System-Level Modeling and Simulation of Uplink WCDMA

Abstract

Universal Mobile Telecommunication System (UMTS) isbased on WCDMA technology. The capacity of this system is difficult to manually compute because of at least two reasons. Firstly, this system is designed to support many types of services, and hence capacity calculation using classic Erlang's capacity is not sufficient. Secondly, the capacity of such system depends on interference which is a time-varying factor, so that it is necessary to precisely model the interference; otherwise the result may be inaccurate. This paper aims to provide complete details of uplink WCDMA modeling and simulation. This proposed simulation is a dynamic system-level simulation in which important parameters such as radio propagation effects, user movement, power control and interference modeling are included. The principles of WCDMA modeling and simulation which are presented in this paper are essential tools for study and research in optimising UMTS system.

Uplink power control modeling for dense OFDMA-based heterogeneous networks

“…Regarding the modeling of uplink power control, previous research has focused on static system analysis or network planning, existing different works that aim to characterize uplink power control mechanisms. For instance, a general model is proposed in [12], while uplink power control schemes used in Wideband Code Division Multiple Access (WCDMA) based systems are studied in [13]. More recently, models for OFDMA-based systems and heterogeneous networks have been also proposed.…”

Performance Evaluation of Soft Handover in WCDMA System

“…Typically in radio channel models, three effects contribute to the loss of a radio link [6]: 1) Path loss attenuation with respect to distance. 2) Shadow fading (slow fading).…”

“…Multipath fading occurs in a situation in which the transmitted signal reaches the receiver over multiple paths. The sum of multipath signal results in fading dips [6][7] [8].…”

“…Assuming balance power control P s1 =P s2 [2]. The total transmit power dedicated to MS under 2-way SHO can be written as: (6) where Pt represents the total required power for the mobile under 2-way SHO.…”

“…Substituting (13) into (6) and (11), the actual transmit power under imperfect power control situation with 2-way SHO and 3-way SHO respectively can be obtained as [12]:…”