Physical Layer Beam Indication Using TCI States for Fast Beam Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beamforming and beam indication processes, particularly in 5G/NR systems, which affect data transmission efficiency and reliability due to hardware constraints and the need for improved beam management.
Innovation Solution
Implementing a system that utilizes L1-based beam indications through transmission configuration indicator (TCI) states for both downlink and uplink channels, allowing for dynamic adjustment of spatial filters based on acknowledged TCI state IDs, enabling efficient beam management and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming gain is implemented using massive antenna technologies, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments beam management into distinct phases (initial access, beam refinement, beam maintenance) and separates downlink and uplink beam indications. TCI states are divided into different types (DL TCI, UL TCI, joint TCI) for different channel scenarios, allowing complex beamforming to be managed through modular, organized components rather than monolithic complexity
Solution Approach 2:
The patent establishes beam indications and TCI states in advance through RRC configuration and MAC CE activation before actual data transmission. Spatial filters are pre-configured and activated, allowing the system to prepare beamforming parameters beforehand, reducing real-time processing complexity while maintaining high transmission efficiency
2Reliability
If dynamic beam adjustment is implemented to adapt to changing environmental conditions, then reliability is improved, but processing time increases
Solution Approach 1:
Multiple TCI states are pre-configured through RRC signaling and activated via MAC CE before transmission. The system prepares multiple spatial filter options in advance, allowing rapid switching between beams based on channel conditions without requiring time-consuming real-time calculations, thus improving reliability while minimizing processing time
Solution Approach 2:
The patent implements feedback mechanisms where UEs report channel quality and beam measurement results to the network. Based on this feedback, the network dynamically adjusts TCI states and spatial filters. This closed-loop feedback enables adaptive beam management that maintains reliability while optimizing processing time through informed decision-making
3Adaptability or versatility
If separate TCI states are configured for downlink and uplink channels, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent introduces joint TCI states that can simultaneously indicate spatial filters for both downlink and uplink channels. This universal TCI mechanism allows a single configuration to serve multiple purposes (DL and UL beam indication), reducing the need for separate complex configurations while maintaining adaptability across different channel types and scenarios
Data Source
AI summary
Methods and apparatuses for physical layer beam indications. A method for operating a user equipment (UE) includes receiving one or more first transmission configuration indicator (TCI) states for reception and transmission of downlink (DL) channels and uplink (UL) channels, respectively; receiving one or more TCI state identifiers (IDs); and transmitting an acknowledgement in response to the reception of the one or more TCI state IDs. The method further includes, based on the acknowledgement: determining, based on the one or more TCI state IDs, one or more second TCI states; determining a time to apply the one or more second TCI states; and updating one or more spatial filters based on the one or more second TCI states. The method further includes receiving and transmitting data on the DL channel and UL channels, respectively, using the one or more spatial filters starting at the determined time.