UE Autonomous CSI-RS Resource Selection for 5G Beam Accuracy
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Solution Overview
Problem
In 5G mobile communications, user equipment (UE) may not report the best measurement result for channel state information, leading to suboptimal transmit beams or antenna ports being indicated by the base station, resulting in inefficient information transmission.
Innovation Solution
The base station configures multiple CSI-RS resources and sends them using different antenna ports, allowing the UE to measure and feedback the best resource, enabling the UE to autonomously select the optimal CSI-RS resource and antenna port for subsequent information transmission, improving receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station indicates transmit beams or antenna ports based on channel state information feedback from the UE, then the information transmission efficiency is improved, but the system performance deteriorates when the UE does not report the best measurement result
Solution Approach 1:
The UE autonomously determines the antenna port with the best receiving performance by measuring reference signals from multiple antenna ports and selecting the optimal one without requiring base station indication, thereby ensuring reliable beam selection even when the UE does not report the best measurement result
Solution Approach 2:
The base station pre-configures multiple CSI-RS resources with different antenna ports before actual data transmission, allowing the UE to perform measurements and determine the best antenna port in advance, ensuring optimal beam selection is available when needed
Data Source
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AI summary
This application provides a communication method and an apparatus. The communication method includes: receiving, by user equipment, first indication information from a network device, where the first indication information indicates a first resource; determining, by the user equipment, a second resource, where the second resource and the first resource belong to a same resource set configured by the network device, and the first resource and the second resource are used to transmit a first downlink reference signal; and receiving, by the user equipment on a third resource, a second signal and/or channel transmitted by using a third antenna port, where the third antenna port has a quasi co-location QCL relationship with a second antenna port used when the first downlink reference signal is transmitted on the second resource. In this solution, the user equipment autonomously selects a downlink reference signal resource, and uses, during subsequent information transmission, an antenna port that has the QCL relationship with an antenna port corresponding to the autonomously selected downlink reference signal resource. This improves information receiving performance.