umts optimization parameter

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v1.62

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Course Duration:

3 Days

Course Description:

This course is targeted at engineers and technicians who are involved in the operation, optimization and troubleshooting of UTRA-networks.

This fascinating blend of practical experience and theoretical knowledge is a must for everybody who shall tune a UTRA-network.

The course starts with a detailed description of important UTRA-parameters throughout the various protocols and continues with the consideration of how specific parameter settings and setting combinations influence the system operation.

In another part, the course answers your questions with respect to network dimensioning and load aspects in both the terrestrial and the wireless parts of UTRA.

Finally, the course provides guidance on how and where to setup performance measurements for circuit-switched and packet-switched performance measurements within UTRA.

The course concludes with the detailed analysis of typical errors and failures in UTRA networks, discriminating mobile station issues from network problems.

As in all INACON courses we integrated several interactive exercises for a perfect learning experience. Pre-Requisites:

Previous practical exposure to network optimization and trouble shooting in GSM, GPRS or UMTS (second level) is required.

Very good understanding of the related UTRA- and NAS-protocols is necessary.

We strongly recommend to join our training courses “UMTS – Design Details & System Engineering” and “UMTS - Signaling & Protocol Analysis (RAN & UE)” before visiting this course.

Previous practical experience with network protocol testers and test UE’s (e.g. TEMS) is desirable.

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Course Target:

The student is enabled to troubleshoot and optimize UTRA FDD networks and UE’s.

Some of your questions that will be answered:

What does network performance in UMTS stand for and how does it compare to GSM- or GPRS-network performance?

How can I determine our actual network performance?

What is meaning of the parameter “Received-total-wide-band-power” which is conveyed from the NodeB to the RNC during radio link setup?

How can I measure and compare the quality (Bit Error Rate / Frame Erasure Rate) per cell, per NodeB or per RNS on the Iub-Interface for both uplink and downlink?

How can I distinguish application and user equipment failures which are outside of our scope from real network problems?

What is the meaning of the various timers and counters which are broadcast in the System Information Blocks

Which system parameters can I tune to optimize the UE’s idle mode behavior? (e.g. S-intrasearch, t-Reselection-S, Qhyst, Qoffset, ...)?

How can I nail down performance bottlenecks in the different parts of our network?

How can I minimize the interference through the use of diversity transmission methods?

How can I optimize the network access procedure for both, minimum delay times and minimum interference.

What is the optimum configuration of the different RLC counter and timer values (e.g. Max-DAT, timerPoll, transmissionWindowSize, …) to provide the best possible service for transparent, unacknowledged and acknowledged operation modes.

What are the best measurement tools for the Uu-interface and within UTRA?

Who should attend this class?

Network operator staff who are involved in the optimization of UTRA and who need to continuously improve the network performance

System vendors who are involved in second and third level troubleshooting activities

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Table of Contents: The Idle Mode Behavior of the UE – Optimization of the related Parameters 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)) ⇒ tion Broadcast PLMN-Identification through System Informa

SIB Scheduling Information – Example SIB5 ⇒ Prioritization of PLMN’s

Conclusions and Suggestions

The Cell Selection Process

⇒ eters Measurement ParamRSSI UTRA Carrier

CPICH RSCP CPICH Ec/No

n for UTRA-FDD Cells ⇒ The Cell Selection Criterio⇒ Cell Selection Criterion S ⇒ Meaning of Q-Qualmin and Q-Rxlevmin

Q-Rxlevmin, UE_TXPWR_MAX_RACH in SIB3⇒ Q-Qualmin,

⇒ Q-Rxlevmin

ocess

AN n UTRAN

⇒ on HCS

f Different Settings of:Implications o

⇒ Q-Qualmin

The Cell Reselection Pr⇒ Initial Considerations ⇒ Options for Neighbor Cell Configuration in UTR⇒ General Rules for Cell Reselection i

S-x search Thresholds – NS-Qual <= S-Intrasearch S-Qual <= S-Intersearch S-Qual <= S-SearchRAT”m”

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⇒ tup Success 00 Timeout

ng of RRC Connection Establishment

⇒ erion

lectQualityMeasure” is for Serving Cell

Description in SIB 11

⇒ eighbor Cells with HCS

q NC in SIB 11

3

or fast moving UE’s

⇒ rchRAT ⇒ Considerations for a HCS network with same HCS_PRIO values for all Cells

