Investigation of Outer Loop Power Control Algorithms in TD-SCDMA Systems
Wenbo Wang · Radio Engineering of China · 2006
In 3GPP, the outer loop power control algorithm is not defined, and it is determined by the manufacturers and operators. Due to adopting smart antenna scheme and there being only several users per slot in TD-SCDMA, the outer loop power control algorithm for WCDMA can't be directly available for TD-SCDMA. This paper investigates the outer loop power control algorithms in the TD-SCDMA system, and proposes an advanced outer loop algorithm, which is based on the adaptive power control adjustment step size. Since the parameters related to the outer loop power control algorithms have great impacts on the system performance, the system performances under various parameter' values are presented when the adaptive smart antenna schemes are utilized, which can assist the network planning and optimization for TD-SCDMA systems.