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Method for performing power control from channel quality indication

A technology of channel quality indication and power control, applied in the direction of transmission control/equalization, shaping network in transmitter/receiver, baseband system components, etc., can solve the problems of dedicated channel quality degradation and ensure reliability Effect

Inactive Publication Date: 2007-12-05
ZTE CORP
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Problems solved by technology

When a similar power control method is adopted for some non-dedicated channels, some problems will occur. For example, the HS-SCCH channel in the HSDPA system does not have soft handover, but the dedicated channel has soft handover, that is to say, in the handover When the UE (User Equipment, communication terminal device) communicates with two or more base stations on a dedicated channel, and at the same time, the UE only communicates with one base station on the HS-SCCH channel, if the HS-SCCH channel uses the same channel as the dedicated channel If the power control algorithm is used, the quality of the dedicated channel that belongs to the same wireless link as the HS-SCCH may decrease, resulting in an increase in the HS-SCCH block error rate (BLER, Block Error Ratio)

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  • Method for performing power control from channel quality indication
  • Method for performing power control from channel quality indication
  • Method for performing power control from channel quality indication

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Referring to FIG. 1, it is a schematic flowchart of a method for power control by channel quality indication described in an embodiment of the present invention, and the specific process is as follows:

[0018] Step 110: Determine the despread SNR of the data channel according to the channel quality indication fed back from the uplink channel;

[0019] Step 120: Obtain the SNR of the data channel before despreading from the relationship between the SNR of the data channel before despreading and after despreading;

[0020] Step 130: Obtain the SNR of the pilot channel from the relationship between the SNR of the data channel before despreading and the SNR of the pilot channel;

[0021] Step 140: Obtain the signal-to-noise ratio of the target channel from the relationship between the power of the target channel and the power of the pilot channel;

[0022] Step 1...

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Abstract

The invention publishes a method on power control by the channel quality, which includes: obtain signal-to-noise ratio according to the quality of upward channel feedback channel; obtain signal-to-noise ratio of before de-spread according to the signal-to-noise ratio's relations between the signal before de-spread and the signal after de-spread; obtain signal-to-noise ratio of pilot frequency channel according to relation between the signal before de-spread and the goal channel's power. After carrying on simulation to this goal channel, obtain the target value of satisfy signal-to-noise ratio; obtain goal channel's power according to the relation between signal-to-noise ratio and target value of the goal channel. This method improves the channel's transmission quality to ensure the transmission reliability.

Description

technical field [0001] The present invention relates to a method of power control, in particular to a method of power control by Channel Quality Indicator (CQI), which is used in HSDPA (High Speed ​​Downlink Packet Access, High Speed ​​Downlink Packet Access) system. Background technique [0002] Power control is one of the most important technologies in the mobile communication system, through which the quality of the received signal can be improved, thereby improving the reliability of the wireless link. At the same time, the traditional CDMA communication system is a self-interference system. The unnecessary power will increase the interference of the link and reduce the capacity and throughput of the cell. Therefore, a good power control algorithm is very useful for the mobile communication system. beneficial. In the field of mobile communication, it has been suggested that multiple communication terminals share a high-speed and large-capacity downlink channel. The HSDP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04L25/03
Inventor 刘涛
Owner ZTE CORP
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