Method and device for reporting CSI (Channel State Information) based on PUCCH (Physical Uplink Control Channel)

Abstract

The invention discloses a method and device for reporting CSI (Channel State Information) based on a PUCCH (Physical Uplink Control Channel), which are used for realizing accurate reporting of the CSI based on double codebooks. The method comprises the following steps of: receiving CSI reporting mode configuration information carrying a reporting mode identifier, transmitted by a network side; establishing first CSI specific to the full bandwidth of a system according to the message format of long-term / broadband CSI corresponding to the reporting mode identifier and transmitting the first CSIaccording to a first preset reporting period; and partitioning the full bandwidth of the system into at least two frequency band subsets, establishing second CSI specific to every frequency band subset respectively according to the message format of short-term / frequency-selective CSI corresponding to the reporting mode identifier, and transmitting the second CSI according to a second preset reporting period. According to the method, accurate reporting of the long-term / broadband CSI and the short-term / frequency-selective CSI is realized based on double codebooks. The invention further discloses a device for reporting the CSI based on the PUCCH.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for reporting CSI based on PUCCH. Background technique [0002] In a point-to-point communication system, if the base station side can obtain a certain channel state information (Channel State Information, CSI), it can optimize the modulation mode, coding rate and spatial distribution characteristics of the signal power of the transmitted downlink signal, so that the transmission The downlink signal matches the propagation characteristics of the channel, so as to achieve the effect of enhancing the reliability of signal reception and reducing the complexity requirements of the reception algorithm. Especially in multi-user application scenarios, the base station side can make scheduling decisions based on the CSI it obtains, thus Improve the spectrum efficiency of the system and avoid interference between cells. [0003] Currently, Long-Term Evolution (LTE) R...

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Problems solved by technology

[0008] However, the existing single-codebook-based CSI reporting mechanism does not distinguish between long-term / broadband CSI and short-term / frequency-selective CSI, and is not suitable for the dual-codebook-based PUCCH reporting mechanism specified in Rel-10.

[0009] In view of the above problems, under the prior art, the PMI and RI are multiplexed and reported together to solve the problem, that is, the existing PUCCH reporting scheme already includes a PMI reporting information, therefore, if the existing RI reporting is changed to Reporting for RI+PMI can support the reporting of two short-term / broadband PMIs. However, in this way, the equivalent coding rate of RI in the reported CSI will be increased, thereby reducing the accuracy of RI reporting, and it cannot be targeted at The multiplexing and RI independently configure the reporting period, thus losing the flexibility of the system, and PUCCH cannot support short-term / frequency selective PMI reporting

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