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Method for reporting channel state information, user equipment and base station

A technology of channel state information and user equipment, applied in transmission path sub-channel allocation, wireless communication, pilot signal allocation, etc., can solve the problem that the base station cannot obtain CSI

Active Publication Date: 2019-04-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, due to UE capability limitations, some UEs can only configure one CSI process. Therefore, a solution is needed to solve the problem that the base station cannot obtain the CSI of such UEs in different scenarios (or different interference environments). question

Method used

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  • Method for reporting channel state information, user equipment and base station
  • Method for reporting channel state information, user equipment and base station
  • Method for reporting channel state information, user equipment and base station

Examples

Experimental program
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Effect test

Embodiment 1

[0131] This embodiment specifically describes the method for reporting channel state information from the UE side. Such as figure 1 As shown, the method provided in this embodiment includes the following steps:

[0132] Step 11: The UE receives or detects the aperiodic CSI trigger signaling in subframe n, where n is an integer.

[0133] In this step, the trigger signaling of the aperiodic CSI may be carried by a physical downlink control channel (PhysicalDownlink Control Channel, PDCCH) or an enhanced physical downlink control channel (Enhanced PhysicalDownlink Control Channel, EPDDCH), or it may be carried by a physical downlink shared channel ( PhysicalDownlink Shared Channel, PDSCH), at this time, the PDSCH corresponds to a Random Access Response Grant (Random Access Response Grant), or the base station sends the aperiodic CSI trigger signaling to the user equipment in other forms.

[0134] When the aperiodic CSI trigger signaling is carried by the PDCCH or EPDCCH, the cy...

Embodiment 2

[0172] This embodiment specifically describes the method for reporting channel state information from the base station side. Such as figure 2 As shown, the method provided in this embodiment mainly includes the following steps:

[0173] Step 21, the base station sends aperiodic CSI trigger signaling in subframe n, where n is an integer.

[0174] In this step 21, the base station sends aperiodic CSI trigger signaling to the UE. For the aperiodic CSI trigger signaling, refer to the description of step 11 in the first embodiment. The aperiodic CSI trigger signaling may be carried by the PDCCH or EPDCCH, or may be carried by the PDSCH. The CRC of the PDCCH or EPDCCH can be scrambled by using the C-RNTI or the RNTI shared by multiple users. The RNTI shared by multiple users may be a CSI-RNTI. The DCI format corresponding to the PDCCH or EPDCCH may be any format or combination of format 0 and format 4. The DCI format corresponding to the PDCCH or EPDCCH may also be a preset ne...

Embodiment 3

[0198] In this embodiment, the UE does not need to feed back CSI, but the UE still needs to know the CSI measurement resources, so as to avoid these resources when transmitting signals or information on these subframes. Such as image 3 As shown, the method for obtaining CSI measurement resources mainly includes the following steps:

[0199] Step 31, UE receives downlink control channel signaling in subframe n, where n is an integer.

[0200] In the step 31, the UE receives the downlink control channel signaling in the subframe n, which may mean that the UE receives the downlink control channel signaling in the subframe n. The downlink control channel signaling may be carried by PDCCH or EPDDCH. The downlink control channel signaling in this step may be downlink assignment (DL assignment) information or uplink assignment information, such as aperiodic CSI trigger signaling, which is not limited in this embodiment.

[0201] Step 32. The UE determines the CSI measurement resour...

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Abstract

The present invention relates to a method for reporting channel state information, user equipment and a base station. The UE determines channel state information measurement resources according to aperiodic CSI trigger signaling, so that the base station only sends CSI-RS when the UE is required to report aperiodic CSI. Compared with the existing base station transmission cycle CSI-RS, unnecessary CSI-RS transmission is reduced, saving the energy of the base station such as eNB; and reducing the transmission of CSI-RS can reduce the resources occupied by CSI-RS, thereby improving The spectral efficiency of the system. In addition, reducing unnecessary CSI-RS transmission reduces the interference of the base station to other cells; finally, the CSI measurement resources are reserved only when CSI needs to be fed back, which reduces the overhead of CSI measurement resources and improves the system performance. Spectral efficiency.

Description

technical field [0001] The present invention relates to a wireless communication technology, in particular to a method for reporting channel state information, user equipment and a base station. Background technique [0002] In a wireless communication system, due to factors such as the mobility of user equipment (UE) and the multipath propagation of wireless signals, the channel state between the base station and UE changes with time, frequency, and UE location. Variety. Therefore, it is necessary to measure the channel state, and then communicate according to the measured channel state information (ChannelState Information, CSI), so as to ensure the transmission efficiency of the system and improve the service quality of the UE. [0003] For example, in a long term evolution (Long term evolution, LTE) and an advanced long term evolution (LTE-Advanced, LTE-A) system, the UE needs to measure and feed back various measurement values ​​to the base station. For example: in or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/10
CPCH04B7/0626H04B7/0645H04L5/0051H04L5/0094Y02D30/70H04W72/23H04B7/04H04B17/309Y02B70/30
Inventor 大卫·马瑞泽周永行成艳
Owner HUAWEI TECH CO LTD