Feedback method and device for channel state information
A channel state information and channel technology, applied in the directions of transmission path sub-channel allocation, location diversity, signaling allocation, etc., can solve the problems of poor flexibility and low CSI accuracy, and achieve the effect of improving accuracy and flexibility
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Embodiment 1
[0075] The embodiment of the present application may run on a network architecture including one or more UEs and one or more TPs.
[0076] In this embodiment, a method for feedbacking channel state information running on the above-mentioned network architecture is provided, figure 1 is a flow chart of a feedback method for channel state information according to an embodiment of the present invention, such as figure 1 As shown, the process includes the following steps:
[0077] Step S12, the terminal performs measurements on one or more sets of measurement resources according to the signaling sent by the base station and / or its own assumptions, and obtains a measurement result corresponding to each set of measurement resources;
[0078] Step S14, the terminal calculates the DMRS port corresponding to each group of measurement resources according to the signaling and / or its own assumptions and measurement results, and / or, the CSI on the DMRS port group;
[0079] In step S16, t...
Embodiment 1
[0128] Preferred embodiment one (advanced receiver in JT)
[0129] figure 2 It is a schematic diagram of two TPs sending data for the same terminal in a non-coherent JT manner according to a preferred embodiment of the present invention. Such as figure 2As shown, in order to help the TP determine the transmission mode (Transmission Mode, referred to as TM) and the modulation and coding scheme (Modulation and Coding Scheme, referred to as MCS) used, the UE needs to feed back CSI, where the CSI may include but not limited to the following at least One: RI, PMI, CQI, CRI; RI indicates the rank of the channel matrix, that is, the number of layers used for transmission, PMI is the precoding matrix suggested by the terminal according to the channel information, and CQI is the modulation and coding method suggested by the terminal according to the channel information ; CRI is the index of the CSI-RS with the best signal condition; the calculation of CQI depends on the assumptions...
Embodiment 2
[0158] Preferred embodiment 2 (feedback single code word stream CQI when RI>1 is supported)
[0159] The current protocol stipulates that for the first transmission, if the feedback RI>1, then the dual-code word stream CQI needs to be fed back, the single-code word stream CQI is only fed back when RI=1, and the single-code word stream is fed back only when RI>1 is supported during retransmission word stream CQI, however, which limits the gain of non-coherent JT. Figure 6 It is a schematic diagram according to the related art that when RI>1, feedback of dual code word stream CQI is not friendly enough to support JT. Such as Figure 6 As shown, it is assumed that the UE has 4 antennas, and each TP can transmit 2 data streams to the UE. Theoretically, two TPs jointly can transmit 4 data streams at the same time. However, in the current protocol, each UE can only transmit at most two codeword streams at the same time. If the RI of TP1 is considered to be 2, and the CQI of dual ...
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