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Feedback method and device for channel state information

A technology for channel state information and state information, which is applied to digital transmission systems, electrical components, and error prevention. The effect of saving downlink overhead

Active Publication Date: 2016-09-07
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

In other words, in multi-point coordinated scenario 4, if there are more than two CSI-RS points in the measurement set, the excess CSI-RS points cannot obtain the feedback configuration parameters of channel state information, and there is no way to feed back channel state information

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  • Feedback method and device for channel state information
  • Feedback method and device for channel state information

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Embodiment Construction

[0015] In order to better understand the spirit of the present invention, it is further described below with reference to some preferred embodiments of the present invention.

[0016] The channel state information usually includes a precoding matrix index (PMI, Precoding Matrix Indicator), a channel quality indicator (CQI, Channel Quality Indicator) and a rank indicator (RI, Rank Indicator); and the precoding matrix index and the channel quality indicator can be fed back together.

[0017] For the channel state information feedback of the CSI-RS points in the coordinated multi-point measurement set, especially the periodic feedback on the Physical Uplink Control Channel (PUCCH, Physical Uplink Control Channel), according to the current 3GPP TS36.213, different CSI-RS points The channel state information of each can be fed back in a time division multiplexing (TDM, Time Division Multiplexing) manner to avoid collision. That is, different channel state information is fed back in...

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Abstract

The invention relates to a channel state information feedback method and device, and provides a method for sending out a notice about feedback configuration parameters of channel state information. The method includes the steps that a channel state information configuration index of one CSI-RS point in a multipoint cooperation measurement set is determined and used as a reference configuration index based on a predefined feedback configuration parameter mapping table; channel state information configuration indexes of other CSI-RS points in the measurement set are determined based on the feedback configuration parameter mapping table, the reference configuration index and a predefined differential rule; difference values between the channel state information configuration indexes of the other CSI-RS points in the measurement set and the reference configuration index are respectively determined based on the differential rule and used as respective difference value configuration indexes of the other CSI-RS points in the measurement set; the reference configuration index and the difference value configuration indexes of the other CSI-RS points in the measurement set are sent. The channel state information feedback method and device support more channel state information feedback of the CSI-RS points in a same cell in multipoint cooperation, and down link cost can be saved.

Description

technical field [0001] The present invention relates to a feedback method and device for channel state information, in particular to the channel state information of several Channel State Information-Reference Signal (CSI-RS, Channel State Information-Reference Signal) points in Coordinated Multi-Point (CoMP, Coordinated Multi-Point). feedback methods and devices. Background technique [0002] Coordinated Multipoint Transmission is a very promising technology in Long Term Evolution-Advanced (LTE-Advanced), which can effectively reduce Inter-Cell Interference (ICI, Inter-Cell Interference) and improve high data rates. rate coverage, cell edge throughput and / or system throughput. [0003] At the same time, as a technology that is constantly developing and improving, there must be some urgent problems to be solved in multi-point collaboration. For example, for the channel state information feedback mechanism in the case of multi-point cooperation, the current protocol cannot ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L1/00
Inventor 武露邓云杨红卫
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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