CSI Reporting Based on Transmission Hypothesis for Multi-TRP
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Solution Overview
Problem
In wireless communication networks, multi-TRP transmissions lead to excessive control signaling, resulting in lost transmissions and increased data usage due to the need for extensive channel state information (CSI) feedback, particularly in ultra-reliable low-latency communication (URLLC) scenarios.
Innovation Solution
The method involves generating and transmitting CSI reports based on transmission hypotheses, which include channel quality indicators for single and multiple TRP transmissions, optimized by user equipment capability and triggered by specific events, to reduce overhead while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP transmissions are implemented to improve reliability and spectral efficiency, then transmission performance is improved, but control signaling overhead increases excessively
Solution Approach 1:
The CSI report is segmented into two distinct parts: Part 1 contains CQI values for single-TRP transmission hypotheses, while Part 2 contains CQI values for multi-TRP joint transmission hypotheses. This segmentation allows the system to selectively report only the necessary hypotheses based on transmission configuration, reducing overall signaling overhead while maintaining the ability to support both single-TRP and multi-TRP operations for improved reliability.
Solution Approach 2:
The system implements partial reporting by allowing the UE to report only a subset of all possible transmission hypotheses. Instead of requiring complete CSI feedback for all potential TRP combinations, the UE reports CQI values only for relevant hypotheses configured by the network, reducing control signaling overhead while maintaining sufficient information for reliable multi-TRP transmissions when needed.
2Measurement precision
If extensive CSI feedback is required for multi-TRP transmissions, then transmission accuracy is improved, but data usage increases and transmissions are lost
Solution Approach 1:
The patent extracts only the essential CSI components needed for multi-TRP operation. Instead of requiring complete CSI feedback for all possible transmission scenarios, the system extracts and reports only the CQI values for specifically configured transmission hypotheses (single-TRP and multi-TRP). This extraction approach maintains measurement precision for the relevant hypotheses while significantly reducing data usage and preventing transmission losses.
Solution Approach 2:
The system changes the parameter reporting structure by introducing a two-part CSI report format with different granularity levels. Part 1 reports CQI for single-TRP hypotheses with standard precision, while Part 2 reports CQI for multi-TRP joint transmission hypotheses. This parameter change allows the system to maintain accuracy where needed while reducing overall feedback volume, improving data usage efficiency.
3Loss of information
If CSI reports are generated for all transmission hypotheses, then comprehensive channel information is obtained, but reporting complexity and processing load increase
Solution Approach 1:
The network performs preliminary configuration by pre-defining the set of transmission hypotheses for which CSI feedback is required. Before the UE generates CSI reports, the network configures the specific single-TRP and multi-TRP hypotheses that are relevant for the current transmission scenario. This preliminary action reduces reporting complexity by eliminating the need for the UE to process and report all possible hypotheses, while maintaining information completeness for the configured hypotheses.
Solution Approach 2:
The CSI reporting structure is made dynamic and adaptable to different transmission scenarios. The system can dynamically switch between reporting only single-TRP hypotheses, only multi-TRP hypotheses, or both, depending on the current transmission configuration and network conditions. This dynamic approach reduces reporting complexity by adapting the report content to actual needs, while maintaining information completeness for the active transmission modes.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for reporting CSI based on a transmission hypothesis. One method includes receiving a CSI reporting configuration corresponding to TRPs. The method includes receiving at least one CSI reference signal resource based on the CSI reporting configuration. The method includes generating at least one CSI report corresponding to a transmission hypothesis. The at least one CSI report includes at least one CQI value; each hypothesis corresponds to a single TRP or multiple TRPs jointly transmitted from two TRPs, and a transmission configuration including two TCI states corresponds to the TRPs; the at least one CSI report is transmitted based on a CSI reporting trigger; and a number of CSI reports of the at least one CSI report is generated based on a UE capability of the UE.