A dynamic rate assignment scheme for data traffic in cellular multi-code CDMA networks

By using Gaussian approximation, the optimal number of simultaneous transmissions which maximizes system throughput in multi-code CDMA networks is derived as a function of system parameters including the processing gain, the packet length, and the correctable bit number. Based on this optimal number of simultaneous transmissions and the queue length of each user, a dynamic rate assignment scheme is proposed to support data users with different rate requirements while improving the system resource utilization efficiency. By numerical example the efficiency of the proposed scheme is verified.