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Method for reporting channel state information (CSI) and base station

A technology for channel state information and reporting, applied in transmission path sub-channel allocation, wireless communication, signaling allocation, etc., can solve problems such as affecting the reliability of CSI report data transmission, increasing feedback overhead, and redundancy.

Active Publication Date: 2010-12-08
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] Feedback of CSI reports for multiple (downlink) component carriers at one time can reduce the feedback delay, thereby improving downlink performance, and for aperiodic CSI feedback, it can also save trigger signaling overhead; however, multiple (downlink) component carriers at the same time Feedback of CSI will increase the feedback overhead, which may lead to redundant CSI reports in some cases, and may also affect the reliability of CSI reports and uplink data transmission

Method used

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  • Method for reporting channel state information (CSI) and base station
  • Method for reporting channel state information (CSI) and base station
  • Method for reporting channel state information (CSI) and base station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Define two periodic CSI report methods:

[0110] Method 1: Feedback the periodic CSI report of one component carrier at a time;

[0111] Method 2: feedback periodic CSI reports of multiple component carriers at one time;

[0112] The base station configures the periodic CSI reporting mode of a user equipment as mode 1 or mode 2 through high-layer signaling. When it is configured as mode 2, the user equipment feeds back periodic CSI reports of all configured or activated (downlink) component carriers once.

Embodiment 2

[0114] The base station enables a user equipment to feed back periodic CSI reports of multiple component carriers at one time through high-layer signaling.

[0115] If for a certain user equipment, the periodic CSI report of multiple component carriers fed back at one time is not enabled, the user equipment feeds back the periodic CSI report of one (downlink) component carrier configured or activated at one time; The periodic CSI report of component carriers is enabled, and the user equipment feeds back the periodic CSI reports of all configured or activated (downlink) component carriers at a time.

[0116] When the user equipment feeds back the periodic CSI reports of multiple component carriers at a time, the periodic CSI reports are transmitted on a PUCCH with a specific format, or transmitted on multiple PUCCHs, or transmitted on the PUSCH.

[0117] The PUCCH in a specific format refers to a PUCCH specially used to carry uplink control information with a large amount of in...

Embodiment 3

[0142] Define 2 aperiodic CSI reporting methods:

[0143] Method 1: Feed back the aperiodic CSI report of one component carrier at a time;

[0144] Method 2: feedback aperiodic CSI reports of multiple component carriers at one time;

[0145] The base station configures the aperiodic CSI reporting mode of a user equipment as mode 1 or mode 2 through high-layer signaling. When it is configured as mode 2, the user equipment feeds back the aperiodic CSI reports of all configured or activated (downlink) component carriers once.

[0146] In the TDD system, the base station configures or activates three component carriers for the user equipment, namely CC0, CC1 and CC2.

[0147] If the aperiodic CSI reporting mode of the user equipment is configured as mode 1:

[0148] When the user equipment detects its PDCCH with a specific downlink control information format, the PDCCH schedules the user equipment to send PUSCH on CC0 (or CC1 or CC2), and where CQI request=1, the user equipment...

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Abstract

The invention provides a method for reporting channel state information (CSI). The method comprises the step that: a base station indicates user equipment to feed back one or more CSI reports of component carriers at one time. The invention also provides the base station, which is used for indicating the user equipment to feed back one or more CSI reports of the component carriers at one time.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for reporting channel state information and a base station. Background technique [0002] In the 3rd Generation Partnership Project Long Term Evolution (The 3rd Generation Partnership Project Long Term Evolution, 3GPP LTE), the user equipment (User Equipment, UE) obtains the channel state information (Channel State) of the downlink channel according to the downlink reference signal (reference signal). Information, CSI), and then feed back the obtained CSI to the base station (eNodeB, eNB). According to the CSI fed back by the UE, the base station determines the modulation and coding scheme, the location of the physical resource, and the transmission mode of the data sent to the UE. In the LTE system, CSI includes three forms: channel quality indication (Channels Quality Indication, CQI), precoding matrix indication (Pre-coding Matrix Indicator, PMI) and rank indica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
CPCH04L5/0094H04W24/00H04W72/0453H04W88/08H04L5/0028H04L5/0087H04W24/10H04L5/0082H04W88/02H04L1/00H04L5/0083H04L5/001H04L1/0026H04L5/0098H04L5/14H04W72/085H04L1/0027H04L5/0057H04W72/542H04L27/26H04L1/06
Inventor 朱鹏戴博梁春丽喻斌
Owner ZTE CORP
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