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Method for controlling power of enhanced uplink absolute grant channel and subscriber terminal

A technology for accessing allowed channels and enhancing uplink, which is applied to the power control method of enhancing uplink absolute access allowed channels and the field of user terminals, which can solve problems such as not giving power control procedures, and achieve accurate and effective power control

Inactive Publication Date: 2012-07-04
ST ERICSSON SEMICON BEIJING
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  • Description
  • Claims
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Problems solved by technology

[0007] Although 3GPP defines the power control principle of E-AGCH, it does not give a specific power control process

Method used

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  • Method for controlling power of enhanced uplink absolute grant channel and subscriber terminal
  • Method for controlling power of enhanced uplink absolute grant channel and subscriber terminal
  • Method for controlling power of enhanced uplink absolute grant channel and subscriber terminal

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Embodiment Construction

[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] refer to figure 1 , the E-AGCH power control method of the embodiment of the present invention, wherein the following inner loop power control process is performed on the user terminal side:

[0054] Step 101: Demodulate the received E-AGCH, and measure the SNR of the E-AGCH according to the demodulation result;

[0055] The user terminal demodulates the downlink time slot signal where the E-AGCH is located, extracts demodulation symbols belonging to the E-AGCH, and performs SNR measurement according to the demodulation symbols.

[0056] Step 102: Decode the demodulated E-AGCH, and obtain the Resource Persistence Indicator (RDI) carried by the E-AGCH when the decoding is correct;

[0057] When RDI is equal to 0, it indicates that if the use...

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Abstract

The invention provides a method for controlling the power of an enhanced uplink absolute grant channel (E-AGCH) and a subscriber terminal. The method comprises the following steps: demodulating a received E-AGCH and measuring the SNR (signal-to-noise ratio) of the E-AGCH according to the demodulation results; decoding the demodulated E-AGCH and acquiring the RDI (resource duration indicator) carried by the E-AGCH when the E-AGCH is correctly decoded; counting the number Th of the continuously received E-AGCHs until the current sub-frame when the RDI is equal to 0; averaging the Th continuous SNR measured values until the current sub-frame when Th is smaller than the preset threshold, and comparing the average value with the SNR target value to determine the TPC (transmit power control) command word; and predicting the SNR of the following sub-frame according to the Th continuous SNR measured values until the current sub-frame when Th is no smaller than the preset threshold, and comparing the SNR predicted value with the SNR target value to determine the TPC command word. Accordingly, the invention is capable of controlling the power of the E-AGCH more accurately and more effectively.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to an enhanced uplink absolute access grant channel (E-AGCH) power control method and a user terminal. Background technique [0002] In the standard of the third generation partnership (3GPP), in order to support the high-speed uplink packet access (HSUPA) feature, the uplink of the time division synchronous code division multiple access (TD-SCDMA) system has newly added the enhanced uplink dedicated channel (E- DCH). E-DCH is a transmission channel used to carry high-speed uplink data, its transmission time interval (TTI) is 5ms, supports high-order modulation, and layer 1 (L1) hybrid automatic repeat request (HARQ) process, the resources used by it , including power, time slot, code channel, etc., can be scheduled and allocated by the base station (NodeB). [0003] Two control channels are also defined in the uplink: an enhanced uplink control channel (E-UCCH) and an enhanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/12H04W52/14H04W52/24
Inventor 杨文学
Owner ST ERICSSON SEMICON BEIJING
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