Inner loop power control method and terminal for high-speed downlink packet access
A technology for accessing terminals and terminals. It is used in transmission control/equalization, power management, sustainable buildings, etc. It can solve problems such as terminal equipment not working properly, path loss changes, signal strength, etc., to ensure inner loop power control. , Simple to implement and the effect of meeting the requirements of HSDPA services
Active Publication Date: 2011-12-07
ST ERICSSON SEMICON BEIJING
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Problems solved by technology
In the downlink of the communication system, the distances between each user terminal equipment and the base station are different. In this way, when the base station transmits the same power to each terminal equipment, the signal received by the terminal equipment closer to the base station will be stronger, and the signal received by the terminal equipment farther away will be stronger. The signal received by the terminal equipment is weak, so that the terminal equipment located at the far end of the base station cannot work normally; moreover, the problem of "shadow effect" is often encountered in the propagation of radio waves, and the position of the mobile terminal in the cell is random and often changes. Therefore, the path loss will vary greatly
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[0030] 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.
[0031] figure 1 and figure 2 Two kinds of timing relationships of HS-SCCH, HS-DSCH and HS-SICH stipulated in the standard are given. The time slot interval between the HS-SCCH and the corresponding HS-SICH is 1 or 2 subframes (excluding the time slots where the HS-SCCH and HS-SICH are located). In the power control process, in order to improve the performance, the power control command word carried by the HS-SICH is determined according to the HS-SCCH channel environment correctly received in the current subframe. However, when the HS-SCCH is not continuously transmitted, or when the terminal demodulates and decodes the HS-SCCH incorrectly, how to generate a power control command word to fill the HS-SICH is not specified in the standard.
[0032...
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The invention provides an internal loop power control method and a terminal used in the High Speed Downlink Packet Access. The method includes: A. setting the terminal into monitor status while starting the HSDPA business; B. while receiving the data of the current sub-frame, if the terminal is being monitored demodulating and decoding each HS-SCCH in sequence, an SINR measurement is carried out for all the HS-SCCH; if one of the HS-SCCH decoding is correct, store the corresponding measurement result as SINR estimate and transfer the terminal into detection status; C. if the terminal is in a detection status, demodulate and decode the former sub-frame with correct decoding; if the decoding is correct, do the SINR measurement for the HS-SCCH and store the corresponding measurement result as SINR estimate; if the decoding is wrong, transfer the terminal into monitor status; D. compare the target and estimate value of the SINR to determine the power control command word. The invention is simple and efficient to control of internal loop power.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an inner loop power control method and a terminal for high-speed downlink packet access (HSDPA). Background technique [0002] In a communication system, transmission power is a precious resource, and the base station sends data to the terminal according to the set transmission power. In the downlink of the communication system, the distances between each user terminal equipment and the base station are different. In this way, when the base station transmits the same power to each terminal equipment, the signal received by the terminal equipment closer to the base station will be stronger, and the signal received by the terminal equipment farther away will be stronger. The signal received by the terminal equipment is weak, so that the terminal equipment located at the far end of the base station cannot work normally; moreover, the problem of "shadow eff...
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IPC IPC(8): H04W52/12H04B7/005
CPCY02B60/50
Inventor 李沛郑大同
Owner ST ERICSSON SEMICON BEIJING