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Downlink power control method and user equipment

A technology of power control and user equipment, applied in the field of communication, can solve the problem of no downlink power control method, etc., and achieve the effect of fast adjustment

Active Publication Date: 2014-12-17
ST ERICSSON SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) system, there is no feasible downlink power control method to suppress the floor effect of the target signal-to-noise ratio

Method used

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  • Downlink power control method and user equipment
  • Downlink power control method and user equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Please refer to figure 2 , figure 2 It is a schematic flowchart of a downlink power control method according to Embodiment 1 of the present invention, the method includes an inner loop power control step and an outer loop power control step, and the inner loop power control step includes:

[0057] Step 201, obtaining signal-to-noise ratio information of a received signal;

[0058] The signal-to-noise ratio information may include: the signal-to-noise ratio value of the currently received subframe, or the predicted value of the signal-to-noise ratio of the next subframe.

[0059] Step 202, obtaining a cyclic redundancy check result of the received signal;

[0060] Step 203, when the result of the cyclic redundancy check indicates that the cyclic redundancy check passes and the signal-to-noise ratio information is greater than a preset threshold, generate a first transmission power control instruction for controlling the base station to reduce transmission power;

[...

Embodiment 2

[0082] Please refer to image 3 , image 3 It is a schematic flowchart of a downlink power control method according to Embodiment 2 of the present invention, and the method includes:

[0083] Outer loop power control step 301, adjusting the signal-to-noise ratio target value according to the channel decoding result of the received signal;

[0084] Wherein, the channel decoding result may be a CRC check result or a BLER.

[0085] Inner loop power control step 302, step 302 comprises again:

[0086] Step 3021, acquire the predicted value of the signal-to-noise ratio of the next subframe.

[0087] Step 3022, judging whether the predicted signal-to-noise ratio of the next subframe is greater than the preset threshold defined by the actual service, if yes, execute step 3023, otherwise, execute step 3027;

[0088] Step 3023, obtain the CRC check code of each transmission block in the previous IIT;

[0089] Step 3024, judging whether the CRC check codes of each transmission bloc...

Embodiment 3

[0102] Please refer to Figure 4 , Figure 4 It is a schematic structural diagram of a user equipment according to Embodiment 3 of the present invention. The user equipment includes an inner loop power control module 400, and the inner loop power control module 400 includes:

[0103] The first acquiring module 401 is configured to acquire signal-to-noise ratio information of the received signal.

[0104] The second obtaining module 402 is configured to obtain a cyclic redundancy check result of the received signal.

[0105] The first instruction generation module 403 is configured to generate a first transmission power for controlling the base station to reduce transmission power when the cyclic redundancy check result indicates that the cyclic redundancy check passes and the signal-to-noise ratio information is greater than a preset threshold Control instruction.

[0106] The first sending module 404 is configured to send the first transmit power control instruction to the...

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Abstract

The invention provides a downlink power control method and user equipment. The downlink power control method comprises an inner loop power control step, wherein the inner loop power control step comprises the following steps of obtaining signal to noise ratio information of a receiving signal; obtaining a cyclic redundancy check result of the receiving signal; when the cyclic redundancy check result shows that the cyclic redundancy check passes and the signal to noise ratio information is greater than a preset threshold, generating a first transmitting power control command for controlling a base station to reduce the transmitting power; and transmitting the first transmitting power control command to the base station. According to the downlink power control method and the user equipment, the floor effect of a signal to noise ratio target value of UE (User Equipment) can be effectively inhibited.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a downlink power control method and user equipment. Background technique [0002] In a weak signal scenario, for example, when a UE (User Equipment, user equipment) moves to the edge of a cell, if the UE performs downlink power control, its SNR target value will continue to increase, and even reach its maximum value (at this time, the base station's transmit power at maximum level). Once the signal becomes better, for example, when the UE moves towards the base station, the base station needs to send many subframes to the UE to restore the UE's SNR target value to a normal level. In these subframes, the transmission power of the base station will be much larger than normal, which will cause strong interference to other UEs working in the same cell. This phenomenon is called SIRtarget wind up effect. [0003] At present, for TD-SCDMA (Time Division-Synchronous Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/14H04W52/12
Inventor 黄珍庄亮
Owner ST ERICSSON SA
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