Beam Determination Prior to Activation in 5G NR
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and NR technologies, face challenges in efficiently determining and utilizing optimal beams for downlink transmissions before an activated beam indication, leading to potential interference and reduced spectral efficiency.
Innovation Solution
The method involves a user equipment (UE) and base station determining a beam for downlink transmission prior to receiving an indication of an activated transmission configuration indicator (TCI) state, using a configuration and downlink control information that schedules a transmission after a time offset, allowing for beam selection based on quasi-co-location assumptions and threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam determination is performed before TCI state activation indication, then spectral efficiency is improved and interference is reduced, but the complexity of beam management increases
Solution Approach 1:
The base station determines the optimal beam for downlink transmission before transmitting the TCI state activation indication to the UE. This preliminary beam determination allows the system to prepare the transmission beam in advance, improving spectral efficiency by ensuring the best beam is used from the start, while the complexity is managed through automated base station processing
Solution Approach 2:
The beam determination process is made dynamic by allowing the base station to select from multiple configured TCI states based on current channel conditions, UE location, and transmission requirements. This dynamic selection optimizes performance adaptively while maintaining manageable complexity through algorithmic decision-making
2Reliability
If beam determination is performed before TCI state activation indication, then communication performance is enhanced, but the time offset for transmission scheduling increases
Solution Approach 1:
The base station performs beam determination in advance during the time offset period, utilizing this interval productively to analyze channel conditions and select the optimal beam. This transforms the previously idle time into a useful preparation phase, enhancing communication performance without effectively increasing the time loss
Solution Approach 2:
The beam determination process continues seamlessly during the time offset period, maintaining continuous useful action rather than leaving the time gap idle. The base station continuously monitors conditions and prepares the optimal beam configuration, ensuring no valuable time is wasted while improving overall system performance
Data Source
AI summary
Various aspects of the present disclosure generally relate to systems, apparatuses, and methods for beam determination prior to an indication of an activated beam. A user equipment may receive a configuration for one or more transmission configuration indicator (TCI) states; receive downlink control information that schedules a downlink transmission after a time offset; determine, prior to receiving an indication of an activated TCI state of the one or more TCI states, a beam for receiving the downlink transmission; and receive the downlink transmission using the beam. Numerous other aspects are provided.