A method for adjusting multi-cell downlink power control

Abstract

The present information discloses a method for adjusting multi-cell downlink power control, which includes the following steps of: (1) in the process of soft switch, monitoring the difference between the downlink transmission power and the preset referential power of a wireless link and the contraction coefficient thereof in software switch activation set; (2) deciding the accumulated value of power adjustment according to the difference and the contraction coefficient; (3) executing power accessory adjustment on the basis of power control if the accumulated value is above the preset threshold. The method of the invention, through the adjustment to contraction of the transmission power of the base stations to the preset referential power under soft switch, avoids too much deviation of thedownlink transmission power of the wireless links of the same terminal, thus ensuring software switch and gaining, lowering downlink disturbance, and lowering dropping rate.

Description

technical field [0001] The invention relates to a power control method of a mobile communication system, in particular to the design of a multi-cell downlink power control method in soft handover in the mobile communication field. Background technique [0002] With its unique advantages of flexibility and convenience, mobile communication meets people's requirements for communication technology in modern society, and has become the fastest-growing communication method since the mid-1980s. And CDMA (Code Division Multiple Access, Code Division Multiple Access), the technology is the "darling" of mobile communication, in just a few years time, has obtained a huge breakthrough in technology. Soft handover is one of the key technologies of CDMA system, which has been successfully applied to IS95 and CDMA2000 systems, and adopted by the third generation mobile communication system. [0003] Soft switching is unique to CDMA systems. The basic principle is as follows, when the mo...

AI Technical Summary

Problems solved by technology

However, in the actual wireless propagation environment, due to the path loss and fading experienced by the wireless links connecting each base station are different, and the power control command cannot guarantee completely error-free transmission in the actual wireless environment, it will lead to different The adjustment direction and step of the downlink wireless link that the terminal is connected to are inconsistent, or even completely deviate from the adjustment, which will cause the quality of the downlink wireless link connected to the terminal to become worse and worse, and eventually break out of soft handover activation set, and even affect the overall quality of link merging, resulting in more important quality problems such as abnormal call drop

[0006] like figure 1 As shown, the adjustment direction of the transmit power of base station 1 and base station 2 for the same terminal deviates. Base station 1 increases the transmit power, and base station 2 decreases the transmit power, thus weakening the wireless link of base station 2 in the active set, resulting in soft combining gain decline

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