Dynamic feedback method and system for long-term channel state information

A technology of channel state information and dynamic feedback, applied in wireless communication, error prevention/detection using the return channel, electrical components, etc., can solve the problem of unavoidable signaling overhead and achieve the effect of saving feedback overhead

Active Publication Date: 2016-07-06
南通东湖国际商务服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

UE's uplink feedback is necessary, but its signaling overhead is unavoidable. If the signaling overhead can be reduced, precious spectrum resources will undoubtedly be saved

Method used

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  • Dynamic feedback method and system for long-term channel state information
  • Dynamic feedback method and system for long-term channel state information
  • Dynamic feedback method and system for long-term channel state information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This example specifically includes the following steps.

[0055] Step 1. According to the actual situation simulation and test, the difference threshold R0 is obtained; here, the threshold R0 is obtained through the simulation of the actual communication system and related tests, etc., and is mainly used to measure the current long-term CSI and the long-term CSI in use before difference between. This value is an empirical value. Those skilled in the art should understand that the above setting of R0 is easy to implement.

[0056] In step 2, the user equipment (UE) first calculates the chord distance L. There are many specific calculation methods, which can be realized by using existing technologies familiar to those skilled in the art. The chord distance L is the actual difference between the current long-term CSI and the previously used long-term CSI.

[0057] Step 3, assuming that in subframe n 0 The correlation matrix corresponding to the moment is R(n 0 ), the ...

Embodiment 2

[0067] This example specifically includes the following steps.

[0068] Step 1, obtain the threshold R0 according to the actual situation simulation and test; this step is the same as step 1 in the first embodiment;

[0069] Step 2, first calculate the chord distance L at the receiving end (UE), there are many specific calculation methods, which will not be repeated here; this step is the same as step 2 in Embodiment 1;

[0070] Step 3, assuming that in subframe n 0 The correlation matrix corresponding to the moment is R(n 0 ), the correlation matrix corresponding to subframe n time is R(n), and the original codebook at the eNodeB and UE side is PMI. At the time of subframe n, if there is no need to feed back long-term CSI, that is, L0 ) for codebook conversion, that is, R(n 0 )×PMI, that is, only the corresponding PMI needs to be fed back, and the Long-TermCSI is not fed back;

[0071] Step 4. At this time, the information of the 1-bit identification bit on the PUCCH of t...

Embodiment 3

[0077] This example specifically includes the following steps.

[0078] Step 1, obtain the threshold R0 according to the actual situation simulation and test; this step is the same as step 1 in the first embodiment;

[0079] Step 2, first calculate the chord distance L at the receiving end (UE), there are many specific calculation methods, which will not be repeated here; this step is the same as step 2 in Embodiment 1;

[0080] Step 3, assuming that in subframe n 0 The correlation matrix corresponding to the moment is R(n 0 ), the correlation matrix corresponding to subframe n time is R(n), and the original codebook at the eNodeB and UE side is PMI. At the time of subframe n, if there is no need to feed back long-term CSI, that is, L0 ) for codebook conversion, that is, R(n 0 )×PMI, that is, only the corresponding PMI needs to be fed back, and the Long-TermCSI is not fed back;

[0081] Step 4. At this time, the information of the 1-bit identification bit added by the UE o...

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Abstract

The invention discloses a dynamic feedback method of long-term channel state information, including: UE determines whether to feed back long-term CSI to the network side, and notifies the network side of the determination result. The present invention also discloses a dynamic feedback system for long-term channel state information. The system includes a determination unit and a notification unit; the determination unit and the notification unit are set in the UE; The side feeds back the long-term channel state information CSI; the notification unit is configured to notify the network side of the determination result of the determination unit. In the present invention, by comparing the current long-term CSI with the previously used long-term CSI, the long-term CSI is fed back to the network side when the difference exceeds the set threshold; and, when it is determined to feed back the long-term CSI to the network side, the feedback can be flexibly performed, and Can save feedback overhead.

Description

technical field [0001] The present invention relates to the technology of long-term channel state information (Long-Term Channel State Information), in particular to a dynamic feedback method and system of long-term channel state information. Background technique [0002] In the Long Term Evolution (LTE, LongTerm Evolution) system, a base codebook (basecodebook) is shared between the base station (eNB) and the user equipment (UE, UserEquipment), and the UE passes a certain criterion, such as the maximum signal-to-interference-noise ratio (SINR, SignaltoInterferenceplusNoiseRatio ), select an appropriate precoding matrix index (PMI, PrecodingMatrixIndex). The LTE system implements precoding on the eNB side through UE feedback PMI, thereby improving system performance. A basic codebook can be regarded as a single-rank or multiple-rank approximate effective channel option of a group of non-correlated channels. However, these codebooks are designed for specific transmitters, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16
CPCH04W24/10
Inventor 郭森宝孙云锋朱常青
Owner 南通东湖国际商务服务有限公司
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