Uplink antenna selection method and device

Abstract

The invention discloses an uplink antenna selection method and device. The method comprises the steps of reading the current subframe of a downlink antenna when an open loop antenna selection mode isstarted; measuring the signal parameters of the current downlink antenna according to each channel state information measurement sub-frame when the current sub-frame is the channel state information measurement sub-frame; and selecting an uplink antenna with optimal signals according to the signal parameters as an uplink signal transmission antenna. The invention further discloses an uplink antenna selection device. According to the method, the gain and the performance of the antenna can be ensured, and the accuracy and the reliability of the information reported by a terminal in the high-speed moving state can be improved, so that a user can obtain better voice and data services.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an uplink antenna selection method and device. Background technique [0002] In the LTE (Long Term Evolution, Long Term Evolution) technology of 3GPP (3rd Generation Partnership Project, the third generation partnership project), according to different duplex modes, the LTE system can be divided into LTE-FDD (Frequency Division Duplexing, frequency division dual In these two duplex modes, the RRC (Radio Resource Control, radio resource control) layer on the network side can control whether the UE (User Equipment, user terminal) Enable the selection of the uplink antenna and specify the uplink antenna selection mode, and the UE selects different uplink antennas in different modes to send uplink signals to the network side. [0003] At present, LTE supports uplink antenna selection technology. The uplink antenna selection technology defined in the 3GPP standard can ...

AI Technical Summary

Problems solved by technology

The open-loop antenna selection technology does not take advantage of channel changes, and the user device only periodically switches the uplink signal transmission antenna repeatedly, which is weak in switching gain and performance; and in the case of high-speed mobile UE, the closed-loop antenna selection technology is due to the rapid channel change. , the delay in the feedback process will cause the channel state when the uplink antenna is selected to be different from the state at the time of feedback, resulting in an increase in the error rate of antenna selection. In the closed-loop antenna selection technology, the selection switching time is relative to CSI (Channel State Information, channel state information) feedback. Delay will undoubtedly lead to changes in the real state of the channel, and the more the UE moves at a high speed, the more obvious this change will be. Some data show that when the UE moves faster than 120km / h, the error rate of the feedback information of the closed-loop feedback scheme will reach 10%, greatly reducing the accuracy and reliability of antenna reception

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