Method and apparatus for sending channel quality indication

A technology of channel quality indication and quality indication, which is applied in the direction of using the return channel for error prevention/detection, digital transmission system, electrical components, etc. It can solve the problems of not supporting 256QAM, etc., and achieve the effect of improving system throughput

Active Publication Date: 2012-08-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant implementation method for the modulation and coding mode supporting 256QAM in the prior art

Method used

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  • Method and apparatus for sending channel quality indication
  • Method and apparatus for sending channel quality indication

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] figure 1 In the embodiment of the present invention, the user equipment receives the pilot signal sent by the base station, and uses the CQI of several bits more than the original system to feed back the channel quality to the base station, and the base station selects an appropriate modulation and coding method according to the channel quality indication, and sends data the process of.

[0068] As shown in Table 4, 1 bit is added on the basis of the original 4-bit CQI indication of the system to indicate the newly added 2-level CQI. This 2-level CQI is used to indicate the modulation method of 256QAM, as shown in the CQI Index in Table 4 16 and CQI Index 17. The increased CQI is indicated with 5 bits.

[0069] The base station sends a pilot signal to the user equipment, and the user equipment receives the pilot signal and feeds back a channel quality indicator to the base station: for example, the CQI index fed back by the user equipment is 16, which means that the m...

Embodiment 2

[0073] figure 2 In the embodiment of the present invention, the user equipment receives the pilot signal sent by the base station, and uses the CQI of several bits more than the original system to feed back the channel quality to the base station, and the base station selects an appropriate modulation and coding method according to the channel quality indication, and sends data the process of.

[0074] As shown in Table 5, on the basis of the 4-bit CQI indication of the original system, 1 bit is added to indicate the newly added 3-level CQI. This 3-level CQI is used to indicate the modulation method of 256QAM, such as CQI Index 16, CQI Index 17 and CQI Index 18. The increased CQI is indicated with 5 bits.

[0075] The base station sends a pilot signal to the user equipment, and the user equipment receives the pilot signal and feeds back a channel quality indicator to the base station: for example, the CQI index fed back by the user equipment is equal to 18, which means that...

Embodiment 3

[0080] image 3 In the embodiment of the present invention, the user equipment receives the pilot signal sent by the base station, uses the same number of CQI bits as the original system to feed back the channel quality to the base station, and the base station re-interprets the content of the CQI indication according to the channel quality indication, and selects an appropriate Modulation and encoding method, the process of sending data.

[0081] When the base station sends a pilot signal to the user equipment, the user equipment receives the pilot signal and feeds back the channel quality indication to the base station: at this time, the base station uses the CQI Index indicated in Table 2 to reinterpret the content of the CQI indication.

[0082] For example, the CQI Index fed back by the user equipment is equal to 14, which means in the original system that the modulation mode applicable to the current downlink is 64QAM, and the code rate is about 873 / 1024. At this time, ...

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Abstract

The invention provides a method for sending channel quality indication. The method comprises that: channel quality indication supporting a 256 quadrature amplitude modulation (QAM) mode is newly increased; and user equipment receives a pilot signal sent by a base station, carries out channel measurement according to the pilot signal and feedbacks current channel quality indication to the base station. Besides, provided is an apparatus for sending channel quality indication. According to the invention, a 256 QAM modulation mode is supported and the system throughput is improved.

Description

technical field [0001] The present invention relates to a mobile communication system, in particular to a method and device for sending channel quality indication. Background technique [0002] In the mobile communication system, due to the time-varying characteristics of the wireless fading channel, there are a lot of uncertainties in the communication process. In this way, when the signal-to-noise ratio of the wireless fading channel is relatively ideal, the system throughput has indeed been greatly improved, but when the channel is in deep fading, it cannot guarantee reliable and stable communication. On the other hand, in order to ensure the reliability of communication , using low-order modulation with a low transmission rate and large redundant error-correcting codes for communication, that is, to ensure reliable and stable communication when the wireless channel is in deep fading. However, when the channel signal-to-noise ratio is high, due to the low transmission rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04L1/00H04L27/34
Inventor 张帅许进徐俊
Owner ZTE CORP
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