Precoding Configuration Timer for 5G Grant-Free Transmission
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Solution Overview
Problem
In 5G NR communications, the precoding configuration for grant-free transmission is sensitive to channel changes, leading to severe system performance loss if not adapted promptly.
Innovation Solution
Implementing a method where the use duration of precoding configurations is limited by a timer, allowing for flexible and variable precoding configurations, and traversing multiple configurations based on frequency or time-domain resource units to determine the best configuration for each unit, ensuring adaptability to channel changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a same precoding configuration is kept being used in the validity period of the grant-free transmission resource, then the configuration is simple to implement, but severe system performance loss is caused due to channel changes
Solution Approach 1:
The patent applies dynamics by making the precoding configuration adaptable to channel changes through timer-based validity periods. The precoding configuration is no longer static but dynamically adjusted based on channel conditions, allowing the system to switch between using the same configuration (when stable) and adapting to changes (when channel varies), thus resolving the contradiction between implementation simplicity and system performance reliability
Solution Approach 2:
The patent changes the parameter of precoding configuration validity by introducing a timer mechanism with configurable duration. This allows the system to control how long a precoding configuration remains valid before reevaluation, enabling flexible adaptation to channel changes while maintaining stability during valid periods, thereby improving system performance without excessive complexity
2Reliability
If a precoding configuration is made flexible and variable to adapt to channel changes, then system performance is improved, but the complexity of configuration management increases
Solution Approach 1:
The patent segments the precoding configuration management into discrete timer-based validity periods. Instead of continuously monitoring and adjusting precoding configurations, the system divides time into segments where each segment uses a stable configuration, reducing the complexity of continuous management while maintaining adaptability through periodic reevaluation at timer expiration
Solution Approach 2:
The patent implements periodic action through timer-based validity periods for precoding configurations. The system periodically reevaluates and updates precoding configurations at predetermined intervals rather than continuously, which maintains system performance adaptability while significantly reducing the complexity of configuration management compared to continuous adjustment
Data Source
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AI summary
Embodiments of this application provide an information transmission method and a device. The method includes: receiving at least one precoding configuration from an access network device; starting a timer; and sending uplink information to the access network device on a configured grant-free time-frequency resource in valid duration of the timer by using the at least one precoding configuration. According to the embodiments of this application, inadaptation of a precoding configuration caused by a channel change can be effectively avoided, thereby improving system performance.