Method and its system for controlling soft switching link power in CDMA network

Abstract

The invention relates to code division multiple access technology, and discloses a method and system for controlling soft handover link power in a code division multiple access network, so that user terminals can effectively reduce downlink interference when performing soft handover. In the present invention, by monitoring the downlink code domain transmission power of all soft handover branches of the user terminal and the uplink received signal to interference ratio, the downlink code domain transmission power of the branch with the largest signal to interference ratio is obtained in real time, and this is used as a reference value , turn off the downlink transmission of those soft handover branches whose downlink code domain transmission power is relatively large but has little effect on improving the downlink performance, and maintain the uplink reception of these branches to ensure that the uplink reception performance is not affected. If the optimal cell where the branch with the largest signal-to-interference ratio is located changes and the downlink transmission of the cell is turned off, start the transmission of the changed optimal cell, and at the same time use the initial downlink transmission of the branch with the largest signal-to-interference ratio after the change The transmit power in the code domain is a reference value.

Description

technical field [0001] The invention relates to the code division multiple access technology, in particular to the technology for controlling the soft switching link power in the code division multiple access network. Background technique [0002] In the past 20 years, the development of mobile communication technology has gone through two generations, from the first generation of analog cellular communication technology to the second generation of Global System for Mobile Communications (Global System for Mobile Communications, referred to as "GSM") and Code Division Multiple Access (Code Division Multiple Access, referred to as "CDMA") represents the transition of digital communication technology. Now it is developing towards the third generation mobile communication system (Third Generation Mobile Communications System, referred to as "3G"). Among them, the main standard of 3G will be unified in CDMA technology. [0003] CDMA technology refers to a plurality of user ter...

AI Technical Summary

Problems solved by technology

[0015] One situation is that the soft handover branch with poor propagation environment is allocated the same transmit power as the soft handover branch with good propagation environment, but the allocated downlink transmit power cannot effectively improve the downlink reception performance, but increases the system interference

[0016] Another situation is that the uplink and downlink load of a cell where a soft handover branch is located is relatively heavy, and allocating more power to the soft handover branch will further increase the load of the cell

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