PUSCH TCI State Association via Segmented DCI Fields
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Solution Overview
Problem
Existing communication systems, particularly in the context of 5G and beyond, face challenges in efficiently managing and switching between different Transmission Channel Instances (TCI) states for uplink channels, which affects communication performance and resource allocation.
Innovation Solution
The proposed solution involves a terminal apparatus and a base station apparatus that utilize specific configurations to receive and transmit PUSCH (Physical Uplink Shared Channel) data. The apparatuses are designed to interpret DCI (Downlink Control Information) indications that associate PUSCH transmissions with multiple TCI states, allowing for flexible association based on provided indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single TCI state is used for PUSCH transmission, then the device complexity is reduced, but the adaptability and communication performance deteriorate
Solution Approach 1:
The patent segments the TCI state indication into multiple independent fields within DCI format 0_1: a first TCI state indication field and a second TCI state indication field. Each field can independently indicate different TCI states, allowing the system to selectively use one or both fields based on communication requirements. This segmentation enables flexible association of PUSCH with multiple TCI states while maintaining clear, manageable indication mechanisms.
Solution Approach 2:
The patent introduces a new dimension for TCI state management by enabling simultaneous indication of multiple TCI states through separate fields in the DCI. Instead of using a single-dimensional indication approach, the system adds another indication dimension, allowing PUSCH to be associated with multiple TCI states (first TCI state from the first field, second TCI state from the second field) without increasing overall system complexity.
2Reliability
If multiple TCI states are indicated in DCI, then the communication performance is improved, but the loss of information increases due to more indication fields
Solution Approach 1:
The patent makes the second TCI state indication field optional and configurable, allowing the DCI format to serve multiple functions: it can indicate one or two TCI states depending on communication conditions. This multi-functionality enables the system to adapt the indication mechanism to different scenarios, reducing unnecessary information transmission when single TCI state sufficiency is adequate, while enabling enhanced reliability when multiple TCI states are required.
3Productivity
If dynamic TCI state switching is enabled, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The patent employs preliminary action by configuring TCI state indications in advance through RRC signaling, which pre-establishes the relationship between DCI fields and TCI states. This preliminary configuration reduces the processing burden during actual PUSCH transmission, as the terminal device can directly map the indicated TCI states to pre-configured parameters without complex real-time calculations, thereby improving resource allocation efficiency while controlling processing complexity.
Data Source
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AI summary
Included are a receiver configured to receive a first PDCCH to which a first DCI is mapped and a second PDCCH to which a second DCI for scheduling a PUSCH is mapped, and a transmitter configured to transmit the PUSCH, wherein the first DCI indicates both a first TCI state and a second TCI state, both the first TCI state and the second TCI state are TCI states for at least an uplink channel/signal, the second DCI provides any of a first indication, a second indication, and a third indication, in a case that the second DCI provides the first indication, the PUSCH is associated with the first TCI state, in a case that the second DCI provides the second indication, the PUSCH is associated with the second TCI state, and in a case that the second DCI provides the third indication, the PUSCH is associated with both the first TCI state and the second TCI state.