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Method and apparatus for inner ring power control

A technology of loop control and transmit power, applied in the field of inner loop power control, can solve the problems of unsatisfactory effect of inner loop control method, low power control efficiency, and large number of air interface messages, so as to reduce the number, improve efficiency, The effect of multiple gains

Inactive Publication Date: 2012-09-05
TD TECH COMM TECH LTD
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Problems solved by technology

And when the Doppler spread is relatively small, the effect of the above-mentioned inner loop control method is not very ideal, and the efficiency of power control is not high. If the step size needs to be changed frequently through RRC messages, it is difficult to achieve timely, and the number of air interface messages will be more

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  • Method and apparatus for inner ring power control
  • Method and apparatus for inner ring power control
  • Method and apparatus for inner ring power control

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Embodiments of the present invention provide a method for inner loop power control. In this method, it can be decided according to the channel Doppler spread whether to use such as figure 2 A method for inner-loop power control with variable step size is shown. For example:

[0030] 1) When the Doppler spread of the channel is less than or equal to a certain threshold (for example, the Doppler spread is 15HZ), the channel coherence time which is inversely proportional to the Doppler spread is greater than the inner loop power control period (for example, 5ms), At this time, the performance of the inner-loop power control method with variable step size is better than that of the inner-loop power control method with fixed step...

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Abstract

An embodiment of the invention discloses an inner ring power control method including: judging whether a Doppler spread is less than or equal to a first Doppler spread threshold; if so, a TPC bit of a variable TPC step is generated and output according to the difference value between the measured value and the target value of SIR, the corresponding relation between the bit value of TPC after spreading and the TPC command and the predetermined difference value threshold of SIR; if not, the TPC bit of a fixed step is generated and output according to the difference value between the measured value and the target value of SIR and the corresponding relation between the bit value of TPC after spreading and the TPC command. An inner ring power control device is also disclosed. The device includes a Doppler spread evaluation module and an inner ring control switching control module. The method and the device can get more gains at a low Doppler spread so as to improve the efficiency of power control, adjust the TPC step in time when the channel environment changes frequently, and reduces the amount of air interface message.

Description

technical field [0001] The invention relates to power control technology, in particular to a method and device for inner loop power control. Background technique [0002] In Time Division Synchronous Code Division Multiple Access (TD-SCDMA, Time Division Synchronous Code Division Multiple Access) mobile communication network, since multiple channels share a frequency band, it is necessary to assign a spreading code to each channel, so that through spreading codes to distinguish between different channels sharing the same frequency band. However, in the actual mobile communication environment, due to the delay caused by channel multipath fading and the influence of wireless signals from other cells, the received signal of the current user will be interfered by its own channel and other channels, and this interference will affect the channel segmentation. , The quality of the received signal is adversely affected. Therefore, when the number of users in the cell increases or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/12H04W52/24
CPCY02B60/50
Inventor 郭伟章小平丁欣
Owner TD TECH COMM TECH LTD
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