Multi-TRP Beam Management Through DMRS Port-Group Segmentation
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Solution Overview
Problem
Existing wireless communication technologies, particularly in multi-TRP scenarios, face challenges in determining optimal reception beams due to limitations in channel state information reference signal configurations, which hinder effective beam management and performance.
Innovation Solution
The proposed solution involves providing a user equipment with a CSI-RS resource configuration that includes multiple DMRS-port-groups associated with different TRPs, along with control signaling for quasi-colocation and DMRS-port-group indications, enabling the UE to determine preferred reception beams and spatial reception parameters for improved beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI-RS resource configuration includes multiple DMRS-port-groups for different TRPs, then beam management performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the CSI-RS resource configuration by associating different CSI-RS resources with different DMRS-port-groups, where each port-group corresponds to a specific TRP. This segmentation allows the UE to independently measure and determine reception beams for each TRP, improving beam management performance while maintaining manageable configuration complexity through structured organization.
Solution Approach 2:
The patent introduces a new dimension to beam management by supporting multiple transmission hypotheses simultaneously through multi-TRP configurations. Instead of single-TRP single-hypothesis management, the system evaluates multiple TRPs and their corresponding transmission hypotheses in parallel, enabling the UE to select optimal reception beams from multiple spatial dimensions.
2Measurement precision
If multiple transmission hypotheses are evaluated, then reception beam selection accuracy is improved, but measurement and processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CSI-RS resources and their associations with DMRS-port-groups before actual beam measurement. The network provides the UE with predefined CSI-RS resource configurations that include port-group indications, allowing the UE to perform measurements more efficiently without real-time configuration overhead, thus reducing processing time while maintaining high measurement precision.
Solution Approach 2:
The patent changes key parameters of the CSI-RS configuration, specifically introducing dmrs-port-group-ID and tci-State associations. These parameter changes enable the system to efficiently manage multiple transmission hypotheses by linking CSI-RS resources to specific port-groups and TCI states, allowing rapid evaluation of multiple hypotheses without proportionally increasing measurement time.
3Measurement precision
If control signaling includes QCL information and DMRS-port-group indications, then spatial reception parameter accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies universality by making the TCI state configuration multi-functional. The TCI state not only indicates spatial reception parameters but also associates with DMRS-port-groups and CSI-RS resources simultaneously. This multi-functionality allows a single control signaling element to convey multiple pieces of information (QCL information, port-group indication, resource association), improving spatial parameter accuracy while minimizing signaling overhead through consolidated information delivery.
Data Source
AI summary
Apparatus, methods, processing systems, and computer readable mediums for beam management in multi-TRP scenarios are disclosed. An exemplary method generally includes receiving a channel state information reference signal (CSI-RS) resource configuration from at least one base station (BS) for one or more transmission hypotheses, wherein the CSI-RS resource configuration includes CSI-RS resources corresponding to at least a first downlink (DL) demodulation reference signal (DMRS)-port-group and a second DL DMRS-port-group, performing one or more CSI-RS measurements for the one or more transmission hypotheses based, at least in part on the CSI-RS resource configuration, and determining, for each of the one or more transmission hypotheses, a preferred reception beam for communicating with the at least one BS based, at least in part, on the one or more CSI-RS measurements.