MAC CE Mapping of TCI States to DCI Codepoints
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Solution Overview
Problem
Existing wireless communication systems face limitations in communication capacity, speed, flexibility, and efficiency, particularly in configuring user equipment and base stations for optimal transmission and reception.
Innovation Solution
The implementation of user equipment and base station apparatuses with higher layer circuitry, medium access control circuitry, and reception/transmission circuitry to receive and transmit multiple transmission configuration indication states, allowing for flexible configuration of downlink control information on physical downlink control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TCI states are configured and mapped to DCI codepoints, then communication flexibility and efficiency are improved, but device complexity increases
Solution Approach 1:
The patent segments the TCI state configuration into multiple distinct MAC control elements (first MAC CE and second MAC CE), each handling different aspects of TCI state management. This segmentation allows the system to achieve enhanced flexibility through multiple TCI states while distributing the complexity across separate, manageable control structures rather than consolidating everything in a single complex mechanism.
Solution Approach 2:
The patent introduces MAC control elements as intermediary structures between the higher layer circuitry and the downlink control information. These MAC CEs serve as mediators that manage the mapping between TCI states and DCI codepoints, thereby improving communication flexibility while shielding the complexity of the mapping process from both the higher layers and the physical layer processing.
2Productivity
If multiple MAC control elements are used to select and map TCI states, then communication efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent designs the MAC control elements to serve multiple functions: they configure TCI states, manage codepoint mappings, and enable efficient downlink control information processing. By making the MAC CE structure multi-functional, the patent achieves improved communication efficiency through versatile control mechanisms while avoiding the need for separate signaling structures for each function, thereby controlling overhead.
3Adaptability or versatility
If TCI states are mapped to DCI codepoints through MAC CEs, then adaptability is improved, but processing complexity increases
Solution Approach 1:
The patent implements preliminary configuration of TCI states and their mappings to DCI codepoints through MAC control elements before actual downlink transmission occurs. This preliminary action allows the system to establish adaptable TCI state configurations in advance, enabling flexible adaptation to different communication scenarios while simplifying real-time processing since the mapping relationships are pre-established and stored in the user equipment.
Data Source
AI summary
The UE includes higher layer circuitry configured to receive information including more than one transmission configuration indication (TCI) states. The UE also includes medium access control (MAC) circuitry configured to receive a first MAC control element (CE) and a second MAC CE. The UE further includes reception circuitry configured to receive first downlink control information (DCI) on a physical downlink control channel (PDCCH), and second DCI on a PDCCH. The first MAC CE selects one of more TCI states from the more than one TCI states and maps the selected one or more TCI states to the codepoints of a TCI field in the second DCI. The second MAC CE selects one of more TCI states from the more than one TCI states and maps the selected one or more TCI states to the codepoints of the TCI field in the second DCI.