E-HICH (enhanced hybrid automatic repeat request indicator channel) downlink power control method

A technology of power control and transmission power, applied in the field of downlink power control of E-HICH

Inactive Publication Date: 2013-02-13
TD TECH COMM TECH LTD
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Problems solved by technology

Whether it is a scheduled E-HICH or a non-scheduled E-HICH, the same subframe usually carries the signals of multiple UEs, but currently, no downlink power control (DLPC) is applied to the two types of E-HICH to Control the transmission power of each UE signal carried on the E-HICH, but each UE's signal equally divides the transmission power of the E-HICH

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  • E-HICH (enhanced hybrid automatic repeat request indicator channel) downlink power control method
  • E-HICH (enhanced hybrid automatic repeat request indicator channel) downlink power control method
  • E-HICH (enhanced hybrid automatic repeat request indicator channel) downlink power control method

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Embodiment Construction

[0027] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] E-HICH is a special downlink channel, and the transmission power of the MIDAMBLE domain of this channel is equal to the sum of the transmission powers of all UE signals carried on the E-HICH. Because the power of the MIDAMBLE domain directly determines the performance of channel estimation, the increase or decrease of the MIDAMBLE power will affect the demodulation performance of all UEs on the E-HICH. Usually, the channel estimation performance is allowed to vary within a certain range, and the demodulation performance of the UE can be guaranteed through a reasonable demodulation algorithm. However, when the channel estimation performance deteriorates to a certain extent, the demodulation performance of the UE will be severely degraded, so that the expected ...

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Abstract

The invention discloses an E-HICH (enhanced hybrid automatic repeat request indicator channel) downlink power control method, comprising the following steps: UE (user equipment) calculates signal to noise ratio (SNR) of the current E-HICH subframe, the SNR is compared with the target SNR to determine a TPC (transmit power control) command, and the command is fed back to a Node B; after the Node B receives the fed-back TPC command, the Node B judges whether the information channel estimated performance is affected after the E-HICH power is adjusted according to the fed-back TPC command; if not, the E-HICH power is adjusted according to the TPC command; and if yes, the E-HICH power is further adjusted on the basis of the TPC command, so as to ensure the adjusted E-HICH power not to affect the information channel estimated performance. By adopting the invention, the E-HICH downlink power control can be realized, and the influence of E-HICH power change on the information channel estimated performance can be effectively avoided.

Description

technical field [0001] The present invention relates to high-speed uplink packet access (HSUPA) technology, in particular to a downlink power control method of E-HICH. Background technique [0002] At present, in the configuration of HSUPA, usually each carrier needs to support one E-HICH of scheduling type and one E-HICH of non-scheduling type. Whether it is a scheduled E-HICH or a non-scheduled E-HICH, the same subframe usually carries signals of multiple UEs, but currently, no downlink power control (DLPC) is applied to the two types of E-HICH to The transmission power of each UE signal carried on the E-HICH is controlled, but each UE signal equally divides the transmission power of the E-HICH. Contents of the invention [0003] In view of this, the present invention provides an E-HICH downlink power control method, which can reasonably control the transmission power of each UE signal carried on the E-HICH. [0004] To achieve the above object, the present invention a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/14H04B7/005
CPCY02B60/50
Inventor 魏立梅赵渊沈东栋
Owner TD TECH COMM TECH LTD
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