Terminal Apparatus Semi-Persistent CSI-RS Resource Allocation
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Solution Overview
Problem
Current radio communication systems for fifth-generation cellular networks face inefficiencies in managing semi-persistent channel state information-reference signals (CSI-RS) within radio access technologies like NR, leading to resource element conflicts between CSI-RS and physical downlink shared channels (PDSCH), which affects communication efficiency.
Innovation Solution
The implementation of a terminal and base station apparatus that includes a higher layer processing unit and MAC layer to manage semi-persistent CSI-RS, ensuring that resource elements used for CSI-RS activation are not used for PDSCH transmission, and vice versa, through specific settings and information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semi-persistent CSI-RS is activated to improve channel state information measurement, then measurement precision is improved, but resource element conflicts with PDSCH occur reducing productivity
Solution Approach 1:
The patent implements dynamic resource element management where the base station and terminal adaptively adjust resource allocation based on CSI-RS activation state. When semi-persistent CSI-RS is activated, resource elements are dynamically reassigned to avoid conflicts with PDSCH, enabling the system to switch between measurement priority and data transmission priority modes
2Reliability
If resource elements are allocated for semi-persistent CSI-RS activation, then channel state information measurement is enabled, but resource element availability for PDSCH is reduced
Solution Approach 1:
The patent segments the resource elements into distinct functional groups: some reserved for semi-persistent CSI-RS when activated, and others available for PDSCH transmission. This segmentation allows the system to guarantee reliable channel state information measurement while maintaining sufficient resource elements for data transmission, preventing complete resource contention
3Measurement precision
If semi-persistent CSI-RS is activated for channel state information measurement, then measurement capability is improved, but resource conflict with PDSCH occurs reducing communication efficiency
Solution Approach 1:
The patent implements dynamic resource element management where the base station and terminal adaptively adjust resource allocation based on CSI-RS activation state. When semi-persistent CSI-RS is activated, resource elements are dynamically reassigned to avoid conflicts with PDSCH, enabling the system to switch between measurement priority and data transmission priority modes
Solution Approach 2:
The patent changes the resource allocation parameters dynamically based on the activation state of semi-persistent CSI-RS. By adjusting which resource elements are reserved for reference signals versus data channels, the system optimizes the balance between measurement accuracy and communication efficiency for different operational conditions
Data Source
AI summary
Provided is a terminal apparatus configured to communicate with a base station apparatus. The terminal apparatus includes: a higher layer processing unit configured to receive first information including a setting for semi-persistent channel state information-reference signal (CSI-RS) for measuring channel state information; a medium access control (MAC) layer configured to receive second information including information for activating the semi-persistent CSI-RS; and a receiver configured to receive a physical downlink shared channel (PDSCH). In the terminal apparatus, in a case where the semi-persistent CSI-RS is activated, a resource element to be used for the activated reference signal is not to be used as a resource element for the physical downlink shared channel.