A capacity-optimal QoS provisioning scheme for multimedia traffic in CDMA networks

We study the transmission rate (R) and bit-energy-to-interference ratio (E_b/I₀) needed to maintain the desired QoS requirement for a given traffic while maximizing the user capacity in multimedia CDMA networks. Closed form functions among transmission rate, bit error rate (or equivalently E_b/I₀), QoS requirements, and traffic characteristics are derived. Based on the dependence between R and E_b/I₀, we propose a capacity-optimal determination of (R, E_b/I₀) for a given traffic and QoS requirement. By numerical example we show that a higher user capacity is achieved by our scheme compared to those which ignore the dependence between R and E_b/I₀.