Uplink synchronous WCDMA combined with variable modulation and coding
ABSTRACT Previous studies show a high potential capacity gain for uplink synchronous WCDMA systems in low dispersive environments when users in the same cell are separated by orthogonal codes. However, the number of available orthogonal codes tends to limit the capacity gain of this scheme. In this paper, variable modulation and coding is introduced as a solution to improve the channelization code utilization per user equipment and thereby increase the capacity of uplink synchronous WCDMA. The radio resource management algorithms to support this scheme are presented. Theoretical and simulation results on the capacity gain of uplink synchronous WCDMA combined with variable modulation and coding are presented. A 29% capacity gain is obtained for a pedestrian micro-cell environment.
Conference Paper: Multi-cell admission control for UMTS[Show abstract] [Hide abstract]
ABSTRACT: Power-based multi-cell admission control is assessed as a solution to avoid unstable situations and to increase the system capacity in WCDMA networks, which are intended to provide high-speed data services. This paper proposes and analyses an uplink multi-cell admission control algorithm, which takes the interference level in the adjacent cells as well as in the serving one into account. Power increase estimation is crucial when performing power-based admission control tasks. With the aim of making the realisation of the multi-cell admission control algorithm possible, a method is derived to estimate the received power increase which a new mobile station generates in the adjacent base stations. Simulation results reveal that under non-homogeneous conditions the new algorithm provides a 34% capacity gain for a 5% of dropping connection probabilityVehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd; 02/2001
- 1st edited by Harri Holma, Antti Toskala, 06/2000; John Wiley & Sons., ISBN: 0471720518, 978-0471720515
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ABSTRACT: Simulation and modelling of the orthogonality factor (OF) in urban environments is considered. OF is one of the factors affecting the performance of the forward link in W-CDMA systems. The correlation between the OF and the RMS delay spread in microcellular conditions and LOS propagation is investigatedElectronics Letters 04/2001; · 1.07 Impact Factor