Multi-TRP Uplink Beam Mapping With SRS-Based Power Control
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Solution Overview
Problem
Existing wireless communication technologies face challenges in clearly determining the relation between uplink TCI states and TRPs, managing multi-beams for UL signals, determining port and precoding information for PUSCH, and establishing a clear power control framework in multiple transmit/reception point (MTRP) scenarios, particularly in high-frequency bands with limited coverage.
Innovation Solution
A system and method for wireless communication devices to receive and determine SRS resources and transmission parameters based on beam states, using indications from wireless communication nodes, including DCI and MAC CE signaling, to manage uplink transmissions effectively in MTRP environments, involving unified TCI architectures and independent power control for each TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TCI states are configured for different TRPs, then uplink transmission reliability is improved, but device complexity increases due to multiple beam state management
Solution Approach 1:
The patent segments the TCI state management by associating each TCI state with a specific TRP through TRP-specific parameters (PCI, SSB index, CSI-RS resource index). This segmentation allows the UE to independently manage beam states for different TRPs, improving uplink transmission reliability through diverse beam configurations while reducing overall complexity through structured organization.
Solution Approach 2:
The patent introduces a new dimension of TRP identification by associating TCI states with TRP-specific parameters (physical cell ID, SSB index, CSI-RS resource index). This dimensional extension enables the system to distinguish and manage multiple beam states corresponding to different TRPs, thereby improving reliability without proportionally increasing management complexity.
2Adaptability or versatility
If independent power control is implemented for each TRP, then uplink transmission adaptability is improved, but signaling overhead increases
Solution Approach 1:
The patent segments power control parameters (P0, alpha, closed-loop index) by associating them with specific TRPs through TRP identifiers. This segmentation enables independent power control for each TRP, improving adaptability to different channel conditions while reducing signaling overhead through efficient parameter sharing and selective updating.
Solution Approach 2:
The patent establishes TRP-specific power control parameter configurations in advance through RRC signaling, preparing the power control framework before actual transmissions. This preliminary action enables rapid adaptive power control adjustments without requiring extensive real-time signaling, thus improving adaptability while controlling signaling overhead.
3Measurement precision
If SRS resources are associated with specific TCI states, then beam management precision is improved, but configuration complexity increases
Solution Approach 1:
The patent segments SRS resource configuration by associating each SRS resource with specific TCI states through SRS resource indicators. This segmentation enables precise beam management for different TRPs and transmission scenarios while reducing configuration complexity through structured association rules and efficient resource indexing.
4Reliability
If multiple beam states are managed for different TRPs, then communication reliability is improved, but information processing load increases
Solution Approach 1:
The patent segments beam state information by organizing TCI states with associated TRP identifiers and parameters. This segmentation enables the UE to efficiently process and manage multiple beam states for different TRPs independently, improving communication reliability through diverse beam selection while reducing information processing load through structured data organization and efficient access mechanisms.
Data Source
AI summary
Presented are systems, methods, apparatuses, or computer-readable media for communication in multiple transmission/reception point (TRP) environments. A wireless communication device may receive, from a wireless communication node, a configuration of at least one sounding reference signal (SRS) resource. The wireless communication device may receive, from the wireless communication node, an indication of at least one beam state. The wireless communication device may determine at least one first SRS resource according to the at least one beam state and the at least one SRS resource. The wireless communication device may determine a transmission parameter for an uplink transmission, according to the at least one first SRS resource.