Separate DL-UL Beam Indication for TCI State Activation
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, there is a need for improved signaling mechanisms to efficiently manage separate downlink and uplink transmission configuration indicator (TCI) states, especially in scenarios where downlink and uplink TRPs are not the same, leading to inefficiencies in uplink coverage and signaling.
Innovation Solution
A configuration for separate downlink/uplink beam indication is introduced, allowing UEs to apply downlink and uplink TCI states based on activation commands and conditions, enabling more efficient signaling for various deployment scenarios, including uplink dense configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate downlink and uplink TCI states are configured, then beam indication accuracy is improved, but signaling complexity increases
Solution Approach 1:
The patent segments the unified TCI state into separate downlink TCI states and uplink TCI states. This segmentation allows independent configuration and indication of downlink and uplink beam parameters, improving beam indication accuracy for each direction while managing signaling complexity through separate state definitions.
Solution Approach 2:
The patent introduces a new dimension by separating TCI states into distinct downlink and uplink dimensions. Instead of using a single unified TCI state that must accommodate both directions, the system now operates in two independent dimensional spaces, allowing optimized beam indication for each transmission direction.
2Loss of energy
If unified TCI state is used for both downlink and uplink, then signaling overhead is reduced, but uplink coverage performance deteriorates
Solution Approach 1:
The patent segments the previously unified TCI state into separate downlink and uplink TCI states. This allows the system to move from a single shared state to independent state configurations, improving uplink coverage performance through dedicated uplink beam parameters while managing signaling overhead through efficient separate state definitions.
Solution Approach 2:
The patent applies local quality by configuring specific TCI states optimized for uplink transmission characteristics. Instead of using a generic unified TCI state, the system now employs locally optimized uplink TCI states that are specifically tailored for uplink coverage requirements, including parameters like uplink beam power and spatial filters.
3Adaptability or versatility
If separate downlink and uplink TCI states are indicated, then beam management flexibility is improved, but processing complexity at UE increases
Solution Approach 1:
The patent segments beam management into separate downlink and uplink TCI state indications. This segmentation provides enhanced flexibility by allowing independent beam management for each direction, while the separate state definitions actually reduce UE processing complexity compared to managing a single unified state with multiple constraints.
Solution Approach 2:
The patent introduces dynamic beam management by enabling independent indication and application of downlink and uplink TCI states. The system can now dynamically adjust downlink and uplink beams independently based on channel conditions, improving adaptability while the standardized separate state structure keeps UE processing manageable.
Data Source
AI summary
Method and apparatus for separate downlink/uplink beam indication for separate downlink/uplink TCI states. The apparatus receives an activation command activating at least one of one or more downlink TCI states, or one or more uplink TCI states. The apparatus applies at least one of the one or more downlink TCI states or the one or more uplink TCI states based on the activation command and a condition for separate downlink/uplink unified TCI.