Study on Dedicated Channel (DCH) enhancements for UMTS
The present document captures design options, evaluation results and analysis from the study item on "DCH enhancements for UMTS" described in [2].
The work under this study intends to capture the merits and feasibility of DCH Enhancements in terms of the reduction in the average required power per user on the downlink and the average RoT consumed on the uplink. An evaluation of the increase in UE data throughput in a mixed voice-data traffic scenario when DCH enhancements were applied is also conducted.
The following enhancements are considered in the study:
• DL Physical Layer Enhancements
◦ DL DPCCH Slot Format Optimization
◦ DL DPDCH Frame Early Termination
◦ DL ACK Indicator design for UL FET
◦ DPCH Time Domain Multiplexing
◦ Reduced power control rate schemes
◦ Node B DTX/UE DRX Mechanisms
• UL Physical Layer Enhancements
◦ UL DPCCH Slot Format Optimization
◦ UL Frame Early Termination
◦ UL ACK Indication for DL Frame Early Termination
◦ DTCH/DCCH time compression
◦ Reduced power control rate schemes
◦ UE DTX/Node B DRX mechanisms
Additionally, the following aspects are also investigated:
• UE Power Consumption Efficiency
• Impact on Network implementation
• Impact on UE implementation
• Impact on specifications