Beam Indication via Segmented TCI States for 5G NR
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR, face challenges in optimizing beam indication for downlink reception, leading to inefficiencies in data transmission and reception due to complexities in configuring and managing Transmission Configuration Indication (TCI) states and spatial receiver parameters.
Innovation Solution
A method and user equipment (UE) implementation that receives configurations for multiple TCI states, activates specific states through Medium Access Control-Control Elements (MAC-CE), and transmits Hybrid Automatic Repeat Request-Acknowledgements (HARQ-ACK) based on spatial receiver parameters, allowing for efficient downlink control channel and shared channel reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TCI states are configured and activated for downlink reception, then beam indication precision and data transmission efficiency are improved, but device complexity and configuration management overhead increase
Solution Approach 1:
The patent segments TCI states into different types (first TCI states for PDCCH/PDSCH, second TCI states for PDSCH only) and uses separate configuration and activation mechanisms for each type. This segmentation allows the system to manage complex beam indications by dividing them into manageable, purpose-specific groups, reducing overall configuration complexity while maintaining high data transmission efficiency.
Solution Approach 2:
The patent implements preliminary configuration of multiple TCI states through RRC signaling before actual downlink reception. By pre-configuring and pre-activating TCI states via MAC-CE, the system prepares beam indication parameters in advance, enabling rapid and efficient data transmission without real-time configuration delays, thus improving productivity while managing complexity through advance preparation.
2Adaptability or versatility
If TCI states are configured for both PDCCH and PDSCH, then downlink reception flexibility is improved, but indication overhead and processing complexity increase
Solution Approach 1:
The patent divides TCI states into two distinct segments: first TCI states that apply to both PDCCH and PDSCH, and second TCI states that apply only to PDSCH. This segmentation enables flexible downlink reception by allowing different beam configurations for control and data channels while reducing indication overhead through dedicated, purpose-specific state assignments rather than redundant general configurations.
Solution Approach 2:
The first TCI states are designed with multi-functionality, serving both PDCCH and PDSCH reception needs. This universal approach allows a single TCI state configuration to handle multiple downlink channel types, improving adaptability while reducing overall indication overhead by eliminating the need for separate configurations for each channel type in all cases.
3Adaptability or versatility
If DCI scheduling information is used for PDSCH, then resource allocation flexibility is improved, but reliability decreases when scheduling information is invalid
Solution Approach 1:
The patent implements a feedback mechanism where the UE validates DCI scheduling information against the activated TCI states. When DCI indicates a TCI state that is not properly activated or configured, the UE can identify this mismatch and handle it appropriately, ensuring reliable PDSCH reception. This feedback loop maintains resource allocation flexibility while preventing reliability degradation through active validation and error detection.
Data Source
AI summary
A method and a user equipment for beam indication for DL reception are provided. The method includes: receiving a first configuration for configuring a plurality of first TCI states, each of the plurality of first TCI states applied for a PDCCH and a PDSCH; receiving a MAC-CE for activating one or more first TCI states from the plurality of first TCI states; receiving first DCI indicating one of the one or more first TCI states activated by the MAC-CE, the first DCI comprising one field for indicating scheduling information for a PDSCH, the indicated scheduling information being invalid for the PDSCH; transmitting a HARQ-ACK on a PUCCH resource determined by another one field in the first DCI when receiving the first DCI; and receiving the PDCCH and the PDSCH based on a spatial RX parameter derived according to the indicated first TCI state after transmitting the HARQ-ACK.