Dynamic CSI Reporting Type Adaptation
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Solution Overview
Problem
Current wireless communication technologies, particularly in LTE, face challenges in flexible CSI reporting due to rigid associations between transmission modes and feedback schemes, leading to inefficiencies in spatial resolution and reporting validity, especially with increasing antenna usage and varying reporting needs.
Innovation Solution
A terminal and network node system that dynamically determines CSI report types based on downlink control information messages, allowing for quick adaptation of measurement reporting to match current conditions, decoupling transmission modes from measurements, and enabling flexible reporting configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high spatial resolution CSI reports are used for highly beamformed transmission, then measurement precision is improved, but reporting frequency must be increased which increases signaling overhead and reduces time efficiency
Solution Approach 1:
The patent applies dynamics by making the CSI reporting type configurable and switchable between different modes (e.g., high-resolution vs. low-resolution reporting). The network can dynamically adjust the reporting configuration based on current channel conditions, transmission mode, and quality of service requirements, allowing the system to adapt between detailed frequent reporting and coarser less frequent reporting as needed.
Solution Approach 2:
The patent changes the parameter of CSI reporting resolution and type based on transmission mode and channel conditions. Different CSI reporting types (e.g., full CSI, simplified CSI, beam-specific CSI) are selected according to the active transmission mode, allowing the system to optimize between measurement precision and reporting overhead by adjusting the reporting parameters rather than always using high-resolution reporting.
2Adaptability or versatility
If transmission mode is changed using RRC signaling to adjust CSI feedback scheme, then adaptability is improved, but signaling delay increases due to higher layer signaling
Solution Approach 1:
The patent segments the CSI reporting configuration into multiple independent components that can be controlled at different layers. The RRC layer configures the set of available CSI reporting types and associated parameters, while the physical layer (PDCCH) can dynamically trigger specific reporting types from this pre-configured set. This segmentation allows fast switching via physical layer signaling without requiring full RRC reconfiguration.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple CSI reporting type options through RRC signaling before actual transmission occurs. When the transmission mode changes or channel conditions require different reporting, the UE already has the alternative reporting configurations ready, and the network can simply trigger the appropriate pre-configured type via faster physical layer signaling rather than negotiating new configurations in real-time.
3Adaptability or versatility
If multiple CSI processes are configured for TM10, then adaptability is improved, but device complexity increases and reporting overhead increases
Solution Approach 1:
The patent applies universality by designing a unified CSI reporting framework where a single CSI process can support multiple transmission modes and reporting types. Instead of requiring separate CSI processes for different transmission schemes (TM3, TM4, TM10), the system uses one versatile CSI process that can be configured to report different types of CSI (e.g., CQI only, CQI+PMI+RI, beam-specific CSI) depending on the active transmission mode and network configuration.
4Reliability
If CSI reporting is tied to transmission mode with RRC configuration, then reliability is improved through dedicated feedback schemes, but ease of operation deteriorates due to rigid configurations
Solution Approach 1:
The patent makes the CSI reporting configuration dynamic by allowing the network to trigger different reporting types via PDCCH signaling based on current transmission mode and channel conditions. The system maintains reliable matching between feedback scheme and transmission mode through dynamic selection from pre-configured options, rather than being locked into static RRC-configured pairings.
Data Source
AI summary
This disclosure pertains to a terminal for a Radio Access Network, the terminal being adapted for transmitting a measurement report on received reference signaling. The measurement report is based on one report type out of a set of possible report types, the terminal determining the report type of the measurement report based on a measurement report type indication in a downlink control information message received by the terminal. There are also disclosed further related methods and devices.