/2G

⇒ n 2G-Cells

⇒⇒

T-Reselection and T300 for Call SeCell Re-selection or T3T-Reselection Setting T300 - Guardi

⇒ Cell Ranking The Cell Ranking CritFor the Serving Cell: Consideration of the Parameter “CellSeQ-Hyst-S – HysteresFor Neighbor Cells Q-offset-S-N – Offset for Neighbor Cells

⇒ Example of an Intra-Frequency NC

Hierarchical Cell Structures (HCS) ⇒ The Quality Threshold Criterion H for Serving Cell ⇒ Quality Threshold Criterion H Usage

The Quality Threshold Criterion H for NTrigger 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-Fre

Measurement Rules for fast moving UE’s

Serving Cell in SIB⇒ Important HCS-Parameters for theeasurement Rules fExample of M

⇒ 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-Sea

Parameter Values and Ranges for HCS

Measurement Thresholds within 3G and for 3G Measurement Thresholds while Camping o

⇒ 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 3GMeasurement 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

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⇒

ement Reporting and Channel Type

Switch Parameters Th

⇒⇒

dom Access Layer 2 Parameters required for Random Access

e

⇒ Determination of the Preamble Initial Power

trol

edure ⇒

Ramp Step

n Timing The MAC-Random Access Pro

⇒

om Number R art 1)

Part 2)

s Procedure

meter ASC-Setting 01min and NB01max

ccess Procedure Parameters in SIB 5

Radio Link Control ⇒

Maximum Number of Inter RAT Neighbors for GSM

_______________________________________ RRC-Connection Management, Measur

ing – Optimization of the related

e Random Access Procedure Initial Conditions and Overview Layer 2 Random Access Procedure Layer 1 Parameters required for Ran

Flow of Layer 2 Random Access ProcedurLayer 1 Random Access Procedure

The Physical Random Access Procedure

The Formula ⇒ The Issue of UE Inaccuracies for Open Loop Power Con

Conclusions and Suggestions ⇒ Parameters of the Physical Random Access Proc

Setting up the Parameter Constant Value ⇒ Setting up the Parameter Power⇒ 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-Transmissio

cedure 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 Rand

⇒ Interworking of MAC and Physical Random Access (PAccess (⇒ Interworking of MAC and Physical Random

Conclusions and Suggestions ces⇒ Parameters of the MAC Random Ac

⇒ Setting up the Persistence Scaling Factors Setting up Mmax ⇒

⇒ Setting up the Para⇒ Setting up NB⇒ Random A

Introduction

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⇒

⇒

⇒

iscard without explicit Signaling

ment of VT(US) ⇒⇒ oS ⇒ S

r te Variables tate Variables

n Window

⇒ M Data Transfer ⇒ ds in RLC-AM

U Generation er

⇒ eration – Lowering RLC Goodput

r Poll_Prohibit in RLC-AM

uccessful Different Settings of:

⇒⇒⇒⇒ ll

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 D

⇒ RLC-UM Buffering and Discarding Unacknowledged Mode Discard Timer Based Discarding with Incre Timer Discard (1) RLC Discarding considering Q (2) RLC Discarding considering Qo

⇒ Parameter and Timer in RLC-AM RLC Timers

meteRLC Protocol ParataRLC-AM Sender S

RLC-AM Receiver S⇒ RLC-AM Transmission and Receptio

Transmission Window Reception Window

⇒ TX_Window_Size ⇒ RX_Window_Size

Example for RLC-A (1) Polling Metho

⇒ RLC-AM Duplicate PDHandling of Duplicate AMD PDU’s at the Receiv Duplicate PDU GenTransmitting Side Receiving Side

⇒ Timer_Poll_Periodic⇒ Timer_Poll and Time

Polling Successful Polling Uns

⇒ Implications of⇒ Timer_Poll ⇒ Timer_Poll_Prohibit ⇒ Poll every Poll_PDU

Poll_SDU Poll_Window Last Transmission PDU Poll

DU Po Last Re-transmission P

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Mechanism in RLC-AM

icator

erflow Protection in RLC-AM aling

ns

⇒transmissions

er 2 Drop

⇒⇒

RR

⇒TRAN

sion of RRC_CONN_REQ lection but neither Cell Updates nor URA

Procedures

ay be available l

⇒plink or Downlink Direction

ble

⇒ STATUS Transmission Missing PDU Indicator Timer Based Timer_Status_Prohibit EPC Based Retransmission

