Techreport,
Performance Comparison of HSDPA Transmit Power Allocation Schemes in UMTS Networks.
Technical Report, 411. Department of Computer Science, (April 2007)
Abstract
In UMTS networks the transmit power for the HSDPA can be a large
fraction of the total transmit power of a NodeB. We investigate the
impact of three HSDPA transmit power allocation schemes on the
performance of a UMTS system with dedicated channel users and HSDPA
users. The continuous HSDPA power allocation scheme avoids large steps
in power to prevent irregularities in the downlink power control of
dedicated channels. In contrast, the traffic-aware scheme switches the
HSDPA power on only if data has to be transmitted. The power-ramping
scheme combines the continuous and the traffic-aware scheme. The
simulation model considers the complete interference situation in the
network and uses a novel model to calculate HSDPA bandwidths. The
results suggest that the additional interference caused by the
continuous scheme leads to performance losses, while the power-ramping
scheme shows results close to the traffic-aware scheme.
