Semi-Persistent CSI-RS Beam Management Signaling
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Solution Overview
Problem
In NR systems, frequent reconfiguration of beam information is necessary for downlink control signals, data, and reference signals, leading to signaling overhead and inefficiencies, especially when changing beams for multiple component carriers or channels.
Innovation Solution
Implementing a method that allows for semi-persistent CSI-RS and dynamic beam change signaling, enabling efficient time and frequency tracking, and reducing signaling overhead by changing beams for multiple component carriers or channels through a single session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequent RRC reconfiguration is performed to change beam information for downlink control signals, data, and reference signals, then beam tracking accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by configuring semi-persistent CSI-RS resources in advance through RRC signaling, so that beam tracking can be performed without frequent RRC reconfigurations. The CSI-RS resources are pre-configured with parameters such as time domain location, frequency domain location, and resource element patterns, enabling the UE to perform tracking efficiently without requiring repeated high-layer signaling.
Solution Approach 2:
The patent implements dynamics by introducing MAC CE-based activation and deactivation of semi-persistent CSI-RS resources. This allows the network to dynamically enable or disable beam tracking resources based on current channel conditions and beam requirements, providing flexible adaptation without the overhead of frequent RRC reconfigurations while maintaining accurate beam tracking when needed.
2Reliability
If beam information is reconfigured for multiple component carriers or channels, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies merging by enabling a single MAC CE to activate or deactivate semi-persistent CSI-RS resources across multiple component carriers or channels simultaneously. This consolidated approach allows the network to manage beam tracking for multiple carriers through one signaling message, maintaining transmission reliability across all carriers while significantly reducing the signaling overhead that would result from individual reconfigurations.
3Loss of information
If semi-persistent CSI-RS is configured without beam change signaling, then signaling overhead is reduced, but beam tracking efficiency decreases
Solution Approach 1:
The patent implements dynamics by introducing MAC CE-based activation and deactivation control for semi-persistent CSI-RS resources. This enables the network to dynamically enable beam tracking when channel conditions require it and disable it when not needed, optimizing beam tracking efficiency while maintaining low signaling overhead during periods when tracking is not required.
Solution Approach 2:
The patent applies feedback by enabling the UE to measure channel conditions using the semi-persistent CSI-RS resources and report beam quality metrics back to the network. This feedback mechanism allows the network to make informed decisions about when to activate or deactivate beam tracking resources, ensuring efficient beam tracking is performed only when necessary to maintain link quality.
Data Source
AI summary
The present disclosure relates to a communication method for converging IoT technology with 5G communication systems for supporting higher data transmission rates than beyond 4G systems, and to a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. The present invention characterizes in a method for a terminal of a wireless communication system, wherein the method comprises the steps of: receiving channel or reference signal configuration information including beam-related configuration information via higher layer signalling; transmitting and receiving the channel or a reference signal to and from a base station on the basis of the beam-related configuration information; receiving beam change information for the channel or reference signal; and transmitting and receiving the channel or reference signal of a plurality of component carriers to and from the base station on the basis of the beam change information, wherein the beam-related configuration information and the beam change information include transmission configuration indicator (TCI) state information of the channel or reference signal.