Aspects of Radio Network Topology Planning in Cellular WCDMA

**dmitry28** · 2012-03-19, 08:18 PM

1 Introduction 1
1.1 Background and Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Scope of the Thesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Main Results of the Thesis . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Role and Methods of Radio Network Topology Planning 7
2.1 Radio Network Planning Process . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Dimensioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.2 Detailed Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.3 Optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Assessment Methods of Topology . . . . . . . . . . . . . . . . . . . . . . 9
2.3 A Static Radio Network Planning Tool . . . . . . . . . . . . . . . . . . . 11
2.3.1 Relation of SIR and Other Cell Interference . . . . . . . . . . . . 11
2.3.2 Simulation Methodology . . . . . . . . . . . . . . . . . . . . . . 14
3 Basic Elements of Topology Planning 17
3.1 Coverage Overlap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1.1 Coverage Overlap Index . . . . . . . . . . . . . . . . . . . . . . . 19
3.1.2 Empirical Optimum COI . . . . . . . . . . . . . . . . . . . . . . 20
3.2 A Study of Site Locations and Sector Directions . . . . . . . . . . . . . . 23
3.2.1 Irregular Site Locations . . . . . . . . . . . . . . . . . . . . . . . 24
3.2.2 Irregular Sector Directions . . . . . . . . . . . . . . . . . . . . . . 27
3.3 Sectoring and Antenna Beamwidth . . . . . . . . . . . . . . . . . . . . . 29
3.3.1 Sector Overlap Index . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.4 Antenna Downtilt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.4.1 Antenna Downtilt Simulations . . . . . . . . . . . . . . . . . . . 35
3.4.2 Measured Performance of Mechanical Downtilt . . . . . . . . . 40
3.4.3 Possibilities for Utilization of RET . . . . . . . . . . . . . . . . . 42
3.5 Suppression of Pilot Polluted Areas . . . . . . . . . . . . . . . . . . . . . 44
3.5.1 Assessment through Simulations . . . . . . . . . . . . . . . . . . 46
3.5.2 MDT and Pilot Pollution in Measurements . . . . . . . . . . . . 47
3.6 Topology Planning during Site Evolution . . . . . . . . . . . . . . . . . 48
4 Verification Methods of Topology 51
4.1 Topology Verification through Measurements . . . . . . . . . . . . . . . 51
4.1.1 Air Interface Capacity Estimation Method . . . . . . . . . . . . 52
4.1.2 Performance of Capacity Evaluation Method . . . . . . . . . . . 53
4.2 Topology Verification through Simulations . . . . . . . . . . . . . . . . 56
5 Supplementary Radio Network Concepts 61
5.1 Repeaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5.1.1 Repeater Configuration . . . . . . . . . . . . . . . . . . . . . . . 62
5.1.2 Assessment through Simulations . . . . . . . . . . . . . . . . . . 62
5.1.3 Assessment through Measurements . . . . . . . . . . . . . . . . 65
5.2 Mobile Positioning Techniques . . . . . . . . . . . . . . . . . . . . . . . 66
5.2.1 Theoretical Accuracy of cell ID+RTT . . . . . . . . . . . . . . . . 67
5.2.2 Forced SHO algorithm . . . . . . . . . . . . . . . . . . . . . . . . 70
5.2.3 Trade-off between Optimum Topology and Availability of Cell
ID+RTT . . . . . . . . . . . . . . . . . . .