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Method and device for channel state information feedback

A technology for channel state information and information feedback, which is applied in the direction of signaling, digital transmission system, and transmission data organization to avoid errors. Information and other issues to ensure normal work, normal feedback, and normality

Active Publication Date: 2015-09-16
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since in LTE-A, two precoding indicators i1 and i2 need to be fed back, this makes the channel state information feedback method of only transmitting one PMI value in the PUCCH channel in the LTE system, specifically involving the calculation of CQI information and PMI information The method cannot be applied to the new technical requirements in LTE-A
However, in the prior art, there is no implementation scheme for how to calculate CQI information and PMI information in feedback channel state information in the LTE-A system

Method used

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  • Method and device for channel state information feedback
  • Method and device for channel state information feedback
  • Method and device for channel state information feedback

Examples

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Effect test

Embodiment 1

[0131] Embodiment 1, assuming that in the LTE-A communication system, channel state information is periodically fed back on the PUCCH, such as figure 1 As shown, when the feedback mode 1-1 is adopted and RI and i1 are jointly coded, the channel state information fed back by the UE includes RI information, i1 information, i2 information and CQI information.

[0132] In Embodiment 1, RI information and i1 information are jointly coded and transmitted in the same subframe with a relatively long period; CQI information and i2 information are transmitted in another subframe with a relatively short period. The CQI information and i2 information in the channel state information are calculated according to the finally fed back joint information of RI and i1. When the fed back RI / i1 information is lost, especially when all previously fed back RI and i1 joint information is lost, the UE calculates and feeds back channel state information according to one of the following methods:

[01...

Embodiment 2

[0136] Embodiment 2, assuming that in the LTE-A system, channel state information is periodically fed back on the PUCCH, such as figure 2 As shown, when adopting feedback mode 1-1 and switching from CSI feedback mode 2 to CSI feedback mode 1, UE feedback channel state information includes RI information, i1 information, i2 information and CQI information.

[0137] In Embodiment 2, CSI feedback mode 1 means that RI information and i1 information are jointly coded and transmitted in the same subframe with a relatively long period; CQI information and i2 information are transmitted in another subframe with a relatively short period to transfer. CSI feedback mode 2 means that RI information is encoded independently and transmitted in a subframe with a relatively long period; CQI information and i1 and i2 are transmitted in another subframe with a relatively short period.

[0138] Among them, in the CSI feedback mode 2, the CQI information, i1 information, and i2 information in t...

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Abstract

The present invention provides a method and a device for feeding back channel state information. The method comprises the following steps of: determining the channel state information by a User Equipment (UE), wherein the channel state information comprises one of the following information or any combination of Rank Indicator (RI) information, Channel Quality Indication (CQI) information and Precoding Matrix Indicator (PMI) information; periodically returning the determined channel state information to a base station through a Physical Uplink Control Channel (PUCCH), wherein the PMI information possibly comprises i1 and i2. The present invention provides a technical solution for feeding back the channel state information in a Long Term Evolution Advanced (LTE-A) system, and ensures the normality of channel state information feedback. Furthermore, even though the RI information or combined coding information of RI and i1 is lost, normal feedback of the channel state information is ensured according to the method, thereby the normal operation of a communication system is ensured.

Description

technical field [0001] The present invention relates to advanced long-term evolution (LTE-A, Long Term Evolution Advanced) system technology, in particular to a channel state information feedback method and device. Background technique [0002] In wireless communication, if multiple antennas are used at the sending end (such as node eNB), the transmission rate can be improved by spatial multiplexing, that is, different data are transmitted at different antenna positions on the same time-frequency resource at the sending end. Multiple antennas are also used at the receiving end (such as the user terminal UE). In one case, the resources of all antennas are allocated to the same user in the case of a single user, that is, a user equipment exclusively occupies resources allocated to all antennas in a transmission interval. The physical resources of the above-mentioned user equipment, this transmission form is called Single User MIMO (SU-MIMO); another case is that in the case of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00
CPCH04L2025/03808H04L1/0072H04L1/0031H04L1/06H04L2001/125H04L1/0079H04L1/0026
Inventor 徐前子李儒岳陈艺戬徐俊张峻峰
Owner ZTE CORP
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