MAC CE TCI Grouping for Flexible Multi-TRP Beam Indication
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Solution Overview
Problem
Existing beam indication mechanisms in wireless communications systems, such as those using RRC signaling and MAC CE commands, are limited to one-to-one mapping between TCI states and codepoints in DCI, failing to meet the requirements for multiple transmission reception point (TRP) scenarios and other complex communication scenarios.
Innovation Solution
A method and device that utilize a MAC CE command to activate N first objects, including TCI states in M TCI state groups and N−M individual TCI states, allowing for a flexible mapping relationship between TCI states and codepoints in DCI, enabling support for multiple TRP scenarios and other communication scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a one-to-one mapping between TCI states and codepoints is used, then the MAC CE command structure is simple, but it cannot meet the requirements for multiple TRP scenarios and other complex communication scenarios
Solution Approach 1:
The patent divides TCI states into multiple groups (first TCI state group, second TCI state group, etc.) and uses separate MAC CE commands for each group. This segmentation allows the system to handle multiple TRP scenarios by treating different TCI state groups independently, thereby improving adaptability while keeping each individual MAC CE command structure relatively simple.
Solution Approach 2:
The patent introduces a new dimension of organization by grouping TCI states into multiple groups rather than using a flat one-to-one mapping. This dimensional change from individual state-codepoint pairs to grouped states enables support for multiple TRP scenarios while maintaining manageable command structures through hierarchical organization.
2Adaptability or versatility
If multiple TCI state groups are activated to support complex scenarios, then adaptability improves, but signaling overhead increases
Solution Approach 1:
By segmenting TCI states into groups and using separate MAC CE commands for each group, the patent enables efficient signaling. Each MAC CE command can be optimized for its specific group, avoiding the need to transmit information about all TCI states in every command, thereby reducing overall signaling overhead while maintaining support for diverse scenarios.
Solution Approach 2:
The patent performs preliminary organization of TCI states into groups before activation. This preliminary action allows the network to pre-configure logical groupings based on scenario requirements, so that subsequent activation commands only need to indicate which groups to activate rather than detailing individual state mappings, reducing signaling overhead.
3Adaptability or versatility
If individual TCI states are activated separately, then mapping flexibility improves, but command length variability increases
Solution Approach 1:
The patent segments the activation process into group-level commands and state-level indicators. Each MAC CE command handles a specific TCI state group with a standardized structure, while individual state activation within groups follows consistent patterns. This segmentation reduces command length variability compared to completely variable individual state activation.
Solution Approach 2:
The patent changes the parameter organization from individual state identifiers to group-based identifiers with state offsets or indices. This parameter transformation allows for more predictable command length structures while maintaining the flexibility to activate individual states within groups, as the group-level parameter provides a base reference that reduces the information needed for individual state specification.
Data Source
AI summary
A method for transmitting indication information and a communications device are provided. The method includes: performing transmission of a medium access control control element MAC CE command, where the MAC CE command is used to instruct to activate N first objects and indicate a mapping relationship between the first objects and codepoints of a transmission configuration indicator field TCI field in downlink control information DCI, the N first objects include transmission configuration indicator states TCI state in M TCI state groups and N−M TCI states, N is a positive integer, and M is an integer less than or equal to N.