Forward power control method for CDMA system

Abstract

The present invention discloses a forward power control method in CDMA system, descent stepsize of forward transmission power has been set in advance using the said method, and performing the following step: starting a clearing-zero timer of frame amount counter; waiting for Power Measurement Report Message (PMRM) transmitted by Mobile Station (MS) during timing, and calculating raise stepsize in accordance with the PMRM transmitted by MS and the descent stepsize set in advance if the MS has transmitted the PMRM, then improving forward transmission power in accordance with calculated raise stepsize, and restarting the clearing-zero timer of frame amount counter; reducing forward transmission power in accordance with set descent stepsize if the clearing-zero timer of frame amount counter is overtime, and restarting the clearing-zero timer of frame amount counter. According to the method of the present invention, the size of raise stepsize can be changed in accordance with measurement report and relevant parameters, realizing rapid and exact adjustment of the forward transmission power to ensure the convergence of forward power and frame error ratio (FER).

Description

technical field [0001] The invention relates to a power control method of a code division multiple access system, in particular to a forward power control method of the code division multiple access system. Background technique [0002] Radio resource management in a system based on Code Division Multiple Access (CDMA for short) includes several aspects such as power management, mobility management, load management, and channel allocation. Among them, power management is a very important link, because power is the ultimate wireless resource in a CDMA system, so the only way to use wireless resources most effectively is to strictly control the use of power. [0003] In the power management part, on the one hand, increasing the transmit power for a certain user can improve the user's service quality; on the other hand, due to the self-interference of the CDMA system. Because CDMA uses spread spectrum technology, all signals share the same frequency spectrum, and the signal en...

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Problems solved by technology

[0015] In practical applications, the above solutions have the following problems: the existing technical solutions cannot quickly and stably adjust the forward power according to the frame quality, and cannot guarantee the convergence of the forward power and FER

[0016] The main reason for this situation is that, on the one hand, the physical meaning of waiting for the measurement report timer duration in the prior art scheme is not clear, and has no cooperation relationship with the total number of frames counter on the mobile station side, so it is impossible to know the counter on the mobile station side Cleared information; on the other hand, in the existing technical solutions, the ascending and descending steps are fixed, and cannot be adjusted according to the total number of frames in the measurement report, and the power is only determined according to the FER in the PMRM, such as When the total number of frames is 2 and the number of errored frames is 2, the algorithm decides to increase by one step. When the total number of frames is 100 and the number of errored frames is 2, the algorithm also decides to increase by the same step, so that the forward power adjustment Either it is not timely, or fluctuates violently; in addition, the ascending step and descending step are set separately, so that there is no mutual restriction between the ascending and descending step and the target FER. If the configuration is improper, the power will not converge

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