ABSTRACT
Contents 8.1 Introduction ................................................................................. 298 8.2 System Architecture ....................................................................... 300 8.3 Model of the Full-Availability Group with Multirate BPP Traffic ........ 303
8.3.1 Basic Assumptions .............................................................. 303 8.3.2 Multidimensional Erlang-Engset Model
at the Microstate Level ........................................................ 304 8.3.3 Full-Availability Group with BPP Traffic
at the Macrostate Level ........................................................ 305 8.3.4 MIM-BPP Method ............................................................. 308
8.3.4.1 Method MIM-BPP ............................................... 308 8.4 Model of the Full-Availability Group with Traffic Compression .......... 309
8.4.1 Basic Model of the Full-Availability Group with Compression .............................................................. 310
8.4.2 Model of the Full-Availability Group with Uneven Compression ................................................... 314
8.5 Modeling and Dimensioning of the Radio Interface ........................... 314 8.5.1 Resource Allocation in Mobile Systems with Soft Capacity ...... 315
8.5.1.1 Uplink ................................................................ 317
8.5.1.2 Downlink ............................................................ 318 8.5.2 Allocation Units in the WCDMA Radio Interface .................. 319 8.5.3 Analytical Model of the WCDMA Interface ........................... 320
8.5.3.1 Blocking (and Loss) Probability .............................. 321 8.5.3.2 Average Throughput ............................................. 321 8.5.3.3 Downlink Direction ............................................. 322 8.5.3.4 Uplink Direction .................................................. 322 8.5.3.5 Average Throughput Available for HSPA Users ........ 323 8.5.3.6 Summary ............................................................. 323
8.6 Dimensioning of the Iub Interface with HSPA Traffic ........................ 324 8.6.1 Exemplary Architecture of the Iub Interface ........................... 324 8.6.2 Analytical Model of the Iub Interface .................................... 326
8.6.2.1 Blocking (and Loss) Probability .............................. 327 8.6.2.2 Average Throughput ............................................. 327 8.6.2.3 Average Throughput Available for HSDPA Users ..... 329
8.7 Conclusion ................................................................................... 329 References .............................................................................................. 329
8.1 Introduction The increasing popularity of data transfer services in mobile networks of the second and the third generations has been followed by an increasing interest in methods for the dimensioning and optimization of networks servicing multirate traffic. In traffic theory, these issues are in full swing. The problems concern primarily the special conditions of constructing the mobile networks, and the infrastucture of the radio access network-as its development, or extension, needs a precise definition and assessment of clients’ needs and is relatively time-consuming. Cellular network operators define, on the basis of a service level agreement (SLA), a set of key performance indicator (KPI) parameters that serve as determinants in the process of network dimensioning and optimization. Dimensioning can be presented as an unending and ongoing process of analyzing and designing the network. To make this work effective, it is thus necessary to work out algorithms that would, in a reliable way, model the parameters of a designed network.
