Uplink Beam State Application Timing in 5G NR Carrier Aggregation
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Solution Overview
Problem
In 5G NR systems, determining the optimal time to apply beam states for uplink transmissions in multi-carrier aggregation scenarios is challenging due to varying subcarrier spacings and transmission configurations, leading to inefficiencies in beam management and coverage, especially in high-frequency bands where signal decay is rapid.
Innovation Solution
A system and method where a wireless communication device determines the application time for beam states based on reference times, time offsets, and subcarrier spacings, allowing for coordinated application across multiple component carriers, ensuring consistent beam state transitions and improved coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If beam states are applied immediately upon reception in multi-carrier aggregation, then beam management responsiveness is improved, but transmission coverage and signal stability deteriorate due to varying subcarrier spacings and processing time requirements
Solution Approach 1:
The patent applies preliminary action by introducing a time offset period between receiving the beam state indication and actually applying it to uplink transmissions. This offset allows the wireless communication device to properly process the beam state information and prepare for subsequent transmissions, ensuring both timely response and stable coverage across different subcarrier spacings in carrier aggregation scenarios
2Reliability
If beam state application time is extended to ensure processing accuracy, then transmission reliability is improved, but system efficiency and throughput deteriorate due to delayed beam switching
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the time offset based on subcarrier spacing configurations. Different subcarrier spacings require different processing times, so the system modifies the application timing parameter to match the specific configuration being used. This allows accurate beam state application while minimizing overall delay to the extent possible given the variability in processing requirements
3Device complexity
If uniform beam state application timing is used across all component carriers, then system complexity is reduced, but coverage consistency deteriorates due to varying subcarrier spacing requirements
Solution Approach 1:
The patent applies local quality by allowing different time offset values for different component carriers and subcarrier spacing configurations. Instead of using a single uniform timing rule for all carriers, the system selects appropriate time offsets based on the specific subcarrier spacing and carrier characteristics, ensuring consistent and reliable beam state application across heterogeneous carrier configurations
Data Source
AI summary
Presented are systems, methods, apparatuses, or computer-readable media for determining times for applying beam states for uplink transmissions. A wireless communication device may receive, from a wireless communication node, a first downlink control information (DCI) indicating a beam state. The wireless communication device may determine to apply the beam state to at least one target transmission after or starting from a first application time.