Two-Step Random Access Retransmission Configuration
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Solution Overview
Problem
In the 5G NR system, the two-step random access process is inefficient due to the need for complete retransmission of the random access message when the base station fails to parse the content in the PUSCH, leading to resource wastage and poor resource utilization.
Innovation Solution
Implementing different retransmission configurations for the first random access message and its content in the PUSCH, with adjustable transmitting power to optimize the transmission process and improve success rates, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete retransmission of the random access message is performed when the base station fails to parse the PUSCH content, then the transmission reliability is improved, but the resource utilization deteriorates
Solution Approach 1:
The patent segments the random access message into two independent parts: PRACH (Physical Random Access Channel) and PUSCH (Physical Uplink Shared Channel). When the base station fails to parse the PUSCH content, only the PUSCH part is retransmitted while the PRACH part is not retransmitted. This segmentation allows selective retransmission of only the failed component, improving resource utilization while maintaining transmission reliability.
2Reliability
If complete retransmission of the random access message is performed, then the success rate of random access is improved, but the transmission efficiency deteriorates
Solution Approach 1:
By segmenting the message into PRACH and PUSCH components, the patent enables selective retransmission. When PUSCH parsing fails, only PUSCH is retransmitted with a different configuration, avoiding redundant retransmission of successfully received PRACH content. This improves transmission efficiency while maintaining the success rate.
Solution Approach 2:
The patent applies dynamic retransmission strategies where the retransmission configuration is adjusted based on the specific failure condition. Different retransmission configurations are used for PRACH and PUSCH, and the base station can selectively request retransmission of only the failed component, making the system adaptive and efficient.
3Loss of energy
If different retransmission configurations are used for PRACH and PUSCH, then the resource utilization is improved, but the system complexity increases
Solution Approach 1:
The patent manages system complexity by segmenting the message and applying different retransmission configurations to each segment. The base station maintains separate configuration parameters for PRACH and PUSCH retransmissions, allowing independent optimization of each component's resource usage while keeping the overall system manageable through modular configuration.
Data Source
AI summary
A method and a device for sending a random access message in a wireless communication network includes: sending a first random access message based on a first retransmission configuration in a two-step random access process, in which the first random access message includes a physical random access channel (PRACH) and a physical uplink shared channel (PUSCH); and sending specified content based on a second retransmission configuration in response to meeting a condition of sending the specified content, in which the specified content is content of the first random access message in the PUSCH; the first retransmission configuration being different from the second retransmission configuration.