A multi-antenna transmission method based on sounding reference signal, terminal and base station

Abstract

The invention discloses a multi-antenna transmission method according to a sounding reference signal, a terminal and a base station. An eNB transmits to a UE a RS including newly added SRS transmission port information and / or signaling used to instruct the UE to perform antenna group rotation. The transmission mode and the control signaling required by the SRS transmission mode, the UE transmits the SRS in the above SRS transmission mode, and the eNB estimates the channel information according to the SRS, and calculates and transmits the precoding matrix. The present invention can overcome the problem that the downlink precoding calculated by the eNB according to the uplink channel matrix cannot match the wireless channels between all UE antennas and base station antennas when the number of UE receiving antennas is greater than the number of transmitting ports and the number of downlink configuration ports is greater than 2; and the UE can be used to transmit When the number of antennas is greater than the number of transmission ports, it is difficult for the eNB to fully obtain the wireless channel conditions from all antennas of the UE to the eNB, and the PUSCH cannot be transmitted through the optimal antenna or antenna group.

Description

Technical field [0001] The present invention relates to the field of communications, in particular to a multi-antenna transmission method, terminal and base station based on sounding reference signals. Background technique [0002] Multiple-Input Multiple-Out-put (MIMO) precoding technology is divided into codebook-based precoding and non-codebook-based precoding. In contrast, non-codebook-based precoding can better match channels and improve link performance. The beamforming technology adopted by the Long Term Evolution (LTE) Time Division Duplexing (TDD) system is a non-codebook-based precoding technology. [0003] Beamforming is a method of obtaining beamforming receiving / transmitting weights by estimating the spatial channel through which the received signal propagates. In the receiving / transmitting process, the input and output signals of each antenna in the array are weighted to realize the signal beam Shaped receiving / sending. [0004] The LTE TDD mode adopts the time divis...

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Problems solved by technology

[0007] The technical problem solved by the present invention is to provide a multi-antenna transmission method based on sounding reference signals, a terminal and a base station, and solve the problem that in the prior art, when the number of receiving antennas of the UE is greater than the number of transmitting ports and the number of downlink configuration ports is greater than 2, the eNB calculates according to the uplink channel matrix The downlink precoding cannot match the wireless channel between all UE antennas and base station antennas, and it is difficult for the eNB to fully obtain the wireless channel conditions from all antennas of the UE to the eNode B when the number of transmit antennas available to the UE is greater than the number of transmit ports, and the PUSCH cannot pass through the most Optimum Antenna or Antenna Group to Send Questions

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