⇒ Missing PDU Ind⇒ Timer_Status_Prohibit ⇒ Timer_Status_Periodic ⇒ Buffer Ov

Timer based SDU Discard with explicit Sign⇒ SDU Discard after MaxDAT Retransmissio⇒ (1) MRW SUFI

(2) MRW SUFI ⇒ No Discard after MaxDAT Re⇒ MaxDAT ⇒ MaxDAT ⇒ RLC Unrecoverable Error – Lay⇒ MaxRST

RESET versus MRW RESET versus MRW Screenshot of Layer 2 Drop RLC-AM Setting and their Influence on TCP/IP

C-Connection Management RRC-Idle Mode UE is unknown in UNo DCCH’s or DTCH’s exist UE monitors PICH / PCH in Downlink (⇔ DRX) Change to RRC-Connected Mode requires TransmisUE performs Autonomous Cell ReseUpdates UE Performs Routing and Location Area Update

⇒ CELL_DCH-State DCH’s exist in Uplink and Downlink Direction DCCH’s are available and can be used; DTCH’s mUTRAN knows the Location of the UE on Cell LeveHandover 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 UDCCH’s are available; DTCH’s may be available UE continuously monitors one FACH in Downlink No Soft or Hard Handover Scenarios are applicaUE performs Cell Updates but no URA Updates UTRAN knows the Location of the UE on Cell Level UE provides Measurement Reports to the RNC

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⇒

H’s) are configured but cannot be used in this State

date) ble

n Cell Level eports to the RNC

⇒

t cannot be used in this State (⇔ DRX) ange to CELL_FACH ( Cell Update)

licable

the UE on URA Level orts to the RNC

nd Latency

ents urements

⇒⇒ rements ⇒

al-Measurements s

dical Reporting easurement Reporting g

vent Triggered Periodical Reporting

)

⇒ Filter-Coefficient ⇒

⇒

CELL_PCH-State No DCH’s exist in Uplink and Downlink DirectionDCCH’s (and DTCUE monitors PICH / PCH in Downlink (⇔ DRX) Uplink Transmission requires State Change to CELL_FACH ( Cell UpNo Soft or Hard Handover Scenarios are applicaUE performs Cell Updates but no URA Updates UTRAN knows the Location of the UE oUE provides Measurement R URA_PCH-State No DCH’s exist in Uplink and Downlink DirectionDCCH’s (and DTCH’s) are configured buUE monitors PICH / PCH in Downlink

te ChUplink Transmission requires StaNo Handover Scenarios are App

s UE performs URA UpdateUTRAN knows the Location of

ent RepUE provides Measurem⇒ Dependency of RRC-State a

Overview of Downlink Measurem⇒ Intra-Frequency Meas⇒ Inter-Frequency Measurements

Inter-RAT-Measurements Traffic Volume-Measu Quality-Measurements

⇒ UE Intern⇒ UE-Positioning-Measurement

Measurement Control ⇒ Event-triggered vs. Perio

Event-Triggered MPeriodical ReportinSHO Event 1A - E

⇒ Filtering ⇒ Cell Individual Offsets (CIO Other Important Measurement Parameters ⇒ Measurement Quantity

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

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rements ⇒ Event ID 1A: Primary CPICH enters the reporting range

mary

⇒ Event ID 1E: Primary CPICH becomes better than an absolute threshold rimary CPICH becomes worse than an absolute threshold

rer Control

___ _____________ Call T Typical Failure Cases

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)

Intra-Frequency Measu

⇒ Event ID 1B: Primary CPICH leaves the reporting range ⇒ Event ID 1C: Non-active primary CPICH becomes better than an active pri

CPICH ⇒ Event ID 1D: Change of best cell

⇒ Event ID 1F: P⇒ Triggering Event ID 1A

Traffic Volume Measurements and Radio Bea

_______________________race & Trouble Shooting in UTRAN –

(1) Call Tracing

umts optimization parameter

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