TDD SU-MIMO Flow Generation Using CSI-RS Feedback
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Solution Overview
Problem
Evolved NodeB (eNodeB) cannot set array antenna forming gain based on closed-loop precoding or perform downlink SU-MIMO using open-loop precoding, limiting the performance of non-polling terminals with single uplink antenna.
Innovation Solution
Implementing a flow generation method and apparatus that utilizes CSI-RS in conjunction with open-loop and closed-loop technologies to enhance SU-MIMO performance for non-polling terminals, approximating the performance of polling terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If closed-loop precoding technology is used in non-polling terminals, then the terminal can transmit data, but the position of the UE cannot be known so only wide beam coverage can be adopted and no array antenna shaping gain exists
Solution Approach 1:
The patent introduces CSI-RS (Channel State Information Reference Signals) as an intermediary to enable the eNodeB to measure the downlink channel quality and UE position. The CSI-RS is transmitted through the array antenna, allowing the eNodeB to obtain precise channel state information and UE position data without requiring the UE to have multiple uplink antennas, thus resolving the contradiction between system reliability and position measurement precision.
2Productivity
If open loop precoding technology is used, then the non-polling terminal can obtain channel state via uplink, but downlink SU-MIMO cannot be supported
Solution Approach 1:
The patent inverts the traditional approach by having the eNodeB transmit downlink reference signals (CSI-RS) that the non-polling terminal uses to measure and feed back channel state information. This allows the eNodeB to obtain accurate downlink channel state information and implement downlink SU-MIMO, resolving the limitation of open-loop precoding where downlink SU-MIMO cannot be supported.
3Area of stationary object
If wide beam coverage is adopted for non-polling terminals, then coverage is improved, but array antenna shaping gain is lost
Solution Approach 1:
The patent implements dynamic beamforming where the eNodeB adjusts the beam direction and shape based on real-time channel state information obtained through CSI-RS measurements. The system can dynamically switch between wide beam coverage and focused directional beams with shaping gain, allowing optimization of both coverage area and power efficiency according to channel conditions and UE position.
Data Source
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AI summary
Disclosed are a flow generation method and apparatus for a TDD communication system, the method comprising: an evolved node B (eNodeB) generating first weight information based on a received sounding reference signal (SRS) sent by a user terminal (UE); the eNodeB adjusting a channel state indicator information reference signal (CSI-RS) sent to the UE according to the first weight information so as to enable the UE to feed channel quality information back based on the CSI-RS; and the eNodeB generating second weight information based on the first weight information and the received channel quality information fed back by the UE, and adjusting downlink service data according to the second weight information.