PRG Size Configuration for Multi-TRP PDSCH Decoding
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing control signaling for multi-Transmission and Reception Points (TRPs) operations, particularly in determining the Precoding Resource Block Group (PRG) size configuration, which affects the decoding of Physical Downlink Shared Channel (PDSCH) transmissions.
Innovation Solution
A User Equipment (UE) determines the PRG size based on downlink control information (DCI) messages, considering overlap and bundling attributes of physical resource blocks (PRBs) associated with different Transmission Configuration Indicator (TCI) states, and decodes PDSCH transmissions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRG size is determined dynamically for multi-TRP operations, then decoding accuracy of PDSCH transmissions is improved, but control signaling complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple PRG (Precoding Resource Block Group) sizes, allowing different PRG sizes to be applied to different frequency regions. This segmentation enables the UE to determine appropriate PRG sizes for different TRPs based on their respective TCI states, improving decoding accuracy without requiring a single complex control signaling mechanism to manage all scenarios
Solution Approach 2:
The patent introduces parameter changes by allowing the PRG size to vary dynamically based on the number of non-overlapping PRBs associated with different TCI states. The UE determines PRG size based on parameters such as the bundle type indicator and the count of non-overlapping PRBs, enabling adaptive adjustment that improves decoding while avoiding unnecessary control signaling complexity in stable scenarios
2Reliability
If multiple DCI messages are used for scheduling PDSCH from multiple TRPs, then reliability of transmission is improved, but resource overhead increases
Solution Approach 1:
The patent enables a single DCI message to serve multiple functions by allowing it to schedule PDSCH transmissions from multiple TRPs simultaneously. The DCI message includes a bundle type indicator that enables the UE to determine PRG sizes for multiple TRPs, making the single DCI message universal enough to handle multi-TRP scheduling without requiring separate messages for each TRP
Solution Approach 2:
The patent merges the scheduling function for multiple TRPs into a single DCI message structure. By combining the scheduling information and PRG size determination for multiple TRPs in one DCI message, the system reduces the quantity of control messages while maintaining the reliability benefits of multi-TRP transmission
3Productivity
If PRBs associated with different TCI states are bundled, then productivity of resource allocation is improved, but precision of PRG size determination is reduced
Solution Approach 1:
The patent introduces dynamics by allowing the PRG size to change based on the bundle type indicator and the number of non-overlapping PRBs. Instead of a static PRG size, the system dynamically adjusts PRG size based on the specific allocation scenario, enabling both efficient bundling and precise determination by adapting to each situation
Solution Approach 2:
The patent applies local quality by allowing different PRG sizes to be determined for different frequency regions based on local PRB allocation patterns. The UE determines PRG size locally for each set of non-overlapping PRBs associated with different TCI states, rather than applying a uniform PRG size across all resources, thus maintaining precision where needed while enabling bundling efficiency where applicable
Data Source
AI summary
Wireless communication systems can include multiple Transmission and Reception Points (TRPs). Systems, devices, and techniques for control signaling of Precoding Resource block Group (PRG) size configuration for multi-TRP operations are described. A described technique includes determining, by a User Equipment (UE), a PRG size based on a downlink control information (DCI) message that provides scheduling information for a physical downlink shared channel (PDSCH); receiving, by the UE, a group of PDSCH transmissions from multiple TRPs that are transmitted in accordance with the DCI message; and decoding, by the UE, one or more of the PDSCH transmissions based on the PRG size.