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Method and apparatus for reporting channel state information

A technology of channel state information and channel matrix, which is applied in the field of communication, can solve problems such as inapplicable multi-point coordinated transmission, and achieve the effect of reducing overhead and improving applicability

Active Publication Date: 2011-08-31
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention is proposed in view of the problem that the content provided by the channel state information in the related art is not suitable for coordinated multi-point transmission. Therefore, the main purpose of the present invention is to provide a method and device for reporting channel state information to solve the above problems

Method used

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  • Method and apparatus for reporting channel state information
  • Method and apparatus for reporting channel state information
  • Method and apparatus for reporting channel state information

Examples

Experimental program
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Effect test

Embodiment 1

[0073] The UE reports the channel state information of the N transmit antenna port sets to the terminal to one transmit antenna port set in the N coordinated transmission points.

[0074] The M sets of transmitting antenna ports transmit data to the terminal through coordinated multi-point transmission, where the M sets of transmitting antenna ports are a subset of the N transmitting antenna port sets.

[0075] Wherein, N is a positive integer greater than or equal to 2, and M is a positive integer greater than or equal to 2 and less than or equal to N.

[0076] Preferably, the set of transmit antenna ports is a base station or RRH.

[0077] Preferably, for a user terminal, there is one set of first-type transmit antenna ports in the N transmit antenna port sets, and the rest are second-type transmit antenna port sets. Wherein, the first type of sending antenna port set is the sending node that receives the channel state information reported by the terminal, and the second ty...

Embodiment 2

[0090] The difference between this preferred embodiment 2 and preferred embodiment 1 is that the channel state information feedback of the second type of transmitting antenna port set is different, so this preferred embodiment 2 only describes the content of the channel state information of the second type of transmitting antenna port set, other Same as preferred embodiment one.

[0091] The channel state information of the second type of transmit antenna port set includes at least: M2 pieces of precoding matrix index information PMI, and N2 pieces of channel quality indication information, where M2 and N2 are positive integers greater than or equal to 1.

[0092] Corresponding to the above case 2, in the second preferred embodiment, M2=N-1, M2 precoding matrix index PMI includes N-1 channel precoding matrix index cPMI, each cPMI corresponds to a second type of transmit antenna port set channel state information to the terminal. And, each cPMI corresponds to a set of transmit...

Embodiment 3

[0097] The difference between this preferred embodiment 3 and preferred embodiment 1 is that the channel state information feedback of the second type of transmitting antenna port set is different, so this preferred embodiment 3 only describes the content of the channel state information of the second type of transmitting antenna port set, other Same as preferred embodiment one.

[0098] Corresponding to the third case above, in the third preferred embodiment, M2=2 ＊ (N-1), M2 precoding matrix index PMI includes N-1 best accompanying precoding matrix index BCI (Best companion indcator), each BCI corresponds to a second type of transmit antenna port set to the channel of the terminal State information, and each BCI is represented by a pair of indexes. And, each BCI corresponds to a set of transmit antenna ports, where M2=2 ＊ (N-1).

[0099] Preferably, the best accompanying precoding matrix index BCI can be represented by a pair of precoding matrix indexes (i1, i2), which is...

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Abstract

The invention discloses a method and an apparatus for reporting channel state information. The method comprises the steps that: UE determines the channel state information of paths between the UE and all sending antenna port sets; and the UE reports the channel state information to the predetermined sending antenna port sets of all the sending antenna port sets. The method and the device raise the applicability of the channel state information and reduce the cost.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for reporting channel state information. Background technique [0002] Coordinated Multiple Input Multiple Output (MIMO) technology, also known as Coordinated Multipoint Transmission (COMP) technology, uses the cooperative transmission of transmit antennas of multiple cells to improve the capacity and transmission of wireless links at the cell edge. The reliability can effectively solve the cell edge interference problem. [0003] In wireless communication, if multiple antennas are used at the sending end (eNB), the transmission rate can be improved by adopting 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 (user terminal UE). Generally speaking, there are two transmission forms of MIMO, one is Single Use...

Claims

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Application Information

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IPC IPC(8): H04L1/06
CPCH04B7/024H04L1/06H04B7/0626
Inventor 陈艺戬徐俊李儒岳张峻峰
Owner ZTE CORP
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