Dynamic rate and power adaptation under multiple SIR constraints in cellular VSF WCDMA networks

A novel dynamic joint rate and power adaptation framework is proposed for downlink data transmission in a multi-cell variable spreading factor (VSF) WCDMA system where the different classes of users have different signal-to-interference ratio (SIR) requirements. Based on a general downlink SIR model, the problem of optimal dynamic rate and power adaptation under multiple SIR constraints is also formulated, for which the rate and power allocation can be found by an exhaustive search. Performance of the dynamic joint rate and power adaptation under the proposed framework is evaluated under random micro-mobility model with uncorrelated long-term fading and a directional micro-mobility model with correlated long-term fading in a cellular WCDMA environment for both the homogeneous (or uniform) and the non-homogeneous (or non-uniform) traffic load scenarios.