Multi-TRP Beam Indication for Simultaneous Downlink Reception
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Solution Overview
Problem
In beam-based communication systems, particularly in high-frequency environments, terminal devices face challenges in simultaneously receiving downlink signals from multiple transmission reception points (TRPs) due to inconsistent beam selection policies, leading to suboptimal data receiving throughput.
Innovation Solution
A method for indicating beam types to terminal devices to simultaneously receive signals from different directions, using various signaling mechanisms such as MAC CE, DCI, and TCI configurations, to establish a consistent understanding between the network device and the terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses beam-based communication to receive downlink signals from multiple TRPs, then the antenna gain is improved and high-frequency signal attenuation is overcome, but the terminal device cannot simultaneously receive signals from multiple TRPs due to inconsistent beam selection policies
Solution Approach 1:
The patent segments the beam selection process by introducing separate beam selection policies for different TRPs. The network device configures first beam selection policy for first TRP and second beam selection policy for second TRP, allowing the terminal device to independently select beams for each TRP without interference. This segmentation enables simultaneous reception from multiple TRPs while maintaining optimal beam alignment for each.
Solution Approach 2:
The patent implements dynamic beam selection by allowing the terminal device to switch between different beam selection policies based on real-time communication conditions. The network device can dynamically indicate which beam selection policy to use, and the terminal device can adapt its beam selection based on received signals, enabling flexible and optimal reception from multiple TRPs simultaneously.
2Productivity
If the terminal device receives downlink signals from multiple TRPs simultaneously, then the data receiving throughput is improved, but the beam selection complexity increases due to multiple beam selection policies
Solution Approach 1:
The patent introduces the network device as an intermediary that manages beam selection complexity. The network device configures and indicates the appropriate beam selection policies to the terminal device, acting as a mediator that simplifies the terminal's decision-making process. Instead of the terminal independently determining complex beam selections, it follows network-provided policies, reducing computational complexity while enabling multi-TRP reception.
3Reliability
If the network device indicates beam types for downlink signals, then consistent understanding between network device and terminal device is established, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure and indicate beam selection policies before the terminal device needs to receive signals from multiple TRPs. The network device provides beam type indications in advance, allowing the terminal device to prepare appropriate receive beams beforehand. This preliminary indication reduces the need for continuous signaling during data reception, minimizing overhead while ensuring consistent beam selection.
Data Source
AI summary
This application provides a signal transmission method and a communication apparatus. The method includes: indicating a beam type used for a terminal device to receive a first downlink signal and/or a second downlink signal, where a time domain resource of the first downlink signal overlaps a time domain resource of the second downlink signal, the beam type includes a first beam type or a second beam type, the first beam type indicates: a first beam used when the terminal device can simultaneously receive a first reference signal and a second reference signal, and/or a second beam used when the terminal device can simultaneously receive the first reference signal and the second reference signal, and the second beam type indicates: a beam used when the terminal device can receive the first reference signal, and/or a beam used when the terminal device can receive the second reference signal.