User Terminal MAC CE Segmentation for TCI State Control
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Solution Overview
Problem
In future radio communication systems like NR and 5G, user terminals struggle to properly control receiving processes for downlink control channels when configured with multiple CORESETs due to improper specification of TCI states using MAC CEs.
Innovation Solution
The solution involves configuring MAC CEs with specific fields that correspond to each CORESET, allowing the user terminal to identify and control the TCI states for each CORESET, ensuring proper reception of downlink control channels by including fields that show the quasi-co-location (QCL) information between the PDCCH or PDSCH and DL-RSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCI states are not specified properly using MAC CEs for multiple CORESETs, then the system complexity is reduced, but the user terminal cannot properly control receiving processes for downlink control channels
Solution Approach 1:
The MAC CE is segmented into multiple fields, with each field corresponding to a specific CORESET. This segmentation allows the user terminal to properly control receiving processes for downlink control channels on a per-CORESET basis, resolving the reliability issue while maintaining manageable complexity through structured organization.
Solution Approach 2:
Each field in the MAC CE is configured with local quality specific to its corresponding CORESET, including TCI state information and QCL relationships. This localized configuration enables precise control of receiving processes for each CORESET without requiring complex global configuration, balancing reliability with device complexity.
2Reliability
If MAC CEs are configured with fields for each CORESET to specify TCI states, then the user terminal can properly control receiving processes, but the MAC CE structure becomes more complex
Solution Approach 1:
The MAC CE is divided into multiple fields, with each field corresponding to a specific CORESET. This segmentation allows for proper specification of TCI states and QCL information on a per-CORESET basis, ensuring reliable downlink control channel reception while organizing the complexity into manageable, structured units.
Solution Approach 2:
The MAC CE structure is designed with multi-functionality, where each field can universally handle TCI state specification and QCL information for its corresponding CORESET. This universal approach allows the same MAC CE structure to serve multiple CORESETs with different configurations, reducing overall system complexity while maintaining reliability.
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3B
AI summary
According to the present disclosure, a user terminal has a receiving section that receives a MAC (Medium Access Control) control element, which includes one or more fields that respectively correspond to one or more control resource sets, and a control section that controls receipt of a downlink control channel, which is mapped to a given resource unit in the control resource sets, based on transmission configuration indicator (TCI) states of the control resource sets, shown in the fields.