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Channel state information feedback method and user equipment

A channel state information and user equipment technology, which is applied in the directions of signaling characterized, transmission modification based on link quality, error prevention/detection using return channel, etc., can solve the problem that the base station cannot accurately know the channel state information rank indication, Reduce system flexibility and performance, channel reciprocity can not consider interference and other issues, to achieve the effect of reduced performance, improved flexibility, and good compatibility

Active Publication Date: 2014-02-12
ZTE CORP
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] For the transmission mode 9 of the R10 protocol, its feedback mode supports two modes: PMI / RI feedback and no PMI / RI feedback. In the TDD mode, no PMI / RI is generally used, and the channel reciprocity is used to obtain downlink channel state information. However, the channel reciprocity cannot consider the downlink interference, which will cause the base station to be unable to accurately know the downlink channel state information, especially the rank indication (RI) information, so that the adaptive transmission of rank cannot be realized, which reduces the flexibility and performance of the system

Method used

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  • Channel state information feedback method and user equipment

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Embodiment 1

[0079] In this embodiment, it is assumed that the base station configures a transmission mode N for a certain UE, where N is a positive integer greater than or equal to 9. The PDSCH transmission strategy of the UE is to support closed-loop spatial multiplexing of up to 8 layers, and simultaneously support Release 11 Coordinated Multipoint Transmission (COMP) transmission. In addition, the base station configures 8 CSI-RS ports for the UE, and the CSI-RS port numbers are: 15, 16, 17, 18, 19, 20, 21 and 22, respectively. Meanwhile, it is assumed that the base station configures pmi-RI-Report for the UE.

[0080] Such as figure 1 As shown, the process for the user equipment to feed back channel state information mainly includes the following steps:

[0081] Step S201, the user equipment determines the number of ports of the CSI-RS according to high-layer signaling;

[0082] Step S203, the user equipment determines the current transmission mode according to high-layer signaling...

Embodiment 2

[0090] In this embodiment, it is assumed that the base station configures the transmission mode N for a certain UE, where N is a positive integer greater than or equal to 9, then the PDSCH transmission strategy of the UE supports up to 8 layers of closed-loop spatial multiplexing, and supports version 11 . In addition, the base station configures only one CSI-RS port for the UE, and the CSI-RS port number is 15.

[0091] Specifically, the process for the user equipment to determine the channel state information feedback method includes the following main steps:

[0092] A1. The user determines the current transmission mode according to high-level signaling;

[0093] B1. The user equipment determines the second parameter y of the feedback mode Mode x-y required by the current transmission mode according to the number of high-layer signaling CSI-RS ports; since the number of CSI-RS ports is equal to 1, y=0.

[0094] Here, the feedback mode of the user equipment is represented ...

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Abstract

A method for feeding back channel state information and a user equipment. According to the number of ports of a CSI-RS and a pmi-RI-Report parameter configured at a base station side, a user equipment determines the feedback manner of channel state information to be one of the following: PMI, RI and CQI feedback; RI and CQI feedback; and CQI feedback. The above technical solution supports the switching of three feedback manner types, and can improve the flexibility and performance of the system and reduce the feedback overhead.

Description

technical field [0001] The invention relates to the field of mobile wireless communication, in particular to a channel state information feedback method and user equipment. Background technique [0002] In wireless communication technology, when the base station side (for example, evolved Node B or eNB) uses multiple antennas to transmit data, it can use spatial multiplexing to increase the data transmission rate, that is, the same time-frequency resources are used at the transmitting end to transmit data in different The different antenna positions transmit different data, and the receiving end (for example, user equipment UE) also uses multiple antennas to receive data. In the case of a single user, the resources of all antennas are allocated to the same user, and this user exclusively occupies the physical resources allocated by the base station side within a transmission interval. This transmission method is called Single User Multiple-Input Input Multiple-Out-put, refe...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/16H04L1/00
CPCH04B7/0417H04B7/063H04B7/0632H04B7/0639H04B7/065H04L1/0026H04L1/06
Inventor 李儒岳徐俊郭森宝任敏张峻峰
Owner ZTE CORP
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