Msg3 Repetition Signaling for Reliable NR Random Access
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Solution Overview
Problem
The robustness of Msg3 transmission in the NR Rel17 contention-based access procedure is lower than other physical channels, leading to a higher likelihood of random access failure for terminal devices at the cell edge, increasing random access time.
Innovation Solution
Implementing Msg3 repetition based on configuration parameters determined by Msg3 repetition indication information received from a network device or transmitted to a terminal device, using system information blocks, random access responses, and downlink control information to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Msg3 is transmitted only once per scheduling in NR Rel15/16, then the transmission procedure is simple and fast, but the reliability of Msg3 transmission is low, especially for terminal devices at cell edge
Solution Approach 1:
The Msg3 transmission is segmented into multiple repetitions instead of a single transmission. The terminal device transmits Msg3 multiple times according to the repetition indication information, which divides the transmission task into several identical segments to improve reliability through redundancy
Solution Approach 2:
The network device performs preliminary action by sending Msg3 repetition indication information to the terminal device before the actual Msg3 transmission. This indication information includes configuration parameters that prepare the terminal device for the repeated transmission process, ensuring proper setup before execution
2Reliability
If Msg3 repetition is implemented, then the reliability of Msg3 transmission is improved, but the random access time increases due to multiple transmissions
Solution Approach 1:
The Msg3 repetition mechanism is dynamic rather than fixed. The network device configures the repetition parameter dynamically through indication information, allowing the system to adapt the number of repetitions based on actual channel conditions and terminal device requirements, optimizing the balance between reliability and time consumption
Solution Approach 2:
The repetition parameter is changed from a fixed value to a configurable parameter. By modifying the repetition parameter through indication information, the system can adjust the transmission strategy to achieve optimal performance under different conditions, reducing unnecessary repetitions when not needed
3Adaptability or versatility
If Msg3 repetition parameter is configured through indication information, then the adaptability of the system is improved, but the signaling overhead increases
Solution Approach 1:
The indication information mechanism serves multiple functions: it conveys the repetition parameter configuration, indicates the activation of repetition mode, and provides timing and resource allocation information. This multi-functionality reduces the need for separate signaling messages, optimizing the balance between adaptability and overhead
Data Source
AI summary
Embodiments of this application provide an Msg3 transmission method and apparatus, a device, and a storage medium. The method includes: receiving, by a terminal device, Msg3 repetition indication information transmitted by a network device, and determining a configuration parameter for Msg3 repetition; and performing Msg3 repetition according to the Msg3 repetition indication information.