Antenna correction method and system based on TDD coordinated multi-point transmission

Abstract

The invention discloses an antenna calibration method based on time division duplex (TDD) coordinated multi-point transmission, comprising: during the TDD coordinated multi-point transmission process, the base station to which a cell belongs determines that multiple antennas of the cell need to be calibrated, then The base station selects a reference antenna from multiple antennas in the cell; the base station adjusts the gain and / or phase of the radio frequency link corresponding to the antenna according to the gain and / or phase of the radio frequency link corresponding to the reference antenna Adjustment is performed, and the antenna to be adjusted is one or more of the other antennas in the cell antenna except the reference antenna. The present invention also correspondingly discloses an antenna correction system based on TDD multi-point coordinated transmission. The present invention corrects multiple antennas in the same cooperative cell by selecting a reference antenna, so that the uplink and downlink signal channels maintain reciprocity, Therefore, the validity of the SRS feedback can be guaranteed, the accuracy of the feedback can be improved, and additional resources can be saved.

Description

technical field [0001] The present invention relates to coordinated multi-point (Coordinated Multi-Point, CoMP) transmission technology, in particular to an antenna calibration method and system based on Time Division Duplexing (Time Division Duplexing, TDD) coordinated multi-point transmission. Background technique [0002] LTE-A is the latest generation of wireless communication standards developed and formulated by the International Standards Organization 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP), and is the further development and evolution of the LTE (Long Term Evolution) series of communication standards. CoMP is an important technology to be adopted in LTE-A. This technology can improve various technical indicators by using multiple nodes for cooperative transmission / reception, such as increasing the peak transmission rate and enhancing the coverage of the cell edge. , the transmission situation of each antenna in the CoMP cell to t...

AI Technical Summary

Problems solved by technology

[0012] However, because the TDD system only has reciprocity of the physical channel, affected by many factors such as temperature and path loss, the amplitude / phase of the RF link gain corresponding to each antenna will be misaligned, resulting in the uplink and downlink RF links and antennas. Gains are different, in which case the channel through which the signal flows as a whole is not reciprocal

Therefore, if the RF link and antenna gain are not corrected and compensated, the TDD system cannot directly use the feedback of the SRS method

[0013] However, the existing correction methods are mainly aimed at the gain correction problem between the uplink and downlink of the radio frequency link corresponding to an antenna or the gain correction problem between independent array elements of the same array antenna, and there is no such method applied in TDD coordinated multi-point transmission. Related Technologies for Uplink and Downlink Calibration of Radio Frequency Links Corresponding to Multiple Antennas

Images