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Method, device and system for feeding back channel state information

A channel state information and channel technology, which is applied in the direction of transmission modification based on link quality characterized by signaling, prevention/detection of errors through diversity reception, etc., can solve the problem that the base station cannot obtain the channel state information of the downlink carrier in time. Problems such as the accuracy of downlink scheduling, to achieve the effect of improving service reliability and accuracy

Active Publication Date: 2012-03-14
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

Considering that periodic CSI and aperiodic CSI in the LTE-A system may correspond to different downlink carriers, discarding CSI information will cause the base station to fail to obtain channel state information of some downlink carriers in time, thus affecting the accuracy of downlink scheduling. Therefore, the protocol The CSI feedback method for the LTE system formulated in Rel-8 is no longer applicable to the LTE-A system. For the LTE-A system, a new CSI feedback mechanism needs to be formulated

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  • Method, device and system for feeding back channel state information
  • Method, device and system for feeding back channel state information
  • Method, device and system for feeding back channel state information

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Embodiment Construction

[0042] In the LTE-A system, in order to realize simultaneous feedback of periodic CSI and aperiodic CSI on the physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH), the user equipment (UE) in the embodiment of the present invention determines the The first uplink carrier where the PUCCH of CSI is located, the second uplink carrier where the PUSCH used to transmit CSI is located, and the periodic CSI and aperiodic CSI to be fed back are determined. Then, the UE transmits the pending CSI through the PUCCH in the first uplink carrier. The periodic CSI to be fed back, and the aperiodic CSI to be fed back are sent through the PUSCH in the second uplink carrier.

[0043] Correspondingly, on the base station side, the base station determines the first uplink carrier on which the PUCCH used to transmit CSI is located, and the second uplink carrier on which the PUSCH used to transmit CSI is located, and determines the attributes of the periodic CSI and aper...

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Abstract

The invention relates to the field of communication, in particular to a method, a device and a system for feeding back and receiving CSI (Channel State Information). The method is realized in such a way that a feedback mechanism of the CSI is formulated aiming at an LTE-A (Long Term Evolution-Advanced) system, i.e. cyclic CSI to be fed back is transmitted through a PUCCH (Physical Uplink Control Channel) and non-cyclic CSI to be fed back is transmitted through a PUSCH (Physical Uplink Shared Channel) when cyclic CSI and non-cyclic CSI corresponding to a plurality of downlink carriers simultaneously exist in one uplink subframe, therefore, simultaneous transmission of the cyclic CSI and the non-cyclic CSI in one uplink subframe is realized through the PUCCH and the PUSCH, the cyclic CSI or the non-cyclic CSI corresponding to part of downlink carriers is prevented from being discarded, a base station side is enabled to simultaneously obtain channel state information of different downlink carriers, further the accuracy of downlink schedule of the system is improved and the service reliability of the system is improved. The invention also provides a corresponding device and a corresponding system.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for feeding back channel state information. Background technique [0002] In the Long Term Evolution-Advanced (LTE-Advanced) system, referred to as the LTE-A system, in order to support a wider system bandwidth than the LTE system, such as 100MHz, the following two spectrum allocation methods are usually used: [0003] One is to directly allocate the spectrum with a bandwidth of 100M in the form of a single spectrum, specifically as figure 1 shown. [0004] The other is to use the spectrum aggregation method to aggregate the spectrum allocated to the existing system into 100M bandwidth for the system to use, specifically as figure 2 shown. refer to figure 2 As shown, when the spectrum aggregation method is adopted, the uplink and downlink carriers in the LTE-A system can be configured asymmetrically, that is, the user terminal can occupy N≥1 car...

Claims

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Application Information

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IPC IPC(8): H04L1/06
CPCH04L1/0026H04L1/0027
Inventor 高雪娟沈祖康林亚男潘学明
Owner DATANG MOBILE COMM EQUIP CO LTD
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