qos-driven power control for downlink multiuser communications over parallel fading channels in mobile wireless networks
We propose a power adaptation scheme for downlink multiuser communications over parallel fading channels in mobile wireless networks. This model can be applied to the case of time division or frequency division downlink transmission over broadcast channels in cellular networks. Specifically, our proposed scheme aims at optimizing the sum of the weighted effective capacity over all users each with a specified statistical delay quality of services (QoS) constraint, called QoS exponent. Using a two-step method, we derive the optimal power adaptation policy for the above problem. Numerical evaluations are also presented to investigate the impact of the delay QoS on optimizing the weighted sum effective capacity and that on the power allocation across different users.
wireless networks optimization effective capacity resource allocation multiuser downlink communications