Rate and power adaptation for downlink shared channel in WCDMA

Rate adaptation scheduling with prioritized call admission control for UMTS WCDMA networks is analyzed. Admission is based on maximum base station transmit power and service class priority. Conversational and interactive services are considered. Real Time services with stringent QoS requirements are operated in circuit switched mode over the dedicated radio bearers. Downlink shared channels are used to transport Non Real Time data handled in packet switched mode. Rate adaptation based upon link quality for NRT services and system load is introduced to improve performance and increase capacity. Results indicate that rate adaptation scheduling uses radio resource efficiently and improves system stability. Compared with fixed rate scheduling, rate adaptation scheduling results in better overall QoS.