Terminal Device Beam Determination Using RSRP Measurement
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Solution Overview
Problem
Communication performance deteriorates due to the inability of terminal devices to determine the correct receive beam when the reference signal corresponding to the resource indicated by the TCI state is inconsistent with the optimal receive beam determined by the terminal device, especially in CSI-RS resource sets configured with repetition on.
Innovation Solution
The terminal device measures multiple reference signals across CSI-RS resources configured with repetition on, determines the resource with the maximum RSRP, and uses the corresponding receive beam to receive information, ensuring that the resource indicated by the TCI state and the resource with the maximum RSRP are quasi-co-located, thereby avoiding communication performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device uses the reference signal corresponding to the resource indicated by the TCI state for receive beam determination, then the configuration is simple, but the reference signal may be inconsistent with the optimal receive beam, causing communication performance deterioration
Solution Approach 1:
The terminal device performs receive beam determination in advance by measuring reference signals on multiple resources in the CSI-RS resource set configured with repetition on, determines the resource with maximum RSRP, and identifies the corresponding receive beam before actual data reception. This preliminary beam determination ensures the terminal uses the optimal receive beam even when the TCI state points to a different resource.
2Reliability
If the terminal device measures reference signals on multiple resources to determine the optimal receive beam, then the communication performance is improved, but the measurement complexity and time consumption increase
Solution Approach 1:
The CSI-RS resource set configured with repetition on serves multiple functions: it is used for both channel state information measurement and receive beam determination. The terminal device measures reference signals on multiple resources within this resource set to identify the optimal receive beam, thereby making the resource set multi-functional and avoiding the need for separate dedicated beam measurement resources.
Solution Approach 2:
The terminal device changes the measurement parameter from a single reference signal (as in traditional TCI-based approaches) to multiple reference signals across different resources in the CSI-RS resource set. By evaluating multiple parameters (RSRP values) and selecting the optimal one, the system achieves more accurate beam determination.
3Measurement precision
If the CSI-RS resource set is configured with repetition on, then the channel state information measurement is enhanced, but the terminal device cannot determine the correct receive beam when TCI points to resources in this set
Solution Approach 1:
The terminal device measures reference signals on multiple resources in the CSI-RS resource set, compares the RSRP values, and provides feedback to itself (internal decision-making) to identify the resource with maximum RSRP and determine the corresponding receive beam. This feedback mechanism enables the terminal to autonomously resolve the beam determination issue without additional network configuration.
Data Source
AI summary
This application provides a communication method and device. The method includes: A terminal device receives a reference signal from a network device, wherein the reference signal is not in a channel state information-reference signal (CSI-RS) resource set, configured with repetition on; and performs radio link monitoring (RLM) measurement or beam failure detection (BFD) measurement on the reference signal. According to the communication method and device provided in this application, the terminal device expects that the resource configured by the network device for performing BFD or RLM is not any resource in the CSI-RS resource set configured with the repetition on.