Power control loop for a CDMA system
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsKatrina Lau, Graham C. Goodwin
Life of this patent
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Abstract
In a method and a device improved power control for the inner loop of a CDMA system is provided. A model for the power coupling caused by the SIR target inner loop is provided. Hereby a decoupling function for the power coupling caused by the SIR target inner loop can be provided and used when controlling the power in the inner loop.
Claims9
A method of controlling power in the inner loop of a code-division multiple-access (CDMA) radio system, the inner loop being associated with a signal-to-interference ratio (SIR) target, the method comprising:
- determining a mathematical model for power coupling between power control loops for individual CDMA radio system users caused by the SIR target inner loop, wherein the mathematical model is a linear mathematical model or a non-linear mathematical model;
- providing a decoupling function for the power coupling caused by the SIR target inner loop, based on the mathematical model;
- repeatedly calculating the decoupling function;
- and
- controlling power in the inner loop using the decoupling function.
A controller configured to control power in the inner loop of a code-division multiple-access (CDMA) radio system, the inner loop being associated with a signal-to-interference ratio (SIR) target, the controller comprising:
- a module arranged to determine a mathematical model for power coupling between power control loops for the individual CDMA radio system users caused by the SIR target inner loop, wherein the mathematical model is a linear mathematical model or a non-linear mathematical model;
- a module arranged to provide a decoupling function for the power coupling caused by the SIR target inner loop, based on the mathematical model;
- a module arranged to repeatedly calculate the decoupling function;
- and
- a module arranged to control the power in the inner loop using the decoupling function.
A power control module configured to control power in the inner loop of a code-division multiple-access (CDMA) radio system, the inner loop being associated with a signal-to-interference ratio (SIR) target, the power control module comprising a processor and memory circuit configured to:
- determine a mathematical model for power coupling between power control loops for individual CDMA radio system users caused by the SIR target inner loop, wherein the mathematical model is a linear mathematical model or a non-linear mathematical model;
- provide a decoupling function for the power coupling caused by the SIR target inner loop, based on the mathematical model;
- repeatedly calculate the decoupling function;
- and
- control power in the inner loop using the decoupling function.
Dependencies are inferred from the claim text.