GSM BSS Network KPI (TCH Call Drop Rate) Optimization Manual

[koepret]

GSM BSS Network KPI (TCH Call Drop Rate) Optimization Manual

Contents
1 Overview of the TCH Call Drop Rate
1.1 Meaning
1.2 Recommended Formulas
1.3 Signaling Procedure and Measurement Points
2 Factors That Affect the TCH Call Drop Rate
2.1 Hardware Failure
2.2 Transmission Problem
2.3 Version Upgrade
2.4 Parameter Setting
2.5 Intra-Network and Inter-Network Interference
2.6 Coverage Problem
2.7 Antenna System Problem
2.8 Imbalance Between Uplink and Downlink
2.9 Repeater Problem
3 Analysis of and Solutions to High TCH Call Drop Rate
3.2 Solutions to High TCH Call Drop Rate
3.2.1 Checking the Hardware
3.2.2 Checking the Transmission
3.2.3 Checking the BSC and BTS Version Upgrade
3.2.4 Checking the Parameter Settings
3.2.5 Checking the Interference
3.2.6 Checking the Coverage
3.2.7 Checking the Antenna System
3.2.8 Checking the Balance Between Uplink and Downlink
3.2.9 Checking the Repeaters
4 Test Methods
5 Remarks About the Signaling Analysis of the TCH Call Drop Rate
6 Cases for TCH Call Drop Rate Optimization
6.1 Case 1: Call Drop Due to Interference
6.2 Case 2: Call Drop Due to Imbalance Between Uplink and Downlink
6.3 Case 3: Call Drop Due to Repeater Problem
6.4 Case 4: Call Drop Due to Coverage
6.5 Case 5: Reduction of Call Drops by Optimizing Handover Parameters
6.6 Case 6: Call Drop Due to Inappropriate Parameter Setting
6.7 Case 7: Call Drop Due to TRX Board Fault
6.8 Case 8: Call Drop Due to Antenna System Problem
6.9 Case 9: Call Drop Due to Transmission Problem
6.10 Case 10: Call Drop Rate Doubled in a CoBCCH Network After Upgrade from V9R1 to V9R3
6.11 Case 11: Increase in Call Drop Rate Due to Inactivity of T305 and T308
6.12 Case 12: Increase in Call Drop Rate Due to Change of TR1N on the MSC Side
7 Feedback Form for the TCH Call Drop Rate



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Complete list of this GSM BSS Network KPI Optimization Manual

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