Beam Switching Timing for Component Carrier Groups
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Solution Overview
Problem
Current 5G NR technology faces challenges in efficiently managing procedural delays and scheduling restrictions related to component carrier groups, particularly in switching beams for multiple component carriers (CCs) based on transmission configuration indications (TCI) states and pathloss reference signals (PL RS), which affects communication efficiency and reliability.
Innovation Solution
The proposed solution involves a method where user equipment (UE) and base stations coordinate beam switching for multiple CCs by receiving indications to change TCI states, spatial relations, or PL RS, with timing based on grouping of CCs, allowing for simultaneous or staggered switching depending on receive time differences (RTD) and TCI state knowledge, and scheduling communication accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam switching is performed for multiple component carriers simultaneously, then communication efficiency is improved, but procedural delays and scheduling restrictions increase due to unknown TCI states and receive time differences
Solution Approach 1:
The patent divides multiple component carriers into different groups based on their TCI state knowledge and receive time differences. CCs with known TCI states are switched simultaneously, while CCs with unknown TCI states are switched after a procedural delay. This segmentation resolves the contradiction by allowing simultaneous switching for efficient CCs while accommodating delays for CCs needing additional processing time.
Solution Approach 2:
The patent implements preliminary actions by determining TCI states and calculating receive time differences before beam switching. The base station provides TCI state indications in advance, and the UE prepares for switching by identifying which CCs have known versus unknown TCI states. This preliminary preparation enables optimized scheduling that accounts for procedural delays while maintaining efficiency where possible.
2Adaptability or versatility
If beam switching timing is optimized based on TCI state knowledge, then scheduling flexibility is improved, but system complexity increases due to need to track RTD and TCI state for each CC
Solution Approach 1:
The patent creates a universal beam switching framework that handles both known and unknown TCI states through a unified procedure. The base station provides TCI state indications that work across all component carriers, and the UE applies a standardized switching timeline that adapts to each CC's specific state. This multi-functional approach provides scheduling flexibility without requiring entirely separate mechanisms for different CC types.
Solution Approach 2:
The patent manages complexity by changing key parameters - specifically, the UE determines receive time differences and TCI state knowledge status for each CC group, and the base station adjusts scheduling timelines based on these parameter changes. Rather than complex real-time adjustments, the system uses parameter-based classification (known/unknown TCI state) that simplifies the switching decision process while maintaining flexibility.
3Speed
If simultaneous beam switching is performed for all CCs, then communication reliability may be compromised due to unknown TCI states, but switching speed is improved
Solution Approach 1:
The patent implements dynamic beam switching where the switching timing adapts to the specific TCI state knowledge of each component carrier group. CCs with known TCI states switch immediately at the scheduled time, while CCs with unknown TCI states switch after a procedural delay once the state is determined. This dynamic approach maintains high switching speed for reliable CCs while ensuring communication reliability for CCs needing additional verification time.
Data Source
AI summary
A configuration to enable a UE to switch beams of respective CCs based on certain factors (e.g., RTD or TCI states), and not switch the beams simultaneously. The apparatus receives, from a base station, a transmission including an indication to change at least one of a TCI state for multiple CCs, a spatial relation for the multiple CCs, or a PL RS for the multiple CCs. The apparatus switches beams in response to the transmission, where timing of the switching is based on a grouping of the multiple CCs.