Communications Device MAC CE Mapping for Multi-TRP TCI Indication
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Solution Overview
Problem
The existing beam indication mechanism in PDSCH cannot effectively meet the requirements for indicating TCI information in multiple TRP scenarios and other communication scenarios due to the limitation of one-to-one mapping between TCI states and codepoints in DCI.
Innovation Solution
A method is introduced where the MAC CE command is enhanced to indicate a mapping relationship between TCI states and codepoints in DCI, allowing multiple TCI states or TCI state groups to be activated and mapped to a single codepoint, thereby supporting TCI information indication in multiple TRP 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 implementation is simple, but it cannot meet the requirement for indicating TCI information in multiple TRP scenarios
Solution Approach 1:
The patent segments the mapping relationship by introducing TCI state groups, where multiple TCI states are grouped together and mapped to a single codepoint. This segmentation allows the system to represent multiple TRP scenarios while maintaining a manageable structure for implementation.
Solution Approach 2:
The patent transitions from a one-to-one mapping (single dimension) to a many-to-one mapping by introducing the concept of TCI state groups (additional dimension). This dimensional change enables the system to indicate multiple TRP scenarios without proportionally increasing the number of codepoints.
2Adaptability or versatility
If multiple TCI states are mapped to a single codepoint, then the flexibility in indicating TCI information is improved, but the complexity of the mapping relationship increases
Solution Approach 1:
The patent makes the codepoint have multi-functionality by allowing a single codepoint to represent multiple TCI states through TCI state groups. This universal approach increases flexibility in indicating TCI information while avoiding the need for separate codepoints for each TCI state.
Solution Approach 2:
The patent introduces dynamic configuration where the mapping between codepoints and TCI states can be flexibly configured through MAC CE commands. This dynamic approach allows the system to adapt to different TRP scenarios without requiring a fixed complex mapping structure.
3Adaptability or versatility
If the MAC CE command includes detailed mapping information, then the flexibility and capability are improved, but the signaling overhead increases
Solution Approach 1:
The patent applies partial action by including only the necessary mapping information in the MAC CE command. Instead of providing complete mapping details for all TCI states, the command only specifies the activated TCI states and their corresponding codepoints, reducing signaling overhead while maintaining necessary capability.
Solution Approach 2:
The patent changes the parameter representation by using compact bitmaps and identifiers to indicate TCI state activation and mapping relationships. This parameter optimization reduces the amount of signaling data required while maintaining full functionality.
Data Source
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AI summary
Embodiments of this disclosure provide a method for transmitting indication information and a communications device. 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.