Multi-TRP Beam Reporting via Resource Set Segmentation
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Solution Overview
Problem
Current CSI reporting in multi-TRP scenarios fails to differentiate between reference signals received from different transmission and reception points (TRPs), leading to inefficiencies in beam management and channel state information measurement.
Innovation Solution
Configuring user equipment (UE) to receive and report channel state information measurements for multiple TRPs, with explicit or implicit indication of reference signal resources for each TRP, allowing the UE to select and report beams from distinct TRP resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE reports CSI measurements for multiple TRPs using current specification, then the reporting process is simple, but the base station cannot differentiate which RS were sent from which TRP
Solution Approach 1:
The reference signal resources are segmented into separate resource sets, where each resource set is associated with a specific TRP. The UE performs measurements on each resource set and reports them separately, allowing the base station to differentiate which measurements correspond to which TRP while maintaining a relatively simple reporting structure.
Solution Approach 2:
Resource set indicators (RSRI) are introduced as an intermediary element that links the measured reference signals to their corresponding TRPs. The RSRI serves as an identifier that the UE includes in its CSI report, enabling the base station to map the reported measurements back to the specific TRP that transmitted each reference signal.
2Adaptability or versatility
If the UE measures and reports beams from multiple TRPs, then beam management capability is enhanced, but the measurement and reporting process becomes more complex
Solution Approach 1:
The measurement process is segmented by configuring separate resource sets for each TRP, allowing the UE to independently measure and evaluate beams from different TRPs. This structured approach enables comprehensive multi-TRP beam management while organizing the complexity into manageable, separate measurement tasks rather than a single complex process.
Solution Approach 2:
The system adds a new dimension to beam management by enabling measurements across multiple TRPs simultaneously. Instead of single-TRP beam management, the UE now operates in a multi-TRP dimension, evaluating beams from multiple spatial locations and reporting the best combinations, thereby enhancing adaptability without proportionally increasing process complexity.
3Measurement precision
If separate resource sets are configured for each TRP, then TRP differentiation is achieved, but the configuration and signaling overhead increases
Solution Approach 1:
The TRP identification information is extracted from the reference signal configuration itself through resource set indicators. Instead of adding separate signaling channels for TRP identification, the system extracts and utilizes existing resource set structures to carry the differentiation information, achieving precise TRP measurement differentiation without proportionally increasing configuration overhead.
Solution Approach 2:
The resource set configuration serves multiple functions: it defines the reference signals for measurement, identifies the associated TRP through resource set indicators, and organizes the measurement process. This multi-functional approach achieves precise TRP differentiation while reducing the need for separate dedicated signaling mechanisms.
Data Source
AI summary
A base station configures a user equipment (UE) to perform measurements. The base station configures the UE for at least one channel state information (CSI) measurement report including an indication of first reference signal (RS) resources for a first transmission and reception point (TRP) and second RS resources for a second TRP, the first RS resources comprising a first plurality of beamformed RS and the second RS resource comprising a second plurality of beamformed RS to be received simultaneously at the UE, wherein the UE is further configured to select a first beam from the first plurality of beamformed RS and a second beam from the second plurality of beamformed RS and receives the at least one CSI measurement report comprising measurements for the first beam and the second beam.