High-speed Railway Quality Improvement Technical Solution - Existing Network Optimization Technical Solution (Guangdong) High-speed Railway Existing Network Optimization Technical Solution China Mobile Communications Group Guangdong Co., Ltd. June 2007 [pic] Contents I. Introduction 4 II. Research Background 5 2.1 Railway Speed Increase 5 2.2 Introduction to CRH [1] 5 III. Analysis of the Impact of High-speed Trains on Existing Network Quality 6 3.1 Penetration Loss 6 3.2 Coverage Signal Strength Requirements 6 3.2.1 Minimum Signal Strength Requirements for Mobile Phones in a Single Cell 6 3.2.2 Minimum Signal Strength Considering Handover 6 3.2.3 Cell Coverage Radius 7 3.3 Overlapping Areas of Adjacent Cells 8 3.3.1 Cell Reselection in Idle Mode 8 3.3.2 Handover in Active Mode 10 3.4 Summary 10 IV. Optimization Strategies for High-speed Railways 11 4.1 Coverage Optimization 11 4.2 Reselection and Handover Algorithm Optimization 11 4.3 Private Network Coverage and Existing Network Adjustment 11 4.3.1 Similarities between private network coverage and existing network adjustment 12 4.3.2 Differences between private network coverage and existing network adjustment 12 4.3.3 Analysis of technical characteristics of private network coverage and existing network adjustment 12 4.3.4 Integration of existing network adjustment and private network coverage 13 V. Existing network coverage optimization technology 14 5.1 Arrangement of the sequence of existing network coverage cells 14 5.2 Signal adjustment of GSM1800 network 14 5.3 Adjustment of antennas of existing network coverage cells 14 5.4 Splitting the fourth cell 17 5.5 Power division sector 18 5.6 Application of power amplifier 20 5……
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