PUSCH TCI State Selection for Flexible Multi-TRP Uplink
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Solution Overview
Problem
Existing solutions for TCI state indication in 5G NR systems are limited to single transmission reception points (S-TRP) and lack flexibility in uplink transmission, particularly for PUSCH, which affects transmission efficiency.
Innovation Solution
A method for dynamically determining TCI states for PUSCH by sending first and second indication information to a terminal, allowing the terminal to determine a subset of TCI states based on transmission parameters, enhancing transmission flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single TCI state is indicated for PUSCH transmission, then the indication method is simple, but the transmission flexibility is insufficient
Solution Approach 1:
The patent segments the TCI state indication into two independent parts: first indication information for indicating multiple TCI states (n TCI states), and second indication information for selecting a subset of these states (m TCI states) based on PUSCH transmission parameters. This segmentation allows the system to maintain simplicity in each individual indication while achieving flexibility through their combination.
Solution Approach 2:
The patent introduces dynamic selection of TCI states by allowing the terminal to determine m TCI states from n indicated TCI states based on actual PUSCH transmission parameters. This dynamic mechanism enables the system to adapt to different transmission scenarios (single-TRP or multi-TRP) without requiring complex pre-configuration for each case.
2Adaptability or versatility
If multiple TCI states are indicated for PUSCH transmission, then the transmission flexibility is improved, but the indication complexity increases
Solution Approach 1:
The patent extracts the TCI state selection logic from the indication information itself by separating the indication of available TCI states (first indication information) from the selection of actual TCI states for transmission (second indication information based on PUSCH parameters). This extraction reduces indication complexity by allowing the terminal to autonomously determine the subset of TCI states based on transmission parameters.
Solution Approach 2:
The patent enables the terminal to self-determine which TCI states to use for PUSCH transmission by autonomously selecting m TCI states from the n indicated TCI states based on PUSCH transmission parameters. This self-service mechanism reduces the burden on the network device to explicitly indicate every TCI state selection, thereby reducing overall indication complexity.
3Productivity
If fixed TCI state indication is used, then the indication overhead is reduced, but the transmission efficiency decreases
Solution Approach 1:
The patent changes the parameter representation by using PUSCH transmission parameters (such as time domain parameters, frequency domain parameters, or spatial parameters) to dynamically determine which TCI states to apply. This parameter-based approach allows the system to convey rich transmission information without requiring explicit TCI state indications for every parameter change, thereby improving transmission efficiency while controlling indication overhead.
Data Source
AI summary
A method for transmission configuration indication (TCI) state indication comprising: receiving first indication information sent by a network device, where the first indication information is used for indicating n TCI states, the wherein n TCI states include at least one of joint TCI state(s) or uplink TCI state(s), and wherein n is a positive integer; receiving second indication information sent by the network device, wherein the second indication information is used for indicating transmission parameter(s) of a physical uplink shared channel (PUSCH); and determining m TCI states according to the second indication information, wherein the m TCI states are a subset of the n TCI states, and wherein m is a positive integer not greater than n.