No abstract

In this paper, we cover some radio dimensioning aspects for the downlink in WCDMA systems. Capacity and coverage estimation is conducted in a multiservice context, based on an analytical expression for the total power of the base-station. A definition for the multiservice downlink cell loading is introduced which allows a characterization of downlink multiservice capacity. Influence on the capacity of the traffic mix or of some key parameters like the non-orthogonality factor, soft handover rate, or the portion of power dedicated to broadcast channels is analysed. A downlink-specific link budget is also established, accounting for the mix of traffic in the cell. In this context, a comprehensive downlink dimensioning framework is set up. 0-7803-7005-8/01/$10.00 0 2001 IEEE

This paper intends to give a detailed analysis of the downlink performance in a CDMA system, more precisely for the radio interface of the W-CDMA. This analysis will allow to treat capacity and coverage issues in a formal way, as well as to identify key parameters specific of the CDMA technology, leading to a better understanding of the performances of the downlink. An expression for downlink cell load will be derived, allowing an analytical approach towards dimensioning.

In this paper, we address the issue of the multiservice circuit demand modeling in the radio dimensioning process for 3G/IMT-2000 systems. An extension of the Erlang B/C law to multi-service is exposed and applied to the UMTS dimensioning process. The multi-service Erlang law relies on joint blocking probability calculations. This new method is compared to existing ones, which are based on individual service treatment. The multi-service Erlang law exhibits a significant reduction in required bandwidths, due to the sharing of resources among the different services. However, this bandwidth reduction is very dependent on the traffic mix. The impact on the cell count in various cases has also been investigated, using Telemate's dimensioning tool, NDTTM. It has been observed that the dimensioning results are greatly affected by the multi-service management in the demand modeling.

Io this paper, we address the issue of multiservice packet demand modeling in the radio dimensioning process for 3GnMT-2000 systems. For packet services, Quality of Service (QoS) is measured as a time delay over the radio interface. New tables stemming from simulations are proposed to convert the volume of packet data expressed in Mhits into a required pipe respecting the QoS. The mix of packet services with different QoS requirements and the mix of circuit and packet services are also addressed. This new demand modeling scheme has been implemented in Orange Support & Consulting's dimensioning tool, ndtTM and compared to the results of Orange Support & Consulting's UTRA simulation tool.