Dear All
this is final GSM BSS Network PS KPI
1. GSM BSS Network PS KPI (Download Rate) Optimization Manual.doc
2. GSM BSS Network Performance PS KPI (Upload Rate) Optimization Manual.doc
3. GSM BSS Network Performance PS KPI (Downlink TBF Establishment Success Rate) Optimization Manual.doc
4. GSM BSS Network PS KPI (Success Rate of Uplink TBF Establishments) Optimization Manual.doc
5. GSM BSS Network Performance PS KPI (RTT Delay) Optimization Manual.doc
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Koepret
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Content
1 Overview
1.1 Position of the GPRS or EGPRS Network in End-to-End Applications
1.2 Introduction to CQT and DT
1.3 Performance Baseline of the (E)GPRS Network
1.4 Introduction to Channel Resource Management Algorithm
1.5 Introduction to Link Quality Management Algorithm
1.6 Mechanism of Link Synchronization/Channel Synchronization
2 Thoughts About Identifying Download Rate Problems
2.1 Downloading Large-Sized Files in CQT in Idle Hours to Identify the Problem
2.1.1 Failure to Assign or Steadily Occupy Four Channels
2.1.2 Failure to Steadily Occupy a High Coding Scheme
2.1.3 Error Block
2.1.4 High Ratio of Control Blocks
2.1.5 Abnormal Release of TBF
2.1.6 High Transmission Rate at the RLC Layer But Low Transmission Rate at the Application Layer
2.2 Competition of the Download Rate through CQT
2.3 Comparision between DT downloading rates in busy and idle hours
3 Conclusion 33
3.1 Problem Identification
3.2 Routine Optimization
4 Appendices
4.1 Appendix 1: Parameter Description
4.2 Appendix 2: Optimization Manual for Parameters on Server and Test PC
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Koepret
Contents
1 Introduction
1.1 Similarities and Differences between Upload and Download
1.2 Factors Affecting the Upload Rate
2 Analysis and Optimization Methods
2.1 Uplink Bandwidth
2.2 Selection and Adjustment of Uplink Coding Schemes
2.3 Timely Return of the ACK Message for Uplink RLC Blocks
2.4 Timely Return of the ACK Message for Downlink TCP Blocks
2.5 Establishment and Release Flow of a TBF
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Koepret
GSM BSS Network Performance PS KPI (Downlink TBF Establishment Success Rate) Optimization Manual
Contents
1 Basic Principle
1.1 Counter Definition
1.1.1 Definition in the Case of No MS Response
1.1.2 Definition in the Case of No Available Resources
1.1.3 Definition in the Case of No MS Response or No Available Resources
1.2 Theory
2 Signaling Procedure
2.1 Number of Successful Downlink TBF Establishments
2.1.1 Description
2.1.2 Measurement Point
2.2 Number of Failed Downlink TBF Establishments
2.2.1 Description
2.2.2 Measurement Point
2.3 Number of Downlink TBF Establishment Attempts
2.3.1 Description
2.3.2 Measurement Point
3 Analysis and Optimization Methods
3.1 Checking the Abis Link
3.2 Checking the Delivery of Assignment Messages
3.2.1 Failed Downlink TBF Establishments Due to Overloaded CCCH
3.2.2 Failed Downlink TBF Establishments Due to No Channel Resources
3.3 Checking the Air Interface
3.4 Checking Failed Downlink TBF Establishments Due to No Response from the MS
3.4.1 Failed Downlink TBF Establishments Due to Improper Parameter Configurations
3.4.2 Failed Downlink TBF Establishments Due to Incorrect Information Elements in Assignment Messages
3.4.3 Failed Downlink TBF Establishments Due to Imbalance Between the Uplink and the Downlink
3.4.4 Checking the Feed System
3.4.5 Checking the KPIs of the PS Field
4 Cases
4.1 Case 1: Low Success Rate of Downlink TBF Establishment Due to Incorrect Frequency-Hopping Parameter Settings in Czech Republic
4.2 Case 2: Low Success Rate of Downlink TBF Establishment Due to No Responses from MSs After the PCU Is Upgraded
5 Problem Feedback
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Koepret
GSM BSS Network PS KPI (Success Rate of Uplink TBF Establishments) Optimization Manual
Contents
1 Basic Principle
1.1 Definition
1.1.1 Checking the Um Interface
1.1.2 Checking Resources
1.1.3 Simultaneously Checking the Um Interface and Resources
1.2 Theory Introduction
2 Signaling Procedure
2.1 Number of Successful Uplink TBF Establishments
2.1.1 Meaning
2.1.2 Measurement Point
2.2 Number of Failed Uplink TBF Establishments
2.2.1 Meaning
2.2.2 Measurement Point
2.3 Number of Uplink TBF Establishment Attempts
2.3.1 Meaning
2.3.2 Measurement Point
3 Analysis and Optimization Methods
3.1 Checking Abis Links
3.2 Checking Whether an Assignment Message Is Sent Normally
3.2.1 An Immediate Assignment Message Being Discarded due to CCCH Overload
3.2.2 Network Sending an Immediate Assignment Reject Message due to No Channel
3.3 Checking Downlink Um Interface
3.4 Checking Whether the MS Responds to an Assignment Command
3.4.1 Overhigh Uplink Encoding Mode
3.4.2 Improper Uplink Power Control Parameters
3.4.3 MS Not Accessing the Assigned Channel Timely due to Improper Parameter Settings
3.4.4 Information Elements Error in an Assignment Message
3.4.5 Uplink and Downlink Imbalance
3.4.6 Checking Antenna Feeder
3.4.7 CS KPIs
4 Cases
4.1 Case 1 Extended Attach Delay Caused by Improper Settings of Power Control Parameters of an Indoor Cell in Chengdu Network
4.2 Case 2 Low Success Rate of Uplink TBF Establishments Caused by Improper Settings of Frequency Hopping Parameters in the Network in Czech Republic
4.3 Case 3 Low Success Rate of Uplink TBF Establishments Caused by Improper Configuration of TMA Factor in the Network in White Russia Network
5 Feedback
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Koepret
GSM BSS Network PS KPI (RTT Delay) Optimization Manual
Contents
1 Overview
1.1 Definition
1.2 Ping Process Analysis
1.3 Introduction to Delay in the GPRS/EGPRS System
2 Analysis and Optimization of the RTT Delay
2.1 TBF Establishment and Release Delay Optimization
2.2 Data Transmission Delay Analysis
2.3 System Processing Delay
2.4 Transmission Delay between Network Elements
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Koepret
