Spatially QCL Reference Signal Configuration for Multi-Panel Uplink
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Solution Overview
Problem
Conventional technology is unable to configure suitable beams for multiple antenna panels in user equipment (UE) lacking beam correspondence, limiting the use of multiple antenna panels for improved performance in uplink transmissions.
Innovation Solution
Configuring spatially Quasi Co-Located (QCL) reference signal resources for each antenna panel, allowing the network node to select and inform the UE about the best reference signal resources for transmission, enabling the UE to update its configuration for optimal beam usage across all panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional technology is used to configure reference signal resources, then the configuration process is simple, but multiple antenna panels cannot be properly configured for UEs lacking beam correspondence
Solution Approach 1:
The patent segments the reference signal resource configuration by creating separate resource sets for each antenna panel. Each panel is assigned its own SRS resource set with panel-specific spatial QCL parameters, allowing independent configuration and optimization of each panel's beamforming resources while maintaining overall system coordination.
Solution Approach 2:
The patent introduces a new dimension to the configuration by adding panel-specific spatial QCL parameter sets. This extends the traditional single-dimension resource configuration into a multi-dimensional structure that accounts for panel identity, spatial relationships, and QCL parameters, enabling comprehensive support for multiple panels without overwhelming complexity.
2Reliability
If beam correspondence is assumed, then configuration is simplified, but UEs without beam correspondence cannot achieve optimal performance
Solution Approach 1:
The patent applies local quality by configuring spatial QCL parameters specifically for each antenna panel's local conditions. Each panel receives customized spatial QCL parameter sets that reflect its specific spatial relationships and beamforming characteristics, rather than applying a uniform configuration across all panels. This enables accurate beam configuration for each panel while maintaining manageable overall complexity.
3Measurement precision
If spatial QCL parameters are configured for each panel, then beam selection accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring spatial QCL parameter sets for each antenna panel before actual beamforming operations. These parameter sets are established in advance and stored in the UE, allowing rapid beam assessment and selection during operation without requiring extensive real-time signaling. This reduces signaling overhead while maintaining high measurement precision.
Data Source
AI summary
Spatially Quasi Co-Located (QCL) reference signal resources are configured in a wireless communication device having a plurality of antenna panels. Information indicating a number of antenna panels in the wireless communication device is obtained, and a corresponding number of reference signal resource sets is selected that are to be used in a reference signal resource selection process, wherein each reference signal resource set includes identities of one or more reference signal resources to be used by the wireless communication device when transmitting a sounding reference signal. The wireless communication device is informed about which reference signal resource sets have been selected. From each of the antenna panels, the sounding reference signal is received on each one of a plurality of transmissions, each performed by the antenna panel using a different one of the reference signal resources of the reference signal resource set selected for the antenna panel. For each reference signal resource set, the received transmissions from the antenna panels are assessed, and a best transmission is selected therefrom based on predefined transmission selection criteria, and for each best transmission a corresponding reference signal resource is selected that was used in performance of the best transmission. Information indicating the selected reference signal resources is sent in one higher layer data structure. The wireless communication device used this information to update a sounding reference signal resource set this is to be used for subsequent transceiver operations.