Patent ID: 7660600

Claim:
A method of downlink outer loop transmission power control having a settling state, a transient state and a steady state, comprising: during the settling state: initializing a steady state step size parameter and a transient state step size parameter, and converging a measured signal to interference ratio (SIR) to an initial target signal to interference (SIR) using an inner loop power control; during the transient state: for each transmission time interval (TTI), setting a transient state step down parameter based on a target block error rate parameter and a transient state step size parameter, and setting a transient state step up parameter based on the transient state step down parameter and a transient state step size parameter, where the transient state step down parameter and the transient state step up parameter are used for adjusting the target SIR; adjusting the transient state step size parameter by half upon detection of an error during a TTI; and increasing the target SIR if an error is detected and decreasing the target SIR if no error is detected and the transient state step size is greater than the steady state step size; during the steady state: for each TTI, decreasing the target SIR by a steady state step down parameter if no error is detected and increasing the target SIR if an error is detected; and increasing the steady state step down parameter if no error is detected within an observation period of multiple TTIs.