5G NR Configuration Activation via Single DCI
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Solution Overview
Problem
In 5G NR systems, activating multiple transmission configurations in the uplink grant-free retransmission scheme results in high latency and large overhead due to insufficient PDCCH resources, leading to reduced reliability and efficiency in data transmission.
Innovation Solution
A method for transmitting activation/deactivation information to terminals, using a first field to indicate activation/deactivation of multiple transmission configurations, allowing for simultaneous activation of multiple configurations using a single piece of information, thereby reducing overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission configurations are activated individually through separate DCI, then each configuration can be activated reliably, but the overhead of PDCCH increases and latency increases due to insufficient PDCCH resources
Solution Approach 1:
The patent combines multiple configuration activation indicators into a single DCI message. Specifically, multiple Transmission Configuration Indication (TCI) states are merged into one DCI format, allowing the terminal to activate multiple transmission configurations simultaneously through a single downlink control information message, thereby reducing PDCCH overhead and activation latency while maintaining reliable activation
Solution Approach 2:
The DCI structure is designed to serve multiple functions: it can indicate a single TCI state for one configuration or multiple TCI states for multiple configurations, depending on the configuration mode. This multi-functional DCI design allows the system to adapt between different activation scenarios without requiring separate specialized messages, reducing overall control overhead
2Reliability
If multiple transmission configurations are activated individually through separate DCI, then each configuration can be activated accurately, but the PDCCH overhead becomes large
Solution Approach 1:
Multiple TCI state indicators are merged into a single DCI message. The patent uses a unified DCI structure that can carry multiple TCI state values, thereby consolidating what would otherwise require multiple separate DCI messages into one, significantly reducing PDCCH resource consumption and overhead while preserving accurate configuration activation
Solution Approach 2:
The DCI message is segmented into multiple fields, each carrying TCI state information for different configurations. This segmentation allows the single DCI to efficiently encode multiple configuration activations by dividing the information into manageable parts (e.g., first TCI state field, second TCI state field, third TCI state field), reducing overall overhead while maintaining accuracy
Data Source
AI summary
This disclosure provides a configuration activation/deactivation method, a network device, and a terminal. The method includes: transmitting, to a terminal, activation/deactivation information for indicating activation/deactivation of multiple transmission configurations; wherein, the multiple transmission configurations are associated with configuration information of the activation/deactivation information, or a first field of the activation/deactivation information is used for indicating activation/deactivation of first configuration information that is same among the multiple transmission configurations.