ABSTRACT
Contents 5.1 Physical Layer of TD-SCDMA ........................................................ 190
5.1.1 Transport Channels ............................................................ 190 5.1.2 Physical Channels ............................................................... 191 5.1.3 Mapping of Transport Channels to Physical Channels ............ 194 5.1.4 Physical Layer Procedures in TD-SCDMA Systems ................ 195
5.1.4.1 Power Control ..................................................... 195 5.1.4.2 Uplink Synchronization ........................................ 195 5.1.4.3 Cell Search .......................................................... 196 5.1.4.4 Random Access Procedure ..................................... 197
5.1.5 Physical Layer Techniques in TD-SCDMA Systems ............... 199 5.2 Coverage Planning ......................................................................... 201
5.2.1 Coverage Region Partition ................................................... 201 5.2.2 Link Budget ....................................................................... 203
5.2.2.1 EIRP ................................................................... 203 5.2.2.2 Space Propagation Loss ......................................... 204 5.2.2.3 Minimum Input Level Sensitivity ........................... 204 5.2.2.4 Maximum Coverage Radius Calculation .................. 205
5.2.3 Link Balance ...................................................................... 205 5.3 Capacity Planning .......................................................................... 206
5.3.1 Factors Influencing System Capacity ..................................... 206
5.3.2 Service Types in TD-SCDMA Systems ................................. 207 5.3.2.1 CS ...................................................................... 207 5.3.2.2 PS ....................................................................... 208
5.3.3 Interference Analysis ........................................................... 209 5.3.3.1 Multiple Access Interference (MAI) ........................ 209 5.3.3.2 Up-and Downlink Interference ............................. 209
5.3.4 Capacity Analysis ................................................................ 212 5.3.4.1 Interference Limited Capacity ................................ 212 5.3.4.2 Code Resources Limited Capacity ........................... 214 5.3.4.3 Capacity Estimation .............................................. 214
5.4 Radio Resource Planning ................................................................ 215 5.4.1 Radio Parameters in TD-SCDMA Systems ............................ 216
5.4.1.1 Network Identity Parameters ................................. 216 5.4.1.2 Cell Basic Parameters ............................................ 217 5.4.1.3 Power Coverage Parameters ................................... 217 5.4.1.4 Cell Access Parameters .......................................... 218
5.4.2 Radio Resources in TD-SCDMA Systems ............................. 218 5.4.3 Frequency Resource Planning ............................................... 219
5.4.3.1 Interference Brought by Frequency Reuse ................ 219 5.4.3.2 Single-Cell Carrier Frequency Configuration ........... 220 5.4.3.3 Network Organization Mode ................................. 221
5.4.4 Time Slot Resource Planning ............................................... 223 5.4.5 Code Resource Planning ...................................................... 223
5.4.5.1 TD-SCDMA Code Resources ................................ 223 5.4.5.2 Scrambling Code Configuration ............................. 224
5.5 Introduction of Network Optimization ............................................ 225 5.5.1 Categories of Network Optimization .................................... 225 5.5.2 Network Optimization of TD-SCDMA ................................ 225
5.6 Conclusion ................................................................................... 226 References .............................................................................................. 227
5.1 Physical Layer of TD-SCDMA 5.1.1 Transport Channels A typical TD-SCDMA wireless network can be divided into two parts: radio access network (RAN) and core network (CN) [1]. The physical layer offers data transport services to higher layers via the transport channel. A transport channel is defined by how the data is transferred over the air interface. In 3GPP specifications, transport channels are classified into two groups [2]: dedicated transport channel (DTrCH) and common transport channel (CTrCH).
