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Method and device for updating TDS outer ring power control signal to noise ratio

A technology of outer loop power control and signal-to-noise ratio, applied in power management, wireless communication, transmission control/equalization, etc., can solve the problem of increasing RNC power control frequency, user power cannot meet communication needs, and reducing TDS frequency stability, etc. question

Active Publication Date: 2014-06-04
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing outer loop power control process, the signal-to-noise ratio adjustment step (including up-step and down-step) is a fixed value. This design has the advantage of easy implementation, but in the real transmission environment In BLER and SNR_Target is not a simple linear relationship, but changes with changes in the environment, so there may be the following problems: If the step size is too large, it may cause the power control range to exceed the required range. If the uplink power of a user is increased too high, so that the BLER far exceeds the required target value, it will cause interference to other users. When it is lowered, the power of the user cannot meet the normal communication needs; If the value is too small, the power adjustment may not be able to keep up with changes in the environment, especially when the transmission environment changes rapidly, it will cause repeated power adjustments, increase the power control frequency of RNC, and reduce the frequency stability of TDS at the same time

Method used

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  • Method and device for updating TDS outer ring power control signal to noise ratio
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  • Method and device for updating TDS outer ring power control signal to noise ratio

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Embodiment 1

[0091] refer to figure 1 , shows a flow chart of the steps of an embodiment of a method for updating the TDS outer loop power control signal-to-noise ratio of the present invention, which may specifically include the following steps:

[0092] Step 101, obtain the current block error rate Present_BLER, the current target signal-to-noise ratio Present_SNR_Target, the current upward adjustment step Present_UpStep, and the current downward adjustment step Present_DownStep;

[0093] In the specific implementation, SNR (Signal to Noise Ratio, signal-to-noise ratio), also known as the signal-to-noise ratio, the higher the value of the signal-to-noise ratio, the smaller the noise, and the higher the anti-interference ability of the device.

[0094] The goal of power control is to ensure that the service quality of the wireless link meets the requirements, and the service quality can be characterized by BLER. In different transmission environments, the corresponding relationship betwe...

Embodiment 2

[0158] refer to image 3 , which shows a structural block diagram of an embodiment of a TDS outer loop power control signal-to-noise ratio update device embodiment of the present invention, which may specifically include the following modules:

[0159] The obtaining module 301 is used to obtain the current block error rate Present_BLER, the current target signal-to-noise ratio Present_SNR_Target, the current upward adjustment step Present_UpStep, and the current downward adjustment step Present_DownStep;

[0160] Judging module 302, used to judge whether the Present_BLER is greater than the preset target block error rate BLER_Target; if so, call the up-regulation module, if not, then call the down-regulation module;

[0161] An upward adjustment module 303, configured to determine the target upward adjustment step UpStep_Target of the target signal-to-noise ratio SNR_Target according to the Present_SNR_Target and Present_UpStep;

[0162] Down-regulation module 304, for determ...

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Abstract

The invention provides a method and device for updating the TDS outer ring power control signal to noise ratio. The method includes the steps of obtaining a Present_BLER, a Present_SNR_Target, a Present_UpStep and a Present_DownStep; judging whether the Present_BLER is larger than a preset BLER_Target; determining the UpStep_Target of an SNR_Target according to the Present_SNR_Target and the Present_UpStep if the Present_BLER is larger than the preset BLER_Target; determining the DownStep_Target of the SNR_Target according to the Present_SNR_Target and the Present_DownStep if the Present_BLER is not larger than the preset BLER_Target; updating the SNR_Target according to the Present_SNR_Target, the UpStep_Target and / or the DownStep_Target. According to the method and device, the SNR_Target can work in a linearity region and is prevented from being too large or small for a long time, an outer ring power control mechanism and an inner ring power control mechanism can be better matched, and wireless link quality fluctuation is reduced.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method for updating the signal-to-noise ratio of TDS outer-loop power control, and a device for updating the signal-to-noise ratio of TDS outer-loop power control. Background technique [0002] In TDS (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access), RNC (Radio Network Controller, radio network controller) according to the BLER (Block Error Ratio, block error rate) statistics of the transmission channel As a result, adjust the increase / decrease of the target SNR Target (Signal Noise Ratio, Signal-to-Noise Ratio). If the adjustment step is fixed, it is easy to cause the phenomenon of SNR Target overadjustment, so that SNR_Target works at a relatively high level for a long time. area. [0003] Closed-loop power control is an important way of power control in TDS. Closed-loop power control can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04W52/12
Inventor 魏亚锋胡乐薇
Owner DATANG MOBILE COMM EQUIP CO LTD
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