Consecutive transmit power control ratio aided adaptive power control for UMTS

Abstract

The proposed algorithm adjusts its power control step size based on a new parameter called consecutive transmit power control ratio. Simulations of the proposed algorithm show that it outperforms fixed-step algorithms without any requirements for additional knowledge such as Doppler estimations.

Mobile Station Position Estimation using Remote Radio Head with Adaptive Power Control

“…Kim et al [8] Patachaianand and Sandrasegaran [4] compared performances of the AS-CLPC, BA-CLPC, SA-CLPC, and M-ACLPC in terms of PCE (Power Control Error) under the same simulation environment. In their comparisons, the AS-CLPC showed the best performance when the MS speed was lower than 25 km/h, while the SA-CLPC was the best when the speed was greater than 25 km/h.…”

“…In their comparisons, the AS-CLPC showed the best performance when the MS speed was lower than 25 km/h, while the SA-CLPC was the best when the speed was greater than 25 km/h. Patachaianand and Sandrasegaran [4] presented the CS-CLPC (Consecutive TPC Ratio (CTR)…”

“…Conventional SIR estimates [3,4] consider only the transmission power and the link-gain, and a CTR (Consecutive Transmit-Power-Control Ratio) is introduced for speed estimation in Ref. [5] because a faster mobile is likely to receive more CTR than a DA VID PUBLISHING D Mobile Station Position Estimation using Remote Radio Head with Adaptive Power Control 14 slower one.…”

An adjustable fuzzy power control architecture for a multi-rate WCDMA system

“…Comparing with the conventional SPC algorithm, the combined method had the better outage performance. In [7], [8], the power control mechanisms with adaptive step size were proposed to limit the oscillation around the target SIR. The above methods with fuzzy systems, however, did not automatically adjust the membership function within the fuzzy systems.…”