Multi-antenna sending method based on sounding reference signal, terminal, and base station

Abstract

The invention discloses a multi-antenna sending method based on a sounding reference signal, a terminal, and a base station. Newly-added SRS sending port information and / or an SRS sending mode for indicating signals sent by a UE standby execution antenna set by turns and a control signal required by the SRS sending mode are sent to UE through eNB. The UE sends the SRS through the SRS sending mode, and the eNB estimates channel information according to the SRS and calculates and sends a pre-coding matrix. By means of the method, the terminal and the base station, the problem that when the number of receiving antennas of the UE is larger than the number of sending ports and the number of downlink configuration ports is larger than 2, downlink pre-codes calculated by the eNB according to the uplink channel matrix can not be matched with wireless channels between all the antennas of the UE and an antenna of the base station is solved; the UE can be used for solving the problem that when the number of sending antennas is larger than the number of the sending ports, the eNB has difficulty in completely obtaining the states of wireless channels between all the antennas of the UE and the eNB and the PUSCH can not be set through the optimal antenna or the optimal antenna set.

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...

AI Technical Summary

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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