Distributed rate control for throughput maximization and QoS support in WCDMA system

We propose a distributed rate control scheme for throughput maximization and different QoS support of each user in the 3GPP WCDMA system using the variable spreading factor of physical channel specification. We focus on the uplink rather than downlink for the reason that the uplink resource is not used effectively by the multiple access. The base station transmits rate command bits and persistence value p considering current load and number of users with each transmission rate. And each mobile station performs the persistence test and changes transmission rate. The performance of the proposed scheme is compared with other conventional methods by simulation. The simulation results show that the proposed scheme has high throughput and supports proper differentiation according to the user´s QoS