Dynamic effects of power control on third-generation system capacity
R.E. Kamel, Martin H. Meyers, Susan Wu Sanders, Carl F. Weaver · Bell Labs Technical Journal · 2003
Dynamic simulations with mobility in multi-pilot environments have been developed to assess the capacity advantages of third-generation (3G) 800 Hz forward link power control. We show that the key component of 3G power control is not the higher inner loop power control speed but the creation of a bit energy-to-noise density (Eb/Nt) setpoint-based power control loop that provides a target for the inner loop power control. This allows fast tracking of the dynamic geometry variations, including the large instantaneous changes due to handoff as well as other-cell interference, and provides significant additional capacity gains even at vehicular speeds where Rayleigh fading cannot be tracked. Three different simulation tools, at the chip, symbol, and power control group (PCG) level, all confirm the excellent performance of 3G power control, as well as the existence of additional forward link capacity with 3G power control. Although our specific examples are based on CDMA2000∗, similar conclusions apply to the forward link power control algorithms used in wideband code division multiple access (W-CDMA).