Inter-Frequency Measurement
    • Inter-RAT-Measurements
    • Traffic Volume-Measurements
    • Quality-Measurements
    • UE Internal-Measurements
    • UE-Positioning-Measurements
  • Measurement Control
    • Event-triggered vs. Periodical Reporting
      - Event-Triggered Measurement Reporting
      - Periodical Reporting
      - SHO Event 1A - Event Triggered Periodical Reporting
    • Filtering
    • Cell Individual Offsets (CIO)
  • Other Important Measurement Parameters
    • Measurement Quantity
    • Filter-Coefficient
    • Weighting Factor
    • Reporting Range
    • Hysteresis
    • Periodic Event Reporting
    • Time-to-Trigger
    • Reporting Range (only Event ID 1A and 1B)
    • Parameterization in the RRC:MEAS_CTRL-Message
  • Intra-Frequency Measurements
    • Event ID 1A: Primary CPICH enters the reporting range
    • Event ID 1B: Primary CPICH leaves the reporting range
    • Event ID 1C: Non-active primary CPICH becomes better than an active primary CPICH
    • Event ID 1D: Change of best cell
    • Event ID 1E: Primary CPICH becomes better than an absolute threshold
    • Event ID 1F: Primary CPICH becomes worse than an absolute threshold
    • Triggering Event ID 1A
  • Traffic Volume Measurements and Radio Bearer Control

backtotop.gifCall Trace & Trouble Shooting in UTRAN – Typical Failure Cases

  • Call Tracing
  • DPCCH In-Sync and Out-of-Sync Detection
    • Uplink Synchronization Estimation in NodeB
    • Downlink Synchronization Estimation in UE
    • Radio Link Failure Downlink (Option 1)
    • Radio Link Failure Downlink (Option 2)
    • Radio Link Failure Uplink (Option 1)
    • Radio Link Failure Uplink (Option 2)

v1.62

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