An adaptive rate control scheme based on reverse pilot power distribution for CDMA systems

The mechanism of the reverse link (RL) data rate control in a CDMA system is studied, and a new scheme is presented to enhance the efficiency, which is based not only on a probabilistic model, but also on a variable signifying the competitive ability of the mobile station (MS). This variable is related to the distribution of MS´s reverse pilot transmit power, which can reflect its reverse channel quality compared with other MSs in some sense. With this new mechanism, The MS enjoying better channel quality is easier in raising its data transmission rate while the MS undergoing worse channel quality is more likely to reduce its rate. Since MS´s reverse pilot transmit power is a variable known by MS itself, no extra signaling overhead is required from BS. Through dynamic system level simulation for CDMA2000 release D where H-ARQ is employed on RL, the results show that the system throughput on RL is improved by the proposed scheme with the rise over thermal (RoT) value kept on a stable level