Channel state information transmission method and equipment

Abstract

The embodiment of the invention discloses a channel state information (CSI) transmission method and equipment, relating to the technical field of wireless communication; and the method and the equipment are used for synchronously feeding back CSI of a plurality of downlink carriers to improve the downlink scheduling accuracy. In the invention, a terminal determines a CSI feedback bit number threshold in a present uplink subframe and a total CSI feedback bit number of a plurality of downlink carriers needing feedback of CSI in the present uplink subframe, and then judges whether the total CSI feedback bit number is greater than the CSI feedback bit number threshold or not; if so, the CSI fed back in the present uplink subframe needs to be compressed; and the compressed CSI is fed back to a base station in the present uplink subframe; otherwise, the CSI of the plurality of downlink carriers is fed back to the base station in the present uplink subframe. According to the invention, the downlink scheduling accuracy can be improved in the invention.

Description

Technical field [0001] The present invention relates to the field of wireless communication, and in particular to a method and equipment for transmitting channel state information. Background technique [0002] For the Long Term Evolution Advanced (LTE-A) system, in order to support a wider system bandwidth than the Long Term Evolution (LTE) system, some spectrums allocated to the existing system can be aggregated to make up The large bandwidth is used for long-term evolution multi-carrier systems, that is, Carrier Aggregation (CA) technology. At this time, the uplink and downlink carriers in the system can be configured asymmetrically, that is, the user may occupy N1 ≥ 1 carrier for downlink transmission, and N2 ≥ 1 carrier for uplink transmission, such as figure 1 Shown. [0003] In the LTE-A version 10 (Rel-10) CA system, in order to effectively perform the carrier scheduling and link adaptation process, the base station needs to obtain the channel state information (Channel st...

AI Technical Summary

Problems solved by technology

[0037] In the current LTE-A Rel-10 system, the UE cannot report the periodic CSI of multiple downlink carriers in one uplink subframe at the same time. Reporting the periodic CSI of each carrier through TDM will cause the CSI feedback period of some carriers to be relatively large. And considering that the feedback density of ACK / NACK and CSI in the LTE-A system is relatively large, in the existing mechanism, the probability of CSI being discarded and not reported is also relatively high, so that the base station cannot obtain the CSI on these carriers in time, thus affecting the downlink Scheduling accuracy

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